diff --git a/.eslintignore b/.eslintignore
index c9e1fb45a4a2..834daf99c050 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -222,9 +222,6 @@ mobile/android/tests/browser/chrome/tp5/
 mobile/android/app/mobile.js
 mobile/android/app/geckoview-prefs.js
 
-# Uses `#expand`
-mobile/android/chrome/content/about.js
-
 # Not much JS to lint and non-standard at that
 mobile/android/installer/
 mobile/android/locales/
diff --git a/mobile/android/chrome/content/.eslintrc.js b/mobile/android/chrome/content/.eslintrc.js
deleted file mode 100644
index 39df19f8a9c8..000000000000
--- a/mobile/android/chrome/content/.eslintrc.js
+++ /dev/null
@@ -1,12 +0,0 @@
-"use strict";
-
-module.exports = {
-  "rules": {
-    "complexity": ["error", 20],
-
-    // Disabled stuff
-    "no-console": 0, // TODO: Can we use console?
-    "no-cond-assign": 0,
-    "no-fallthrough": 0,
-  }
-};
diff --git a/mobile/android/chrome/content/CastingApps.js b/mobile/android/chrome/content/CastingApps.js
deleted file mode 100644
index 1fde2530d97e..000000000000
--- a/mobile/android/chrome/content/CastingApps.js
+++ /dev/null
@@ -1,857 +0,0 @@
-// -*- Mode: js; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "PageActions",
-  "resource://gre/modules/PageActions.jsm"
-);
-
-// Define service devices. We should consider moving these to their respective
-// JSM files, but we left them here to allow for better lazy JSM loading.
-var rokuDevice = {
-  id: "roku:ecp",
-  target: "roku:ecp",
-  factory: function(aService) {
-    const { RokuApp } = ChromeUtils.import(
-      "resource://gre/modules/RokuApp.jsm"
-    );
-    return new RokuApp(aService);
-  },
-  types: ["video/mp4"],
-  extensions: ["mp4"],
-};
-
-var mediaPlayerDevice = {
-  id: "media:router",
-  target: "media:router",
-  factory: function(aService) {
-    const { MediaPlayerApp } = ChromeUtils.import(
-      "resource://gre/modules/MediaPlayerApp.jsm"
-    );
-    return new MediaPlayerApp(aService);
-  },
-  types: ["video/mp4", "video/webm", "application/x-mpegurl"],
-  extensions: ["mp4", "webm", "m3u", "m3u8"],
-  init: function() {
-    GlobalEventDispatcher.registerListener(this, [
-      "MediaPlayer:Added",
-      "MediaPlayer:Changed",
-      "MediaPlayer:Removed",
-    ]);
-  },
-  onEvent: function(event, data, callback) {
-    if (event === "MediaPlayer:Added") {
-      let service = this.toService(data);
-      SimpleServiceDiscovery.addService(service);
-    } else if (event === "MediaPlayer:Changed") {
-      let service = this.toService(data);
-      SimpleServiceDiscovery.updateService(service);
-    } else if (event === "MediaPlayer:Removed") {
-      SimpleServiceDiscovery.removeService(data.id);
-    }
-  },
-  toService: function(display) {
-    // Convert the native data into something matching what is created in _processService()
-    return {
-      location: display.location,
-      target: "media:router",
-      friendlyName: display.friendlyName,
-      uuid: display.uuid,
-      manufacturer: display.manufacturer,
-      modelName: display.modelName,
-    };
-  },
-};
-
-var CastingApps = {
-  _castMenuId: -1,
-  _blocked: null,
-  _bound: null,
-  _interval: 120 * 1000, // 120 seconds
-
-  init: function ca_init() {
-    if (!this.isCastingEnabled()) {
-      return;
-    }
-
-    // Register targets
-    SimpleServiceDiscovery.registerDevice(rokuDevice);
-
-    // MediaPlayerDevice will notify us any time the native device list changes.
-    mediaPlayerDevice.init();
-    SimpleServiceDiscovery.registerDevice(mediaPlayerDevice);
-
-    // Search for devices continuously
-    SimpleServiceDiscovery.search(this._interval);
-
-    this._castMenuId = NativeWindow.contextmenus.add(
-      Strings.browser.GetStringFromName("contextmenu.sendToDevice"),
-      this.filterCast,
-      this.handleContextMenu.bind(this)
-    );
-
-    GlobalEventDispatcher.registerListener(this, [
-      "Casting:Play",
-      "Casting:Pause",
-      "Casting:Stop",
-    ]);
-
-    Services.obs.addObserver(this, "ssdp-service-found");
-    Services.obs.addObserver(this, "ssdp-service-lost");
-    Services.obs.addObserver(this, "application-background");
-    Services.obs.addObserver(this, "application-foreground");
-
-    BrowserApp.deck.addEventListener("TabSelect", this, true);
-    BrowserApp.deck.addEventListener("pageshow", this, true);
-    BrowserApp.deck.addEventListener("playing", this, true);
-    BrowserApp.deck.addEventListener("ended", this, true);
-    BrowserApp.deck.addEventListener("MozAutoplayMediaBlocked", this, true);
-    // Note that the XBL binding is untrusted
-    BrowserApp.deck.addEventListener(
-      "MozNoControlsVideoBindingAttached",
-      this,
-      true,
-      true
-    );
-  },
-
-  _mirrorStarted: function(stopMirrorCallback) {
-    this.stopMirrorCallback = stopMirrorCallback;
-    NativeWindow.menu.update(this.mirrorStartMenuId, { visible: false });
-    NativeWindow.menu.update(this.mirrorStopMenuId, { visible: true });
-  },
-
-  serviceAdded: function(aService) {},
-
-  serviceLost: function(aService) {},
-
-  isCastingEnabled: function isCastingEnabled() {
-    return Services.prefs.getBoolPref("browser.casting.enabled");
-  },
-
-  onEvent: function(event, message, callback) {
-    switch (event) {
-      case "Casting:Play":
-        if (this.session && this.session.remoteMedia.status == "paused") {
-          this.session.remoteMedia.play();
-        }
-        break;
-      case "Casting:Pause":
-        if (this.session && this.session.remoteMedia.status == "started") {
-          this.session.remoteMedia.pause();
-        }
-        break;
-      case "Casting:Stop":
-        if (this.session) {
-          this.closeExternal();
-        }
-        break;
-    }
-  },
-
-  observe: function(aSubject, aTopic, aData) {
-    switch (aTopic) {
-      case "ssdp-service-found":
-        this.serviceAdded(SimpleServiceDiscovery.findServiceForID(aData));
-        break;
-      case "ssdp-service-lost":
-        this.serviceLost(SimpleServiceDiscovery.findServiceForID(aData));
-        break;
-      case "application-background":
-        // Turn off polling while in the background
-        this._interval = SimpleServiceDiscovery.search(0);
-        SimpleServiceDiscovery.stopSearch();
-        break;
-      case "application-foreground":
-        // Turn polling on when app comes back to foreground
-        SimpleServiceDiscovery.search(this._interval);
-        break;
-    }
-  },
-
-  handleEvent: function(aEvent) {
-    switch (aEvent.type) {
-      case "TabSelect": {
-        let tab = BrowserApp.getTabForBrowser(aEvent.target);
-        this._updatePageActionForTab(tab, aEvent);
-        break;
-      }
-      case "pageshow": {
-        let tab = BrowserApp.getTabForWindow(aEvent.originalTarget.defaultView);
-        this._updatePageActionForTab(tab, aEvent);
-        break;
-      }
-      case "playing":
-      case "ended": {
-        let video = aEvent.target;
-        if (video instanceof HTMLVideoElement) {
-          // If playing, send the <video>, but if ended we send nothing to shutdown the pageaction
-          this._updatePageActionForVideo(
-            aEvent.type === "playing" ? video : null
-          );
-        }
-        break;
-      }
-      case "MozAutoplayMediaBlocked": {
-        if (this._bound && this._bound.has(aEvent.target)) {
-          aEvent.target.dispatchEvent(
-            new aEvent.target.ownerGlobal.CustomEvent(
-              "MozNoControlsBlockedVideo"
-            )
-          );
-        } else {
-          if (!this._blocked) {
-            this._blocked = new WeakMap();
-          }
-          this._blocked.set(aEvent.target, true);
-        }
-        break;
-      }
-      case "MozNoControlsVideoBindingAttached": {
-        if (!this._bound) {
-          this._bound = new WeakMap();
-        }
-
-        let video = this._findVideoFromEventTarget(aEvent.target);
-        if (!video) {
-          return;
-        }
-
-        this._bound.set(video, true);
-        if (this._blocked && this._blocked.has(video)) {
-          this._blocked.delete(video);
-          video.dispatchEvent(
-            new video.ownerGlobal.CustomEvent("MozNoControlsBlockedVideo")
-          );
-        }
-        break;
-      }
-    }
-  },
-
-  _findVideoFromEventTarget(aTarget) {
-    if (
-      typeof ShadowRoot !== "undefined" &&
-      aTarget.parentNode instanceof ShadowRoot &&
-      aTarget.parentNode.host instanceof HTMLVideoElement
-    ) {
-      // aTarget is <div class="videocontrols"> inside UA Widget Shadow Root
-      return aTarget.parentNode.host;
-    }
-
-    if (aTarget instanceof HTMLVideoElement) {
-      // aTarget is <video>.
-      return aTarget;
-    }
-
-    return null;
-  },
-
-  _sendEventToVideo: function _sendEventToVideo(aElement, aData) {
-    let event = aElement.ownerDocument.createEvent("CustomEvent");
-    event.initCustomEvent(
-      "media-videoCasting",
-      false,
-      true,
-      JSON.stringify(aData)
-    );
-    aElement.dispatchEvent(event);
-  },
-
-  handleVideoBindingAttached: function handleVideoBindingAttached(
-    aTab,
-    aEvent
-  ) {
-    // Let's figure out if we have everything needed to cast a video. The binding
-    // defaults to |false| so we only need to send an event if |true|.
-    let video = this._findVideoFromEventTarget(aEvent.target);
-    if (!video) {
-      return;
-    }
-
-    if (SimpleServiceDiscovery.services.length == 0) {
-      return;
-    }
-
-    this.getVideo(video, 0, 0, aBundle => {
-      // Let the binding know casting is allowed
-      if (aBundle) {
-        this._sendEventToVideo(aBundle.element, { allow: true });
-      }
-    });
-  },
-
-  handleVideoBindingCast: function handleVideoBindingCast(aTab, aEvent) {
-    // The binding wants to start a casting session
-    let video = this._findVideoFromEventTarget(aEvent.target);
-    if (!video) {
-      return;
-    }
-
-    // Close an existing session first. closeExternal has checks for an exsting
-    // session and handles remote and video binding shutdown.
-    this.closeExternal();
-
-    // Start the new session
-    UITelemetry.addEvent("cast.1", "button", null);
-    this.openExternal(video, 0, 0);
-  },
-
-  makeURI: function makeURI(aURL, aOriginCharset, aBaseURI) {
-    return Services.io.newURI(aURL, aOriginCharset, aBaseURI);
-  },
-
-  allowableExtension: function(aURI, aExtensions) {
-    return (
-      aURI instanceof Ci.nsIURL && aExtensions.includes(aURI.fileExtension)
-    );
-  },
-
-  allowableMimeType: function(aType, aTypes) {
-    return aTypes.includes(aType);
-  },
-
-  // This method will look at the aElement (or try to find a video at aX, aY) that has
-  // a castable source. If found, aCallback will be called with a JSON meta bundle. If
-  // no castable source was found, aCallback is called with null.
-  getVideo: function(aElement, aX, aY, aCallback) {
-    let extensions = SimpleServiceDiscovery.getSupportedExtensions();
-    let types = SimpleServiceDiscovery.getSupportedMimeTypes();
-
-    // Fast path: Is the given element a video element?
-    if (aElement instanceof HTMLVideoElement) {
-      // If we found a video element, no need to look further, even if no
-      // castable video source is found.
-      this._getVideo(aElement, types, extensions, aCallback);
-      return;
-    }
-
-    // Maybe this is an overlay, with the video element under it.
-    // Use the (x, y) location to guess at a <video> element.
-
-    // The context menu system will keep walking up the DOM giving us a chance
-    // to find an element we match. When it hits <html> things can go BOOM.
-    try {
-      let elements = aElement.ownerDocument.querySelectorAll("video");
-      for (let element of elements) {
-        // Look for a video element contained in the overlay bounds
-        let rect = element.getBoundingClientRect();
-        if (
-          aY >= rect.top &&
-          aX >= rect.left &&
-          aY <= rect.bottom &&
-          aX <= rect.right
-        ) {
-          // Once we find a <video> under the overlay, we check it and exit.
-          this._getVideo(element, types, extensions, aCallback);
-          return;
-        }
-      }
-    } catch (e) {}
-  },
-
-  _getContentTypeForURI: function(aURI, aElement, aCallback) {
-    let channel;
-    try {
-      let secFlags = Ci.nsILoadInfo.SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS;
-      if (aElement.crossOrigin) {
-        secFlags = Ci.nsILoadInfo.SEC_REQUIRE_CORS_DATA_INHERITS;
-        if (aElement.crossOrigin === "use-credentials") {
-          secFlags |= Ci.nsILoadInfo.SEC_COOKIES_INCLUDE;
-        }
-      }
-      channel = NetUtil.newChannel({
-        uri: aURI,
-        loadingNode: aElement,
-        securityFlags: secFlags,
-        contentPolicyType: Ci.nsIContentPolicy.TYPE_INTERNAL_VIDEO,
-      });
-    } catch (e) {
-      aCallback(null);
-      return;
-    }
-
-    let listener = {
-      onStartRequest: function(request) {
-        switch (channel.responseStatus) {
-          case 301:
-          case 302:
-          case 303:
-            request.cancel(0);
-            let location = channel.getResponseHeader("Location");
-            CastingApps._getContentTypeForURI(
-              CastingApps.makeURI(location),
-              aElement,
-              aCallback
-            );
-            break;
-          default:
-            aCallback(channel.contentType);
-            request.cancel(0);
-            break;
-        }
-      },
-      onStopRequest: function(request, statusCode) {},
-      onDataAvailable: function(request, stream, offset, count) {},
-    };
-
-    if (channel) {
-      channel.asyncOpen(listener);
-    } else {
-      aCallback(null);
-    }
-  },
-
-  // Because this method uses a callback, make sure we return ASAP if we know
-  // we have a castable video source.
-  _getVideo: function(aElement, aTypes, aExtensions, aCallback) {
-    // Keep a list of URIs we need for an async mimetype check
-    let asyncURIs = [];
-
-    // Grab the poster attribute from the <video>
-    let posterURL = aElement.poster;
-
-    // First, look to see if the <video> has a src attribute
-    let sourceURL = aElement.src;
-
-    // If empty, try the currentSrc
-    if (!sourceURL) {
-      sourceURL = aElement.currentSrc;
-    }
-
-    if (sourceURL) {
-      // Use the file extension to guess the mime type
-      let sourceURI = this.makeURI(
-        sourceURL,
-        null,
-        this.makeURI(aElement.baseURI)
-      );
-      if (this.allowableExtension(sourceURI, aExtensions)) {
-        aCallback({
-          element: aElement,
-          source: sourceURI.spec,
-          poster: posterURL,
-          sourceURI: sourceURI,
-        });
-        return;
-      }
-
-      if (aElement.type) {
-        // Fast sync check
-        if (this.allowableMimeType(aElement.type, aTypes)) {
-          aCallback({
-            element: aElement,
-            source: sourceURI.spec,
-            poster: posterURL,
-            sourceURI: sourceURI,
-            type: aElement.type,
-          });
-          return;
-        }
-      }
-
-      // Delay the async check until we sync scan all possible URIs
-      asyncURIs.push(sourceURI);
-    }
-
-    // Next, look to see if there is a <source> child element that meets
-    // our needs
-    let sourceNodes = aElement.getElementsByTagName("source");
-    for (let sourceNode of sourceNodes) {
-      let sourceURI = this.makeURI(
-        sourceNode.src,
-        null,
-        this.makeURI(sourceNode.baseURI)
-      );
-
-      // Using the type attribute is our ideal way to guess the mime type. Otherwise,
-      // fallback to using the file extension to guess the mime type
-      if (this.allowableExtension(sourceURI, aExtensions)) {
-        aCallback({
-          element: aElement,
-          source: sourceURI.spec,
-          poster: posterURL,
-          sourceURI: sourceURI,
-          type: sourceNode.type,
-        });
-        return;
-      }
-
-      if (sourceNode.type) {
-        // Fast sync check
-        if (this.allowableMimeType(sourceNode.type, aTypes)) {
-          aCallback({
-            element: aElement,
-            source: sourceURI.spec,
-            poster: posterURL,
-            sourceURI: sourceURI,
-            type: sourceNode.type,
-          });
-          return;
-        }
-      }
-
-      // Delay the async check until we sync scan all possible URIs
-      asyncURIs.push(sourceURI);
-    }
-
-    // Helper method that walks the array of possible URIs, fetching the mimetype as we go.
-    // As soon as we find a good sourceURL, avoid firing the callback any further
-    var _getContentTypeForURIs = aURIs => {
-      // Do an async fetch to figure out the mimetype of the source video
-      let sourceURI = aURIs.pop();
-      this._getContentTypeForURI(sourceURI, aElement, aType => {
-        if (this.allowableMimeType(aType, aTypes)) {
-          // We found a supported mimetype.
-          aCallback({
-            element: aElement,
-            source: sourceURI.spec,
-            poster: posterURL,
-            sourceURI: sourceURI,
-            type: aType,
-          });
-        } else if (aURIs.length > 0) {
-          // This URI was not a supported mimetype, so let's try the next, if we have more.
-          _getContentTypeForURIs(aURIs);
-        } else {
-          // We were not able to find a supported mimetype.
-          aCallback(null);
-        }
-      });
-    };
-
-    // If we didn't find a good URI directly, let's look using async methods.
-    if (asyncURIs.length > 0) {
-      _getContentTypeForURIs(asyncURIs);
-    }
-  },
-
-  // This code depends on handleVideoBindingAttached setting mozAllowCasting
-  // so we can quickly figure out if the video is castable
-  isVideoCastable: function(aElement, aX, aY) {
-    // Use the flag set when the <video> binding was created as the check
-    if (aElement instanceof HTMLVideoElement) {
-      return aElement.mozAllowCasting;
-    }
-
-    // This is called by the context menu system and the system will keep
-    // walking up the DOM giving us a chance to find an element we match.
-    // When it hits <html> things can go BOOM.
-    try {
-      // Maybe this is an overlay, with the video element under it
-      // Use the (x, y) location to guess at a <video> element
-      let elements = aElement.ownerDocument.querySelectorAll("video");
-      for (let element of elements) {
-        // Look for a video element contained in the overlay bounds
-        let rect = element.getBoundingClientRect();
-        if (
-          aY >= rect.top &&
-          aX >= rect.left &&
-          aY <= rect.bottom &&
-          aX <= rect.right
-        ) {
-          // Use the flag set when the <video> binding was created as the check
-          return element.mozAllowCasting;
-        }
-      }
-    } catch (e) {}
-
-    return false;
-  },
-
-  filterCast: {
-    matches: function(aElement, aX, aY) {
-      // This behavior matches the pageaction: As long as a video is castable,
-      // we can cast it, even if it's already being cast to a device.
-      if (SimpleServiceDiscovery.services.length == 0) {
-        return false;
-      }
-      return CastingApps.isVideoCastable(aElement, aX, aY);
-    },
-  },
-
-  pageAction: {
-    click: function() {
-      // Since this is a pageaction, we use the selected browser
-      let browser = BrowserApp.selectedBrowser;
-      if (!browser) {
-        return;
-      }
-
-      // Look for a castable <video> that is playing, and start casting it
-      let videos = browser.contentDocument.querySelectorAll("video");
-      for (let video of videos) {
-        if (!video.paused && video.mozAllowCasting) {
-          UITelemetry.addEvent("cast.1", "pageaction", null);
-          CastingApps.openExternal(video, 0, 0);
-          return;
-        }
-      }
-    },
-  },
-
-  _findCastableVideo: function _findCastableVideo(aBrowser) {
-    if (!aBrowser) {
-      return null;
-    }
-
-    // Scan for a <video> being actively cast. Also look for a castable <video>
-    // on the page.
-    let castableVideo = null;
-    let videos = aBrowser.contentDocument.querySelectorAll("video");
-    for (let video of videos) {
-      if (video.mozIsCasting) {
-        // This <video> is cast-active. Break out of loop.
-        return video;
-      }
-
-      if (!video.paused && video.mozAllowCasting) {
-        // This <video> is cast-ready. Keep looking so cast-active could be found.
-        castableVideo = video;
-      }
-    }
-
-    // Could be null
-    return castableVideo;
-  },
-
-  _updatePageActionForTab: function _updatePageActionForTab(aTab, aEvent) {
-    // We only care about events on the selected tab
-    if (aTab != BrowserApp.selectedTab) {
-      return;
-    }
-
-    // Update the page action, scanning for a castable <video>
-    this._updatePageAction();
-  },
-
-  _updatePageActionForVideo: function _updatePageActionForVideo(aVideo) {
-    this._updatePageAction(aVideo);
-  },
-
-  _updatePageAction: function _updatePageAction(aVideo) {
-    // Remove any exising pageaction first, in case state changes or we don't have
-    // a castable video
-    if (this.pageAction.id) {
-      PageActions.remove(this.pageAction.id);
-      delete this.pageAction.id;
-    }
-
-    if (!aVideo) {
-      aVideo = this._findCastableVideo(BrowserApp.selectedBrowser);
-      if (!aVideo) {
-        return;
-      }
-    }
-
-    // We only show pageactions if the <video> is from the selected tab
-    if (
-      BrowserApp.selectedTab !=
-      BrowserApp.getTabForWindow(aVideo.ownerGlobal.top)
-    ) {
-      return;
-    }
-
-    // We check for two state here:
-    // 1. The video is actively being cast
-    // 2. The video is allowed to be cast and is currently playing
-    // Both states have the same action: Show the cast page action
-    if (aVideo.mozIsCasting) {
-      this.pageAction.id = PageActions.add({
-        title: Strings.browser.GetStringFromName("contextmenu.sendToDevice"),
-        icon: "drawable://casting_active",
-        clickCallback: this.pageAction.click,
-        important: true,
-        useTint: false,
-      });
-    } else if (aVideo.mozAllowCasting) {
-      this.pageAction.id = PageActions.add({
-        title: Strings.browser.GetStringFromName("contextmenu.sendToDevice"),
-        icon: "drawable://casting",
-        clickCallback: this.pageAction.click,
-        important: true,
-        useTint: true,
-      });
-    }
-  },
-
-  prompt: function(aWindow, aCallback, aFilterFunc) {
-    let items = [];
-    let filteredServices = [];
-    SimpleServiceDiscovery.services.forEach(function(aService) {
-      let item = {
-        label: aService.friendlyName,
-        selected: false,
-      };
-      if (!aFilterFunc || aFilterFunc(aService)) {
-        filteredServices.push(aService);
-        items.push(item);
-      }
-    });
-
-    if (items.length == 0) {
-      return;
-    }
-
-    let prompt = new Prompt({
-      window: aWindow,
-      title: Strings.browser.GetStringFromName("casting.sendToDevice"),
-    })
-      .setSingleChoiceItems(items)
-      .show(function(data) {
-        let selected = data.button;
-        let service = selected == -1 ? null : filteredServices[selected];
-        if (aCallback) {
-          aCallback(service);
-        }
-      });
-  },
-
-  handleContextMenu: function(aElement, aX, aY) {
-    UITelemetry.addEvent("action.1", "contextmenu", null, "web_cast");
-    UITelemetry.addEvent("cast.1", "contextmenu", null);
-    this.openExternal(aElement, aX, aY);
-  },
-
-  openExternal: function(aElement, aX, aY) {
-    // Start a second screen media service
-    this.getVideo(aElement, aX, aY, this._openExternal.bind(this));
-  },
-
-  _openExternal: function(aVideo) {
-    if (!aVideo) {
-      return;
-    }
-
-    function filterFunc(aService) {
-      return (
-        this.allowableExtension(aVideo.sourceURI, aService.extensions) ||
-        this.allowableMimeType(aVideo.type, aService.types)
-      );
-    }
-
-    this.prompt(
-      aVideo.element.ownerGlobal,
-      aService => {
-        if (!aService) {
-          return;
-        }
-
-        // Make sure we have a player app for the given service
-        let app = SimpleServiceDiscovery.findAppForService(aService);
-        if (!app) {
-          return;
-        }
-
-        if (aVideo.element) {
-          aVideo.title = aVideo.element.ownerGlobal.top.document.title;
-
-          // If the video is currently playing on the device, pause it
-          if (!aVideo.element.paused) {
-            aVideo.element.pause();
-          }
-        }
-
-        app.stop(() => {
-          app.start(aStarted => {
-            if (!aStarted) {
-              dump("CastingApps: Unable to start app");
-              return;
-            }
-
-            app.remoteMedia(aRemoteMedia => {
-              if (!aRemoteMedia) {
-                dump("CastingApps: Failed to create remotemedia");
-                return;
-              }
-
-              this.session = {
-                service: aService,
-                app: app,
-                remoteMedia: aRemoteMedia,
-                data: {
-                  title: aVideo.title,
-                  source: aVideo.source,
-                  poster: aVideo.poster,
-                },
-                videoRef: Cu.getWeakReference(aVideo.element),
-              };
-            }, this);
-          });
-        });
-      },
-      filterFunc.bind(this)
-    );
-  },
-
-  closeExternal: function() {
-    if (!this.session) {
-      return;
-    }
-
-    this.session.remoteMedia.shutdown();
-    this._shutdown();
-  },
-
-  _shutdown: function() {
-    if (!this.session) {
-      return;
-    }
-
-    this.session.app.stop();
-    let video = this.session.videoRef.get();
-    if (video) {
-      this._sendEventToVideo(video, { active: false });
-      this._updatePageAction();
-    }
-
-    delete this.session;
-  },
-
-  // RemoteMedia callback API methods
-  onRemoteMediaStart: function(aRemoteMedia) {
-    if (!this.session) {
-      return;
-    }
-
-    aRemoteMedia.load(this.session.data);
-    GlobalEventDispatcher.sendRequest({
-      type: "Casting:Started",
-      device: this.session.service.friendlyName,
-    });
-
-    let video = this.session.videoRef.get();
-    if (video) {
-      this._sendEventToVideo(video, { active: true });
-      this._updatePageAction(video);
-    }
-  },
-
-  onRemoteMediaStop: function(aRemoteMedia) {
-    GlobalEventDispatcher.sendRequest({ type: "Casting:Stopped" });
-    this._shutdown();
-  },
-
-  onRemoteMediaStatus: function(aRemoteMedia) {
-    if (!this.session) {
-      return;
-    }
-
-    let status = aRemoteMedia.status;
-    switch (status) {
-      case "started":
-        GlobalEventDispatcher.sendRequest({ type: "Casting:Playing" });
-        break;
-      case "paused":
-        GlobalEventDispatcher.sendRequest({ type: "Casting:Paused" });
-        break;
-      case "completed":
-        this.closeExternal();
-        break;
-    }
-  },
-};
diff --git a/mobile/android/chrome/content/ConsoleAPI.js b/mobile/android/chrome/content/ConsoleAPI.js
deleted file mode 100644
index fa4a561649c5..000000000000
--- a/mobile/android/chrome/content/ConsoleAPI.js
+++ /dev/null
@@ -1,145 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-var ConsoleAPI = {
-  observe: function observe(aMessage, aTopic, aData) {
-    aMessage = aMessage.wrappedJSObject;
-
-    let mappedArguments = Array.from(
-      aMessage.arguments,
-      this.formatResult,
-      this
-    );
-    let joinedArguments = mappedArguments.join(" ");
-
-    if (aMessage.level == "error" || aMessage.level == "warn") {
-      let flag =
-        aMessage.level == "error"
-          ? Ci.nsIScriptError.errorFlag
-          : Ci.nsIScriptError.warningFlag;
-      let consoleMsg = Cc["@mozilla.org/scripterror;1"].createInstance(
-        Ci.nsIScriptError
-      );
-      consoleMsg.init(
-        joinedArguments,
-        null,
-        null,
-        0,
-        0,
-        flag,
-        "content javascript"
-      );
-      Services.console.logMessage(consoleMsg);
-    } else if (aMessage.level == "trace") {
-      let bundle = Services.strings.createBundle(
-        "chrome://browser/locale/browser.properties"
-      );
-      let args = aMessage.arguments;
-      let filename = this.abbreviateSourceURL(args[0].filename);
-      let functionName =
-        args[0].functionName ||
-        bundle.GetStringFromName("stacktrace.anonymousFunction");
-      let lineNumber = args[0].lineNumber;
-
-      let body = bundle.formatStringFromName("stacktrace.outputMessage", [
-        filename,
-        functionName,
-        lineNumber,
-      ]);
-      body += "\n";
-      args.forEach(function(aFrame) {
-        let functionName =
-          aFrame.functionName ||
-          bundle.GetStringFromName("stacktrace.anonymousFunction");
-        body +=
-          "  " +
-          aFrame.filename +
-          " :: " +
-          functionName +
-          " :: " +
-          aFrame.lineNumber +
-          "\n";
-      });
-
-      Services.console.logStringMessage(body);
-    } else if (aMessage.level == "time" && aMessage.arguments) {
-      let bundle = Services.strings.createBundle(
-        "chrome://browser/locale/browser.properties"
-      );
-      let body = bundle.formatStringFromName("timer.start", [
-        aMessage.arguments.name,
-      ]);
-      Services.console.logStringMessage(body);
-    } else if (aMessage.level == "timeEnd" && aMessage.arguments) {
-      let bundle = Services.strings.createBundle(
-        "chrome://browser/locale/browser.properties"
-      );
-      let body = bundle.formatStringFromName("timer.end", [
-        aMessage.arguments.name,
-        aMessage.arguments.duration,
-      ]);
-      Services.console.logStringMessage(body);
-    } else if (
-      ["group", "groupCollapsed", "groupEnd"].includes(aMessage.level)
-    ) {
-      // Do nothing yet
-    } else {
-      Services.console.logStringMessage(joinedArguments);
-    }
-  },
-
-  getResultType: function getResultType(aResult) {
-    let type = aResult === null ? "null" : typeof aResult;
-    if (type == "object" && aResult.constructor && aResult.constructor.name) {
-      type = aResult.constructor.name;
-    }
-    return type.toLowerCase();
-  },
-
-  formatResult: function formatResult(aResult) {
-    let output = "";
-    let type = this.getResultType(aResult);
-    switch (type) {
-      case "string":
-      case "boolean":
-      case "date":
-      case "error":
-      case "number":
-      case "regexp":
-        output = aResult.toString();
-        break;
-      case "null":
-      case "undefined":
-        output = type;
-        break;
-      default:
-        output = aResult.toString();
-        break;
-    }
-
-    return output;
-  },
-
-  abbreviateSourceURL: function abbreviateSourceURL(aSourceURL) {
-    // Remove any query parameters.
-    let hookIndex = aSourceURL.indexOf("?");
-    if (hookIndex > -1) {
-      aSourceURL = aSourceURL.substring(0, hookIndex);
-    }
-
-    // Remove a trailing "/".
-    if (aSourceURL[aSourceURL.length - 1] == "/") {
-      aSourceURL = aSourceURL.substring(0, aSourceURL.length - 1);
-    }
-
-    // Remove all but the last path component.
-    let slashIndex = aSourceURL.lastIndexOf("/");
-    if (slashIndex > -1) {
-      aSourceURL = aSourceURL.substring(slashIndex + 1);
-    }
-
-    return aSourceURL;
-  },
-};
diff --git a/mobile/android/chrome/content/EmbedRT.js b/mobile/android/chrome/content/EmbedRT.js
deleted file mode 100644
index 82be5f7f83b0..000000000000
--- a/mobile/android/chrome/content/EmbedRT.js
+++ /dev/null
@@ -1,73 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "ConsoleAPI",
-  "resource://gre/modules/Console.jsm"
-);
-
-/*
- * Collection of methods and features specific to using a GeckoView instance.
- * The code is isolated from browser.js for code size and performance reasons.
- */
-var EmbedRT = {
-  _scopes: {},
-
-  onEvent: function(event, data, callback) {
-    switch (event) {
-      case "GeckoView:ImportScript":
-        this.importScript(data.scriptURL);
-        break;
-    }
-  },
-
-  /*
-   * Loads a script file into a sandbox and calls an optional load function
-   */
-  importScript: function(scriptURL) {
-    if (scriptURL in this._scopes) {
-      return;
-    }
-
-    let principal = Cc["@mozilla.org/systemprincipal;1"].createInstance(
-      Ci.nsIPrincipal
-    );
-
-    let sandbox = new Cu.Sandbox(principal, {
-      sandboxName: scriptURL,
-      wantGlobalProperties: ["indexedDB"],
-    });
-
-    sandbox.console = new ConsoleAPI({ consoleID: "script/" + scriptURL });
-
-    // As we don't want our caller to control the JS version used for the
-    // script file, we run loadSubScript within the context of the
-    // sandbox with the latest JS version set explicitly.
-    sandbox.__SCRIPT_URI_SPEC__ = scriptURL;
-    Cu.evalInSandbox(
-      "Components.classes['@mozilla.org/moz/jssubscript-loader;1'].createInstance(Components.interfaces.mozIJSSubScriptLoader).loadSubScript(__SCRIPT_URI_SPEC__);",
-      sandbox,
-      "ECMAv5"
-    );
-
-    this._scopes[scriptURL] = sandbox;
-
-    if ("load" in sandbox) {
-      let params = {
-        window: window,
-        resourceURI: scriptURL,
-      };
-
-      try {
-        sandbox.load(params);
-      } catch (e) {
-        dump(
-          "Exception calling 'load' method in script: " + scriptURL + "\n" + e
-        );
-      }
-    }
-  },
-};
diff --git a/mobile/android/chrome/content/ExtensionPermissions.js b/mobile/android/chrome/content/ExtensionPermissions.js
deleted file mode 100644
index 1c1b8475ac06..000000000000
--- a/mobile/android/chrome/content/ExtensionPermissions.js
+++ /dev/null
@@ -1,158 +0,0 @@
-"use strict";
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "ExtensionData",
-  "resource://gre/modules/Extension.jsm"
-);
-
-var ExtensionPermissions = {
-  // id -> object containing update details (see applyUpdate() )
-  updates: new Map(),
-
-  // Prepare the strings needed for a permission notification.
-  _prepareStrings(info) {
-    let appName = Strings.brand.GetStringFromName("brandShortName");
-    let info2 = Object.assign({ appName }, info);
-    let strings = ExtensionData.formatPermissionStrings(info2, Strings.browser);
-
-    // We dump the main body of the dialog into a big android
-    // TextView.  Build a big string with the full contents here.
-    let message = "";
-    if (strings.msgs.length > 0) {
-      message = [
-        strings.listIntro,
-        ...strings.msgs.map(s => `\u2022 ${s}`),
-      ].join("\n");
-    }
-
-    return {
-      header: strings.header.replace("<>", info.addonName),
-      message,
-      acceptText: strings.acceptText,
-      cancelText: strings.cancelText,
-    };
-  },
-
-  // Prepare an icon for a permission notification
-  _prepareIcon(iconURL) {
-    // We can render pngs with ResourceDrawableUtils
-    if (iconURL.endsWith(".png")) {
-      return iconURL;
-    }
-
-    // If we can't render an icon, show the default
-    return "DEFAULT";
-  },
-
-  async observe(subject, topic, data) {
-    switch (topic) {
-      case "webextension-permission-prompt": {
-        let { target, info } = subject.wrappedJSObject;
-        let stringInfo = Object.assign({ addonName: info.addon.name }, info);
-        let details = this._prepareStrings(stringInfo);
-        details.icon = this._prepareIcon(info.icon);
-        details.type = "Extension:PermissionPrompt";
-        let accepted = await EventDispatcher.instance.sendRequestForResult(
-          details
-        );
-
-        if (accepted) {
-          info.resolve();
-        } else {
-          info.reject();
-        }
-        break;
-      }
-
-      case "webextension-update-permissions":
-        let info = subject.wrappedJSObject;
-        let { addon, resolve, reject } = info;
-        let stringInfo = Object.assign(
-          {
-            type: "update",
-            addonName: addon.name,
-          },
-          info
-        );
-
-        let details = this._prepareStrings(stringInfo);
-
-        // If there are no promptable permissions, just apply the update
-        if (details.message.length == 0) {
-          resolve();
-          return;
-        }
-
-        // Store all the details about the update until the user chooses to
-        // look at update, at which point we will pick up in this.applyUpdate()
-        details.icon = this._prepareIcon(addon.iconURL || "dummy.svg");
-
-        let first = this.updates.size == 0;
-        this.updates.set(addon.id, { details, resolve, reject });
-
-        if (first) {
-          EventDispatcher.instance.sendRequest({
-            type: "Extension:ShowUpdateIcon",
-            value: true,
-          });
-        }
-        break;
-
-      case "webextension-optional-permission-prompt": {
-        let info = subject.wrappedJSObject;
-        let { name, resolve } = info;
-        let stringInfo = Object.assign(
-          {
-            type: "optional",
-            addonName: name,
-          },
-          info
-        );
-
-        let details = this._prepareStrings(stringInfo);
-
-        // If there are no promptable permissions, just apply the update
-        if (details.message.length == 0) {
-          resolve(true);
-          return;
-        }
-
-        // Store all the details about the update until the user chooses to
-        // look at update, at which point we will pick up in this.applyUpdate()
-        details.icon = this._prepareIcon(info.icon || "dummy.svg");
-
-        details.type = "Extension:PermissionPrompt";
-        let accepted = await EventDispatcher.instance.sendRequestForResult(
-          details
-        );
-        resolve(accepted);
-      }
-    }
-  },
-
-  async applyUpdate(id) {
-    if (!this.updates.has(id)) {
-      return;
-    }
-
-    let update = this.updates.get(id);
-    this.updates.delete(id);
-    if (this.updates.size == 0) {
-      EventDispatcher.instance.sendRequest({
-        type: "Extension:ShowUpdateIcon",
-        value: false,
-      });
-    }
-
-    let { details } = update;
-    details.type = "Extension:PermissionPrompt";
-
-    let accepted = await EventDispatcher.instance.sendRequestForResult(details);
-    if (accepted) {
-      update.resolve();
-    } else {
-      update.reject();
-    }
-  },
-};
diff --git a/mobile/android/chrome/content/FeedHandler.js b/mobile/android/chrome/content/FeedHandler.js
deleted file mode 100644
index 72c7a4d27ccb..000000000000
--- a/mobile/android/chrome/content/FeedHandler.js
+++ /dev/null
@@ -1,147 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-var FeedHandler = {
-  PREF_CONTENTHANDLERS_BRANCH: "browser.contentHandlers.types.",
-  TYPE_MAYBE_FEED: "application/vnd.mozilla.maybe.feed",
-
-  _contentTypes: null,
-
-  getContentHandlers: function fh_getContentHandlers(contentType) {
-    if (!this._contentTypes) {
-      this.loadContentHandlers();
-    }
-
-    if (!(contentType in this._contentTypes)) {
-      return [];
-    }
-
-    return this._contentTypes[contentType];
-  },
-
-  loadContentHandlers: function fh_loadContentHandlers() {
-    this._contentTypes = {};
-
-    let kids = Services.prefs
-      .getBranch(this.PREF_CONTENTHANDLERS_BRANCH)
-      .getChildList("");
-
-    // First get the numbers of the providers by getting all ###.uri prefs
-    let nums = [];
-    for (let i = 0; i < kids.length; i++) {
-      let match = /^(\d+)\.uri$/.exec(kids[i]);
-      if (!match) {
-        continue;
-      } else {
-        nums.push(match[1]);
-      }
-    }
-
-    // Sort them, to get them back in order
-    nums.sort(function(a, b) {
-      return a - b;
-    });
-
-    // Now register them
-    for (let i = 0; i < nums.length; i++) {
-      let branch = Services.prefs.getBranch(
-        this.PREF_CONTENTHANDLERS_BRANCH + nums[i] + "."
-      );
-      let vals = branch.getChildList("");
-      if (vals.length == 0) {
-        return;
-      }
-
-      try {
-        let type = branch.getCharPref("type");
-        let uri = branch.getComplexValue("uri", Ci.nsIPrefLocalizedString).data;
-        let title = branch.getComplexValue("title", Ci.nsIPrefLocalizedString)
-          .data;
-
-        if (!(type in this._contentTypes)) {
-          this._contentTypes[type] = [];
-        }
-        this._contentTypes[type].push({
-          contentType: type,
-          uri: uri,
-          name: title,
-        });
-      } catch (ex) {}
-    }
-  },
-
-  onEvent: function fh_onEvent(event, args, callback) {
-    if (event === "Feeds:Subscribe") {
-      let tab = BrowserApp.getTabForId(args.tabId);
-      if (!tab) {
-        return;
-      }
-
-      let browser = tab.browser;
-      let feeds = browser.feeds;
-      if (feeds == null) {
-        return;
-      }
-
-      // First, let's decide on which feed to subscribe
-      let feedIndex = -1;
-      if (feeds.length > 1) {
-        let p = new Prompt({
-          window: browser.contentWindow,
-          title: Strings.browser.GetStringFromName("feedHandler.chooseFeed"),
-        })
-          .setSingleChoiceItems(
-            feeds.map(function(feed) {
-              return { label: feed.title || feed.href };
-            })
-          )
-          .show(data => {
-            feedIndex = data.button;
-            if (feedIndex == -1) {
-              return;
-            }
-
-            this.loadFeed(feeds[feedIndex], browser);
-          });
-        return;
-      }
-
-      this.loadFeed(feeds[0], browser);
-    }
-  },
-
-  loadFeed: function fh_loadFeed(aFeed, aBrowser) {
-    let feedURL = aFeed.href;
-
-    // Next, we decide on which service to send the feed
-    let handlers = this.getContentHandlers(this.TYPE_MAYBE_FEED);
-    if (handlers.length == 0) {
-      return;
-    }
-
-    // JSON for Prompt
-    let p = new Prompt({
-      window: aBrowser.contentWindow,
-      title: Strings.browser.GetStringFromName("feedHandler.subscribeWith"),
-    })
-      .setSingleChoiceItems(
-        handlers.map(function(handler) {
-          return { label: handler.name };
-        })
-      )
-      .show(function(data) {
-        if (data.button == -1) {
-          return;
-        }
-
-        // Merge the handler URL and the feed URL
-        let readerURL = handlers[data.button].uri;
-        readerURL = readerURL.replace(/%s/gi, encodeURIComponent(feedURL));
-
-        // Open the resultant URL in a new tab
-        BrowserApp.addTab(readerURL, { parentId: BrowserApp.selectedTab.id });
-      });
-  },
-};
diff --git a/mobile/android/chrome/content/Feedback.js b/mobile/android/chrome/content/Feedback.js
deleted file mode 100644
index 2f1725f7648d..000000000000
--- a/mobile/android/chrome/content/Feedback.js
+++ /dev/null
@@ -1,69 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-var Feedback = {
-  get _feedbackURL() {
-    delete this._feedbackURL;
-    return (this._feedbackURL = Services.urlFormatter.formatURLPref(
-      "app.feedbackURL"
-    ));
-  },
-
-  onEvent: function(event, data, callback) {
-    if (event !== "Feedback:Show") {
-      return;
-    }
-
-    // Don't prompt for feedback in distribution builds.
-    try {
-      Services.prefs.getCharPref("distribution.id");
-      return;
-    } catch (e) {}
-
-    let url = this._feedbackURL;
-    let browser = BrowserApp.selectOrAddTab(url, {
-      parentId: BrowserApp.selectedTab.id,
-    }).browser;
-
-    browser.addEventListener("FeedbackClose", this, false, true);
-    browser.addEventListener("FeedbackMaybeLater", this, false, true);
-
-    // Dispatch a custom event to the page content when feedback is prompted by the browser.
-    // This will be used by the page to determine it's being loaded directly by the browser,
-    // instead of by the user visiting the page, e.g. through browser history.
-    function loadListener(event) {
-      browser.removeEventListener("DOMContentLoaded", loadListener);
-      browser.contentDocument.dispatchEvent(
-        new CustomEvent("FeedbackPrompted")
-      );
-    }
-    browser.addEventListener("DOMContentLoaded", loadListener);
-  },
-
-  handleEvent: function(event) {
-    if (!this._isAllowed(event.target)) {
-      return;
-    }
-
-    switch (event.type) {
-      case "FeedbackClose":
-        // Do nothing.
-        break;
-
-      case "FeedbackMaybeLater":
-        GlobalEventDispatcher.sendRequest({ type: "Feedback:MaybeLater" });
-        break;
-    }
-
-    let win = event.target.ownerGlobal.top;
-    BrowserApp.closeTab(BrowserApp.getTabForWindow(win));
-  },
-
-  _isAllowed: function(node) {
-    let uri = node.ownerDocument.documentURIObject;
-    let feedbackURI = Services.io.newURI(this._feedbackURL);
-    return uri.prePath === feedbackURI.prePath;
-  },
-};
diff --git a/mobile/android/chrome/content/FindHelper.js b/mobile/android/chrome/content/FindHelper.js
deleted file mode 100644
index 7f53677b6776..000000000000
--- a/mobile/android/chrome/content/FindHelper.js
+++ /dev/null
@@ -1,231 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-var FindHelper = {
-  _finder: null,
-  _targetTab: null,
-  _initialViewport: null,
-  _viewportChanged: false,
-  _result: null,
-
-  // Start of nsIObserver implementation.
-
-  onEvent: function(event, data, callback) {
-    switch (event) {
-      case "FindInPage:Opened": {
-        this._findOpened();
-        break;
-      }
-
-      case "FindInPage:Closed": {
-        this._uninit();
-        this._findClosed();
-        break;
-      }
-
-      case "Tab:Selected": {
-        // Allow for page switching.
-        this._uninit();
-        break;
-      }
-
-      case "FindInPage:Find": {
-        this.doFind(data.searchString);
-        break;
-      }
-
-      case "FindInPage:Next": {
-        this.findAgain(data.searchString, false);
-        break;
-      }
-
-      case "FindInPage:Prev": {
-        this.findAgain(data.searchString, true);
-        break;
-      }
-    }
-  },
-
-  /**
-   * When the FindInPageBar opens/ becomes visible, it's time to:
-   * 1. Add listeners for other message types sent from the FindInPageBar
-   * 2. initialize the Finder instance, if necessary.
-   */
-  _findOpened: function() {
-    GlobalEventDispatcher.registerListener(this, [
-      "FindInPage:Find",
-      "FindInPage:Next",
-      "FindInPage:Prev",
-    ]);
-
-    // Initialize the finder component for the current page by performing a fake find.
-    this._init();
-    this._finder.requestMatchesCount("");
-  },
-
-  /**
-   * Fetch the Finder instance from the active tabs' browser and start tracking
-   * the active viewport.
-   */
-  _init: function() {
-    // If there's no find in progress, start one.
-    if (this._finder) {
-      return;
-    }
-
-    this._targetTab = BrowserApp.selectedTab;
-    try {
-      this._finder = this._targetTab.browser.finder;
-    } catch (e) {
-      throw new Error(
-        "FindHelper: " +
-          e +
-          "\n" +
-          "JS stack: \n" +
-          (e.stack || Components.stack.formattedStack)
-      );
-    }
-
-    this._finder.addResultListener(this);
-    this._initialViewport = JSON.stringify(this._targetTab.getViewport());
-    this._viewportChanged = false;
-
-    WindowEventDispatcher.registerListener(this, ["Tab:Selected"]);
-  },
-
-  /**
-   * Detach from the Finder instance (so stop listening for messages) and stop
-   * tracking the active viewport.
-   */
-  _uninit: function() {
-    // If there's no find in progress, there's nothing to clean up.
-    if (!this._finder) {
-      return;
-    }
-
-    this._finder.removeSelection();
-    this._finder.removeResultListener(this);
-    this._finder = null;
-    this._targetTab = null;
-    this._initialViewport = null;
-    this._viewportChanged = false;
-
-    WindowEventDispatcher.unregisterListener(this, ["Tab:Selected"]);
-  },
-
-  /**
-   * When the FindInPageBar closes, it's time to stop listening for its messages.
-   */
-  _findClosed: function() {
-    GlobalEventDispatcher.unregisterListener(this, [
-      "FindInPage:Find",
-      "FindInPage:Next",
-      "FindInPage:Prev",
-    ]);
-  },
-
-  /**
-   * Start an asynchronous find-in-page operation, using the current Finder
-   * instance and request to count the amount of matches.
-   * If no Finder instance is currently active, we'll lazily initialize it here.
-   *
-   * @param  {String} searchString Word to search for in the current document
-   * @return {Object}              Echo of the current find action
-   */
-  doFind: function(searchString) {
-    if (!this._finder) {
-      this._init();
-    }
-
-    this._finder.fastFind(searchString, false);
-    return { searchString, findBackwards: false };
-  },
-
-  /**
-   * Restart the same find-in-page operation as before via `doFind()`. If we
-   * haven't called `doFind()`, we simply kick off a regular find.
-   *
-   * @param  {String}  searchString  Word to search for in the current document
-   * @param  {Boolean} findBackwards Direction to search in
-   * @return {Object}                Echo of the current find action
-   */
-  findAgain: function(searchString, findBackwards) {
-    // This always happens if the user taps next/previous after re-opening the
-    // search bar, and not only forces _init() but also an initial fastFind(STRING)
-    // before any findAgain(DIRECTION).
-    if (!this._finder) {
-      return this.doFind(searchString);
-    }
-
-    this._finder.findAgain(searchString, findBackwards, false, false);
-    return { searchString, findBackwards };
-  },
-
-  // Start of Finder.jsm listener implementation.
-
-  /**
-   * Pass along the count results to FindInPageBar for display. The result that
-   * is sent to the FindInPageBar is augmented with the current find-in-page count
-   * limit.
-   *
-   * @param {Object} result Result coming from the Finder instance that contains
-   *                        the following properties:
-   *                        - {Number} total   The total amount of matches found
-   *                        - {Number} current The index of current found range
-   *                                           in the document
-   */
-  onMatchesCountResult: function(result) {
-    this._result = result;
-
-    GlobalEventDispatcher.sendRequest(
-      Object.assign(
-        {
-          type: "FindInPage:MatchesCountResult",
-        },
-        this._result
-      )
-    );
-  },
-
-  /**
-   * When a find-in-page action finishes, this method is invoked. This is mainly
-   * used at the moment to detect if the current viewport has changed, which might
-   * be indicated by not finding a string in the current page.
-   *
-   * @param {Object} aData A dictionary, representing the find result, which
-   *                       contains the following properties:
-   *                       - {String}  searchString  Word that was searched for
-   *                                                 in the current document
-   *                       - {Number}  result        One of the following
-   *                                                 Ci.nsITypeAheadFind.* result
-   *                                                 indicators: FIND_FOUND,
-   *                                                 FIND_NOTFOUND, FIND_WRAPPED,
-   *                                                 FIND_PENDING
-   *                       - {Boolean} findBackwards Whether the search direction
-   *                                                 was backwards
-   *                       - {Boolean} findAgain     Whether the previous search
-   *                                                 was repeated
-   *                       - {Boolean} drawOutline   Whether we may (re-)draw the
-   *                                                 outline of a hyperlink
-   *                       - {Boolean} linksOnly     Whether links-only mode was
-   *                                                 active
-   */
-  onFindResult: function(aData) {
-    if (aData.result == Ci.nsITypeAheadFind.FIND_NOTFOUND) {
-      if (this._viewportChanged) {
-        if (this._targetTab != BrowserApp.selectedTab) {
-          // this should never happen
-          Cu.reportError("Warning: selected tab changed during find!");
-          // fall through and restore viewport on the initial tab anyway
-        }
-        this._targetTab.sendViewportUpdate();
-      }
-    } else {
-      // Disabled until bug 1014113 is fixed
-      // ZoomHelper.zoomToRect(aData.rect);
-      this._viewportChanged = true;
-    }
-  },
-};
diff --git a/mobile/android/chrome/content/Linkify.js b/mobile/android/chrome/content/Linkify.js
deleted file mode 100644
index dbb5e71151f4..000000000000
--- a/mobile/android/chrome/content/Linkify.js
+++ /dev/null
@@ -1,127 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-const LINKIFY_TIMEOUT = 0;
-
-function Linkifier() {
-  this._linkifyTimer = null;
-  this._phoneRegex = /(?:\s|^)[\+]?(\(?\d{1,8}\)?)?([- ]+\(?\d{1,8}\)?)+( ?(x|ext) ?\d{1,3})?(?:\s|$)/g;
-}
-
-Linkifier.prototype = {
-  _buildAnchor: function(aDoc, aNumberText) {
-    let anchorNode = aDoc.createElement("a");
-    let cleanedText = "";
-    for (let i = 0; i < aNumberText.length; i++) {
-      let c = aNumberText.charAt(i);
-      if ((c >= "0" && c <= "9") || c == "+") {
-        // assuming there is only the leading '+'.
-        cleanedText += c;
-      }
-    }
-    anchorNode.setAttribute("href", "tel:" + cleanedText);
-    let nodeText = aDoc.createTextNode(aNumberText);
-    anchorNode.appendChild(nodeText);
-    return anchorNode;
-  },
-
-  _linkifyNodeNumbers: function(aNodeToProcess, aDoc) {
-    let parent = aNodeToProcess.parentNode;
-    let nodeText = aNodeToProcess.nodeValue;
-
-    // Replacing the original text node with a sequence of
-    // |text before number|anchor with number|text after number nodes.
-    // Each step a couple of (optional) text node and anchor node are appended.
-    let anchorNode = null;
-    let m = null;
-    let startIndex = 0;
-    let prevNode = null;
-    while ((m = this._phoneRegex.exec(nodeText))) {
-      anchorNode = this._buildAnchor(
-        aDoc,
-        nodeText.substr(m.index, m[0].length)
-      );
-
-      let textExistsBeforeNumber = m.index > startIndex;
-      let nodeToAdd = null;
-      if (textExistsBeforeNumber) {
-        nodeToAdd = aDoc.createTextNode(
-          nodeText.substr(startIndex, m.index - startIndex)
-        );
-      } else {
-        nodeToAdd = anchorNode;
-      }
-
-      if (!prevNode) {
-        // first time, need to replace the whole node with the first new one.
-        parent.replaceChild(nodeToAdd, aNodeToProcess);
-      } else {
-        parent.insertBefore(nodeToAdd, prevNode.nextSibling);
-      } // inserts after.
-
-      if (textExistsBeforeNumber) {
-        // if we added the text node before the anchor, we still need to add the anchor node.
-        parent.insertBefore(anchorNode, nodeToAdd.nextSibling);
-      }
-
-      // next nodes need to be appended to this node.
-      prevNode = anchorNode;
-      startIndex = m.index + m[0].length;
-    }
-
-    // if some text is remaining after the last anchor.
-    if (startIndex > 0 && startIndex < nodeText.length) {
-      let lastNode = aDoc.createTextNode(nodeText.substr(startIndex));
-      parent.insertBefore(lastNode, prevNode.nextSibling);
-      return lastNode;
-    }
-    return anchorNode;
-  },
-
-  linkifyNumbers: function(aDoc) {
-    // Removing any installed timer in case the page has changed and a previous timer is still running.
-    if (this._linkifyTimer) {
-      clearTimeout(this._linkifyTimer);
-      this._linkifyTimer = null;
-    }
-
-    let filterNode = function(node) {
-      if (
-        node.parentNode.tagName != "A" &&
-        node.parentNode.tagName != "SCRIPT" &&
-        node.parentNode.tagName != "NOSCRIPT" &&
-        node.parentNode.tagName != "STYLE" &&
-        node.parentNode.tagName != "APPLET" &&
-        node.parentNode.tagName != "TEXTAREA"
-      ) {
-        return NodeFilter.FILTER_ACCEPT;
-      }
-      return NodeFilter.FILTER_REJECT;
-    };
-
-    let nodeWalker = aDoc.createTreeWalker(
-      aDoc.body,
-      NodeFilter.SHOW_TEXT,
-      filterNode,
-      false
-    );
-    let parseNode = () => {
-      let node = nodeWalker.nextNode();
-      if (!node) {
-        this._linkifyTimer = null;
-        return;
-      }
-      let lastAddedNode = this._linkifyNodeNumbers(node, aDoc);
-      // we assign a different timeout whether the node was processed or not.
-      if (lastAddedNode) {
-        nodeWalker.currentNode = lastAddedNode;
-        this._linkifyTimer = setTimeout(parseNode, LINKIFY_TIMEOUT);
-      } else {
-        this._linkifyTimer = setTimeout(parseNode, LINKIFY_TIMEOUT);
-      }
-    };
-
-    this._linkifyTimer = setTimeout(parseNode, LINKIFY_TIMEOUT);
-  },
-};
diff --git a/mobile/android/chrome/content/MasterPassword.js b/mobile/android/chrome/content/MasterPassword.js
deleted file mode 100644
index 19039a9cd065..000000000000
--- a/mobile/android/chrome/content/MasterPassword.js
+++ /dev/null
@@ -1,62 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Snackbars",
-  "resource://gre/modules/Snackbars.jsm"
-);
-
-var MasterPassword = {
-  pref: "privacy.masterpassword.enabled",
-
-  get _pk11DB() {
-    delete this._pk11DB;
-    return (this._pk11DB = Cc["@mozilla.org/security/pk11tokendb;1"].getService(
-      Ci.nsIPK11TokenDB
-    ));
-  },
-
-  get enabled() {
-    let token = this._pk11DB.getInternalKeyToken();
-    if (token) {
-      return token.hasPassword;
-    }
-    return false;
-  },
-
-  setPassword: function setPassword(aPassword) {
-    try {
-      let token = this._pk11DB.getInternalKeyToken();
-      if (token.needsUserInit) {
-        token.initPassword(aPassword);
-      } else if (!token.needsLogin()) {
-        token.changePassword("", aPassword);
-      }
-
-      return true;
-    } catch (e) {
-      dump("MasterPassword.setPassword: " + e);
-    }
-    return false;
-  },
-
-  removePassword: function removePassword(aOldPassword) {
-    try {
-      let token = this._pk11DB.getInternalKeyToken();
-      if (token.checkPassword(aOldPassword)) {
-        token.changePassword(aOldPassword, "");
-        return true;
-      }
-    } catch (e) {
-      dump("MasterPassword.removePassword: " + e + "\n");
-    }
-    Snackbars.show(
-      Strings.browser.GetStringFromName("masterPassword.incorrect"),
-      Snackbars.LENGTH_LONG
-    );
-    return false;
-  },
-};
diff --git a/mobile/android/chrome/content/MemoryObserver.js b/mobile/android/chrome/content/MemoryObserver.js
deleted file mode 100644
index 2563a8b8ee77..000000000000
--- a/mobile/android/chrome/content/MemoryObserver.js
+++ /dev/null
@@ -1,89 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-const MAX_CONTENT_VIEWERS_PREF = "browser.sessionhistory.max_total_viewers";
-
-var MemoryObserver = {
-  // When we turn off the bfcache by overwriting the old default value, we want
-  // to be able to restore it later on if memory pressure decreases again.
-  _defaultMaxContentViewers: -1,
-
-  observe: function mo_observe(aSubject, aTopic, aData) {
-    if (aTopic == "memory-pressure") {
-      if (aData != "heap-minimize") {
-        this.handleLowMemory();
-      }
-      // The JS engine would normally GC on this notification, but since we
-      // disabled that in favor of this method (bug 669346), we should gc here.
-      // See bug 784040 for when this code was ported from XUL to native Fennec.
-      this.gc();
-    } else if (aTopic == "memory-pressure-stop") {
-      this.handleEnoughMemory();
-    } else if (aTopic == "Memory:Dump") {
-      this.dumpMemoryStats(aData);
-    }
-  },
-
-  handleLowMemory: function() {
-    // do things to reduce memory usage here
-    if (
-      !Services.prefs.getBoolPref("browser.tabs.disableBackgroundZombification")
-    ) {
-      let tabs = BrowserApp.tabs;
-      let selected = BrowserApp.selectedTab;
-      for (let i = 0; i < tabs.length; i++) {
-        if (tabs[i] != selected && !tabs[i].playingAudio) {
-          tabs[i].zombify();
-        }
-      }
-    }
-
-    // Change some preferences temporarily for only this session
-    let defaults = Services.prefs.getDefaultBranch(null);
-
-    // Stop using the bfcache
-    if (
-      !Services.prefs.getBoolPref(
-        "browser.sessionhistory.bfcacheIgnoreMemoryPressure"
-      )
-    ) {
-      this._defaultMaxContentViewers = defaults.getIntPref(
-        MAX_CONTENT_VIEWERS_PREF
-      );
-      defaults.setIntPref(MAX_CONTENT_VIEWERS_PREF, 0);
-    }
-  },
-
-  handleEnoughMemory: function() {
-    // Re-enable the bfcache
-    let defaults = Services.prefs.getDefaultBranch(null);
-    if (
-      !Services.prefs.getBoolPref(
-        "browser.sessionhistory.bfcacheIgnoreMemoryPressure"
-      )
-    ) {
-      defaults.setIntPref(
-        MAX_CONTENT_VIEWERS_PREF,
-        this._defaultMaxContentViewers
-      );
-    }
-  },
-
-  gc: function() {
-    window.windowUtils.garbageCollect();
-    Cu.forceGC();
-  },
-
-  dumpMemoryStats: function(aLabel) {
-    let memDumper = Cc["@mozilla.org/memory-info-dumper;1"].getService(
-      Ci.nsIMemoryInfoDumper
-    );
-    memDumper.dumpMemoryInfoToTempDir(
-      aLabel,
-      /* anonymize = */ false,
-      /* minimize = */ false
-    );
-  },
-};
diff --git a/mobile/android/chrome/content/OfflineApps.js b/mobile/android/chrome/content/OfflineApps.js
deleted file mode 100644
index e6187d87ca32..000000000000
--- a/mobile/android/chrome/content/OfflineApps.js
+++ /dev/null
@@ -1,53 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-var OfflineApps = {
-  allowSite: function(aDocument) {
-    Services.perms.addFromPrincipal(
-      aDocument.nodePrincipal,
-      "offline-app",
-      Services.perms.ALLOW_ACTION
-    );
-
-    // When a site is enabled while loading, manifest resources will
-    // start fetching immediately.  This one time we need to do it
-    // ourselves.
-    this._startFetching(aDocument);
-  },
-
-  disallowSite: function(aDocument) {
-    Services.perms.addFromPrincipal(
-      aDocument.nodePrincipal,
-      "offline-app",
-      Services.perms.DENY_ACTION
-    );
-  },
-
-  _startFetching: function(aDocument) {
-    if (!aDocument.documentElement) {
-      return;
-    }
-
-    let manifest = aDocument.documentElement.getAttribute("manifest");
-    if (!manifest) {
-      return;
-    }
-
-    let manifestURI = Services.io.newURI(
-      manifest,
-      aDocument.characterSet,
-      aDocument.documentURIObject
-    );
-    let updateService = Cc[
-      "@mozilla.org/offlinecacheupdate-service;1"
-    ].getService(Ci.nsIOfflineCacheUpdateService);
-    updateService.scheduleUpdate(
-      manifestURI,
-      aDocument.documentURIObject,
-      aDocument.nodePrincipal,
-      window
-    );
-  },
-};
diff --git a/mobile/android/chrome/content/PermissionsHelper.js b/mobile/android/chrome/content/PermissionsHelper.js
deleted file mode 100644
index 39556e756c84..000000000000
--- a/mobile/android/chrome/content/PermissionsHelper.js
+++ /dev/null
@@ -1,204 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-var PermissionsHelper = {
-  _permissonTypes: [
-    "password",
-    "geolocation",
-    "popup",
-    "indexedDB",
-    "offline-app",
-    "desktop-notification",
-    "plugins",
-    "native-intent",
-  ],
-  _permissionStrings: {
-    password: {
-      label: "password.logins",
-      allowed: "password.save",
-      denied: "password.dontSave",
-    },
-    geolocation: {
-      label: "geolocation.location",
-      allowed: "geolocation.allow",
-      denied: "geolocation.dontAllow",
-    },
-    popup: {
-      label: "blockPopups.label2",
-      allowed: "popup.show",
-      denied: "popup.dontShow",
-    },
-    indexedDB: {
-      label: "offlineApps.offlineData",
-      allowed: "offlineApps.allow",
-      denied: "offlineApps.dontAllow2",
-    },
-    "offline-app": {
-      label: "offlineApps.offlineData",
-      allowed: "offlineApps.allow",
-      denied: "offlineApps.dontAllow2",
-    },
-    "desktop-notification": {
-      label: "desktopNotification.notifications",
-      allowed: "desktopNotification2.allow",
-      denied: "desktopNotification2.dontAllow",
-    },
-    plugins: {
-      label: "clickToPlayPlugins.plugins",
-      allowed: "clickToPlayPlugins.activate",
-      denied: "clickToPlayPlugins.dontActivate",
-    },
-    "native-intent": {
-      label: "helperapps.openWithList2",
-      allowed: "helperapps.always",
-      denied: "helperapps.never",
-    },
-  },
-
-  onEvent: function onEvent(event, data, callback) {
-    let principal = BrowserApp.selectedBrowser.contentPrincipal;
-    let check = false;
-
-    switch (event) {
-      case "Permissions:Check":
-        check = true;
-      // fall-through
-
-      case "Permissions:Get":
-        let permissions = [];
-        for (let i = 0; i < this._permissonTypes.length; i++) {
-          let type = this._permissonTypes[i];
-          let value = this.getPermission(principal, type);
-
-          // Only add the permission if it was set by the user
-          if (value == Services.perms.UNKNOWN_ACTION) {
-            continue;
-          }
-
-          if (check) {
-            GlobalEventDispatcher.sendRequest({
-              type: "Permissions:CheckResult",
-              hasPermissions: true,
-            });
-            return;
-          }
-          // Get the strings that correspond to the permission type
-          let typeStrings = this._permissionStrings[type];
-          let label = Strings.browser.GetStringFromName(typeStrings.label);
-
-          // Get the key to look up the appropriate string entity
-          let valueKey =
-            value == Services.perms.ALLOW_ACTION ? "allowed" : "denied";
-          let valueString = Strings.browser.GetStringFromName(
-            typeStrings[valueKey]
-          );
-
-          permissions.push({
-            type: type,
-            setting: label,
-            value: valueString,
-          });
-        }
-
-        if (check) {
-          GlobalEventDispatcher.sendRequest({
-            type: "Permissions:CheckResult",
-            hasPermissions: false,
-          });
-          return;
-        }
-
-        // Keep track of permissions, so we know which ones to clear
-        this._currentPermissions = permissions;
-
-        WindowEventDispatcher.sendRequest({
-          type: "Permissions:Data",
-          permissions: permissions,
-        });
-        break;
-
-      case "Permissions:Clear":
-        // An array of the indices of the permissions we want to clear
-        let permissionsToClear = data.permissions;
-        let privacyContext = BrowserApp.selectedBrowser.docShell.QueryInterface(
-          Ci.nsILoadContext
-        );
-
-        for (let i = 0; i < permissionsToClear.length; i++) {
-          let indexToClear = permissionsToClear[i];
-          let permissionType = this._currentPermissions[indexToClear].type;
-          this.clearPermission(uri, permissionType, privacyContext);
-        }
-        break;
-    }
-  },
-
-  /**
-   * Gets the permission value stored for a specified permission type.
-   *
-   * @param aType
-   *        The permission type string stored in permission manager.
-   *        e.g. "geolocation", "indexedDB", "popup"
-   *
-   * @return A permission value defined in nsIPermissionManager.
-   */
-  getPermission: function getPermission(aPrincipal, aType) {
-    let aURI = BrowserApp.selectedBrowser.lastURI;
-    // Password saving isn't a nsIPermissionManager permission type, so handle
-    // it seperately.
-    if (aType == "password") {
-      // By default, login saving is enabled, so if it is disabled, the
-      // user selected the never remember option
-      if (!Services.logins.getLoginSavingEnabled(aURI.displayPrePath)) {
-        return Services.perms.DENY_ACTION;
-      }
-
-      // Check to see if the user ever actually saved a login
-      if (Services.logins.countLogins(aURI.displayPrePath, "", "")) {
-        return Services.perms.ALLOW_ACTION;
-      }
-
-      return Services.perms.UNKNOWN_ACTION;
-    }
-
-    // Geolocation consumers use testExactPermissionForPrincipal
-    if (aType == "geolocation") {
-      return Services.perms.testExactPermissionFromPrincipal(aPrincipal, aType);
-    }
-
-    return Services.perms.testPermissionFromPrincipal(aPrincipal, aType);
-  },
-
-  /**
-   * Clears a user-set permission value for the site given a permission type.
-   *
-   * @param aType
-   *        The permission type string stored in permission manager.
-   *        e.g. "geolocation", "indexedDB", "popup"
-   */
-  clearPermission: function clearPermission(aPrincipal, aType, aContext) {
-    // Password saving isn't a nsIPermissionManager permission type, so handle
-    // it seperately.
-    if (aType == "password") {
-      // Get rid of exisiting stored logings
-      let logins = Services.logins.findLogins(aURI.displayPrePath, "", "");
-      for (let i = 0; i < logins.length; i++) {
-        Services.logins.removeLogin(logins[i]);
-      }
-      // Re-set login saving to enabled
-      Services.logins.setLoginSavingEnabled(aURI.displayPrePath, true);
-    } else {
-      Services.perms.removeFromPrincipal(aPrincipal, aType);
-      // Clear content prefs set in ContentPermissionPrompt.js
-      Cc["@mozilla.org/content-pref/service;1"]
-        .getService(Ci.nsIContentPrefService2)
-        .removeByDomainAndName(
-          aURI.spec,
-          aType + ".request.remember",
-          aContext
-        );
-    }
-  },
-};
diff --git a/mobile/android/chrome/content/PresentationView.js b/mobile/android/chrome/content/PresentationView.js
deleted file mode 100644
index 816cfa5b9825..000000000000
--- a/mobile/android/chrome/content/PresentationView.js
+++ /dev/null
@@ -1,64 +0,0 @@
-/* -*- Mode: tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set ts=8 sts=2 et sw=2 tw=80: */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-const TOPIC_PRESENTATION_VIEW_READY = "presentation-view-ready";
-const TOPIC_PRESENTATION_RECEIVER_LAUNCH = "presentation-receiver:launch";
-const TOPIC_PRESENTATION_RECEIVER_LAUNCH_RESPONSE =
-  "presentation-receiver:launch:response";
-
-// globals Services
-const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
-
-function log(str) {
-  // dump("-*- PresentationView.js -*-: " + str + "\n");
-}
-
-let PresentationView = {
-  _id: null,
-
-  startup: function startup() {
-    // use hash as the ID of this top level window
-    this._id = window.location.hash.substr(1);
-
-    // Listen "presentation-receiver:launch" sent from
-    // PresentationRequestUIGlue.
-    Services.obs.addObserver(this, TOPIC_PRESENTATION_RECEIVER_LAUNCH);
-
-    // Notify PresentationView is ready.
-    Services.obs.notifyObservers(null, TOPIC_PRESENTATION_VIEW_READY, this._id);
-  },
-
-  stop: function stop() {
-    Services.obs.removeObserver(this, TOPIC_PRESENTATION_RECEIVER_LAUNCH);
-  },
-
-  observe: function observe(aSubject, aTopic, aData) {
-    log("Got observe: aTopic=" + aTopic);
-
-    let requestData = JSON.parse(aData);
-    if (this._id != requestData.windowId) {
-      return;
-    }
-
-    let browser = document.getElementById("content");
-    browser.setAttribute("mozpresentation", requestData.url);
-    try {
-      browser.loadURI(requestData.url);
-      Services.obs.notifyObservers(
-        browser,
-        TOPIC_PRESENTATION_RECEIVER_LAUNCH_RESPONSE,
-        JSON.stringify({ result: "success", requestId: requestData.requestId })
-      );
-    } catch (e) {
-      Services.obs.notifyObservers(
-        null,
-        TOPIC_PRESENTATION_RECEIVER_LAUNCH_RESPONSE,
-        JSON.stringify({ result: "error", reason: e.message })
-      );
-    }
-  },
-};
diff --git a/mobile/android/chrome/content/PresentationView.xul b/mobile/android/chrome/content/PresentationView.xul
deleted file mode 100644
index a51ac1673fdb..000000000000
--- a/mobile/android/chrome/content/PresentationView.xul
+++ /dev/null
@@ -1,15 +0,0 @@
-<?xml version="1.0"?>
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-
-<window id="presentation-window"
-        onload="PresentationView.startup();"
-        onunload="PresentationView.stop();"
-        windowtype="navigator:browser"
-        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
-
-  <browser id="content" type="content" src="about:blank" flex="1"/>
-
-  <script type="application/javascript" src="chrome://browser/content/PresentationView.js"/>
-</window>
diff --git a/mobile/android/chrome/content/PrintHelper.js b/mobile/android/chrome/content/PrintHelper.js
deleted file mode 100644
index 47603d928255..000000000000
--- a/mobile/android/chrome/content/PrintHelper.js
+++ /dev/null
@@ -1,92 +0,0 @@
-// -*- Mode: js; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Snackbars",
-  "resource://gre/modules/Snackbars.jsm"
-);
-
-var PrintHelper = {
-  onEvent: function(event, data, callback) {
-    let browser = BrowserApp.selectedBrowser;
-
-    switch (event) {
-      case "Print:PDF":
-        this.generatePDF(browser).then(
-          data => callback.onSuccess(data),
-          error => callback.onError(error)
-        );
-        break;
-    }
-  },
-
-  generatePDF: function(aBrowser) {
-    // Create the final destination file location
-    let fileName = ContentAreaUtils.getDefaultFileName(
-      aBrowser.contentTitle,
-      aBrowser.currentURI,
-      null,
-      null
-    );
-    fileName = fileName.trim() + ".pdf";
-
-    let file = Services.dirsvc.get("TmpD", Ci.nsIFile);
-    file.append(fileName);
-    file.createUnique(file.NORMAL_FILE_TYPE, parseInt("666", 8));
-
-    let printSettings = Cc[
-      "@mozilla.org/gfx/printsettings-service;1"
-    ].getService(Ci.nsIPrintSettingsService).newPrintSettings;
-    printSettings.printSilent = true;
-    printSettings.showPrintProgress = false;
-    printSettings.printBGImages = false;
-    printSettings.printBGColors = false;
-    printSettings.printToFile = true;
-    printSettings.toFileName = file.path;
-    printSettings.outputFormat = Ci.nsIPrintSettings.kOutputFormatPDF;
-
-    let webBrowserPrint = aBrowser.contentWindow.getInterface(
-      Ci.nsIWebBrowserPrint
-    );
-
-    return new Promise((resolve, reject) => {
-      webBrowserPrint.print(printSettings, {
-        onStateChange: function(webProgress, request, stateFlags, status) {
-          // We get two STATE_START calls, one for STATE_IS_DOCUMENT and one for STATE_IS_NETWORK
-          if (
-            stateFlags & Ci.nsIWebProgressListener.STATE_START &&
-            stateFlags & Ci.nsIWebProgressListener.STATE_IS_NETWORK
-          ) {
-            // Let the user know something is happening. Generating the PDF can take some time.
-            Snackbars.show(
-              Strings.browser.GetStringFromName("alertPrintjobToast"),
-              Snackbars.LENGTH_LONG
-            );
-          }
-
-          // We get two STATE_STOP calls, one for STATE_IS_DOCUMENT and one for STATE_IS_NETWORK
-          if (
-            stateFlags & Ci.nsIWebProgressListener.STATE_STOP &&
-            stateFlags & Ci.nsIWebProgressListener.STATE_IS_NETWORK
-          ) {
-            if (Components.isSuccessCode(status)) {
-              // Send the details to Java
-              resolve({ file: file.path, title: fileName });
-            } else {
-              reject();
-            }
-          }
-        },
-        onProgressChange: function() {},
-        onLocationChange: function() {},
-        onStatusChange: function() {},
-        onSecurityChange: function() {},
-        onContentBlockingEvent: function() {},
-      });
-    });
-  },
-};
diff --git a/mobile/android/chrome/content/Reader.js b/mobile/android/chrome/content/Reader.js
deleted file mode 100644
index 59c15b85e1a8..000000000000
--- a/mobile/android/chrome/content/Reader.js
+++ /dev/null
@@ -1,342 +0,0 @@
-// -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Snackbars",
-  "resource://gre/modules/Snackbars.jsm"
-);
-
-/* globals MAX_URI_LENGTH, MAX_TITLE_LENGTH */
-
-var Reader = {
-  // These values should match those defined in BrowserContract.java.
-  STATUS_UNFETCHED: 0,
-  STATUS_FETCH_FAILED_TEMPORARY: 1,
-  STATUS_FETCH_FAILED_PERMANENT: 2,
-  STATUS_FETCH_FAILED_UNSUPPORTED_FORMAT: 3,
-  STATUS_FETCHED_ARTICLE: 4,
-
-  get _hasUsedToolbar() {
-    delete this._hasUsedToolbar;
-    return (this._hasUsedToolbar = Services.prefs.getBoolPref(
-      "reader.has_used_toolbar"
-    ));
-  },
-
-  /**
-   * BackPressListener (listeners / ReaderView Ids).
-   */
-  _backPressListeners: [],
-  _backPressViewIds: [],
-
-  /**
-   * Set a backPressListener for this tabId / ReaderView Id pair.
-   */
-  _addBackPressListener: function(tabId, viewId, listener) {
-    this._backPressListeners[tabId] = listener;
-    this._backPressViewIds[viewId] = tabId;
-  },
-
-  /**
-   * Remove a backPressListener for this ReaderView Id.
-   */
-  _removeBackPressListener: function(viewId) {
-    let tabId = this._backPressViewIds[viewId];
-    if (tabId != undefined) {
-      this._backPressListeners[tabId] = null;
-      delete this._backPressViewIds[viewId];
-    }
-  },
-
-  /**
-   * If the requested tab has a backPress listener, return its results, else false.
-   */
-  onBackPress: function(tabId) {
-    let listener = this._backPressListeners[tabId];
-    return { handled: listener ? listener() : false };
-  },
-
-  onEvent: function Reader_onEvent(event, data, callback) {
-    switch (event) {
-      case "Reader:RemoveFromCache": {
-        ReaderMode.removeArticleFromCache(data.url).catch(e =>
-          Cu.reportError("Error removing article from cache: " + e)
-        );
-        break;
-      }
-
-      case "Reader:AddToCache": {
-        let tab = BrowserApp.getTabForId(data.tabID);
-        if (!tab) {
-          throw new Error(
-            "No tab for tabID = " +
-              data.tabID +
-              " when trying to save reader view article"
-          );
-        }
-
-        // If the article is coming from reader mode, we must have fetched it already.
-        this._getArticleData(tab.browser)
-          .then(article => {
-            ReaderMode.storeArticleInCache(article);
-          })
-          .catch(e => Cu.reportError("Error storing article in cache: " + e));
-        break;
-      }
-    }
-  },
-
-  receiveMessage: function(message) {
-    switch (message.name) {
-      case "Reader:ArticleGet":
-        this._getArticle(message.data.url).then(
-          article => {
-            // Make sure the target browser is still alive before trying to send data back.
-            if (message.target.messageManager) {
-              message.target.messageManager.sendAsyncMessage(
-                "Reader:ArticleData",
-                { article: article }
-              );
-            }
-          },
-          e => {
-            if (e && e.newURL) {
-              message.target.loadURI(
-                "about:reader?url=" + encodeURIComponent(e.newURL)
-              );
-            }
-          }
-        );
-        break;
-
-      // On DropdownClosed in ReaderView, we cleanup / clear existing BackPressListener.
-      case "Reader:DropdownClosed": {
-        this._removeBackPressListener(message.data);
-        break;
-      }
-
-      // On DropdownOpened in ReaderView, we add BackPressListener to handle a subsequent BACK request.
-      case "Reader:DropdownOpened": {
-        let tabId = BrowserApp.selectedTab.id;
-        this._addBackPressListener(tabId, message.data, () => {
-          // User hit BACK key while ReaderView has the banner font-dropdown opened.
-          // Close it and return prevent-default.
-          if (message.target.messageManager) {
-            message.target.messageManager.sendAsyncMessage(
-              "Reader:CloseDropdown"
-            );
-            return true;
-          }
-          // We can assume ReaderView banner's font-dropdown doesn't need to be closed.
-          return false;
-        });
-
-        break;
-      }
-
-      case "Reader:FaviconRequest": {
-        GlobalEventDispatcher.sendRequestForResult({
-          type: "Reader:FaviconRequest",
-          url: message.data.url,
-        }).then(data => {
-          message.target.messageManager.sendAsyncMessage(
-            "Reader:FaviconReturn",
-            data
-          );
-        });
-        break;
-      }
-
-      case "Reader:SystemUIVisibility":
-        this._showSystemUI(message.data.visible);
-        break;
-
-      case "Reader:ToolbarHidden":
-        if (!this._hasUsedToolbar) {
-          Snackbars.show(
-            Strings.browser.GetStringFromName("readerMode.toolbarTip"),
-            Snackbars.LENGTH_LONG
-          );
-          Services.prefs.setBoolPref("reader.has_used_toolbar", true);
-          this._hasUsedToolbar = true;
-        }
-        break;
-
-      case "Reader:UpdateReaderButton": {
-        let tab = BrowserApp.getTabForBrowser(message.target);
-        tab.browser.isArticle = message.data.isArticle;
-        this.updatePageAction(tab);
-        break;
-      }
-    }
-  },
-
-  pageAction: {
-    readerModeCallback: function(browser) {
-      let url = browser.currentURI.spec;
-      if (url.startsWith("about:reader")) {
-        UITelemetry.addEvent("action.1", "button", null, "reader_exit");
-      } else {
-        UITelemetry.addEvent("action.1", "button", null, "reader_enter");
-      }
-      browser.messageManager.sendAsyncMessage("Reader:ToggleReaderMode");
-    },
-  },
-
-  updatePageAction: function(tab) {
-    if (!tab.getActive()) {
-      return;
-    }
-
-    if (this.pageAction.id) {
-      PageActions.remove(this.pageAction.id);
-      delete this.pageAction.id;
-    }
-
-    let showPageAction = (icon, title, useTint) => {
-      this.pageAction.id = PageActions.add({
-        icon: icon,
-        title: title,
-        clickCallback: () => this.pageAction.readerModeCallback(browser),
-        important: true,
-        useTint: useTint,
-      });
-    };
-
-    let browser = tab.browser;
-    if (browser.currentURI.spec.startsWith("about:reader")) {
-      showPageAction(
-        "drawable://ic_readermode_on",
-        Strings.reader.GetStringFromName("readerView.close"),
-        false
-      );
-      // Only start a reader session if the viewer is in the foreground. We do
-      // not track background reader viewers.
-      UITelemetry.startSession("reader.1", null);
-      return;
-    }
-
-    // not in ReaderMode, to make sure System UI is visible, not dimmed.
-    this._showSystemUI(true);
-
-    // Only stop a reader session if the foreground viewer is not visible.
-    UITelemetry.stopSession("reader.1", "", null);
-
-    if (browser.isArticle) {
-      showPageAction(
-        "drawable://ic_readermode",
-        Strings.reader.GetStringFromName("readerView.enter"),
-        true
-      );
-      UITelemetry.addEvent("show.1", "button", null, "reader_available");
-      this._sendMmaEvent("reader_available");
-    } else {
-      UITelemetry.addEvent("show.1", "button", null, "reader_unavailable");
-    }
-  },
-
-  _sendMmaEvent: function(event) {
-    WindowEventDispatcher.sendRequest({
-      type: "Mma:" + event,
-    });
-  },
-
-  _showSystemUI: function(visibility) {
-    WindowEventDispatcher.sendRequest({
-      type: "SystemUI:Visibility",
-      visible: visibility,
-    });
-  },
-
-  /**
-   * Gets an article for a given URL. This method will download and parse a document
-   * if it does not find the article in the cache.
-   *
-   * @param url The article URL.
-   * @return {Promise}
-   * @resolves JS object representing the article, or null if no article is found.
-   */
-  async _getArticle(url) {
-    // First try to find a parsed article in the cache.
-    let article = await ReaderMode.getArticleFromCache(url);
-    if (article) {
-      return article;
-    }
-
-    // Article hasn't been found in the cache, we need to
-    // download the page and parse the article out of it.
-    return ReaderMode.downloadAndParseDocument(url).catch(e => {
-      if (e && e.newURL) {
-        // Pass up the error so we can navigate the browser in question to the new URL:
-        throw e;
-      }
-      Cu.reportError("Error downloading and parsing document: " + e);
-      return null;
-    });
-  },
-
-  _getArticleData: function(browser) {
-    return new Promise((resolve, reject) => {
-      if (browser == null) {
-        reject("_getArticleData needs valid browser");
-      }
-
-      let mm = browser.messageManager;
-      let listener = message => {
-        mm.removeMessageListener("Reader:StoredArticleData", listener);
-        resolve(message.data.article);
-      };
-      mm.addMessageListener("Reader:StoredArticleData", listener);
-      mm.sendAsyncMessage("Reader:GetStoredArticleData");
-    });
-  },
-
-  /**
-   * Migrates old indexedDB reader mode cache to new JSON cache.
-   */
-  async migrateCache() {
-    let cacheDB = await new Promise((resolve, reject) => {
-      let request = window.indexedDB.open("about:reader", 1);
-      request.onsuccess = event => resolve(event.target.result);
-      request.onerror = event => reject(request.error);
-
-      // If there is no DB to migrate, don't do anything.
-      request.onupgradeneeded = event => resolve(null);
-    });
-
-    if (!cacheDB) {
-      return;
-    }
-
-    let articles = await new Promise((resolve, reject) => {
-      let articles = [];
-
-      let transaction = cacheDB.transaction(cacheDB.objectStoreNames);
-      let store = transaction.objectStore(cacheDB.objectStoreNames[0]);
-
-      let request = store.openCursor();
-      request.onsuccess = event => {
-        let cursor = event.target.result;
-        if (!cursor) {
-          resolve(articles);
-        } else {
-          articles.push(cursor.value);
-          cursor.continue();
-        }
-      };
-      request.onerror = event => reject(request.error);
-    });
-
-    for (let article of articles) {
-      await ReaderMode.storeArticleInCache(article);
-    }
-
-    // Delete the database.
-    window.indexedDB.deleteDatabase("about:reader");
-  },
-};
diff --git a/mobile/android/chrome/content/RemoteDebugger.js b/mobile/android/chrome/content/RemoteDebugger.js
deleted file mode 100644
index 58f8bed87b3e..000000000000
--- a/mobile/android/chrome/content/RemoteDebugger.js
+++ /dev/null
@@ -1,406 +0,0 @@
-// -*- Mode: js; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-/* globals DebuggerServer */
-"use strict";
-
-XPCOMUtils.defineLazyGetter(this, "require", () => {
-  let { require } = ChromeUtils.import("resource://devtools/shared/Loader.jsm");
-  return require;
-});
-
-XPCOMUtils.defineLazyGetter(this, "DebuggerServer", () => {
-  let { DebuggerServer } = require("devtools/server/debugger-server");
-  return DebuggerServer;
-});
-XPCOMUtils.defineLazyGetter(this, "SocketListener", () => {
-  let { SocketListener } = require("devtools/shared/security/socket");
-  return SocketListener;
-});
-
-var RemoteDebugger = {
-  init(aWindow) {
-    this._windowType = "navigator:browser";
-
-    USBRemoteDebugger.init();
-    WiFiRemoteDebugger.init();
-
-    const listener = event => {
-      if (event.target !== aWindow) {
-        return;
-      }
-
-      const newType =
-        event.type === "activate" ? "navigator:browser" : "navigator:geckoview";
-      if (this._windowType === newType) {
-        return;
-      }
-
-      this._windowType = newType;
-      if (this.isAnyEnabled) {
-        this.initServer();
-      }
-    };
-    aWindow.addEventListener("activate", listener, { mozSystemGroup: true });
-    aWindow.addEventListener("deactivate", listener, { mozSystemGroup: true });
-  },
-
-  get isAnyEnabled() {
-    return USBRemoteDebugger.isEnabled || WiFiRemoteDebugger.isEnabled;
-  },
-
-  /**
-   * Prompt the user to accept or decline the incoming connection.
-   *
-   * @param session object
-   *        The session object will contain at least the following fields:
-   *        {
-   *          authentication,
-   *          client: {
-   *            host,
-   *            port
-   *          },
-   *          server: {
-   *            host,
-   *            port
-   *          }
-   *        }
-   *        Specific authentication modes may include additional fields.  Check
-   *        the different |allowConnection| methods in
-   *        devtools/shared/security/auth.js.
-   * @return An AuthenticationResult value.
-   *         A promise that will be resolved to the above is also allowed.
-   */
-  allowConnection(session) {
-    if (this._promptingForAllow) {
-      // Don't stack connection prompts if one is already open
-      return DebuggerServer.AuthenticationResult.DENY;
-    }
-
-    if (!session.server.port) {
-      this._promptingForAllow = this._promptForUSB(session);
-    } else {
-      this._promptingForAllow = this._promptForTCP(session);
-    }
-    this._promptingForAllow.then(() => (this._promptingForAllow = null));
-
-    return this._promptingForAllow;
-  },
-
-  _promptForUSB(session) {
-    if (session.authentication !== "PROMPT") {
-      // This dialog is not prepared for any other authentication method at
-      // this time.
-      return DebuggerServer.AuthenticationResult.DENY;
-    }
-
-    return new Promise(resolve => {
-      let title = Strings.browser.GetStringFromName(
-        "remoteIncomingPromptTitle"
-      );
-      let msg = Strings.browser.GetStringFromName("remoteIncomingPromptUSB");
-      let allow = Strings.browser.GetStringFromName(
-        "remoteIncomingPromptAllow"
-      );
-      let deny = Strings.browser.GetStringFromName("remoteIncomingPromptDeny");
-
-      // Make prompt. Note: button order is in reverse.
-      let prompt = new Prompt({
-        window: null,
-        hint: "remotedebug",
-        title: title,
-        message: msg,
-        buttons: [allow, deny],
-        priority: 1,
-      });
-
-      prompt.show(data => {
-        let result = data.button;
-        if (result === 0) {
-          resolve(DebuggerServer.AuthenticationResult.ALLOW);
-        } else {
-          resolve(DebuggerServer.AuthenticationResult.DENY);
-        }
-      });
-    });
-  },
-
-  _promptForTCP(session) {
-    if (session.authentication !== "OOB_CERT" || !session.client.cert) {
-      // This dialog is not prepared for any other authentication method at
-      // this time.
-      return DebuggerServer.AuthenticationResult.DENY;
-    }
-
-    return new Promise(resolve => {
-      let title = Strings.browser.GetStringFromName(
-        "remoteIncomingPromptTitle"
-      );
-      let msg = Strings.browser.formatStringFromName(
-        "remoteIncomingPromptTCP",
-        [session.client.host, session.client.port]
-      );
-      let scan = Strings.browser.GetStringFromName("remoteIncomingPromptScan");
-      let scanAndRemember = Strings.browser.GetStringFromName(
-        "remoteIncomingPromptScanAndRemember"
-      );
-      let deny = Strings.browser.GetStringFromName("remoteIncomingPromptDeny");
-
-      // Make prompt. Note: button order is in reverse.
-      let prompt = new Prompt({
-        window: null,
-        hint: "remotedebug",
-        title: title,
-        message: msg,
-        buttons: [scan, scanAndRemember, deny],
-        priority: 1,
-      });
-
-      prompt.show(data => {
-        let result = data.button;
-        if (result === 0) {
-          resolve(DebuggerServer.AuthenticationResult.ALLOW);
-        } else if (result === 1) {
-          resolve(DebuggerServer.AuthenticationResult.ALLOW_PERSIST);
-        } else {
-          resolve(DebuggerServer.AuthenticationResult.DENY);
-        }
-      });
-    });
-  },
-
-  /**
-   * During OOB_CERT authentication, the user must transfer some data through
-   * some out of band mechanism from the client to the server to authenticate
-   * the devices.
-   *
-   * This implementation instructs Fennec to invoke a QR decoder and return the
-   * the data it contains back here.
-   *
-   * @return An object containing:
-   *         * sha256: hash(ClientCert)
-   *         * k     : K(random 128-bit number)
-   *         A promise that will be resolved to the above is also allowed.
-   */
-  receiveOOB() {
-    if (this._receivingOOB) {
-      return this._receivingOOB;
-    }
-
-    this._receivingOOB = WindowEventDispatcher.sendRequestForResult({
-      type: "DevToolsAuth:Scan",
-    }).then(
-      data => {
-        return JSON.parse(data);
-      },
-      () => {
-        let title = Strings.browser.GetStringFromName(
-          "remoteQRScanFailedPromptTitle"
-        );
-        let msg = Strings.browser.GetStringFromName(
-          "remoteQRScanFailedPromptMessage"
-        );
-        let ok = Strings.browser.GetStringFromName(
-          "remoteQRScanFailedPromptOK"
-        );
-        let prompt = new Prompt({
-          window: null,
-          hint: "remotedebug",
-          title: title,
-          message: msg,
-          buttons: [ok],
-          priority: 1,
-        });
-        prompt.show();
-      }
-    );
-
-    this._receivingOOB.then(() => (this._receivingOOB = null));
-
-    return this._receivingOOB;
-  },
-
-  initServer: function() {
-    DebuggerServer.init();
-
-    // Add browser and Fennec specific actors
-    DebuggerServer.registerAllActors();
-    const {
-      createRootActor,
-    } = require("resource://gre/modules/dbg-browser-actors.js");
-    DebuggerServer.setRootActor(createRootActor);
-
-    // Allow debugging of chrome for any process
-    DebuggerServer.allowChromeProcess = true;
-    DebuggerServer.chromeWindowType = this._windowType;
-    // Force the Server to stay alive even if there are no connections at the moment.
-    DebuggerServer.keepAlive = true;
-  },
-};
-
-RemoteDebugger.allowConnection = RemoteDebugger.allowConnection.bind(
-  RemoteDebugger
-);
-RemoteDebugger.receiveOOB = RemoteDebugger.receiveOOB.bind(RemoteDebugger);
-
-var USBRemoteDebugger = {
-  init() {
-    Services.prefs.addObserver("devtools.", this);
-
-    if (this.isEnabled) {
-      this.start();
-    }
-  },
-
-  observe(subject, topic, data) {
-    if (topic != "nsPref:changed") {
-      return;
-    }
-
-    switch (data) {
-      case "devtools.remote.usb.enabled":
-        Services.prefs.setBoolPref(
-          "devtools.debugger.remote-enabled",
-          RemoteDebugger.isAnyEnabled
-        );
-        if (this.isEnabled) {
-          this.start();
-        } else {
-          this.stop();
-        }
-        break;
-
-      case "devtools.debugger.remote-port":
-      case "devtools.debugger.unix-domain-socket":
-        if (this.isEnabled) {
-          this.stop();
-          this.start();
-        }
-        break;
-    }
-  },
-
-  get isEnabled() {
-    return Services.prefs.getBoolPref("devtools.remote.usb.enabled");
-  },
-
-  start: function() {
-    if (this._listener) {
-      return;
-    }
-
-    RemoteDebugger.initServer();
-
-    const portOrPath =
-      Services.prefs.getCharPref("devtools.debugger.unix-domain-socket") ||
-      Services.prefs.getIntPref("devtools.debugger.remote-port");
-
-    try {
-      dump("Starting USB debugger on " + portOrPath);
-      const AuthenticatorType = DebuggerServer.Authenticators.get("PROMPT");
-      const authenticator = new AuthenticatorType.Server();
-      authenticator.allowConnection = RemoteDebugger.allowConnection;
-      const socketOptions = { authenticator, portOrPath };
-      this._listener = new SocketListener(DebuggerServer, socketOptions);
-      this._listener.open();
-    } catch (e) {
-      dump("Unable to start USB debugger server: " + e);
-    }
-  },
-
-  stop: function() {
-    if (!this._listener) {
-      return;
-    }
-
-    try {
-      this._listener.close();
-      this._listener = null;
-    } catch (e) {
-      dump("Unable to stop USB debugger server: " + e);
-    }
-  },
-};
-
-var WiFiRemoteDebugger = {
-  init() {
-    Services.prefs.addObserver("devtools.", this);
-
-    if (this.isEnabled) {
-      this.start();
-    }
-  },
-
-  observe(subject, topic, data) {
-    if (topic != "nsPref:changed") {
-      return;
-    }
-
-    switch (data) {
-      case "devtools.remote.wifi.enabled":
-        Services.prefs.setBoolPref(
-          "devtools.debugger.remote-enabled",
-          RemoteDebugger.isAnyEnabled
-        );
-        // Allow remote debugging on non-local interfaces when WiFi debug is
-        // enabled
-        // TODO: Bug 1034411: Lock down to WiFi interface only
-        Services.prefs.setBoolPref(
-          "devtools.debugger.force-local",
-          !this.isEnabled
-        );
-        if (this.isEnabled) {
-          this.start();
-        } else {
-          this.stop();
-        }
-        break;
-    }
-  },
-
-  get isEnabled() {
-    return Services.prefs.getBoolPref("devtools.remote.wifi.enabled");
-  },
-
-  start: function() {
-    if (this._listener) {
-      return;
-    }
-
-    RemoteDebugger.initServer();
-
-    try {
-      dump("Starting WiFi debugger");
-      const AuthenticatorType = DebuggerServer.Authenticators.get("OOB_CERT");
-      const authenticator = new AuthenticatorType.Server();
-      authenticator.allowConnection = RemoteDebugger.allowConnection;
-      authenticator.receiveOOB = RemoteDebugger.receiveOOB;
-      const socketOptions = {
-        authenticator,
-        discoverable: true,
-        encryption: true,
-        portOrPath: -1,
-      };
-      this._listener = new SocketListener(DebuggerServer, socketOptions);
-      this._listener.open();
-      let port = this._listener.port;
-      dump("Started WiFi debugger on " + port);
-    } catch (e) {
-      dump("Unable to start WiFi debugger server: " + e);
-    }
-  },
-
-  stop: function() {
-    if (!this._listener) {
-      return;
-    }
-
-    try {
-      this._listener.close();
-      this._listener = null;
-    } catch (e) {
-      dump("Unable to stop WiFi debugger server: " + e);
-    }
-  },
-};
diff --git a/mobile/android/chrome/content/about.js b/mobile/android/chrome/content/about.js
deleted file mode 100644
index 92468a86263e..000000000000
--- a/mobile/android/chrome/content/about.js
+++ /dev/null
@@ -1,147 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-const {EventDispatcher} = ChromeUtils.import("resource://gre/modules/Messaging.jsm");
-const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");
-
-function init() {
-  // Include the build date and a warning about Telemetry
-  // if this is an "a#" (nightly or aurora) build
-#expand const version = "__MOZ_APP_VERSION_DISPLAY__";
-  if (/a\d+$/.test(version)) {
-    let buildID = Services.appinfo.appBuildID;
-    let buildDate = buildID.slice(0, 4) + "-" + buildID.slice(4, 6) + "-" + buildID.slice(6, 8);
-    let br = document.createElement("br");
-    let versionPara = document.getElementById("version");
-    versionPara.appendChild(br);
-    let date = document.createTextNode("(" + buildDate + ")");
-    versionPara.appendChild(date);
-    document.getElementById("telemetry").hidden = false;
-  }
-
-  // Include the Distribution information if available
-  try {
-    let distroId = Services.prefs.getCharPref("distribution.id");
-    if (distroId) {
-      let distroVersion = Services.prefs.getCharPref("distribution.version");
-      let distroIdField = document.getElementById("distributionID");
-      distroIdField.textContent = distroId + " - " + distroVersion;
-      distroIdField.hidden = false;
-
-      let distroAbout = Services.prefs.getStringPref("distribution.about");
-      let distroField = document.getElementById("distributionAbout");
-      distroField.textContent = distroAbout;
-      distroField.hidden = false;
-    }
-  } catch (e) {
-    // Pref is unset
-  }
-
-  // get URLs from prefs
-  try {
-    let formatter = Cc["@mozilla.org/toolkit/URLFormatterService;1"].getService(Ci.nsIURLFormatter);
-
-    let links = [
-      {id: "releaseNotesURL", pref: "app.releaseNotesURL"},
-      {id: "supportURL",      pref: "app.supportURL"},
-      {id: "faqURL",          pref: "app.faqURL"},
-      {id: "privacyURL",      pref: "app.privacyURL"},
-      {id: "creditsURL",      pref: "app.creditsURL"},
-    ];
-
-    links.forEach(function(link) {
-      let url = formatter.formatURLPref(link.pref);
-      let element = document.getElementById(link.id);
-      if (element) {
-        element.setAttribute("href", url);
-      }
-    });
-  } catch (ex) {}
-
-#ifdef MOZ_UPDATER
-  function expectUpdateResult() {
-    EventDispatcher.instance.registerListener(function listener(event, data, callback) {
-      EventDispatcher.instance.unregisterListener(listener, event);
-      showUpdateMessage(data.result);
-    }, "Update:CheckResult");
-  }
-
-  function checkForUpdates() {
-    showCheckingMessage();
-    expectUpdateResult();
-
-    EventDispatcher.instance.sendRequest({ type: "Update:Check" });
-  }
-
-  function downloadUpdate() {
-    expectUpdateResult();
-
-    EventDispatcher.instance.sendRequest({ type: "Update:Download" });
-  }
-
-  function installUpdate() {
-    showCheckAction();
-
-    EventDispatcher.instance.sendRequest({ type: "Update:Install" });
-  }
-
-  let updateLink = document.getElementById("updateLink");
-  let checkingSpan = document.getElementById("update-message-checking");
-  let noneSpan = document.getElementById("update-message-none");
-  let foundSpan = document.getElementById("update-message-found");
-  let downloadingSpan = document.getElementById("update-message-downloading");
-  let downloadedSpan = document.getElementById("update-message-downloaded");
-
-  updateLink.onclick = checkForUpdates;
-  foundSpan.onclick = downloadUpdate;
-  downloadedSpan.onclick = installUpdate;
-
-  function showCheckAction() {
-    checkingSpan.style.display = "none";
-    noneSpan.style.display = "none";
-    foundSpan.style.display = "none";
-    downloadingSpan.style.display = "none";
-    downloadedSpan.style.display = "none";
-    updateLink.style.display = "block";
-  }
-
-  function showCheckingMessage() {
-    updateLink.style.display = "none";
-    noneSpan.style.display = "none";
-    foundSpan.style.display = "none";
-    downloadingSpan.style.display = "none";
-    downloadedSpan.style.display = "none";
-    checkingSpan.style.display = "block";
-  }
-
-  function showUpdateMessage(aResult) {
-    updateLink.style.display = "none";
-    checkingSpan.style.display = "none";
-    noneSpan.style.display = "none";
-    foundSpan.style.display = "none";
-    downloadingSpan.style.display = "none";
-    downloadedSpan.style.display = "none";
-
-    // the aResult values come from mobile/android/base/UpdateServiceHelper.java
-    switch (aResult) {
-      case "NOT_AVAILABLE":
-        noneSpan.style.display = "block";
-        setTimeout(showCheckAction, 2000);
-        break;
-      case "AVAILABLE":
-        foundSpan.style.display = "block";
-        break;
-      case "DOWNLOADING":
-        downloadingSpan.style.display = "block";
-        expectUpdateResult();
-        break;
-      case "DOWNLOADED":
-        downloadedSpan.style.display = "block";
-        break;
-    }
-  }
-#endif
-}
-
-document.addEventListener("DOMContentLoaded", init);
diff --git a/mobile/android/chrome/content/about.xhtml b/mobile/android/chrome/content/about.xhtml
deleted file mode 100644
index 6367e2d22467..000000000000
--- a/mobile/android/chrome/content/about.xhtml
+++ /dev/null
@@ -1,80 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!DOCTYPE html [
-<!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd" >
-%brandDTD;
-<!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd">
-%globalDTD;
-<!ENTITY % fennecDTD SYSTEM "chrome://browser/locale/about.dtd">
-%fennecDTD;
-]>
-
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-
-<html xmlns="http://www.w3.org/1999/xhtml">
-<head>
-  <meta name="viewport" content="width=480; initial-scale=.6667; user-scalable=no"/>
-  <title>&aboutPage.title;</title>
-  <link rel="stylesheet" href="chrome://browser/skin/aboutPage.css" type="text/css"/>
-  <link rel="icon" type="image/png" sizes="64x64" href="chrome://branding/content/favicon64.png" />
-</head>
-
-<body dir="&locale.dir;">
-  <div id="header" dir="ltr">
-    <div id="wordmark"></div>
-#expand <p id="version">__MOZ_APP_VERSION_DISPLAY__</p>
-  </div>
-
-  <div id="banner">
-    <div id="logo"/>
-#ifdef MOZ_UPDATER
-    <div id="updateBox">
-      <a id="updateLink" href="">&aboutPage.checkForUpdates.link;</a>
-      <span id="update-message-checking">&aboutPage.checkForUpdates.checking;</span>
-      <span id="update-message-none">&aboutPage.checkForUpdates.none;</span>
-      <span id="update-message-found">&aboutPage.checkForUpdates.available2;</span>
-      <span id="update-message-downloading">&aboutPage.checkForUpdates.downloading;</span>
-      <span id="update-message-downloaded">&aboutPage.checkForUpdates.downloaded2;</span>
-    </div>
-#endif
-
-    <div id="messages">
-      <p id="distributionAbout" hidden="true"/>
-      <p id="distributionID" hidden="true"/>
-      <p id="telemetry" hidden="true">
-        &aboutPage.warningVersion;
-      </p>
-    </div>
-
-  </div>
-
-    <ul id="aboutLinks">
-      <div class="top-border"></div>
-      <li><a id="faqURL">&aboutPage.faq.label;</a></li>
-      <li><a id="supportURL">&aboutPage.support.label;</a></li>
-      <li><a id="privacyURL">&aboutPage.privacyPolicy.label;</a></li>
-      <li><a href="about:rights">&aboutPage.rights.label;</a></li>
-#ifndef NIGHTLY_BUILD
-#ifndef FENNEC_NIGHTLY
-      <li><a id="releaseNotesURL">&aboutPage.relNotes.label;</a></li>
-#endif
-#endif
-      <li><a id="creditsURL">&aboutPage.credits.label;</a></li>
-      <li><a href="about:license">&aboutPage.license.label;</a></li>
-      <div class="bottom-border"></div>
-    </ul>
-
-#ifdef RELEASE_OR_BETA
-#ifndef FENNEC_NIGHTLY
-    <div id="aboutDetails">
-      <p>&aboutPage.logoTrademark;</p>
-    </div>
-#endif
-#endif
-
-    <script type="application/javascript" src="chrome://browser/content/about.js" />
-
-</body>
-</html>
diff --git a/mobile/android/chrome/content/aboutAccounts.js b/mobile/android/chrome/content/aboutAccounts.js
deleted file mode 100644
index 106c7ebcc5a4..000000000000
--- a/mobile/android/chrome/content/aboutAccounts.js
+++ /dev/null
@@ -1,377 +0,0 @@
-// -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-/**
- * Wrap a remote fxa-content-server.
- *
- * An about:accounts tab loads and displays an fxa-content-server page,
- * depending on the current Android Account status and an optional 'action'
- * parameter.
- *
- * We show a spinner while the remote iframe is loading.  We expect the
- * WebChannel message listening to the fxa-content-server to send this tab's
- * <browser>'s messageManager a LOADED message when the remote iframe provides
- * the WebChannel LOADED message.  See the messageManager registration and the
- * |loadedDeferred| promise.  This loosely couples the WebChannel implementation
- * and about:accounts!  (We need this coupling in order to distinguish
- * WebChannel LOADED messages produced by multiple about:accounts tabs.)
- *
- * We capture error conditions by accessing the inner nsIWebNavigation of the
- * iframe directly.
- */
-
-"use strict";
-
-const { Accounts } = ChromeUtils.import("resource://gre/modules/Accounts.jsm");
-const { PromiseUtils } = ChromeUtils.import(
-  "resource://gre/modules/PromiseUtils.jsm"
-);
-const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
-const { XPCOMUtils } = ChromeUtils.import(
-  "resource://gre/modules/XPCOMUtils.jsm"
-);
-
-const ACTION_URL_PARAM = "action";
-
-const COMMAND_LOADED = "fxaccounts:loaded";
-
-const log = ChromeUtils.import(
-  "resource://gre/modules/AndroidLog.jsm",
-  {}
-).AndroidLog.bind("FxAccounts");
-
-XPCOMUtils.defineLazyServiceGetter(
-  this,
-  "ParentalControls",
-  "@mozilla.org/parental-controls-service;1",
-  "nsIParentalControlsService"
-);
-
-// Shows the toplevel element with |id| to be shown - all other top-level
-// elements are hidden.
-// If |id| is 'spinner', then 'remote' is also shown, with opacity 0.
-function show(id) {
-  let allTop = document.querySelectorAll(".toplevel");
-  for (let elt of allTop) {
-    if (elt.getAttribute("id") == id) {
-      elt.style.display = "block";
-    } else {
-      elt.style.display = "none";
-    }
-  }
-  if (id == "spinner") {
-    document.getElementById("remote").style.display = "block";
-    document.getElementById("remote").style.opacity = 0;
-  }
-}
-
-// Each time we try to load the remote <iframe>, loadedDeferred is replaced.  It
-// is resolved by a LOADED message, and rejected by a failure to load.
-var loadedDeferred = null;
-
-// We have a new load starting.  Replace the existing promise with a new one,
-// and queue up the transition to remote content.
-function deferTransitionToRemoteAfterLoaded() {
-  log.d("Waiting for LOADED message.");
-
-  loadedDeferred = PromiseUtils.defer();
-  loadedDeferred.promise
-    .then(() => {
-      log.d("Got LOADED message!");
-      document.getElementById("remote").style.opacity = 0;
-      show("remote");
-      document.getElementById("remote").style.opacity = 1;
-    })
-    .catch(e => {
-      log.w("Did not get LOADED message: " + e.toString());
-    });
-}
-
-function handleLoadedMessage(message) {
-  loadedDeferred.resolve();
-}
-
-var wrapper = {
-  iframe: null,
-
-  url: null,
-
-  init: function(url) {
-    this.url = url;
-    deferTransitionToRemoteAfterLoaded();
-
-    let iframe = document.getElementById("remote");
-    this.iframe = iframe;
-    let docShell = this.iframe.frameLoader.docShell;
-    docShell.QueryInterface(Ci.nsIWebProgress);
-    docShell.addProgressListener(
-      this.iframeListener,
-      Ci.nsIWebProgress.NOTIFY_STATE_DOCUMENT |
-        Ci.nsIWebProgress.NOTIFY_LOCATION
-    );
-
-    // Set the iframe's location with loadURI/LOAD_FLAGS_BYPASS_HISTORY to
-    // avoid having a new history entry being added.
-    let webNav = iframe.frameLoader.docShell.QueryInterface(
-      Ci.nsIWebNavigation
-    );
-    let loadURIOptions = {
-      triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
-      loadFlags: Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_HISTORY,
-    };
-    webNav.loadURI(url, loadURIOptions);
-  },
-
-  retry: function() {
-    deferTransitionToRemoteAfterLoaded();
-
-    let webNav = this.iframe.frameLoader.docShell.QueryInterface(
-      Ci.nsIWebNavigation
-    );
-    let loadURIOptions = {
-      triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
-      loadFlags: Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_HISTORY,
-    };
-    webNav.loadURI(this.url, loadURIOptions);
-  },
-
-  iframeListener: {
-    QueryInterface: ChromeUtils.generateQI([
-      Ci.nsIWebProgressListener,
-      Ci.nsISupportsWeakReference,
-    ]),
-
-    onStateChange: function(aWebProgress, aRequest, aState, aStatus) {
-      let failure = false;
-
-      // Captive portals sometimes redirect users
-      if (aState & Ci.nsIWebProgressListener.STATE_REDIRECTING) {
-        failure = true;
-      } else if (aState & Ci.nsIWebProgressListener.STATE_STOP) {
-        if (aRequest instanceof Ci.nsIHttpChannel) {
-          try {
-            failure = aRequest.responseStatus != 200;
-          } catch (e) {
-            failure = aStatus != Cr.NS_OK;
-          }
-        }
-      }
-
-      // Calling cancel() will raise some OnStateChange notifications by itself,
-      // so avoid doing that more than once
-      if (failure && aStatus != Cr.NS_BINDING_ABORTED) {
-        aRequest.cancel(Cr.NS_BINDING_ABORTED);
-        // Since after a promise is fulfilled, subsequent fulfillments are
-        // treated as no-ops, we don't care that we might see multiple failures
-        // due to multiple listener callbacks.  (It's not easy to extract this
-        // from the Promises spec, but it is widely quoted.  Start with
-        // http://stackoverflow.com/a/18218542.)
-        loadedDeferred.reject(new Error("Failed in onStateChange!"));
-        show("networkError");
-      }
-    },
-
-    onLocationChange: function(aWebProgress, aRequest, aLocation, aFlags) {
-      if (
-        aRequest &&
-        aFlags & Ci.nsIWebProgressListener.LOCATION_CHANGE_ERROR_PAGE
-      ) {
-        aRequest.cancel(Cr.NS_BINDING_ABORTED);
-        // As above, we're not concerned by multiple listener callbacks.
-        loadedDeferred.reject(new Error("Failed in onLocationChange!"));
-        show("networkError");
-      }
-    },
-  },
-};
-
-function retry() {
-  log.i("Retrying.");
-  show("spinner");
-  wrapper.retry();
-}
-
-function openPrefs() {
-  log.i("Opening Sync preferences.");
-  // If an Android Account exists, this will open the Status Activity.
-  // Otherwise, it will begin the Get Started flow.  This should only be shown
-  // when an Account actually exists.
-  Accounts.launchSetup();
-}
-
-function getURLForAction(action, urlParams) {
-  let url = Services.urlFormatter.formatURLPref(
-    "identity.fxaccounts.remote.webchannel.uri"
-  );
-  url = url + (url.endsWith("/") ? "" : "/") + action;
-  const CONTEXT = "fx_fennec_v1";
-  // The only service managed by Fennec, to date, is Firefox Sync.
-  const SERVICE = "sync";
-  urlParams = urlParams || new URLSearchParams("");
-  urlParams.set("service", SERVICE);
-  urlParams.set("context", CONTEXT);
-  // Ideally we'd just merge urlParams with new URL(url).searchParams, but our
-  // URLSearchParams implementation doesn't support iteration (bug 1085284).
-  let urlParamStr = urlParams.toString();
-  if (urlParamStr) {
-    url += (url.includes("?") ? "&" : "?") + urlParamStr;
-  }
-  return url;
-}
-
-function updateDisplayedEmail(user) {
-  let emailDiv = document.getElementById("email");
-  if (emailDiv && user) {
-    emailDiv.textContent = user.email;
-  }
-}
-
-function init() {
-  // Test for restrictions before getFirefoxAccount(), since that will fail if
-  // we are restricted.
-  if (!ParentalControls.isAllowed(ParentalControls.MODIFY_ACCOUNTS)) {
-    // It's better to log and show an error message than to invite user
-    // confusion by removing about:accounts entirely.  That is, if the user is
-    // restricted, this way they'll discover as much and may be able to get
-    // out of their restricted profile.  If we remove about:accounts entirely,
-    // it will look like Fennec is buggy, and the user will be very confused.
-    log.e(
-      "This profile cannot connect to Firefox Accounts: showing restricted error."
-    );
-    show("restrictedError");
-    return;
-  }
-
-  Accounts.getFirefoxAccount()
-    .then(user => {
-      // It's possible for the window to start closing before getting the user
-      // completes.  Tests in particular can cause this.
-      if (window.closed) {
-        return;
-      }
-
-      updateDisplayedEmail(user);
-
-      // Ideally we'd use new URL(document.URL).searchParams, but for about: URIs,
-      // searchParams is empty.
-      let urlParams = new URLSearchParams(document.URL.split("?")[1] || "");
-      let action = urlParams.get(ACTION_URL_PARAM);
-      urlParams.delete(ACTION_URL_PARAM);
-
-      switch (action) {
-        case "signup":
-          if (user) {
-            // Asking to sign-up when already signed in just shows prefs.
-            show("prefs");
-          } else {
-            show("spinner");
-            wrapper.init(getURLForAction("signup", urlParams));
-          }
-          break;
-        case "signin":
-          if (user) {
-            // Asking to sign-in when already signed in just shows prefs.
-            show("prefs");
-          } else {
-            show("spinner");
-            wrapper.init(getURLForAction("signin", urlParams));
-          }
-          break;
-        case "force_auth":
-          if (user) {
-            show("spinner");
-            urlParams.set("email", user.email); // In future, pin using the UID.
-            wrapper.init(getURLForAction("force_auth", urlParams));
-          } else {
-            show("spinner");
-            wrapper.init(getURLForAction("signup", urlParams));
-          }
-          break;
-        case "manage":
-          if (user) {
-            show("spinner");
-            urlParams.set("email", user.email); // In future, pin using the UID.
-            wrapper.init(getURLForAction("settings", urlParams));
-          } else {
-            show("spinner");
-            wrapper.init(getURLForAction("signup", urlParams));
-          }
-          break;
-        case "avatar":
-          if (user) {
-            show("spinner");
-            urlParams.set("email", user.email); // In future, pin using the UID.
-            wrapper.init(getURLForAction("settings/avatar/change", urlParams));
-          } else {
-            show("spinner");
-            wrapper.init(getURLForAction("signup", urlParams));
-          }
-          break;
-        default:
-          // Unrecognized or no action specified.
-          if (action) {
-            log.w("Ignoring unrecognized action: " + action);
-          }
-          if (user) {
-            show("prefs");
-          } else {
-            show("spinner");
-            wrapper.init(getURLForAction("signup", urlParams));
-          }
-          break;
-      }
-    })
-    .catch(e => {
-      log.e("Failed to get the signed in user: " + e.toString());
-    });
-}
-
-document.addEventListener(
-  "DOMContentLoaded",
-  function() {
-    init();
-    var buttonRetry = document.getElementById("buttonRetry");
-    buttonRetry.addEventListener("click", retry);
-
-    var buttonOpenPrefs = document.getElementById("buttonOpenPrefs");
-    buttonOpenPrefs.addEventListener("click", openPrefs);
-  },
-  { capture: true, once: true }
-);
-
-// This window is contained in a XUL <browser> element.  Return the
-// messageManager of that <browser> element, or null.
-function getBrowserMessageManager() {
-  let browser = window.docShell.rootTreeItem.domWindow.BrowserApp.getBrowserForDocument(
-    document
-  );
-  if (browser) {
-    return browser.messageManager;
-  }
-  return null;
-}
-
-// Add a single listener for 'loaded' messages from the iframe in this
-// <browser>.  These 'loaded' messages are ferried from the WebChannel to just
-// this <browser>.
-var mm = getBrowserMessageManager();
-if (mm) {
-  mm.addMessageListener(COMMAND_LOADED, handleLoadedMessage);
-} else {
-  log.e("No messageManager, not listening for LOADED message!");
-}
-
-window.addEventListener("unload", function(event) {
-  try {
-    let mm = getBrowserMessageManager();
-    if (mm) {
-      mm.removeMessageListener(COMMAND_LOADED, handleLoadedMessage);
-    }
-  } catch (e) {
-    // This could fail if the page is being torn down, the tab is being
-    // destroyed, etc.
-    log.w("Not removing listener for LOADED message: " + e.toString());
-  }
-});
diff --git a/mobile/android/chrome/content/aboutAccounts.xhtml b/mobile/android/chrome/content/aboutAccounts.xhtml
deleted file mode 100644
index 3ee059eb31e1..000000000000
--- a/mobile/android/chrome/content/aboutAccounts.xhtml
+++ /dev/null
@@ -1,83 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
-  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd" [
-<!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd" >
-%brandDTD;
-<!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd" >
-%globalDTD;
-<!ENTITY % aboutDTD SYSTEM "chrome://browser/locale/aboutAccounts.dtd">
-%aboutDTD;
-]>
-
-<html xmlns="http://www.w3.org/1999/xhtml" dir="&locale.dir;">
-  <head>
-    <title>Firefox Sync</title>
-    <meta name="viewport" content="width=device-width; user-scalable=0" />
-    <link rel="icon" type="image/png" sizes="64x64" href="chrome://branding/content/favicon64.png" />
-    <link rel="stylesheet" href="chrome://browser/skin/spinner.css" type="text/css"/>
-    <link rel="stylesheet" href="chrome://browser/skin/aboutBase.css" type="text/css"/>
-    <link rel="stylesheet" href="chrome://browser/skin/aboutAccounts.css" type="text/css"/>
-  </head>
-  <body>
-    <div id="spinner" class="toplevel">
-      <div class="container flex-column">
-        <!-- Empty text-container for spacing. -->
-        <div class="text-container flex-column" />
-
-          <div class="mui-refresh-main">
-            <div class="mui-refresh-wrapper">
-              <div class="mui-spinner-wrapper">
-                <div class="mui-spinner-main">
-                  <div class="mui-spinner-left">
-                    <div class="mui-half-circle-left" />
-                  </div>
-                  <div class="mui-spinner-right">
-                    <div class="mui-half-circle-right" />
-                  </div>
-                </div>
-              </div>
-            </div>
-          </div>
-
-      </div>
-    </div>
-
-    <iframe mozframetype="content" id="remote" class="toplevel" />
-
-    <div id="prefs" class="toplevel">
-      <div class="container flex-column">
-        <div class="text-container flex-column">
-          <div class="text">&aboutAccounts.connected.title;</div>
-          <div class="hint">&aboutAccounts.connected.description;</div>
-          <div id="email" class="hint"></div>
-        </div>
-        <a id="buttonOpenPrefs" tabindex="0" href="#">&aboutAccounts.syncPreferences.label;</a>
-      </div>
-    </div>
-
-    <div id="networkError" class="toplevel">
-      <div class="container flex-column">
-        <div class="text-container flex-column">
-          <div class="text">&aboutAccounts.noConnection.title;</div>
-        </div>
-        <div class="button-row">
-          <button id="buttonRetry" class="button" tabindex="1">&aboutAccounts.retry.label;</button>
-        </div>
-      </div>
-    </div>
-
-    <div id="restrictedError" class="toplevel">
-      <div class="container flex-column">
-        <div class="text-container flex-column">
-          <div class="text">&aboutAccounts.restrictedError.title;</div>
-          <div class="hint">&aboutAccounts.restrictedError.description;</div>
-        </div>
-      </div>
-    </div>
-
-    <script type="application/javascript" src="chrome://browser/content/aboutAccounts.js"></script>
-  </body>
-</html>
diff --git a/mobile/android/chrome/content/aboutAddons.js b/mobile/android/chrome/content/aboutAddons.js
deleted file mode 100644
index 02081153173b..000000000000
--- a/mobile/android/chrome/content/aboutAddons.js
+++ /dev/null
@@ -1,897 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* globals gChromeWin */
-
-const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
-const { AddonManager } = ChromeUtils.import(
-  "resource://gre/modules/AddonManager.jsm"
-);
-const { XPCOMUtils } = ChromeUtils.import(
-  "resource://gre/modules/XPCOMUtils.jsm"
-);
-const { EventDispatcher } = ChromeUtils.import(
-  "resource://gre/modules/Messaging.jsm"
-);
-
-const AMO_ICON = "chrome://browser/skin/images/amo-logo.png";
-const UPDATE_INDICATOR = "chrome://browser/skin/images/extension-update.svg";
-
-var gStringBundle = Services.strings.createBundle(
-  "chrome://browser/locale/aboutAddons.properties"
-);
-
-XPCOMUtils.defineLazyGetter(window, "gChromeWin", function() {
-  return window.docShell.rootTreeItem.domWindow;
-});
-ChromeUtils.defineModuleGetter(
-  window,
-  "Preferences",
-  "resource://gre/modules/Preferences.jsm"
-);
-
-var ContextMenus = {
-  target: null,
-
-  init: function() {
-    document.addEventListener("contextmenu", this);
-
-    document
-      .getElementById("contextmenu-enable")
-      .addEventListener("click", ContextMenus.enable.bind(this));
-    document
-      .getElementById("contextmenu-disable")
-      .addEventListener("click", ContextMenus.disable.bind(this));
-    document
-      .getElementById("contextmenu-uninstall")
-      .addEventListener("click", ContextMenus.uninstall.bind(this));
-
-    // XXX - Hack to fix bug 985867 for now
-    document.addEventListener("touchstart", function() {});
-  },
-
-  handleEvent: function(event) {
-    // store the target of context menu events so that we know which app to act on
-    this.target = event.target;
-    while (!this.target.hasAttribute("contextmenu")) {
-      this.target = this.target.parentNode;
-    }
-
-    if (!this.target) {
-      document
-        .getElementById("contextmenu-enable")
-        .setAttribute("hidden", "true");
-      document
-        .getElementById("contextmenu-disable")
-        .setAttribute("hidden", "true");
-      document
-        .getElementById("contextmenu-uninstall")
-        .setAttribute("hidden", "true");
-      return;
-    }
-
-    let addon = this.target.addon;
-    if (addon.scope == AddonManager.SCOPE_APPLICATION) {
-      document
-        .getElementById("contextmenu-uninstall")
-        .setAttribute("hidden", "true");
-    } else {
-      document
-        .getElementById("contextmenu-uninstall")
-        .removeAttribute("hidden");
-    }
-
-    // Hide the enable/disable context menu items if the add-on was disabled by
-    // Firefox (e.g. unsigned or blocklisted add-on).
-    if (addon.appDisabled) {
-      document
-        .getElementById("contextmenu-enable")
-        .setAttribute("hidden", "true");
-      document
-        .getElementById("contextmenu-disable")
-        .setAttribute("hidden", "true");
-      return;
-    }
-
-    let enabled = this.target.getAttribute("isDisabled") != "true";
-    if (enabled) {
-      document
-        .getElementById("contextmenu-enable")
-        .setAttribute("hidden", "true");
-      document.getElementById("contextmenu-disable").removeAttribute("hidden");
-    } else {
-      document.getElementById("contextmenu-enable").removeAttribute("hidden");
-      document
-        .getElementById("contextmenu-disable")
-        .setAttribute("hidden", "true");
-    }
-  },
-
-  enable: function(event) {
-    Addons.setEnabled(true, this.target.addon);
-    this.target = null;
-  },
-
-  disable: function(event) {
-    Addons.setEnabled(false, this.target.addon);
-    this.target = null;
-  },
-
-  uninstall: function(event) {
-    Addons.uninstall(this.target.addon);
-    this.target = null;
-  },
-};
-
-function sendEMPong() {
-  Services.obs.notifyObservers(window, "EM-pong");
-}
-
-async function init() {
-  window.addEventListener("popstate", onPopState);
-
-  AddonManager.addInstallListener(Addons);
-  AddonManager.addAddonListener(Addons);
-
-  await Addons.init();
-  showAddons();
-  ContextMenus.init();
-
-  Services.obs.addObserver(sendEMPong, "EM-ping");
-
-  // The addons list has been loaded and rendered, send a notification
-  // if the openOptionsPage is waiting to be able to select an addon details page.
-  Services.obs.notifyObservers(window, "EM-loaded");
-}
-
-function uninit() {
-  AddonManager.removeInstallListener(Addons);
-  AddonManager.removeAddonListener(Addons);
-
-  Services.obs.removeObserver(sendEMPong, "EM-ping");
-}
-
-function openLink(url) {
-  let BrowserApp = gChromeWin.BrowserApp;
-  BrowserApp.addTab(url, {
-    selected: true,
-    parentId: BrowserApp.selectedTab.id,
-  });
-}
-
-function openOptionsInTab(url) {
-  let BrowserApp = gChromeWin.BrowserApp;
-  BrowserApp.selectOrAddTab(url, {
-    startsWith: true,
-    selected: true,
-    parentId: BrowserApp.selectedTab.id,
-  });
-}
-
-function onPopState(aEvent) {
-  // Called when back/forward is used to change the state of the page
-  if (aEvent.state) {
-    // Show the detail page for an addon
-    const listItem = Addons._getElementForAddon(aEvent.state.id);
-    if (listItem) {
-      Addons.showDetails(listItem);
-    } else {
-      // If the addon doesn't exist anymore, go back in the history.
-      history.back();
-    }
-  } else {
-    // Clear any previous detail addon
-    let detailItem = document.querySelector("#addons-details > .addon-item");
-    detailItem.addon = null;
-
-    showAddons();
-  }
-}
-
-function showAddonDetails(addonId) {
-  const listItem = Addons._getElementForAddon(addonId);
-  if (listItem) {
-    Addons.showDetails(listItem);
-    history.pushState({ id: addonId }, document.title);
-  } else {
-    throw new Error(`Addon not found: ${addonId}`);
-  }
-}
-
-function showAddons() {
-  // Hide the addon options and show the addons list
-  let details = document.querySelector("#addons-details");
-  details.classList.add("hidden");
-  let list = document.querySelector("#addons-list");
-  list.classList.remove("hidden");
-  document.documentElement.removeAttribute("details");
-
-  // Clean the optionsBox content when switching to the add-ons list view.
-  let optionsBox = document.querySelector(
-    "#addons-details > .addon-item .options-box"
-  );
-  optionsBox.innerHTML = "";
-}
-
-function showAddonOptions() {
-  // Hide the addon list and show the addon options
-  let list = document.querySelector("#addons-list");
-  list.classList.add("hidden");
-  let details = document.querySelector("#addons-details");
-  details.classList.remove("hidden");
-  document.documentElement.setAttribute("details", "true");
-}
-
-var Addons = {
-  _restartCount: 0,
-
-  _createItem: function _createItem(aAddon) {
-    let outer = document.createElement("div");
-    outer.setAttribute("addonID", aAddon.id);
-    outer.className = "addon-item list-item";
-    outer.setAttribute("role", "button");
-    outer.setAttribute("contextmenu", "addonmenu");
-    outer.addEventListener(
-      "click",
-      () => {
-        this.showDetails(outer);
-        history.pushState({ id: aAddon.id }, document.title);
-      },
-      true
-    );
-
-    let img = document.createElement("img");
-    img.className = "icon";
-    img.setAttribute("src", aAddon.iconURL || AMO_ICON);
-    outer.appendChild(img);
-
-    let inner = document.createElement("div");
-    inner.className = "inner";
-
-    let details = document.createElement("div");
-    details.className = "details";
-    inner.appendChild(details);
-
-    let titlePart = document.createElement("div");
-    titlePart.textContent = aAddon.name;
-    titlePart.className = "title";
-    details.appendChild(titlePart);
-
-    let versionPart = document.createElement("div");
-    versionPart.textContent = aAddon.version;
-    versionPart.className = "version";
-    details.appendChild(versionPart);
-
-    if ("description" in aAddon) {
-      let descPart = document.createElement("div");
-      descPart.textContent = aAddon.description;
-      descPart.className = "description";
-      inner.appendChild(descPart);
-    }
-
-    outer.appendChild(inner);
-
-    let update = document.createElement("img");
-    update.className = "update-indicator";
-    update.setAttribute("src", UPDATE_INDICATOR);
-    outer.appendChild(update);
-
-    return outer;
-  },
-
-  _createBrowseItem: function _createBrowseItem() {
-    let outer = document.createElement("div");
-    outer.className = "addon-item list-item";
-    outer.setAttribute("role", "button");
-    outer.addEventListener(
-      "click",
-      function(event) {
-        try {
-          openLink(
-            Services.urlFormatter.formatURLPref(
-              "extensions.getAddons.browseAddons"
-            )
-          );
-        } catch (e) {
-          Cu.reportError(e);
-        }
-      },
-      true
-    );
-
-    let img = document.createElement("img");
-    img.className = "icon";
-    img.setAttribute("src", AMO_ICON);
-    outer.appendChild(img);
-
-    let inner = document.createElement("div");
-    inner.className = "inner";
-
-    let title = document.createElement("div");
-    title.id = "browse-title";
-    title.className = "title";
-    title.textContent = this._getAmoTitle();
-    inner.appendChild(title);
-
-    outer.appendChild(inner);
-    return outer;
-  },
-
-  // Ensure we get a localized string by using the previous title as a fallback
-  // if the new one has not yet been translated.
-  _getAmoTitle: function _getAmoTitle() {
-    const initialTitleUS = "Browse all Firefox Add-ons";
-    const updatedTitleUS = "Browse Firefox’s Recommended Extensions";
-    const initialTitleLocalized = gStringBundle.GetStringFromName(
-      "addons.browseAll"
-    );
-    const updatedTitleLocalized = gStringBundle.GetStringFromName(
-      "addons.browseRecommended"
-    );
-    let title = initialTitleLocalized;
-
-    const titleWasLocalized = updatedTitleLocalized !== updatedTitleUS;
-    const localeIsDefaultUS =
-      updatedTitleLocalized === updatedTitleUS &&
-      initialTitleLocalized === initialTitleUS;
-
-    if (titleWasLocalized || localeIsDefaultUS) {
-      title = updatedTitleLocalized;
-    }
-
-    EventDispatcher.instance.dispatch("about:addons", { amoTitle: title });
-    return title;
-  },
-
-  _createItemForAddon: function _createItemForAddon(aAddon) {
-    let opType = this._getOpTypeForOperations(aAddon.pendingOperations);
-    let hasUpdate = this._addonHasUpdate(aAddon);
-
-    let optionsURL = aAddon.optionsURL || "";
-
-    let blocked = "";
-    switch (aAddon.blocklistState) {
-      case Ci.nsIBlocklistService.STATE_BLOCKED:
-        blocked = "blocked";
-        break;
-      case Ci.nsIBlocklistService.STATE_SOFTBLOCKED:
-        blocked = "softBlocked";
-        break;
-      case Ci.nsIBlocklistService.STATE_OUTDATED:
-        blocked = "outdated";
-        break;
-    }
-
-    let item = this._createItem(aAddon);
-    item.setAttribute("isDisabled", !aAddon.isActive);
-    item.setAttribute(
-      "isUnsigned",
-      aAddon.signedState <= AddonManager.SIGNEDSTATE_MISSING
-    );
-    item.setAttribute("opType", opType);
-    if (blocked) {
-      item.setAttribute("blockedStatus", blocked);
-    }
-    item.setAttribute("optionsURL", optionsURL);
-    item.setAttribute("hasUpdate", hasUpdate);
-    item.addon = aAddon;
-
-    return item;
-  },
-
-  _getElementForAddon: function(aKey) {
-    let list = document.getElementById("addons-list");
-    let element = list.querySelector('div[addonID="' + CSS.escape(aKey) + '"]');
-    return element;
-  },
-
-  _addonHasUpdate(addon) {
-    return gChromeWin.ExtensionPermissions.updates.has(addon.id);
-  },
-
-  init: async function init() {
-    const aAddons = await AddonManager.getAllAddons();
-
-    // Clear all content before filling the addons
-    let list = document.getElementById("addons-list");
-    list.innerHTML = "";
-
-    aAddons.sort(function(a, b) {
-      return a.name.localeCompare(b.name);
-    });
-
-    for (let i = 0; i < aAddons.length; i++) {
-      // Don't create item for system add-ons.
-      if (aAddons[i].isSystem) {
-        continue;
-      }
-
-      let item = this._createItemForAddon(aAddons[i]);
-      list.appendChild(item);
-    }
-
-    // Add a "Browse all Firefox Add-ons" item to the bottom of the list.
-    let browseItem = this._createBrowseItem();
-    list.appendChild(browseItem);
-
-    document
-      .getElementById("update-btn")
-      .addEventListener("click", Addons.updateCurrent.bind(this));
-    document
-      .getElementById("uninstall-btn")
-      .addEventListener("click", Addons.uninstallCurrent.bind(this));
-    document
-      .getElementById("cancel-btn")
-      .addEventListener("click", Addons.cancelUninstall.bind(this));
-    document
-      .getElementById("disable-btn")
-      .addEventListener("click", Addons.disable.bind(this));
-    document
-      .getElementById("enable-btn")
-      .addEventListener("click", Addons.enable.bind(this));
-
-    document
-      .getElementById("unsigned-learn-more")
-      .addEventListener("click", function() {
-        openLink(
-          Services.urlFormatter.formatURLPref("app.support.baseURL") +
-            "unsigned-addons"
-        );
-      });
-  },
-
-  _getOpTypeForOperations: function _getOpTypeForOperations(aOperations) {
-    if (aOperations & AddonManager.PENDING_UNINSTALL) {
-      return "needs-uninstall";
-    }
-    if (aOperations & AddonManager.PENDING_ENABLE) {
-      return "needs-enable";
-    }
-    if (aOperations & AddonManager.PENDING_DISABLE) {
-      return "needs-disable";
-    }
-    return "";
-  },
-
-  showDetails: function showDetails(aListItem) {
-    let detailItem = document.querySelector("#addons-details > .addon-item");
-    detailItem.setAttribute("isDisabled", aListItem.getAttribute("isDisabled"));
-    detailItem.setAttribute("isUnsigned", aListItem.getAttribute("isUnsigned"));
-    detailItem.setAttribute("opType", aListItem.getAttribute("opType"));
-    detailItem.setAttribute("optionsURL", aListItem.getAttribute("optionsURL"));
-    let addon = (detailItem.addon = aListItem.addon);
-
-    let favicon = document.querySelector("#addons-details > .addon-item .icon");
-    favicon.setAttribute("src", addon.iconURL || AMO_ICON);
-
-    detailItem.querySelector(".title").textContent = addon.name;
-    detailItem.querySelector(".version").textContent = addon.version;
-    detailItem.querySelector(".description-full").textContent =
-      addon.description;
-    detailItem.querySelector(
-      ".status-uninstalled"
-    ).textContent = gStringBundle.formatStringFromName(
-      "addonStatus.uninstalled",
-      [addon.name]
-    );
-
-    let updateBtn = document.getElementById("update-btn");
-    if (this._addonHasUpdate(addon)) {
-      updateBtn.removeAttribute("hidden");
-    } else {
-      updateBtn.setAttribute("hidden", true);
-    }
-
-    let enableBtn = document.getElementById("enable-btn");
-    if (addon.appDisabled) {
-      enableBtn.setAttribute("disabled", "true");
-    } else {
-      enableBtn.removeAttribute("disabled");
-    }
-
-    let uninstallBtn = document.getElementById("uninstall-btn");
-    if (addon.scope == AddonManager.SCOPE_APPLICATION) {
-      uninstallBtn.setAttribute("disabled", "true");
-    } else {
-      uninstallBtn.removeAttribute("disabled");
-    }
-
-    let addonItem = document.querySelector("#addons-details > .addon-item");
-    let optionsBox = addonItem.querySelector(".options-box");
-    let optionsURL = aListItem.getAttribute("optionsURL");
-
-    // Always clean the options content before rendering the options of the
-    // newly selected extension.
-    optionsBox.innerHTML = "";
-
-    switch (parseInt(addon.optionsType)) {
-      case AddonManager.OPTIONS_TYPE_INLINE_BROWSER:
-        // Allow the options to use all the available width space.
-        optionsBox.classList.remove("inner");
-
-        this.createWebExtensionOptions(optionsBox, addon, addonItem);
-        break;
-      case AddonManager.OPTIONS_TYPE_TAB:
-        // Keep the usual layout for any options related the legacy (or system) add-ons
-        // when the options are opened in a new tab from a single button in the addon
-        // details page.
-        optionsBox.classList.add("inner");
-
-        this.createOptionsInTabButton(optionsBox, addon, addonItem);
-        break;
-    }
-
-    showAddonOptions();
-  },
-
-  createOptionsInTabButton: function(destination, addon, detailItem) {
-    let frame = destination.querySelector("iframe#addon-options");
-    let button = destination.querySelector("button#open-addon-options");
-
-    if (frame) {
-      // Remove any existent options frame (e.g. when the addon updates
-      // contains the open_in_tab options for the first time).
-
-      frame.remove();
-    }
-
-    if (!button) {
-      button = document.createElement("button");
-      button.setAttribute("id", "open-addon-options");
-      button.textContent = gStringBundle.GetStringFromName("addon.options");
-      destination.appendChild(button);
-    }
-
-    button.onclick = async () => {
-      if (addon.isWebExtension) {
-        // WebExtensions are loaded asynchronously and the optionsURL
-        // may not be available until the addon has been started.
-        await addon.startupPromise;
-      }
-
-      const { optionsURL } = addon;
-      openOptionsInTab(optionsURL);
-    };
-
-    // Ensure that the Addon Options are visible (the options box will be hidden if the optionsURL
-    // attribute is an empty string, which happens when a WebExtensions is still loading).
-    detailItem.removeAttribute("optionsURL");
-  },
-
-  createWebExtensionOptions: async function(destination, addon, detailItem) {
-    // WebExtensions are loaded asynchronously and the optionsURL
-    // may not be available until the addon has been started.
-    await addon.startupPromise;
-
-    const { optionsURL, optionsBrowserStyle } = addon;
-    let frame = destination.querySelector("iframe#addon-options");
-
-    if (!frame) {
-      let originalHeight;
-      frame = document.createElement("iframe");
-      frame.setAttribute("id", "addon-options");
-      frame.setAttribute("mozbrowser", "true");
-      frame.setAttribute("style", "width: 100%; overflow: hidden;");
-
-      // Adjust iframe height to the iframe content (also between navigation of multiple options
-      // files).
-      frame.onload = evt => {
-        if (evt.target !== frame) {
-          return;
-        }
-
-        const { document } = frame.contentWindow;
-        const bodyScrollHeight = document.body && document.body.scrollHeight;
-        const documentScrollHeight = document.documentElement.scrollHeight;
-
-        // Set the iframe height to the maximum between the body and the document
-        // scrollHeight values.
-        frame.style.height =
-          Math.max(bodyScrollHeight, documentScrollHeight) + "px";
-
-        // Restore the original iframe height between option page loads,
-        // so that we don't force the new document to have the same size
-        // of the previosuly loaded option page.
-        frame.contentWindow.addEventListener(
-          "unload",
-          () => {
-            frame.style.height = originalHeight + "px";
-          },
-          { once: true }
-        );
-      };
-
-      destination.appendChild(frame);
-      originalHeight = frame.getBoundingClientRect().height;
-    }
-
-    // Loading the URL this way prevents the native back
-    // button from applying to the iframe.
-    frame.contentWindow.location.replace(optionsURL);
-
-    // Ensure that the Addon Options are visible (the options box will be hidden if the optionsURL
-    // attribute is an empty string, which happens when a WebExtensions is still loading).
-    detailItem.removeAttribute("optionsURL");
-  },
-
-  setEnabled: function setEnabled(aValue, aAddon) {
-    let detailItem = document.querySelector("#addons-details > .addon-item");
-    let addon = aAddon || detailItem.addon;
-    if (!addon) {
-      return;
-    }
-
-    let listItem = this._getElementForAddon(addon.id);
-
-    function setDisabled(addon, value) {
-      if (value) {
-        return addon.disable();
-      }
-      return addon.enable();
-    }
-
-    function updateOtherThemeStateInUI(item) {
-      if (aValue) {
-        // Mark the previously enabled theme as disabled.
-        if (item.addon.isActive) {
-          item.setAttribute("isDisabled", true);
-          return true;
-        }
-        // The current theme is being disabled - enable the default theme.
-      } else if (item.addon.id == "default-theme@mozilla.org") {
-        item.removeAttribute("isDisabled");
-        return true;
-      }
-      return false;
-    }
-
-    let opType;
-    if (addon.type == "theme") {
-      // Themes take care of themselves to make sure only one is active at the
-      // same time, but we need to fix up the state of other themes in the UI.
-      let list = document.getElementById("addons-list");
-      let item = list.firstElementChild;
-      while (item) {
-        if (
-          item.addon &&
-          item.addon.type == "theme" &&
-          updateOtherThemeStateInUI(item)
-        ) {
-          break;
-        }
-        item = item.nextSibling;
-      }
-      setDisabled(addon, !aValue);
-    } else if (addon.type == "locale") {
-      setDisabled(addon, !aValue);
-    } else {
-      setDisabled(addon, !aValue);
-      opType = this._getOpTypeForOperations(addon.pendingOperations);
-
-      if (
-        addon.pendingOperations & AddonManager.PENDING_ENABLE ||
-        addon.pendingOperations & AddonManager.PENDING_DISABLE
-      ) {
-        this.showRestart();
-      } else if (
-        listItem &&
-        /needs-(enable|disable)/.test(listItem.getAttribute("opType"))
-      ) {
-        this.hideRestart();
-      }
-    }
-
-    if (addon == detailItem.addon) {
-      detailItem.setAttribute("isDisabled", !aValue);
-      if (opType) {
-        detailItem.setAttribute("opType", opType);
-      } else {
-        detailItem.removeAttribute("opType");
-      }
-
-      // Remove any addon options iframe if the currently selected addon has been disabled.
-      if (!aValue) {
-        const addonOptionsIframe = document.querySelector("#addon-options");
-        if (addonOptionsIframe) {
-          addonOptionsIframe.remove();
-        }
-      }
-    }
-
-    // Sync to the list item
-    if (listItem) {
-      listItem.setAttribute("isDisabled", !aValue);
-      if (opType) {
-        listItem.setAttribute("opType", opType);
-      } else {
-        listItem.removeAttribute("opType");
-      }
-    }
-  },
-
-  enable: function enable() {
-    this.setEnabled(true);
-  },
-
-  disable: function disable() {
-    this.setEnabled(false);
-  },
-
-  updateCurrent() {
-    let detailItem = document.querySelector("#addons-details > .addon-item");
-
-    let addon = detailItem.addon;
-    if (!addon) {
-      return;
-    }
-
-    gChromeWin.ExtensionPermissions.applyUpdate(addon.id);
-  },
-
-  uninstallCurrent: function uninstallCurrent() {
-    let detailItem = document.querySelector("#addons-details > .addon-item");
-
-    let addon = detailItem.addon;
-    if (!addon) {
-      return;
-    }
-
-    this.uninstall(addon);
-  },
-
-  uninstall: function uninstall(aAddon) {
-    if (!aAddon) {
-      return;
-    }
-
-    let listItem = this._getElementForAddon(aAddon.id);
-    aAddon.uninstall();
-
-    if (aAddon.pendingOperations & AddonManager.PENDING_UNINSTALL) {
-      this.showRestart();
-
-      // A disabled addon doesn't need a restart so it has no pending ops and
-      // can't be cancelled
-      let opType = this._getOpTypeForOperations(aAddon.pendingOperations);
-      if (!aAddon.isActive && opType == "") {
-        opType = "needs-uninstall";
-      }
-
-      detailItem.setAttribute("opType", opType);
-      listItem.setAttribute("opType", opType);
-    }
-  },
-
-  cancelUninstall: function ev_cancelUninstall() {
-    let detailItem = document.querySelector("#addons-details > .addon-item");
-    let addon = detailItem.addon;
-    if (!addon) {
-      return;
-    }
-
-    addon.cancelUninstall();
-    this.hideRestart();
-
-    let opType = this._getOpTypeForOperations(addon.pendingOperations);
-    detailItem.setAttribute("opType", opType);
-
-    let listItem = this._getElementForAddon(addon.id);
-    listItem.setAttribute("opType", opType);
-  },
-
-  showRestart: function showRestart() {
-    this._restartCount++;
-    gChromeWin.XPInstallObserver.showRestartPrompt();
-  },
-
-  hideRestart: function hideRestart() {
-    this._restartCount--;
-    if (this._restartCount == 0) {
-      gChromeWin.XPInstallObserver.hideRestartPrompt();
-    }
-  },
-
-  onEnabled: function(aAddon) {
-    let listItem = this._getElementForAddon(aAddon.id);
-    if (!listItem) {
-      return;
-    }
-
-    // Reload the details to pick up any options now that it's enabled.
-    listItem.setAttribute("optionsURL", aAddon.optionsURL || "");
-    let detailItem = document.querySelector("#addons-details > .addon-item");
-    if (aAddon == detailItem.addon) {
-      this.showDetails(listItem);
-    }
-  },
-
-  onInstallEnded: function(aInstall, aAddon) {
-    let needsRestart = false;
-    if (
-      aInstall.existingAddon &&
-      aInstall.existingAddon.pendingOperations & AddonManager.PENDING_UPGRADE
-    ) {
-      needsRestart = true;
-    } else if (aAddon.pendingOperations & AddonManager.PENDING_INSTALL) {
-      needsRestart = true;
-    }
-
-    let list = document.getElementById("addons-list");
-    let element = this._getElementForAddon(aAddon.id);
-    if (!element) {
-      element = this._createItemForAddon(aAddon);
-      list.insertBefore(element, list.firstElementChild);
-    }
-
-    if (needsRestart) {
-      element.setAttribute("opType", "needs-restart");
-    }
-  },
-
-  onInstalled: function(aAddon) {
-    let list = document.getElementById("addons-list");
-    let element = this._getElementForAddon(aAddon.id);
-    if (element) {
-      // Upgrade of an existing addon, update version and description in
-      // list item and detail view, plus indicators about a pending update.
-      element.querySelector(".version").textContent = aAddon.version;
-
-      let desc = element.querySelector(".description");
-      if (desc) {
-        desc.textContent = aAddon.description;
-      }
-
-      element.setAttribute("hasUpdate", false);
-      document.getElementById("update-btn").setAttribute("hidden", true);
-
-      element = document.querySelector("#addons-details > .addon-item");
-      if (element.addon && element.addon.id == aAddon.id) {
-        element.querySelector(".version").textContent = aAddon.version;
-        element.querySelector(".description-full").textContent =
-          aAddon.description;
-      }
-    } else {
-      element = this._createItemForAddon(aAddon);
-
-      // Themes aren't considered active on install, so set existing as disabled, and new one enabled.
-      if (aAddon.type == "theme") {
-        let item = list.firstElementChild;
-        while (item) {
-          if (item.addon && item.addon.type == "theme") {
-            item.setAttribute("isDisabled", true);
-          }
-          item = item.nextSibling;
-        }
-        element.setAttribute("isDisabled", false);
-      }
-
-      list.insertBefore(element, list.firstElementChild);
-    }
-  },
-
-  onUninstalled: function(aAddon) {
-    let list = document.getElementById("addons-list");
-    let element = this._getElementForAddon(aAddon.id);
-    list.removeChild(element);
-
-    // Go back if we're in the detail view of the add-on that was uninstalled.
-    let detailItem = document.querySelector("#addons-details > .addon-item");
-    if (detailItem.addon.id == aAddon.id) {
-      history.back();
-    }
-  },
-
-  onInstallFailed: function(aInstall) {},
-
-  onDownloadProgress: function xpidm_onDownloadProgress(aInstall) {},
-
-  onDownloadFailed: function(aInstall) {},
-
-  onDownloadCancelled: function(aInstall) {},
-};
-
-window.addEventListener("load", init);
-window.addEventListener("unload", uninit);
diff --git a/mobile/android/chrome/content/aboutAddons.xhtml b/mobile/android/chrome/content/aboutAddons.xhtml
deleted file mode 100644
index 4090066f9121..000000000000
--- a/mobile/android/chrome/content/aboutAddons.xhtml
+++ /dev/null
@@ -1,63 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
-  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd" [
-<!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd" >
-%brandDTD;
-<!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd" >
-%globalDTD;
-<!ENTITY % aboutDTD SYSTEM "chrome://browser/locale/aboutAddons.dtd" >
-%aboutDTD;
-]>
-
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-
-<html xmlns="http://www.w3.org/1999/xhtml">
-<head>
-  <title>&aboutAddons.title2;</title>
-  <meta name="viewport" content="width=device-width; user-scalable=0" />
-  <link rel="icon" type="image/png" sizes="64x64" href="chrome://branding/content/favicon64.png" />
-  <link rel="stylesheet" href="chrome://browser/skin/aboutBase.css" type="text/css"/>
-  <link rel="stylesheet" href="chrome://browser/skin/aboutAddons.css" type="text/css"/>
-</head>
-
-<body dir="&locale.dir;">
-  <menu type="context" id="addonmenu">
-    <menuitem id="contextmenu-enable" label="&addonAction.enable;"></menuitem>
-    <menuitem id="contextmenu-disable" label="&addonAction.disable;" ></menuitem>
-    <menuitem id="contextmenu-uninstall" label="&addonAction.uninstall;" ></menuitem>
-  </menu>
-
-  <div id="addons-header" class="header">
-    <div>&aboutAddons.header2;</div>
-  </div>
-  <div id="addons-list" class="list hidden">
-  </div>
-
-  <div id="addons-details" class="list hidden">
-    <div class="addon-item list-item">
-      <img class="icon"/>
-      <div class="inner">
-        <div class="details">
-          <div class="title"></div><div class="version"></div>
-        </div>
-        <div class="description-full"></div>
-      </div>
-      <div class="warn-unsigned">&addonUnsigned.message; <a id="unsigned-learn-more">&addonUnsigned.learnMore;</a></div>
-      <div class="options-box"></div>
-      <div class="status status-uninstalled show-on-uninstall"></div>
-      <div class="buttons">
-        <button id="update-btn" class="show-on-update">&addonAction.update;</button>
-        <button id="enable-btn" class="show-on-disable hide-on-enable hide-on-uninstall" >&addonAction.enable;</button>
-        <button id="disable-btn" class="show-on-enable hide-on-disable hide-on-uninstall" >&addonAction.disable;</button>
-        <button id="uninstall-btn" class="hide-on-uninstall" >&addonAction.uninstall;</button>
-        <button id="cancel-btn" class="show-on-uninstall" >&addonAction.undo;</button>
-      </div>
-    </div>
-  </div>
-
-  <script type="application/javascript" src="chrome://browser/content/aboutAddons.js"></script>
-</body>
-</html>
diff --git a/mobile/android/chrome/content/aboutCertError.xhtml b/mobile/android/chrome/content/aboutCertError.xhtml
deleted file mode 100644
index 4952af4fdb2d..000000000000
--- a/mobile/android/chrome/content/aboutCertError.xhtml
+++ /dev/null
@@ -1,152 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!DOCTYPE html [
-  <!ENTITY % htmlDTD
-    PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
-    "DTD/xhtml1-strict.dtd">
-  %htmlDTD;
-  <!ENTITY % globalDTD
-    SYSTEM "chrome://global/locale/global.dtd">
-  %globalDTD;
-  <!ENTITY % certerrorDTD
-    SYSTEM "chrome://browser/locale/aboutCertError.dtd">
-  %certerrorDTD;
-]>
-
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<html xmlns="http://www.w3.org/1999/xhtml">
-  <head>
-    <title>&certerror.pagetitle;</title>
-    <meta name="viewport" content="width=device-width; user-scalable=false" />
-    <link rel="stylesheet" href="chrome://browser/skin/netError.css" media="all" />
-    <!-- This page currently uses the same favicon as neterror.xhtml.
-         If the location of the favicon is changed for both pages, the
-         FAVICON_ERRORPAGE_URL symbol in toolkit/components/places/src/nsFaviconService.h
-         should be updated. If this page starts using a different favicon
-         than neterrorm nsFaviconService->SetAndLoadFaviconForPage
-         should be updated to ignore this one as well. -->
-    <link rel="icon" type="image/png" id="favicon" sizes="64x64" href="chrome://browser/skin/images/certerror-warning.png"/>
-
-    <script type="application/javascript"><![CDATA[
-      // Error url MUST be formatted like this:
-      //   about:certerror?e=error&u=url&d=desc
-
-      // Note that this file uses document.documentURI to get
-      // the URL (with the format from above). This is because
-      // document.location.href gets the current URI off the docshell,
-      // which is the URL displayed in the location bar, i.e.
-      // the URI that the user attempted to load.
-
-      function getCSSClass() {
-        var url = document.documentURI;
-        var matches = url.match(/s\=([^&]+)\&/);
-        // s is optional, if no match just return nothing
-        if (!matches || matches.length < 2)
-          return "";
-
-        // parenthetical match is the second entry
-        return decodeURIComponent(matches[1]);
-      }
-
-      function initPage() {
-        // Replace the "#1" string in the intro with the hostname.  Trickier
-        // than it might seem since we want to preserve the <b> tags, but
-        // not allow for any injection by just using innerHTML.  Instead,
-        // just find the right target text node.
-        var intro = document.getElementById("introContentP1");
-        function replaceWithHost(node) {
-          if (node.textContent == "#1")
-            node.textContent = location.host;
-          else
-            for (var i = 0; i < node.childNodes.length; i++)
-              replaceWithHost(node.childNodes[i]);
-        }
-        replaceWithHost(intro);
-
-        if (getCSSClass() == "expertBadCert") {
-          toggle("technicalContent");
-          toggle("expertContent");
-        }
-
-        // Disallow overrides if this is a Strict-Transport-Security
-        // host and the cert is bad (STS Spec section 7.3) or if the
-        // certerror is in a frame (bug 633691).
-        if (getCSSClass() == "badStsCert" || window != top)
-          document.getElementById("expertContent").setAttribute("hidden", "true");
-
-        var event = new CustomEvent("AboutCertErrorLoad", {bubbles: true});
-        document.dispatchEvent(event);
-      }
-
-      function createLink(el, id, text) {
-        var anchorEl = document.createElement("a");
-        anchorEl.setAttribute("id", id);
-        anchorEl.setAttribute("title", text);
-        anchorEl.appendChild(document.createTextNode(text));
-        el.appendChild(anchorEl);
-      }
-
-      function toggle(id) {
-        var el = document.getElementById(id);
-        if (el.hasAttribute("collapsed"))
-          el.removeAttribute("collapsed");
-        else
-          el.setAttribute("collapsed", true);
-      }
-    ]]></script>
-  </head>
-
-  <body id="errorPage" class="certerror" dir="&locale.dir;">
-
-    <!-- PAGE CONTAINER (for styling purposes only) -->
-    <div id="errorPageContainer">
-
-      <!-- Error Title -->
-      <div id="errorTitle">
-        <h1 class="errorTitleText">&certerror.longpagetitle;</h1>
-      </div>
-
-      <!-- LONG CONTENT (the section most likely to require scrolling) -->
-      <div id="errorLongContent">
-        <div id="introContent">
-          <p id="introContentP1">&certerror.introPara1;</p>
-        </div>
-
-        <div id="whatShouldIDoContent">
-          <h2>&certerror.whatShouldIDo.heading;</h2>
-          <div>
-            <p id="whatShouldIDoContentText">&certerror.whatShouldIDo.content;</p>
-            <button id="getMeOutOfHereButton">&certerror.getMeOutOfHere.label;</button>
-          </div>
-        </div>
-
-        <!-- The following sections can be unhidden by default by setting the
-             "browser.xul.error_pages.expert_bad_cert" pref to true -->
-        <div id="technicalContent" collapsed="true">
-          <h2 class="expander" onclick="toggle('technicalContent');" id="technicalContentHeading">&certerror.technical.heading;</h2>
-          <p id="technicalContentText"/>
-        </div>
-
-        <div id="expertContent" collapsed="true">
-          <h2 class="expander" onclick="toggle('expertContent');" id="expertContentHeading">&certerror.expert.heading;</h2>
-          <div>
-            <p>&certerror.expert.content;</p>
-            <p>&certerror.expert.contentPara2;</p>
-            <button id="temporaryExceptionButton">&certerror.addTemporaryException.label;</button>
-            <button id="permanentExceptionButton">&certerror.addPermanentException.label;</button>
-          </div>
-        </div>
-      </div>
-    </div>
-
-    <!--
-    - Note: It is important to run the script this way, instead of using
-    - an onload handler. This is because error pages are loaded as
-    - LOAD_BACKGROUND, which means that onload handlers will not be executed.
-    -->
-    <script type="application/javascript">initPage();</script>
-
-  </body>
-</html>
diff --git a/mobile/android/chrome/content/aboutDownloads.js b/mobile/android/chrome/content/aboutDownloads.js
deleted file mode 100644
index 1053b8d05ce7..000000000000
--- a/mobile/android/chrome/content/aboutDownloads.js
+++ /dev/null
@@ -1,427 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm", this);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Downloads",
-  "resource://gre/modules/Downloads.jsm"
-);
-ChromeUtils.defineModuleGetter(
-  this,
-  "DownloadUtils",
-  "resource://gre/modules/DownloadUtils.jsm"
-);
-ChromeUtils.defineModuleGetter(
-  this,
-  "EventDispatcher",
-  "resource://gre/modules/Messaging.jsm"
-);
-ChromeUtils.defineModuleGetter(this, "OS", "resource://gre/modules/osfile.jsm");
-ChromeUtils.defineModuleGetter(
-  this,
-  "PluralForm",
-  "resource://gre/modules/PluralForm.jsm"
-);
-ChromeUtils.defineModuleGetter(
-  this,
-  "Services",
-  "resource://gre/modules/Services.jsm"
-);
-
-var gStrings = Services.strings.createBundle(
-  "chrome://browser/locale/aboutDownloads.properties"
-);
-XPCOMUtils.defineLazyGetter(this, "strings", () =>
-  Services.strings.createBundle(
-    "chrome://browser/locale/aboutDownloads.properties"
-  )
-);
-
-function deleteDownload(download) {
-  download.finalize(true).catch(Cu.reportError);
-  OS.File.remove(download.target.path).catch(ex => {
-    if (!(ex instanceof OS.File.Error && ex.becauseNoSuchFile)) {
-      Cu.reportError(ex);
-    }
-  });
-}
-
-var contextMenu = {
-  _items: [],
-  _targetDownload: null,
-
-  init: function() {
-    let element = document.getElementById("downloadmenu");
-    element.addEventListener(
-      "click",
-      event => (event.download = this._targetDownload),
-      true
-    );
-    this._items = [
-      new ContextMenuItem(
-        "open",
-        download => download.succeeded,
-        download => download.launch().catch(Cu.reportError)
-      ),
-      new ContextMenuItem(
-        "retry",
-        download =>
-          download.error || (download.canceled && !download.hasPartialData),
-        download => download.start().catch(Cu.reportError)
-      ),
-      new ContextMenuItem(
-        "remove",
-        download => download.stopped,
-        download => {
-          Downloads.getList(Downloads.ALL)
-            .then(list => list.remove(download))
-            .catch(Cu.reportError);
-          deleteDownload(download);
-        }
-      ),
-      new ContextMenuItem(
-        "pause",
-        download => !download.stopped && download.hasPartialData,
-        download => download.cancel().catch(Cu.reportError)
-      ),
-      new ContextMenuItem(
-        "resume",
-        download => download.canceled && download.hasPartialData,
-        download => download.start().catch(Cu.reportError)
-      ),
-      new ContextMenuItem(
-        "cancel",
-        download =>
-          !download.stopped || (download.canceled && download.hasPartialData),
-        download => {
-          download.cancel().catch(Cu.reportError);
-          download.removePartialData().catch(Cu.reportError);
-        }
-      ),
-      // following menu item is a global action
-      new ContextMenuItem(
-        "removeall",
-        () => downloadLists.finished.length > 0,
-        () => downloadLists.removeFinished()
-      ),
-    ];
-  },
-
-  addContextMenuEventListener: function(element) {
-    element.addEventListener("contextmenu", this.onContextMenu.bind(this));
-  },
-
-  onContextMenu: function(event) {
-    let target = event.target;
-    while (target && !target.download) {
-      target = target.parentNode;
-    }
-    if (!target) {
-      Cu.reportError("No download found for context menu target");
-      event.preventDefault();
-      return;
-    }
-
-    // capture the target download for menu items to use in a click event
-    this._targetDownload = target.download;
-    for (let item of this._items) {
-      item.updateVisibility(target.download);
-    }
-  },
-};
-
-function ContextMenuItem(name, isVisible, action) {
-  this.element = document.getElementById("contextmenu-" + name);
-  this.isVisible = isVisible;
-
-  this.element.addEventListener("click", event => action(event.download));
-}
-
-ContextMenuItem.prototype = {
-  updateVisibility: function(download) {
-    this.element.hidden = !this.isVisible(download);
-  },
-};
-
-function DownloadListView(type, listElementId) {
-  this.listElement = document.getElementById(listElementId);
-  contextMenu.addContextMenuEventListener(this.listElement);
-
-  this.items = new Map();
-
-  Downloads.getList(type)
-    .then(list => list.addView(this))
-    .catch(Cu.reportError);
-
-  window.addEventListener("unload", event => {
-    Downloads.getList(type)
-      .then(list => list.removeView(this))
-      .catch(Cu.reportError);
-  });
-}
-
-DownloadListView.prototype = {
-  get finished() {
-    let finished = [];
-    for (let download of this.items.keys()) {
-      if (download.stopped && (!download.hasPartialData || download.error)) {
-        finished.push(download);
-      }
-    }
-
-    return finished;
-  },
-
-  insertOrMoveItem: function(item) {
-    var compare = (a, b) => {
-      // active downloads always before stopped downloads
-      if (a.stopped != b.stopped) {
-        return b.stopped ? -1 : 1;
-      }
-      // most recent downloads first
-      return b.startTime - a.startTime;
-    };
-
-    let insertLocation = this.listElement.firstChild;
-    while (
-      insertLocation &&
-      compare(item.download, insertLocation.download) > 0
-    ) {
-      insertLocation = insertLocation.nextElementSibling;
-    }
-    this.listElement.insertBefore(item.element, insertLocation);
-  },
-
-  onDownloadAdded: function(download) {
-    let item = new DownloadItem(download);
-    this.items.set(download, item);
-    this.insertOrMoveItem(item);
-  },
-
-  onDownloadChanged: function(download) {
-    let item = this.items.get(download);
-    if (!item) {
-      Cu.reportError("No DownloadItem found for download");
-      return;
-    }
-
-    if (item.stateChanged) {
-      this.insertOrMoveItem(item);
-    }
-
-    item.onDownloadChanged();
-  },
-
-  onDownloadRemoved: function(download) {
-    let item = this.items.get(download);
-    if (!item) {
-      Cu.reportError("No DownloadItem found for download");
-      return;
-    }
-
-    this.items.delete(download);
-    this.listElement.removeChild(item.element);
-
-    EventDispatcher.instance.sendRequest({
-      type: "Download:Remove",
-      path: download.target.path,
-    });
-  },
-};
-
-var downloadLists = {
-  init: function() {
-    this.publicDownloads = new DownloadListView(
-      Downloads.PUBLIC,
-      "public-downloads-list"
-    );
-    this.privateDownloads = new DownloadListView(
-      Downloads.PRIVATE,
-      "private-downloads-list"
-    );
-  },
-
-  get finished() {
-    return this.publicDownloads.finished.concat(this.privateDownloads.finished);
-  },
-
-  removeFinished: function() {
-    let finished = this.finished;
-    if (finished.length == 0) {
-      return;
-    }
-
-    let title = strings.GetStringFromName("downloadAction.deleteAll");
-    let messageForm = strings.GetStringFromName("downloadMessage.deleteAll");
-    let message = PluralForm.get(finished.length, messageForm).replace(
-      "#1",
-      finished.length
-    );
-
-    if (Services.prompt.confirm(null, title, message)) {
-      Downloads.getList(Downloads.ALL).then(list => {
-        for (let download of finished) {
-          list.remove(download).catch(Cu.reportError);
-          deleteDownload(download);
-        }
-      }, Cu.reportError);
-    }
-  },
-};
-
-function DownloadItem(download) {
-  this._download = download;
-  this._updateFromDownload();
-
-  this._domain = DownloadUtils.getURIHost(download.source.url)[0];
-  this._fileName = this._htmlEscape(OS.Path.basename(download.target.path));
-  this._iconUrl = "moz-icon://" + this._fileName + "?size=64";
-  this._startDate = this._htmlEscape(
-    DownloadUtils.getReadableDates(download.startTime)[0]
-  );
-
-  this._element = this.createElement();
-}
-
-const kDownloadStatePropertyNames = [
-  "stopped",
-  "succeeded",
-  "canceled",
-  "error",
-  "startTime",
-];
-
-DownloadItem.prototype = {
-  _htmlEscape: function(s) {
-    s = s.replace(/&/g, "&amp;");
-    s = s.replace(/>/g, "&gt;");
-    s = s.replace(/</g, "&lt;");
-    s = s.replace(/"/g, "&quot;");
-    s = s.replace(/'/g, "&apos;");
-    return s;
-  },
-
-  _updateFromDownload: function() {
-    this._state = {};
-    kDownloadStatePropertyNames.forEach(
-      name => (this._state[name] = this._download[name]),
-      this
-    );
-  },
-
-  get stateChanged() {
-    return kDownloadStatePropertyNames.some(
-      name => this._state[name] != this._download[name],
-      this
-    );
-  },
-
-  get download() {
-    return this._download;
-  },
-  get element() {
-    return this._element;
-  },
-
-  createElement: function() {
-    let template = document.getElementById("download-item");
-    // TODO: use this once <template> is working
-    // let element = document.importNode(template.content, true);
-
-    // simulate a <template> node...
-    let element = template.cloneNode(true);
-    element.removeAttribute("id");
-    element.removeAttribute("style");
-
-    // launch the download if clicked
-    element.addEventListener("click", this.onClick.bind(this));
-
-    // set download as an expando property for the context menu
-    element.download = this.download;
-
-    // fill in template placeholders
-    this.updateElement(element);
-
-    return element;
-  },
-
-  updateElement: function(element) {
-    element.querySelector(".date").textContent = this.startDate;
-    element.querySelector(".domain").textContent = this.domain;
-    element.querySelector(".icon").src = this.iconUrl;
-    element.querySelector(".size").textContent = this.size;
-    element.querySelector(".state").textContent = this.stateDescription;
-    element.querySelector(".title").setAttribute("value", this.fileName);
-  },
-
-  onClick: function(event) {
-    if (this.download.succeeded) {
-      this.download.launch().catch(Cu.reportError);
-    }
-  },
-
-  onDownloadChanged: function() {
-    this._updateFromDownload();
-    this.updateElement(this.element);
-  },
-
-  // template properties below
-  get domain() {
-    return this._domain;
-  },
-  get fileName() {
-    return this._fileName;
-  },
-  get id() {
-    return this._id;
-  },
-  get iconUrl() {
-    return this._iconUrl;
-  },
-
-  get size() {
-    if (this.download.succeeded && this.download.target.exists) {
-      return DownloadUtils.convertByteUnits(this.download.target.size).join("");
-    } else if (this.download.hasProgress) {
-      return DownloadUtils.convertByteUnits(this.download.totalBytes).join("");
-    }
-    return strings.GetStringFromName("downloadState.unknownSize");
-  },
-
-  get startDate() {
-    return this._startDate;
-  },
-
-  get stateDescription() {
-    let name;
-    if (this.download.error) {
-      name = "downloadState.failed";
-    } else if (this.download.canceled) {
-      if (this.download.hasPartialData) {
-        name = "downloadState.paused";
-      } else {
-        name = "downloadState.canceled";
-      }
-    } else if (!this.download.stopped) {
-      if (this.download.currentBytes > 0) {
-        name = "downloadState.downloading";
-      } else {
-        name = "downloadState.starting";
-      }
-    }
-
-    if (name) {
-      return strings.GetStringFromName(name);
-    }
-    return "";
-  },
-};
-
-window.addEventListener("DOMContentLoaded", event => {
-  contextMenu.init();
-  downloadLists.init();
-});
diff --git a/mobile/android/chrome/content/aboutDownloads.xhtml b/mobile/android/chrome/content/aboutDownloads.xhtml
deleted file mode 100644
index ac4e7220950b..000000000000
--- a/mobile/android/chrome/content/aboutDownloads.xhtml
+++ /dev/null
@@ -1,62 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
-  "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd" [
-<!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd" >
-%brandDTD;
-<!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd" >
-%globalDTD;
-<!ENTITY % downloadsDTD SYSTEM "chrome://browser/locale/aboutDownloads.dtd" >
-%downloadsDTD;
-]>
-
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this file,
-   - You can obtain one at http://mozilla.org/MPL/2.0/.  -->
-
-<html xmlns="http://www.w3.org/1999/xhtml"
-      xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
-<head>
-  <title>&aboutDownloads.title;</title>
-  <meta name="viewport" content="width=device-width; user-scalable=0" />
-  <link rel="icon" type="image/png" sizes="64x64" href="chrome://branding/content/favicon64.png" />
-  <link rel="stylesheet" href="chrome://browser/skin/aboutBase.css" type="text/css"/>
-  <link rel="stylesheet" href="chrome://browser/skin/aboutDownloads.css" type="text/css"/>
-</head>
-
-<body dir="&locale.dir;">
-  <menu type="context" id="downloadmenu">
-    <menuitem id="contextmenu-open" label="&aboutDownloads.open;"></menuitem>
-    <menuitem id="contextmenu-retry" label="&aboutDownloads.retry;"></menuitem>
-    <menuitem id="contextmenu-remove" label="&aboutDownloads.remove;"></menuitem>
-    <menuitem id="contextmenu-pause" label="&aboutDownloads.pause;"></menuitem>
-    <menuitem id="contextmenu-resume" label="&aboutDownloads.resume;"></menuitem>
-    <menuitem id="contextmenu-cancel" label="&aboutDownloads.cancel;"></menuitem>
-    <menuitem id="contextmenu-removeall" label="&aboutDownloads.removeAll;"></menuitem>
-  </menu>
-
-  <!--template id="download-item"-->
-    <li id="download-item" class="list-item" role="button" contextmenu="downloadmenu" style="display: none">
-      <img class="icon" src=""/>
-      <div class="details">
-        <div class="row">
-          <!-- This is a hack so that we can crop this label in its center -->
-          <xul:label class="title" crop="center" value=""/>
-          <div class="date"></div>
-        </div>
-        <div class="size"></div>
-        <div class="domain"></div>
-        <div class="state"></div>
-      </div>
-    </li>
-  <!--/template-->
-
-  <div class="header">
-    <div>&aboutDownloads.header;</div>
-  </div>
-  <ul id="private-downloads-list" class="list"></ul>
-  <ul id="public-downloads-list" class="list"></ul>
-  <span id="no-downloads-indicator">&aboutDownloads.empty;</span>
-  <script type="application/javascript" src="chrome://browser/content/aboutDownloads.js"/>
-</body>
-</html>
diff --git a/mobile/android/chrome/content/aboutExperiments.js b/mobile/android/chrome/content/aboutExperiments.js
deleted file mode 100644
index bad7df31c476..000000000000
--- a/mobile/android/chrome/content/aboutExperiments.js
+++ /dev/null
@@ -1,127 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
-const { XPCOMUtils } = ChromeUtils.import(
-  "resource://gre/modules/XPCOMUtils.jsm"
-);
-
-XPCOMUtils.defineLazyModuleGetters(this, {
-  AndroidLog: "resource://gre/modules/AndroidLog.jsm",
-  EventDispatcher: "resource://gre/modules/Messaging.jsm",
-});
-
-const LOGTAG = "Experiments";
-const EXPERIMENTS_CONFIGURATION =
-  "https://firefox.settings.services.mozilla.com/v1/buckets/fennec/collections/experiments/records";
-const Experiments = Services.wm.getMostRecentWindow("navigator:browser")
-  .Experiments;
-
-document.addEventListener("DOMContentLoaded", initList);
-
-function log(msg) {
-  AndroidLog.d(LOGTAG, msg);
-}
-
-function initList() {
-  const list = document.getElementById("list");
-  list.addEventListener("click", toggleOverride);
-
-  Promise.all([
-    promiseEnabledExperiments(),
-    promiseExperimentsConfiguration(),
-  ]).then(values => {
-    const enabledExperiments = values[0];
-    const serverConfiguration = values[1];
-
-    serverConfiguration.data.forEach(function(experiment) {
-      try {
-        let item = document.createElement("li");
-        item.textContent = experiment.name;
-        item.setAttribute("name", experiment.name);
-        item.setAttribute(
-          "isEnabled",
-          enabledExperiments.includes(experiment.name)
-        );
-        list.appendChild(item);
-      } catch (e) {
-        log(`Error while setting experiments list: ${e.error}`);
-      }
-    });
-  });
-}
-
-function toggleOverride(experiment) {
-  const item = experiment.originalTarget;
-  const name = item.getAttribute("name");
-  const isEnabled = item.getAttribute("isEnabled") === "true";
-
-  log(`toggleOverride: ${name}`);
-
-  Experiments.setOverride(name, !isEnabled);
-  item.setAttribute("isEnabled", !isEnabled);
-}
-
-/**
- * Get the list of locally enabled experiments.
- */
-function promiseEnabledExperiments() {
-  log("Getting the locally enabled experiments");
-
-  return EventDispatcher.instance
-    .sendRequestForResult({
-      type: "Experiments:GetActive",
-    })
-    .then(experiments => {
-      log("List of locally enabled experiments ready");
-      return experiments;
-    });
-}
-
-/**
- * Fetch the list of experiments from server configuration.
- */
-function promiseExperimentsConfiguration() {
-  log("Fetching server experiments");
-
-  return new Promise((resolve, reject) => {
-    const xhr = new XMLHttpRequest();
-
-    try {
-      xhr.open("GET", EXPERIMENTS_CONFIGURATION, true);
-    } catch (e) {
-      reject(`Error opening request: ${e}`);
-      return;
-    }
-
-    xhr.onerror = function(e) {
-      reject(`Error making request: ${e.error}`);
-    };
-
-    xhr.onload = function(event) {
-      if (xhr.readyState === 4) {
-        if (xhr.status === 200) {
-          try {
-            resolve(JSON.parse(xhr.responseText));
-          } catch (e) {
-            const errorMessage = `Error while parsing request: ${e}`;
-            log(errorMessage);
-            reject(errorMessage);
-          }
-        } else {
-          const errorMessage = `Request to ${url} returned status ${
-            xhr.status
-          }`;
-          log(errorMessage);
-          reject(errorMessage);
-        }
-      }
-      log("Finished fetching server experiments");
-    };
-
-    xhr.send(null);
-  });
-}
diff --git a/mobile/android/chrome/content/aboutExperiments.xhtml b/mobile/android/chrome/content/aboutExperiments.xhtml
deleted file mode 100644
index 1f2e9801866a..000000000000
--- a/mobile/android/chrome/content/aboutExperiments.xhtml
+++ /dev/null
@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-- License, v. 2.0. If a copy of the MPL was not distributed with this
-- file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-
-<html xmlns="http://www.w3.org/1999/xhtml">
-  <head>
-    <title>Switchboard Experiments</title>
-    <meta name="viewport" content="width=device-width; user-scalable=0" />
-    <link rel="stylesheet" href="chrome://browser/skin/aboutBase.css" type="text/css"/>
-    <link rel="stylesheet" href="chrome://browser/skin/aboutExperiments.css" type="text/css"/>
-    <script type="application/javascript" src="chrome://browser/content/aboutExperiments.js"></script>
-  </head>
-
-  <body>
-    <ul id="list"/>
-  </body>
-</html>
diff --git a/mobile/android/chrome/content/aboutHome.xhtml b/mobile/android/chrome/content/aboutHome.xhtml
deleted file mode 100644
index 692eac2ec9ce..000000000000
--- a/mobile/android/chrome/content/aboutHome.xhtml
+++ /dev/null
@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!DOCTYPE html [
-  <!ENTITY % htmlDTD PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
-  %htmlDTD;
-  <!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd" >
-  %brandDTD;
-  <!ENTITY % abouthomeDTD SYSTEM "chrome://browser/locale/aboutHome.dtd">
-  %abouthomeDTD;
-]>
-
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-
-<html xmlns="http://www.w3.org/1999/xhtml">
-<head>
-  <title>&abouthome.title;</title>
-</head>
-<body>
-</body>
-</html>
diff --git a/mobile/android/chrome/content/aboutLogins.js b/mobile/android/chrome/content/aboutLogins.js
deleted file mode 100644
index f78acc3e582e..000000000000
--- a/mobile/android/chrome/content/aboutLogins.js
+++ /dev/null
@@ -1,628 +0,0 @@
-/* Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-ChromeUtils.import(
-  "resource://services-common/utils.js"
-); /* global: CommonUtils */
-const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
-const { XPCOMUtils } = ChromeUtils.import(
-  "resource://gre/modules/XPCOMUtils.jsm"
-);
-const { Accounts } = ChromeUtils.import("resource://gre/modules/Accounts.jsm");
-
-XPCOMUtils.defineLazyGetter(
-  window,
-  "gChromeWin",
-  () => window.docShell.rootTreeItem.domWindow
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "EventDispatcher",
-  "resource://gre/modules/Messaging.jsm"
-);
-ChromeUtils.defineModuleGetter(
-  this,
-  "Snackbars",
-  "resource://gre/modules/Snackbars.jsm"
-);
-ChromeUtils.defineModuleGetter(
-  this,
-  "Prompt",
-  "resource://gre/modules/Prompt.jsm"
-);
-
-var debug = ChromeUtils.import(
-  "resource://gre/modules/AndroidLog.jsm",
-  {}
-).AndroidLog.d.bind(null, "AboutLogins");
-
-var gStringBundle = Services.strings.createBundle(
-  "chrome://browser/locale/aboutLogins.properties"
-);
-
-function copyStringShowSnackbar(string, notifyString) {
-  try {
-    let clipboard = Cc["@mozilla.org/widget/clipboardhelper;1"].getService(
-      Ci.nsIClipboardHelper
-    );
-    clipboard.copyString(string);
-    Snackbars.show(notifyString, Snackbars.LENGTH_LONG);
-  } catch (e) {
-    debug("Error copying from about:logins");
-    Snackbars.show(
-      gStringBundle.GetStringFromName("loginsDetails.copyFailed"),
-      Snackbars.LENGTH_LONG
-    );
-  }
-}
-
-// Delay filtering while typing in MS
-const FILTER_DELAY = 500;
-
-var Logins = {
-  _logins: [],
-  _filterTimer: null,
-  _selectedLogin: null,
-
-  // Load the logins list, displaying interstitial UI (see
-  // #logins-list-loading-body) while loading.  There are careful
-  // jank-avoiding measures taken in this function; be careful when
-  // modifying it!
-  //
-  // Returns a Promise that resolves to the list of logins, ordered by
-  // origin.
-  _promiseLogins: function() {
-    let contentBody = document.getElementById("content-body");
-    let emptyBody = document.getElementById("empty-body");
-    let filterIcon = document.getElementById("filter-button");
-
-    let showSpinner = () => {
-      this._toggleListBody(true);
-      emptyBody.classList.add("hidden");
-    };
-
-    let getAllLogins = () => {
-      let logins = [];
-      try {
-        logins = Services.logins.getAllLogins();
-      } catch (e) {
-        // It's likely that the Master Password was not entered; give
-        // a hint to the next person.
-        throw new Error(
-          "Possible Master Password permissions error: " + e.toString()
-        );
-      }
-
-      logins.sort((a, b) => a.origin.localeCompare(b.origin));
-
-      return logins;
-    };
-
-    let hideSpinner = logins => {
-      this._toggleListBody(false);
-
-      if (!logins.length) {
-        contentBody.classList.add("hidden");
-        filterIcon.classList.add("hidden");
-        emptyBody.classList.remove("hidden");
-      } else {
-        contentBody.classList.remove("hidden");
-        emptyBody.classList.add("hidden");
-      }
-
-      return logins;
-    };
-
-    // Return a promise that is resolved after a paint.
-    let waitForPaint = () => {
-      // We're changing 'display'.  We need to wait for the new value to take
-      // effect; otherwise, we'll block and never paint a change.  Since
-      // requestAnimationFrame callback is generally triggered *before* any
-      // style flush and layout, we wait for two animation frames.  This
-      // approach was cribbed from
-      // https://dxr.mozilla.org/mozilla-central/rev/5abe3c4deab94270440422c850bbeaf512b1f38d/browser/base/content/browser-fullScreen.js?offset=0#469.
-      return new Promise(function(resolve, reject) {
-        requestAnimationFrame(() => {
-          requestAnimationFrame(() => {
-            resolve();
-          });
-        });
-      });
-    };
-
-    // getAllLogins janks the main-thread.  We need to paint before that jank;
-    // by throwing the janky load onto the next tick, we paint the spinner; the
-    // spinner is CSS animated off-main-thread.
-    return Promise.resolve()
-      .then(showSpinner)
-      .then(waitForPaint)
-      .then(getAllLogins)
-      .then(hideSpinner);
-  },
-
-  // Reload the logins list, displaying interstitial UI while loading.
-  // Update the stored and displayed list upon completion.
-  _reloadList: function() {
-    this._promiseLogins()
-      .then(logins => {
-        this._logins = logins;
-        this._loadList(logins);
-      })
-      .catch(e => {
-        // There's no way to recover from errors, sadly.  Log and make
-        // it obvious that something is up.
-        this._logins = [];
-        debug("Failed to _reloadList!");
-        Cu.reportError(e);
-      });
-  },
-
-  _toggleListBody: function(isLoading) {
-    let contentBody = document.getElementById("content-body");
-    let loadingBody = document.getElementById("logins-list-loading-body");
-
-    if (isLoading) {
-      contentBody.classList.add("hidden");
-      loadingBody.classList.remove("hidden");
-    } else {
-      loadingBody.classList.add("hidden");
-      contentBody.classList.remove("hidden");
-    }
-  },
-
-  init: function() {
-    window.addEventListener("popstate", this);
-
-    Services.obs.addObserver(this, "passwordmgr-storage-changed");
-    document
-      .getElementById("update-btn")
-      .addEventListener("click", this._onSaveEditLogin.bind(this));
-    document
-      .getElementById("password-btn")
-      .addEventListener("click", this._onPasswordBtn.bind(this));
-
-    let filterInput = document.getElementById("filter-input");
-    let filterContainer = document.getElementById("filter-input-container");
-
-    filterInput.addEventListener("input", event => {
-      // Stop any in-progress filter timer
-      if (this._filterTimer) {
-        clearTimeout(this._filterTimer);
-        this._filterTimer = null;
-      }
-
-      // Start a new timer
-      this._filterTimer = setTimeout(() => {
-        this._filter(event);
-      }, FILTER_DELAY);
-    });
-
-    filterInput.addEventListener("blur", event => {
-      filterContainer.setAttribute("hidden", true);
-    });
-
-    document
-      .getElementById("filter-button")
-      .addEventListener("click", event => {
-        filterContainer.removeAttribute("hidden");
-        filterInput.focus();
-      });
-
-    document.getElementById("filter-clear").addEventListener("click", event => {
-      // Stop any in-progress filter timer
-      if (this._filterTimer) {
-        clearTimeout(this._filterTimer);
-        this._filterTimer = null;
-      }
-
-      filterInput.blur();
-      filterInput.value = "";
-      this._loadList(this._logins);
-    });
-
-    this._showList();
-
-    this._updatePasswordBtn(true);
-
-    this._reloadList();
-  },
-
-  uninit: function() {
-    Services.obs.removeObserver(this, "passwordmgr-storage-changed");
-    window.removeEventListener("popstate", this);
-  },
-
-  _loadList: function(logins) {
-    let list = document.getElementById("logins-list");
-    let newList = list.cloneNode(false);
-
-    logins.forEach(login => {
-      let item = this._createItemForLogin(login);
-      newList.appendChild(item);
-    });
-
-    list.parentNode.replaceChild(newList, list);
-  },
-
-  _showList: function() {
-    let loginsListPage = document.getElementById("logins-list-page");
-    loginsListPage.classList.remove("hidden");
-
-    let editLoginPage = document.getElementById("edit-login-page");
-    editLoginPage.classList.add("hidden");
-
-    // If the Show/Hide password button has been flipped, reset it
-    if (this._isPasswordBtnInHideMode()) {
-      this._updatePasswordBtn(true);
-    }
-  },
-
-  _onPopState: function(event) {
-    // Called when back/forward is used to change the state of the page
-    if (event.state) {
-      this._showEditLoginDialog(event.state.id);
-    } else {
-      this._selectedLogin = null;
-      this._showList();
-    }
-  },
-  _showEditLoginDialog: function(login) {
-    let listPage = document.getElementById("logins-list-page");
-    listPage.classList.add("hidden");
-
-    let editLoginPage = document.getElementById("edit-login-page");
-    editLoginPage.classList.remove("hidden");
-
-    let usernameField = document.getElementById("username");
-    usernameField.value = login.username;
-    let passwordField = document.getElementById("password");
-    passwordField.value = login.password;
-    let domainField = document.getElementById("origin");
-    domainField.value = login.origin;
-
-    let img = document.getElementById("favicon");
-    this._loadFavicon(img, login.origin);
-
-    let headerText = document.getElementById("edit-login-header-text");
-    if (login.origin && login.origin != "") {
-      headerText.textContent = login.origin;
-    } else {
-      headerText.textContent = gStringBundle.GetStringFromName(
-        "editLogin.fallbackTitle"
-      );
-    }
-
-    passwordField.addEventListener("input", event => {
-      let newPassword = passwordField.value;
-      let updateBtn = document.getElementById("update-btn");
-
-      if (newPassword === "") {
-        updateBtn.disabled = true;
-        updateBtn.classList.add("disabled-btn");
-      } else if (newPassword !== "" && updateBtn.disabled === true) {
-        updateBtn.disabled = false;
-        updateBtn.classList.remove("disabled-btn");
-      }
-    });
-  },
-
-  _onSaveEditLogin: function() {
-    let newUsername = document.getElementById("username").value;
-    let newPassword = document.getElementById("password").value;
-    let origUsername = this._selectedLogin.username;
-    let origPassword = this._selectedLogin.password;
-
-    try {
-      if (newUsername === origUsername && newPassword === origPassword) {
-        Snackbars.show(
-          gStringBundle.GetStringFromName("editLogin.saved1"),
-          Snackbars.LENGTH_LONG
-        );
-        this._showList();
-        return;
-      }
-
-      let logins = Services.logins.findLogins(
-        this._selectedLogin.origin,
-        this._selectedLogin.formActionOrigin,
-        this._selectedLogin.httpRealm
-      );
-
-      for (let i = 0; i < logins.length; i++) {
-        if (logins[i].username == origUsername) {
-          let propBag = Cc["@mozilla.org/hash-property-bag;1"].createInstance(
-            Ci.nsIWritablePropertyBag
-          );
-          if (newUsername !== origUsername) {
-            propBag.setProperty("username", newUsername);
-          }
-          if (newPassword !== origPassword) {
-            propBag.setProperty("password", newPassword);
-          }
-          // Sync relies on timePasswordChanged to decide whether
-          // or not to sync a login, so touch it.
-          propBag.setProperty("timePasswordChanged", Date.now());
-          Services.logins.modifyLogin(logins[i], propBag);
-          break;
-        }
-      }
-    } catch (e) {
-      Snackbars.show(
-        gStringBundle.GetStringFromName("editLogin.couldNotSave"),
-        Snackbars.LENGTH_LONG
-      );
-      return;
-    }
-    Snackbars.show(
-      gStringBundle.GetStringFromName("editLogin.saved1"),
-      Snackbars.LENGTH_LONG
-    );
-    this._showList();
-  },
-
-  _onPasswordBtn: function() {
-    this._updatePasswordBtn(this._isPasswordBtnInHideMode());
-  },
-
-  _updatePasswordBtn: function(aShouldShow) {
-    let passwordField = document.getElementById("password");
-    let button = document.getElementById("password-btn");
-    let show = gStringBundle.GetStringFromName("password-btn.show");
-    let hide = gStringBundle.GetStringFromName("password-btn.hide");
-    if (aShouldShow) {
-      passwordField.type = "password";
-      button.textContent = show;
-      button.classList.remove("password-btn-hide");
-    } else {
-      passwordField.type = "text";
-      button.textContent = hide;
-      button.classList.add("password-btn-hide");
-    }
-  },
-
-  _isPasswordBtnInHideMode: function() {
-    let button = document.getElementById("password-btn");
-    return button.classList.contains("password-btn-hide");
-  },
-
-  _showPassword: function(password) {
-    let passwordPrompt = new Prompt({
-      window: window,
-      message: password,
-      buttons: [
-        gStringBundle.GetStringFromName("loginsDialog.copy"),
-        gStringBundle.GetStringFromName("loginsDialog.cancel"),
-      ],
-    }).show(data => {
-      switch (data.button) {
-        case 0:
-          // Corresponds to "Copy password" button.
-          copyStringShowSnackbar(
-            password,
-            gStringBundle.GetStringFromName("loginsDetails.passwordCopied")
-          );
-      }
-    });
-  },
-
-  _onLoginClick: function(event) {
-    let loginItem = event.currentTarget;
-    let login = loginItem.login;
-    if (!login) {
-      debug("No login!");
-      return;
-    }
-
-    let prompt = new Prompt({
-      window: window,
-    });
-    let menuItems = [
-      { label: gStringBundle.GetStringFromName("loginsMenu.showPassword") },
-      { label: gStringBundle.GetStringFromName("loginsMenu.copyPassword") },
-      { label: gStringBundle.GetStringFromName("loginsMenu.copyUsername") },
-      { label: gStringBundle.GetStringFromName("loginsMenu.editLogin") },
-      { label: gStringBundle.GetStringFromName("loginsMenu.delete") },
-      { label: gStringBundle.GetStringFromName("loginsMenu.deleteAll") },
-    ];
-
-    prompt.setSingleChoiceItems(menuItems);
-    prompt.show(data => {
-      // Switch on indices of buttons, as they were added when creating login item.
-      switch (data.button) {
-        case 0:
-          this._showPassword(login.password);
-          break;
-        case 1:
-          copyStringShowSnackbar(
-            login.password,
-            gStringBundle.GetStringFromName("loginsDetails.passwordCopied")
-          );
-          break;
-        case 2:
-          copyStringShowSnackbar(
-            login.username,
-            gStringBundle.GetStringFromName("loginsDetails.usernameCopied")
-          );
-          break;
-        case 3:
-          this._selectedLogin = login;
-          this._showEditLoginDialog(login);
-          history.pushState({ id: login.guid }, document.title);
-          break;
-        case 4:
-          Accounts.getFirefoxAccount().then(user => {
-            const promptMessage = user
-              ? gStringBundle.GetStringFromName(
-                  "loginsDialog.confirmDeleteForFxaUser"
-                )
-              : gStringBundle.GetStringFromName("loginsDialog.confirmDelete");
-            const confirmationMessage = gStringBundle.GetStringFromName(
-              "loginsDetails.deleted"
-            );
-
-            this._showConfirmationPrompt(
-              promptMessage,
-              confirmationMessage,
-              () => Services.logins.removeLogin(login)
-            );
-          });
-          break;
-        case 5:
-          Accounts.getFirefoxAccount().then(user => {
-            const promptMessage = user
-              ? gStringBundle.GetStringFromName(
-                  "loginsDialog.confirmDeleteAllForFxaUser"
-                )
-              : gStringBundle.GetStringFromName(
-                  "loginsDialog.confirmDeleteAll"
-                );
-            const confirmationMessage = gStringBundle.GetStringFromName(
-              "loginsDetails.deletedAll"
-            );
-
-            this._showConfirmationPrompt(
-              promptMessage,
-              confirmationMessage,
-              () => Services.logins.removeAllLogins()
-            );
-          });
-          break;
-      }
-    });
-  },
-
-  _showConfirmationPrompt: function(
-    promptMessage,
-    confirmationMessage,
-    actionToPerform
-  ) {
-    new Prompt({
-      window: window,
-      message: promptMessage,
-      buttons: [
-        // Use default, generic values
-        gStringBundle.GetStringFromName("loginsDialog.confirm"),
-        gStringBundle.GetStringFromName("loginsDialog.cancel"),
-      ],
-    }).show(data => {
-      switch (data.button) {
-        case 0:
-          // Corresponds to "confirm" button.
-
-          actionToPerform();
-
-          Snackbars.show(confirmationMessage, Snackbars.LENGTH_LONG);
-      }
-    });
-  },
-
-  _loadFavicon: function(aImg, aOrigin) {
-    // Load favicon from cache.
-    EventDispatcher.instance
-      .sendRequestForResult({
-        type: "Favicon:Request",
-        url: aOrigin,
-        skipNetwork: true,
-      })
-      .then(
-        function(faviconUrl) {
-          aImg.style.backgroundImage = "url('" + faviconUrl + "')";
-          aImg.style.visibility = "visible";
-        },
-        function(data) {
-          debug("Favicon cache failure : " + data);
-          aImg.style.visibility = "visible";
-        }
-      );
-  },
-
-  _createItemForLogin: function(login) {
-    let loginItem = document.createElement("div");
-
-    loginItem.setAttribute("loginID", login.guid);
-    loginItem.className = "login-item list-item";
-
-    loginItem.addEventListener("click", this, true);
-    loginItem.addEventListener("contextmenu", this, true);
-
-    // Create item icon.
-    let img = document.createElement("div");
-    img.className = "icon";
-
-    this._loadFavicon(img, login.origin);
-    loginItem.appendChild(img);
-
-    // Create item details.
-    let inner = document.createElement("div");
-    inner.className = "inner";
-
-    let details = document.createElement("div");
-    details.className = "details";
-    inner.appendChild(details);
-
-    let titlePart = document.createElement("div");
-    titlePart.className = "origin";
-    titlePart.textContent = login.origin;
-    details.appendChild(titlePart);
-
-    let versionPart = document.createElement("div");
-    versionPart.textContent = login.httpRealm;
-    versionPart.className = "realm";
-    details.appendChild(versionPart);
-
-    let descPart = document.createElement("div");
-    descPart.textContent = login.username;
-    descPart.className = "username";
-    inner.appendChild(descPart);
-
-    loginItem.appendChild(inner);
-    loginItem.login = login;
-    return loginItem;
-  },
-
-  handleEvent: function(event) {
-    switch (event.type) {
-      case "popstate": {
-        this._onPopState(event);
-        break;
-      }
-      case "contextmenu":
-      case "click": {
-        this._onLoginClick(event);
-        break;
-      }
-    }
-  },
-
-  observe: function(subject, topic, data) {
-    switch (topic) {
-      case "passwordmgr-storage-changed": {
-        this._reloadList();
-        break;
-      }
-    }
-  },
-
-  _filter: function(event) {
-    let value = event.target.value.toLowerCase();
-    let logins = this._logins.filter(login => {
-      if (login.origin.toLowerCase().includes(value)) {
-        return true;
-      }
-      if (login.username && login.username.toLowerCase().includes(value)) {
-        return true;
-      }
-      if (login.httpRealm && login.httpRealm.toLowerCase().includes(value)) {
-        return true;
-      }
-      return false;
-    });
-
-    this._loadList(logins);
-  },
-};
-
-window.addEventListener("load", Logins.init.bind(Logins));
-window.addEventListener("unload", Logins.uninit.bind(Logins));
diff --git a/mobile/android/chrome/content/aboutLogins.xhtml b/mobile/android/chrome/content/aboutLogins.xhtml
deleted file mode 100644
index 849af6a331b3..000000000000
--- a/mobile/android/chrome/content/aboutLogins.xhtml
+++ /dev/null
@@ -1,90 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
-"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd" [
-<!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd" >
-%globalDTD;
-<!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd" >
-%brandDTD;
-<!ENTITY % aboutDTD SYSTEM "chrome://browser/locale/aboutLogins.dtd" >
-%aboutDTD;
-]>
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-- License, v. 2.0. If a copy of the MPL was not distributed with this
-- file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<html xmlns="http://www.w3.org/1999/xhtml">
-  <head>
-    <title>&aboutLogins.title;</title>
-    <meta name="viewport" content="width=device-width; user-scalable=0" />
-    <link rel="icon" type="image/png" sizes="64x64" href="chrome://branding/content/favicon64.png" />
-    <link rel="stylesheet" href="chrome://browser/skin/spinner.css" type="text/css"/>
-    <link rel="stylesheet" href="chrome://browser/skin/aboutBase.css" type="text/css"/>
-    <link rel="stylesheet" href="chrome://browser/skin/aboutLogins.css" type="text/css"/>
-    <script type="application/javascript" src="chrome://browser/content/aboutLogins.js"></script>
-  </head>
-  <body dir="&locale.dir;">
-
-    <div id="logins-list-page">
-      <div id="logins-header" class="header">
-        <div>&aboutLogins.title;</div>
-        <ul class="toolbar-buttons">
-          <li id="filter-button"></li>
-        </ul>
-      </div>
-      <div id="content-body">
-        <div id="logins-list" class="list"/>
-        <div id="filter-input-container" hidden="true">
-          <input id="filter-input" type="search"/>
-          <div id="filter-clear"/>
-        </div>
-      </div>
-      <div id="logins-list-loading-body" class="hidden">
-        <div id="loading-img-container">
-
-          <div id="spinner" class="mui-refresh-main">
-            <div class="mui-refresh-wrapper">
-              <div class="mui-spinner-wrapper">
-                <div class="mui-spinner-main">
-                  <div class="mui-spinner-left">
-                    <div class="mui-half-circle-left" />
-                  </div>
-                  <div class="mui-spinner-right">
-                    <div class="mui-half-circle-right" />
-                  </div>
-                </div>
-              </div>
-            </div>
-          </div>
-
-        </div>
-      </div>
-      <div id="empty-body" class="hidden">
-        <div id="empty-obj-text-container">
-          <object type="image/svg+xml" id="empty-icon" data="chrome://browser/skin/images/icon_key_emptypage.svg"/>
-          <div class="empty-text">&aboutLogins.emptyLoginText;</div>
-          <div class="empty-hint">&aboutLogins.emptyLoginHint;</div>
-        </div>
-      </div>
-    </div>
-
-    <div id="edit-login-page" class="hidden">
-      <div id="edit-login-header" class="header">
-        <div id="edit-login-header-text"/>
-      </div>
-      <div class="edit-login-div">
-        <div id="favicon" class="edit-login-icon"/>
-          <input type="text" name="origin" id="origin" class="edit-login-input" disabled="disabled"/>
-      </div>
-      <div class="edit-login-div">
-        <input type="text" name="username" id="username" class="edit-login-input" autocomplete="off"/>
-      </div>
-      <div class="edit-login-div">
-        <input type="password" id="password" name="password" value="password" class="edit-login-input" />
-        <button id="password-btn"></button>
-      </div>
-      <div class="edit-login-div">
-        <button id="update-btn" class="update-button">&aboutLogins.update;</button>
-      </div>
-    </div>
-
-  </body>
-</html>
diff --git a/mobile/android/chrome/content/aboutPrivateBrowsing.js b/mobile/android/chrome/content/aboutPrivateBrowsing.js
deleted file mode 100644
index ab0ee11c854a..000000000000
--- a/mobile/android/chrome/content/aboutPrivateBrowsing.js
+++ /dev/null
@@ -1,36 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this file,
- * You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-const { XPCOMUtils } = ChromeUtils.import(
-  "resource://gre/modules/XPCOMUtils.jsm"
-);
-ChromeUtils.import("resource://gre/modules/Services.jsm");
-const { PrivateBrowsingUtils } = ChromeUtils.import(
-  "resource://gre/modules/PrivateBrowsingUtils.jsm"
-);
-
-XPCOMUtils.defineLazyGetter(
-  window,
-  "gChromeWin",
-  () => window.docShell.rootTreeItem.domWindow
-);
-
-document.addEventListener("DOMContentLoaded", function() {
-  let BrowserApp = window.gChromeWin.BrowserApp;
-
-  if (!PrivateBrowsingUtils.isContentWindowPrivate(window)) {
-    document.body.setAttribute("class", "normal");
-    document
-      .getElementById("newPrivateTabLink")
-      .addEventListener("click", function() {
-        BrowserApp.addTab("about:privatebrowsing", {
-          selected: true,
-          parentId: BrowserApp.selectedTab.id,
-          isPrivate: true,
-        });
-      });
-  }
-});
diff --git a/mobile/android/chrome/content/aboutPrivateBrowsing.xhtml b/mobile/android/chrome/content/aboutPrivateBrowsing.xhtml
deleted file mode 100644
index 1fa8b19e56f0..000000000000
--- a/mobile/android/chrome/content/aboutPrivateBrowsing.xhtml
+++ /dev/null
@@ -1,43 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
--->
-<!DOCTYPE html [
-  <!ENTITY % htmlDTD PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
-  %htmlDTD;
-  <!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd" >
-  %brandDTD;
-  <!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd">
-  %globalDTD;
-  <!ENTITY % privatebrowsingpageDTD SYSTEM "chrome://browser/locale/aboutPrivateBrowsing.dtd">
-  %privatebrowsingpageDTD;
-]>
-
-<html xmlns="http://www.w3.org/1999/xhtml">
-  <head>
-    <title>&privatebrowsingpage.title;</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1; user-scalable=no"/>
-    <link rel="stylesheet" href="chrome://browser/skin/aboutPrivateBrowsing.css" type="text/css" media="all"/>
-    <link rel="icon" type="image/png" href="chrome://branding/content/favicon32.png" />
-    <script type="application/javascript" src="chrome://browser/content/aboutPrivateBrowsing.js"></script>
-  </head>
-
-  <body class="private" dir="&locale.dir;">
-    <img class="showPrivate masq" src="chrome://browser/skin/images/privatebrowsing-mask-and-shield.svg" />
-    <img class="showNormal masq" src="chrome://browser/skin/images/privatebrowsing-mask.png" />
-
-    <h1 class="showPrivate">&privatebrowsingpage.title;<br />&privatebrowsingpage.title.private;</h1>
-    <h1 class="showNormal">&privatebrowsingpage.title.normal1;</h1>
-
-    <div class="contentSection">
-      <p class="showPrivate">&privatebrowsingpage.description.trackingProtection;<br /><br />&privatebrowsingpage.description.privateDetails;</p>
-      <p class="showNormal">&privatebrowsingpage.description.normal2;</p>
-
-      <p class="showPrivate"><a href="https://support.mozilla.org/kb/private-browsing-firefox-android">&privatebrowsingpage.link.private;</a></p>
-      <p class="showNormal"><a href="#" id="newPrivateTabLink">&privatebrowsingpage.link.normal;</a></p>
-    </div>
-
-  </body>
-</html>
diff --git a/mobile/android/chrome/content/aboutRights.xhtml b/mobile/android/chrome/content/aboutRights.xhtml
deleted file mode 100644
index 089169099ebd..000000000000
--- a/mobile/android/chrome/content/aboutRights.xhtml
+++ /dev/null
@@ -1,95 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE html [
-    <!ENTITY % htmlDTD PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
-    %htmlDTD;
-    ]>
-
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-
-<html xmlns="http://www.w3.org/1999/xhtml">
-
-<head>
-  <title data-l10n-id="rights-title"></title>
-  <link rel="stylesheet" href="chrome://global/skin/in-content/info-pages.css" type="text/css"/>
-  <link rel="localization" href="branding/brand.ftl"/>
-  <link rel="localization" href="toolkit/about/aboutRights.ftl"/>
-</head>
-
-<body id="your-rights">
-<div class="container">
-  <h1 data-l10n-id="rights-title"></h1>
-
-  <p data-l10n-id="rights-intro"></p>
-
-  <ul>
-    <li data-l10n-id="rights-intro-point-1"><a href="http://www.mozilla.org/MPL/" data-l10n-name="mozilla-public-license-link"></a></li>
-  <!-- Point 2 discusses Mozilla trademarks, and isn't needed when the build is unbranded.
-    - Point 4 discusses privacy policy, unbranded builds get a placeholder (for the vendor to replace)
-    - Point 5 discusses web service terms, unbranded builds gets a placeholder (for the vendor to replace) -->
-    <li data-l10n-id="rights-intro-point-2"><a href="http://www.mozilla.org/foundation/trademarks/policy.html" data-l10n-name="mozilla-trademarks-link"></a></li>
-    <li data-l10n-id="rights-intro-point-3"></li>
-    <li data-l10n-id="rights-intro-point-4"><a href="https://www.mozilla.org/legal/privacy/firefox.html" data-l10n-name="mozilla-privacy-policy-link"></a></li>
-    <li data-l10n-id="rights-intro-point-5"><a href="about:rights#webservices" onclick="showServices();" data-l10n-name="mozilla-service-terms-link"></a></li>
-    <li data-l10n-id="rights-intro-point-6"></li>
-  </ul>
-
-  <div id="webservices-container">
-    <a name="webservices"/>
-    <h3 data-l10n-id="rights-webservices-header"></h3>
-
-    <p data-l10n-id="rights-webservices"><a href="about:rights#disabling-webservices" onclick="showDisablingServices();" id="showDisablingWebServices" data-l10n-name="mozilla-disable-service-link"></a></p>
-
-    <div id="disabling-webservices-container" style="margin-left:40px;">
-      <a name="disabling-webservices"/>
-      <!-- Safe Browsing cannot be disabled in Firefox Mobile; these instructions show how to do it on desktop
-      <p><strong>&rights.safebrowsing-a;</strong>&rights.safebrowsing-b;</p>
-      <ul>
-        <li>&rights.safebrowsing-term1;</li>
-        <li>&rights.safebrowsing-term2;</li>
-        <li>&rights2.safebrowsing-term3;</li>
-        <li>&rights.safebrowsing-term4;</li>
-      </ul>
-      -->
-
-      <p data-l10n-id="rights-locationawarebrowsing"></p>
-      <ul>
-        <li data-l10n-id="rights-locationawarebrowsing-term-1"></li>
-        <li data-l10n-id="rights-locationawarebrowsing-term-2"></li>
-        <li data-l10n-id="rights-locationawarebrowsing-term-3"></li>
-        <li data-l10n-id="rights-locationawarebrowsing-term-4"></li>
-      </ul>
-    </div>
-
-    <ol>
-      <!-- Terms only apply to official builds, unbranded builds get a placeholder. -->
-      <li data-l10n-id="rights-webservices-term-1"></li>
-      <li data-l10n-id="rights-webservices-term-2"></li>
-      <li data-l10n-id="rights-webservices-term-3"></li>
-      <li data-l10n-id="rights-webservices-term-4"></li>
-      <li data-l10n-id="rights-webservices-term-5"></li>
-      <li data-l10n-id="rights-webservices-term-6"></li>
-      <li data-l10n-id="rights-webservices-term-7"></li>
-    </ol>
-  </div>
-</div>
-
-<script type="application/javascript"><![CDATA[
-  var servicesDiv = document.getElementById("webservices-container");
-  servicesDiv.style.display = "none";
-
-  function showServices() {
-    servicesDiv.style.display = "";
-  }
-
-  var disablingServicesDiv = document.getElementById("disabling-webservices-container");
-  disablingServicesDiv.style.display = "none";
-
-  function showDisablingServices() {
-    disablingServicesDiv.style.display = "";
-  }
-]]></script>
-
-</body>
-</html>
diff --git a/mobile/android/chrome/content/blockedSite.xhtml b/mobile/android/chrome/content/blockedSite.xhtml
deleted file mode 100644
index f54f2ffafaf5..000000000000
--- a/mobile/android/chrome/content/blockedSite.xhtml
+++ /dev/null
@@ -1,211 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!DOCTYPE html [
-  <!ENTITY % htmlDTD PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
-  %htmlDTD;
-  <!ENTITY % globalDTD SYSTEM "chrome://global/locale/global.dtd">
-  %globalDTD;
-  <!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd" >
-  %brandDTD;
-  <!ENTITY % blockedSiteDTD SYSTEM "chrome://browser/locale/phishing.dtd">
-  %blockedSiteDTD;
-]>
-
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-
-<html xmlns="http://www.w3.org/1999/xhtml">
-  <head>
-    <meta name="viewport" content="width=device-width; user-scalable=false" />
-    <link rel="stylesheet" href="chrome://browser/skin/netError.css" media="all" />
-    <link rel="icon" type="image/png" id="favicon" sizes="64x64" href="chrome://browser/skin/images/blocked-warning.png"/>
-
-    <script type="application/javascript"><![CDATA[
-      // Error url MUST be formatted like this:
-      //   about:blocked?e=error_code&u=url(&o=1)?
-      //     (o=1 when user overrides are allowed)
-
-      // Note that this file uses document.documentURI to get
-      // the URL (with the format from above). This is because
-      // document.location.href gets the current URI off the docshell,
-      // which is the URL displayed in the location bar, i.e.
-      // the URI that the user attempted to load.
-
-      function getErrorCode() {
-        var url = document.documentURI;
-        var error = url.search(/e\=/);
-        var duffUrl = url.search(/\&u\=/);
-        return decodeURIComponent(url.slice(error + 2, duffUrl));
-      }
-
-      function getURL() {
-        var url = document.documentURI;
-        var match = url.match(/&u=([^&]+)&/);
-
-        // match == null if not found; if so, return an empty string
-        // instead of what would turn out to be portions of the URI
-        if (!match)
-          return "";
-
-        url = decodeURIComponent(match[1]);
-
-        // If this is a view-source page, then get then real URI of the page
-        if (/^view-source\:/.test(url))
-          url = url.slice(12);
-        return url;
-      }
-
-      /**
-       * Check whether this warning page should be overridable or whether
-       * the "ignore warning" button should be hidden.
-       */
-      function getOverride() {
-        var url = document.documentURI;
-        var match = url.match(/&o=1&/);
-        return !!match;
-      }
-
-      /**
-       * Attempt to get the hostname via document.location.  Fail back
-       * to getURL so that we always return something meaningful.
-       */
-      function getHostString() {
-        try {
-          return document.location.hostname;
-        } catch (e) {
-          return getURL();
-        }
-      }
-
-      function initPage() {
-        var error = "";
-        switch (getErrorCode()) {
-          case "malwareBlocked" :
-            error = "malware";
-            break;
-          case "deceptiveBlocked" :
-            error = "phishing";
-            break;
-          case "unwantedBlocked" :
-            error = "unwanted";
-            break;
-          case "harmfulBlocked" :
-            error = "harmful";
-            break;
-          default:
-            return;
-        }
-
-        var el;
-
-        if (error !== "malware") {
-          el = document.getElementById("errorTitleText_malware");
-          el.remove();
-          el = document.getElementById("errorShortDescText_malware");
-          el.remove();
-          el = document.getElementById("errorLongDescText_malware");
-          el.remove();
-        }
-
-        if (error !== "phishing") {
-          el = document.getElementById("errorTitleText_phishing");
-          el.remove();
-          el = document.getElementById("errorShortDescText_phishing");
-          el.remove();
-          el = document.getElementById("errorLongDescText_phishing");
-          el.remove();
-        }
-
-        if (error !== "unwanted") {
-          el = document.getElementById("errorTitleText_unwanted");
-          el.remove();
-          el = document.getElementById("errorShortDescText_unwanted");
-          el.remove();
-          el = document.getElementById("errorLongDescText_unwanted");
-          el.remove();
-        }
-
-        if (error !== "harmful") {
-          el = document.getElementById("errorTitleText_harmful");
-          el.remove();
-          el = document.getElementById("errorShortDescText_harmful");
-          el.remove();
-        }
-
-        if (!getOverride()) {
-          var btn = document.getElementById("ignoreWarningButton");
-          if (btn) {
-            btn.remove();
-          }
-        }
-
-        // Set sitename
-        let siteElem = document.getElementById(error + "_sitename");
-        if (siteElem) {
-          siteElem.textContent = getHostString();
-        }
-
-        document.title = document.getElementById("errorTitleText_" + error)
-                                 .innerHTML;
-
-        // Inform the test harness that we're done loading the page
-        var event = new CustomEvent("AboutBlockedLoaded", { bubbles: true });
-        document.dispatchEvent(event);
-      }
-    ]]></script>
-  </head>
-
-  <body id="errorPage" class="blockedsite" dir="&locale.dir;">
-
-    <div id="errorPageContainer">
-
-      <!-- Error Title -->
-      <div id="errorTitle">
-        <h1 id="errorTitleText_phishing" class="errorTitleText">&safeb.blocked.phishingPage.title3;</h1>
-        <h1 id="errorTitleText_malware" class="errorTitleText">&safeb.blocked.malwarePage.title;</h1>
-        <h1 id="errorTitleText_unwanted" class="errorTitleText">&safeb.blocked.unwantedPage.title;</h1>
-        <h1 id="errorTitleText_harmful" class="errorTitleText">&safeb.blocked.harmfulPage.title;</h1>
-      </div>
-
-      <div id="errorLongContent">
-
-        <!-- Short Description -->
-        <div id="errorShortDesc">
-          <p id="errorShortDescText_phishing">&safeb.blocked.phishingPage.shortDesc3;</p>
-          <p id="errorShortDescText_malware">&safeb.blocked.malwarePage.shortDesc;</p>
-          <p id="errorShortDescText_unwanted">&safeb.blocked.unwantedPage.shortDesc;</p>
-          <p id="errorShortDescText_harmful">&safeb.blocked.harmfulPage.shortDesc;</p>
-        </div>
-
-        <!-- Long Description -->
-        <div id="errorLongDesc">
-          <p id="errorLongDescText_phishing">&safeb.blocked.phishingPage.longDesc3;</p>
-          <p id="errorLongDescText_malware">&safeb.blocked.malwarePage.longDesc;</p>
-          <p id="errorLongDescText_unwanted">&safeb.blocked.unwantedPage.longDesc;</p>
-        </div>
-
-        <!-- Advisory -->
-        <div id="advisoryDesc">
-          <p id="advisoryDescText">&safeb.palm.advisory.desc;</p>
-        </div>
-
-        <!-- Action buttons -->
-        <div id="buttons">
-          <!-- Commands handled in browser.js -->
-          <button id="getMeOutButton">&safeb.palm.accept.label;</button>
-          <button id="reportButton">&safeb.palm.reportPage.label;</button>
-        </div>
-      </div>
-      <div id="ignoreWarning">
-        <button id="ignoreWarningButton">&safeb.palm.decline.label;</button>
-      </div>
-    </div>
-    <!--
-    - Note: It is important to run the script this way, instead of using
-    - an onload handler. This is because error pages are loaded as
-    - LOAD_BACKGROUND, which means that onload handlers will not be executed.
-    -->
-    <script type="application/javascript">initPage();</script>
-  </body>
-</html>
diff --git a/mobile/android/chrome/content/browser.css b/mobile/android/chrome/content/browser.css
deleted file mode 100644
index b7e0a1d5ef11..000000000000
--- a/mobile/android/chrome/content/browser.css
+++ /dev/null
@@ -1,4 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
diff --git a/mobile/android/chrome/content/browser.js b/mobile/android/chrome/content/browser.js
deleted file mode 100644
index 87e21901afc5..000000000000
--- a/mobile/android/chrome/content/browser.js
+++ /dev/null
@@ -1,8150 +0,0 @@
-// -*- Mode: js2; tab-width: 2; indent-tabs-mode: nil; js2-basic-offset: 2; js2-skip-preprocessor-directives: t; -*-
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-"use strict";
-
-var { AddonManager } = ChromeUtils.import(
-  "resource://gre/modules/AddonManager.jsm"
-);
-var { AppConstants } = ChromeUtils.import(
-  "resource://gre/modules/AppConstants.jsm"
-);
-var { DelayedInit } = ChromeUtils.import(
-  "resource://gre/modules/DelayedInit.jsm"
-);
-var { EventDispatcher } = ChromeUtils.import(
-  "resource://gre/modules/Messaging.jsm"
-);
-var { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
-var { XPCOMUtils } = ChromeUtils.import(
-  "resource://gre/modules/XPCOMUtils.jsm"
-);
-var { TelemetryController } = ChromeUtils.import(
-  "resource://gre/modules/TelemetryController.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "AsyncPrefs",
-  "resource://gre/modules/AsyncPrefs.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Manifests",
-  "resource://gre/modules/Manifest.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "FileUtils",
-  "resource://gre/modules/FileUtils.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "UITelemetry",
-  "resource://gre/modules/UITelemetry.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "PluralForm",
-  "resource://gre/modules/PluralForm.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Downloads",
-  "resource://gre/modules/Downloads.jsm"
-);
-
-ChromeUtils.defineModuleGetter(this, "OS", "resource://gre/modules/osfile.jsm");
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "SafeBrowsing",
-  "resource://gre/modules/SafeBrowsing.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "BrowserUtils",
-  "resource://gre/modules/BrowserUtils.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "PrivateBrowsingUtils",
-  "resource://gre/modules/PrivateBrowsingUtils.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Sanitizer",
-  "resource://gre/modules/Sanitizer.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Prompt",
-  "resource://gre/modules/Prompt.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "HelperApps",
-  "resource://gre/modules/HelperApps.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "FormHistory",
-  "resource://gre/modules/FormHistory.jsm"
-);
-
-XPCOMUtils.defineLazyServiceGetter(
-  this,
-  "uuidgen",
-  "@mozilla.org/uuid-generator;1",
-  "nsIUUIDGenerator"
-);
-
-XPCOMUtils.defineLazyGetter(this, "DEFAULT_UA", function() {
-  return Cc["@mozilla.org/network/protocol;1?name=http"].getService(
-    Ci.nsIHttpProtocolHandler
-  ).userAgent;
-});
-
-XPCOMUtils.defineLazyGetter(this, "DESKTOP_UA", function() {
-  return DEFAULT_UA.replace(
-    /Android \d.+?; [a-zA-Z]+/,
-    "X11; Linux x86_64"
-  ).replace(/Gecko\/[0-9\.]+/, "Gecko/20100101");
-});
-
-if (AppConstants.MOZ_ENABLE_PROFILER_SPS) {
-  XPCOMUtils.defineLazyServiceGetter(
-    this,
-    "Profiler",
-    "@mozilla.org/tools/profiler;1",
-    "nsIProfiler"
-  );
-}
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "SimpleServiceDiscovery",
-  "resource://gre/modules/SimpleServiceDiscovery.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "CharsetMenu",
-  "resource://gre/modules/CharsetMenu.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "NetErrorHelper",
-  "resource://gre/modules/NetErrorHelper.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "PermissionsUtils",
-  "resource://gre/modules/PermissionsUtils.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Preferences",
-  "resource://gre/modules/Preferences.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "SharedPreferences",
-  "resource://gre/modules/SharedPreferences.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Notifications",
-  "resource://gre/modules/Notifications.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "ReaderMode",
-  "resource://gre/modules/ReaderMode.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Snackbars",
-  "resource://gre/modules/Snackbars.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "RuntimePermissions",
-  "resource://gre/modules/RuntimePermissions.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "WebsiteMetadata",
-  "resource://gre/modules/WebsiteMetadata.jsm"
-);
-
-XPCOMUtils.defineLazyServiceGetter(
-  this,
-  "FontEnumerator",
-  "@mozilla.org/gfx/fontenumerator;1",
-  "nsIFontEnumerator"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "E10SUtils",
-  "resource://gre/modules/E10SUtils.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "FormLikeFactory",
-  "resource://gre/modules/FormLikeFactory.jsm"
-);
-ChromeUtils.defineModuleGetter(
-  this,
-  "GeckoViewAutofill",
-  "resource://gre/modules/GeckoViewAutofill.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "ContentBlockingAllowList",
-  "resource://gre/modules/ContentBlockingAllowList.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "GMPInstallManager",
-  "resource://gre/modules/GMPInstallManager.jsm"
-);
-
-var GlobalEventDispatcher = EventDispatcher.instance;
-var WindowEventDispatcher = EventDispatcher.for(window);
-
-var lazilyLoadedBrowserScripts = [
-  ["MasterPassword", "chrome://browser/content/MasterPassword.js"],
-  ["OfflineApps", "chrome://browser/content/OfflineApps.js"],
-  ["Linkifier", "chrome://browser/content/Linkify.js"],
-  ["CastingApps", "chrome://browser/content/CastingApps.js"],
-  ["RemoteDebugger", "chrome://browser/content/RemoteDebugger.js"],
-  ["gViewSourceUtils", "chrome://global/content/viewSourceUtils.js"],
-];
-
-lazilyLoadedBrowserScripts.forEach(function(aScript) {
-  let [name, script] = aScript;
-  XPCOMUtils.defineLazyGetter(window, name, function() {
-    let sandbox = {};
-    Services.scriptloader.loadSubScript(script, sandbox);
-    return sandbox[name];
-  });
-});
-
-var lazilyLoadedObserverScripts = [
-  [
-    "MemoryObserver",
-    ["memory-pressure", "memory-pressure-stop", "Memory:Dump"],
-    "chrome://browser/content/MemoryObserver.js",
-  ],
-  [
-    "ConsoleAPI",
-    ["console-api-log-event"],
-    "chrome://browser/content/ConsoleAPI.js",
-  ],
-  [
-    "ExtensionPermissions",
-    [
-      "webextension-permission-prompt",
-      "webextension-update-permissions",
-      "webextension-optional-permission-prompt",
-    ],
-    "chrome://browser/content/ExtensionPermissions.js",
-  ],
-];
-
-lazilyLoadedObserverScripts.forEach(function(aScript) {
-  let [name, notifications, script] = aScript;
-  XPCOMUtils.defineLazyGetter(window, name, function() {
-    let sandbox = {};
-    Services.scriptloader.loadSubScript(script, sandbox);
-    return sandbox[name];
-  });
-  let observer = (s, t, d) => {
-    Services.obs.removeObserver(observer, t);
-    Services.obs.addObserver(window[name], t);
-    window[name].observe(s, t, d); // Explicitly notify new observer
-  };
-  notifications.forEach(notification => {
-    Services.obs.addObserver(observer, notification);
-  });
-});
-
-// Lazily-loaded browser scripts that use message listeners.
-[
-  [
-    "Reader",
-    [
-      ["Reader:AddToCache", false],
-      ["Reader:RemoveFromCache", false],
-      ["Reader:ArticleGet", false],
-      ["Reader:DropdownClosed", true], // 'true' allows us to survive mid-air cycle-collection.
-      ["Reader:DropdownOpened", false],
-      ["Reader:FaviconRequest", false],
-      ["Reader:ToolbarHidden", false],
-      ["Reader:SystemUIVisibility", false],
-      ["Reader:UpdateReaderButton", false],
-    ],
-    "chrome://browser/content/Reader.js",
-  ],
-].forEach(aScript => {
-  let [name, messages, script] = aScript;
-  XPCOMUtils.defineLazyGetter(window, name, function() {
-    let sandbox = {};
-    Services.scriptloader.loadSubScript(script, sandbox);
-    return sandbox[name];
-  });
-
-  let mm = window.getGroupMessageManager("browsers");
-  let listener = message => {
-    mm.removeMessageListener(message.name, listener);
-    let listenAfterClose = false;
-    for (let [name, laClose] of messages) {
-      if (message.name === name) {
-        listenAfterClose = laClose;
-        break;
-      }
-    }
-
-    mm.addMessageListener(message.name, window[name], listenAfterClose);
-    window[name].receiveMessage(message);
-  };
-
-  messages.forEach(message => {
-    let [name, listenAfterClose] = message;
-    mm.addMessageListener(name, listener, listenAfterClose);
-  });
-});
-
-// Lazily-loaded JS subscripts and modules that use global/window EventDispatcher.
-[
-  [
-    "EmbedRT",
-    WindowEventDispatcher,
-    ["GeckoView:ImportScript"],
-    "chrome://browser/content/EmbedRT.js",
-  ],
-  [
-    "Feedback",
-    GlobalEventDispatcher,
-    ["Feedback:Show"],
-    "chrome://browser/content/Feedback.js",
-  ],
-  [
-    "FeedHandler",
-    GlobalEventDispatcher,
-    ["Feeds:Subscribe"],
-    "chrome://browser/content/FeedHandler.js",
-  ],
-  [
-    "FindHelper",
-    GlobalEventDispatcher,
-    ["FindInPage:Opened", "FindInPage:Closed"],
-    "chrome://browser/content/FindHelper.js",
-  ],
-  [
-    "Home",
-    GlobalEventDispatcher,
-    [
-      "HomeBanner:Get",
-      "HomePanels:Get",
-      "HomePanels:Authenticate",
-      "HomePanels:RefreshView",
-      "HomePanels:Installed",
-      "HomePanels:Uninstalled",
-    ],
-    "resource://gre/modules/Home.jsm",
-  ],
-  [
-    "PermissionsHelper",
-    GlobalEventDispatcher,
-    ["Permissions:Check", "Permissions:Get", "Permissions:Clear"],
-    "chrome://browser/content/PermissionsHelper.js",
-  ],
-  [
-    "PrintHelper",
-    GlobalEventDispatcher,
-    ["Print:PDF"],
-    "chrome://browser/content/PrintHelper.js",
-  ],
-  [
-    "Reader",
-    GlobalEventDispatcher,
-    ["Reader:AddToCache", "Reader:RemoveFromCache"],
-    "chrome://browser/content/Reader.js",
-  ],
-].forEach(module => {
-  let [name, dispatcher, events, script] = module;
-  XPCOMUtils.defineLazyGetter(window, name, function() {
-    let sandbox = {};
-    if (script.endsWith(".jsm")) {
-      ChromeUtils.import(script, sandbox);
-    } else {
-      Services.scriptloader.loadSubScript(script, sandbox);
-    }
-    return sandbox[name];
-  });
-  let listener = (event, message, callback) => {
-    dispatcher.unregisterListener(listener, event);
-    dispatcher.registerListener(window[name], event);
-    window[name].onEvent(event, message, callback); // Explicitly notify new listener
-  };
-  dispatcher.registerListener(listener, events);
-});
-
-XPCOMUtils.defineLazyServiceGetter(
-  this,
-  "Haptic",
-  "@mozilla.org/widget/hapticfeedback;1",
-  "nsIHapticFeedback"
-);
-
-XPCOMUtils.defineLazyServiceGetter(
-  this,
-  "ParentalControls",
-  "@mozilla.org/parental-controls-service;1",
-  "nsIParentalControlsService"
-);
-
-XPCOMUtils.defineLazyModuleGetter(
-  this,
-  "Log",
-  "resource://gre/modules/AndroidLog.jsm",
-  "AndroidLog"
-);
-
-// Define the "dump" function as a binding of the Log.d function so it specifies
-// the "debug" priority and a log tag.
-function dump(msg) {
-  Log.d("Browser", msg);
-}
-
-const kStateActive = 0x00000001; // :active pseudoclass for elements
-
-const kXLinkNamespace = "http://www.w3.org/1999/xlink";
-
-function fuzzyEquals(a, b) {
-  return Math.abs(a - b) < 1e-6;
-}
-
-XPCOMUtils.defineLazyGetter(this, "ContentAreaUtils", function() {
-  let ContentAreaUtils = {};
-  Services.scriptloader.loadSubScript(
-    "chrome://global/content/contentAreaUtils.js",
-    ContentAreaUtils
-  );
-  return ContentAreaUtils;
-});
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Rect",
-  "resource://gre/modules/Geometry.jsm"
-);
-ChromeUtils.defineModuleGetter(
-  this,
-  "Point",
-  "resource://gre/modules/Geometry.jsm"
-);
-
-function resolveGeckoURI(aURI) {
-  if (!aURI) {
-    throw new Error("Can't resolve an empty uri");
-  }
-
-  if (aURI.startsWith("chrome://")) {
-    let registry = Cc["@mozilla.org/chrome/chrome-registry;1"].getService(
-      Ci.nsIChromeRegistry
-    );
-    return registry.convertChromeURL(Services.io.newURI(aURI)).spec;
-  } else if (aURI.startsWith("resource://")) {
-    let handler = Services.io
-      .getProtocolHandler("resource")
-      .QueryInterface(Ci.nsIResProtocolHandler);
-    return handler.resolveURI(Services.io.newURI(aURI));
-  }
-  return aURI;
-}
-
-XPCOMUtils.defineLazyGetter(this, "ReferrerInfo", () =>
-  Components.Constructor(
-    "@mozilla.org/referrer-info;1",
-    "nsIReferrerInfo",
-    "init"
-  )
-);
-
-function createReferrerInfo(aReferrer) {
-  let referrerUri;
-  try {
-    referrerUri = Services.io.newURI(aReferrer);
-  } catch (ignored) {}
-
-  return new ReferrerInfo(Ci.nsIReferrerInfo.EMPTY, true, referrerUri);
-}
-
-/**
- * Cache of commonly used string bundles.
- */
-var Strings = {
-  init: function() {
-    XPCOMUtils.defineLazyGetter(Strings, "brand", () =>
-      Services.strings.createBundle("chrome://branding/locale/brand.properties")
-    );
-    XPCOMUtils.defineLazyGetter(Strings, "browser", () =>
-      Services.strings.createBundle(
-        "chrome://browser/locale/browser.properties"
-      )
-    );
-    XPCOMUtils.defineLazyGetter(Strings, "reader", () =>
-      Services.strings.createBundle(
-        "chrome://global/locale/aboutReader.properties"
-      )
-    );
-  },
-
-  flush: function() {
-    Services.strings.flushBundles();
-    this.init();
-  },
-};
-
-Strings.init();
-
-const kFormHelperModeDisabled = 0;
-const kFormHelperModeEnabled = 1;
-const kFormHelperModeDynamic = 2; // disabled on tablets
-const kMaxHistoryListSize = 50;
-
-function InitLater(fn, object, name) {
-  return DelayedInit.schedule(fn, object, name, 15000 /* 15s max wait */);
-}
-
-var BrowserApp = {
-  _tabs: [],
-  _selectedTab: null,
-
-  get isTablet() {
-    let sysInfo = Cc["@mozilla.org/system-info;1"].getService(
-      Ci.nsIPropertyBag2
-    );
-    delete this.isTablet;
-    return (this.isTablet = sysInfo.get("tablet"));
-  },
-
-  get isOnLowMemoryPlatform() {
-    let memory = Cc["@mozilla.org/xpcom/memory-service;1"].getService(
-      Ci.nsIMemory
-    );
-    delete this.isOnLowMemoryPlatform;
-    return (this.isOnLowMemoryPlatform = memory.isLowMemoryPlatform());
-  },
-
-  // Note that the deck list order does not necessarily reflect the user visible tab order (see
-  // bug 1331154 for the reason), so deck.selectedIndex should not be used (though
-  // deck.selectedPanel is still valid) - use selectedTabIndex instead.
-  deck: null,
-
-  startup: function startup() {
-    window.browserDOMWindow = new nsBrowserAccess();
-    Services.obs.notifyObservers(this.browser, "BrowserChrome:Ready");
-
-    this.deck = document.getElementById("browsers");
-
-    BrowserEventHandler.init();
-
-    Services.androidBridge.browserApp = this;
-
-    WindowEventDispatcher.registerListener(this, [
-      "GeckoView:ZoomToInput",
-      "Session:Restore",
-      "Tab:Load",
-      "Tab:Selected",
-      "Tab:Closed",
-      "Tab:Move",
-      "Tab:OpenUri",
-      "Tab:ViewSource",
-    ]);
-
-    GlobalEventDispatcher.registerListener(this, [
-      "Browser:LoadManifest",
-      "Browser:Quit",
-      "DesktopMode:Change",
-      "Fonts:Reload",
-      "FormHistory:Init",
-      "FullScreen:Exit",
-      "Locale:OS",
-      "Locale:Changed",
-      "Passwords:Init",
-      "Sanitize:ClearData",
-      "SaveAs:PDF",
-      "Session:Back",
-      "Session:Forward",
-      "Session:GetHistory",
-      "Session:Navigate",
-      "Session:Reload",
-      "Session:Stop",
-      "Telemetry:CustomTabsPing",
-    ]);
-
-    // Provide compatibility for add-ons like QuitNow that send "Browser:Quit"
-    // as an observer notification.
-    Services.obs.addObserver(
-      (subject, topic, data) => this.quit(data ? JSON.parse(data) : undefined),
-      "Browser:Quit"
-    );
-
-    Services.obs.addObserver(this, "android-get-pref");
-    Services.obs.addObserver(this, "android-set-pref");
-    Services.obs.addObserver(this, "gather-telemetry");
-    Services.obs.addObserver(this, "keyword-search");
-    Services.obs.addObserver(this, "Vibration:Request");
-
-    window.addEventListener("fullscreen", function() {
-      WindowEventDispatcher.sendRequest({
-        type: window.fullScreen ? "ToggleChrome:Hide" : "ToggleChrome:Show",
-      });
-    });
-
-    window.addEventListener("fullscreenchange", e => {
-      WindowEventDispatcher.sendRequest({
-        type: document.fullscreenElement
-          ? "DOMFullScreen:Start"
-          : "DOMFullScreen:Stop",
-      });
-
-      if (this.fullscreenTransitionTab) {
-        // Tab selection has changed during a fullscreen transition, handle it now.
-        let tab = this.fullscreenTransitionTab;
-        this.fullscreenTransitionTab = null;
-        this.selectTab(tab);
-      }
-    });
-
-    NativeWindow.init();
-    IndexedDB.init();
-    XPInstallObserver.init();
-    CharacterEncoding.init();
-    ActivityObserver.init();
-    RemoteDebugger.init(window);
-    Distribution.init();
-    Tabs.init();
-    SearchEngines.init();
-    Experiments.init();
-
-    // XXX maybe we don't do this if the launch was kicked off from external
-    Services.io.offline = false;
-
-    // Broadcast a UIReady message so add-ons know we are finished with startup
-    let event = document.createEvent("Events");
-    event.initEvent("UIReady", true, false);
-    window.dispatchEvent(event);
-
-    if (this._startupStatus) {
-      this.onAppUpdated();
-    }
-
-    if (!ParentalControls.isAllowed(ParentalControls.INSTALL_EXTENSION)) {
-      // Disable extension installs
-      Services.prefs.setIntPref("extensions.enabledScopes", 5);
-      Services.prefs.setIntPref("extensions.autoDisableScopes", 1);
-      Services.prefs.setBoolPref("xpinstall.enabled", false);
-    } else if (ParentalControls.parentalControlsEnabled) {
-      Services.prefs.clearUserPref("extensions.enabledScopes");
-      Services.prefs.clearUserPref("extensions.autoDisableScopes");
-      Services.prefs.setBoolPref("xpinstall.enabled", true);
-    }
-
-    this.hideH264AddonIfNeeded();
-
-    if (ParentalControls.parentalControlsEnabled) {
-      let isBlockListEnabled = ParentalControls.isAllowed(
-        ParentalControls.BLOCK_LIST
-      );
-      Services.prefs.setBoolPref(
-        "browser.safebrowsing.allowOverride",
-        !isBlockListEnabled
-      );
-
-      let isTelemetryEnabled = ParentalControls.isAllowed(
-        ParentalControls.TELEMETRY
-      );
-      Services.prefs.setBoolPref(
-        "toolkit.telemetry.enabled",
-        isTelemetryEnabled
-      );
-
-      let isHealthReportEnabled = ParentalControls.isAllowed(
-        ParentalControls.HEALTH_REPORT
-      );
-      SharedPreferences.forApp().setBoolPref(
-        "android.not_a_preference.healthreport.uploadEnabled",
-        isHealthReportEnabled
-      );
-    }
-
-    InitLater(
-      () => {
-        // The order that context menu items are added is important
-        // Make sure the "Open in App" context menu item appears at the bottom of the list
-        this.initContextMenu();
-        ExternalApps.init();
-      },
-      NativeWindow,
-      "contextmenus"
-    );
-
-    InitLater(() => {
-      (async () => {
-        let downloadsDir = await Downloads.getPreferredDownloadsDirectory();
-        let logsDir = OS.Path.join(downloadsDir, "memory-reports");
-        await OS.File.removeDir(logsDir);
-      })();
-    });
-
-    // Don't delay loading content.js because when we restore reader mode tabs,
-    // we require the reader mode scripts in content.js right away.
-    let mm = window.getGroupMessageManager("browsers");
-    mm.loadFrameScript("chrome://browser/content/content.js", true, true);
-
-    // Listen to manifest messages
-    mm.loadFrameScript(
-      "chrome://global/content/manifestMessages.js",
-      true,
-      true
-    );
-
-    // We can't delay registering WebChannel listeners: if the first page is
-    // about:accounts, which can happen when starting the Firefox Account flow
-    // from the first run experience, or via the Firefox Account Status
-    // Activity, we can and do miss messages from the fxa-content-server.
-    // However, we never allow suitably restricted profiles from listening to
-    // fxa-content-server messages.
-    if (ParentalControls.isAllowed(ParentalControls.MODIFY_ACCOUNTS)) {
-      var { EnsureFxAccountsWebChannel } = ChromeUtils.import(
-        "resource://gre/modules/FxAccountsWebChannel.jsm"
-      );
-      EnsureFxAccountsWebChannel();
-    } else {
-      console.log(
-        "browser.js: not loading Firefox Accounts WebChannel; this profile cannot connect to Firefox Accounts."
-      );
-    }
-
-    // Notify Java that Gecko has loaded.
-    GlobalEventDispatcher.sendRequest({ type: "Gecko:Ready" });
-
-    this.deck.addEventListener(
-      "DOMContentLoaded",
-      function() {
-        ChromeUtils.import("resource://gre/modules/NotificationDB.jsm");
-
-        InitLater(() =>
-          Services.obs.notifyObservers(
-            window,
-            "browser-delayed-startup-finished"
-          )
-        );
-        InitLater(() =>
-          GlobalEventDispatcher.sendRequest({ type: "Gecko:DelayedStartup" })
-        );
-
-        // AsyncPrefs is needed for reader mode.
-        InitLater(() => AsyncPrefs.init());
-
-        // Collect telemetry data.
-        // We do this at startup because we want to move away from "gather-telemetry" (bug 1127907)
-        InitLater(() => {
-          Telemetry.addData(
-            "FENNEC_TRACKING_PROTECTION_STATE",
-            parseInt(BrowserApp.getTrackingProtectionState())
-          );
-        });
-
-        InitLater(() => LightWeightThemeStuff.init());
-        InitLater(() => CastingApps.init(), window, "CastingApps");
-
-        // Bug 778855 - Perf regression if we do this here. To be addressed in bug 779008.
-        InitLater(() => SafeBrowsing.init(), window, "SafeBrowsing");
-
-        // Start Marionette after all startup scripts have been run.
-        InitLater(() => {
-          Services.obs.notifyObservers(window, "marionette-startup-requested");
-        });
-
-        // This should always go last, since the idle tasks (except for the ones with
-        // timeouts) should execute in order. Note that this observer notification is
-        // not guaranteed to fire, since the window could close before we get here.
-        InitLater(() => {
-          Services.obs.notifyObservers(
-            window,
-            "browser-idle-startup-tasks-finished"
-          );
-        });
-      },
-      { once: true }
-    );
-  },
-
-  get _startupStatus() {
-    delete this._startupStatus;
-
-    let savedMilestone = Services.prefs.getCharPref(
-      "browser.startup.homepage_override.mstone",
-      ""
-    );
-    let ourMilestone = AppConstants.MOZ_APP_VERSION;
-    this._startupStatus = "";
-    if (ourMilestone != savedMilestone) {
-      Services.prefs.setCharPref(
-        "browser.startup.homepage_override.mstone",
-        ourMilestone
-      );
-      this._startupStatus = savedMilestone ? "upgrade" : "new";
-    }
-
-    return this._startupStatus;
-  },
-
-  /**
-   * Pass this a locale string, such as "fr" or "es_ES".
-   */
-  setLocale: function(locale) {
-    WindowEventDispatcher.sendRequest({ type: "Locale:Set", locale: locale });
-  },
-
-  hideH264AddonIfNeeded: function() {
-    let installManager = new GMPInstallManager();
-    installManager.checkForAddons().then(
-      ({ usedFallback, gmpAddons }) => {
-        gmpAddons.forEach(addon => {
-          if (addon && addon.id === "gmp-gmpopenh264" && !addon.isInstalled) {
-            Services.prefs.setBoolPref("media.gmp-gmpopenh264.visible", false);
-            Services.prefs.setBoolPref("media.gmp-gmpopenh264.enabled", false);
-          }
-        });
-      },
-      err => {
-        console.log(`Checking for addons failed with:${err}`);
-      }
-    );
-  },
-
-  initContextMenu: function() {
-    // We pass a thunk in place of a raw label string. This allows the
-    // context menu to automatically accommodate locale changes without
-    // having to be rebuilt.
-    let stringGetter = name => () => Strings.browser.GetStringFromName(name);
-
-    function videoClassifier(aTarget) {
-      if (aTarget.readyState == aTarget.HAVE_NOTHING) {
-        // We don't know if the height/width of the video,
-        // show a generic string.
-        return "Media";
-      } else if (aTarget.videoWidth == 0 || aTarget.videoHeight == 0) {
-        // If a video element is zero width or height, it's essentially
-        // an HTMLAudioElement.
-        return "Audio";
-      }
-      return "Video";
-    }
-
-    // TODO: These should eventually move into more appropriate classes
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.openInNewTab"),
-      NativeWindow.contextmenus.linkOpenableNonPrivateContext,
-      function(aTarget) {
-        UITelemetry.addEvent(
-          "action.1",
-          "contextmenu",
-          null,
-          "web_open_new_tab"
-        );
-        UITelemetry.addEvent("loadurl.1", "contextmenu", null);
-
-        let url = NativeWindow.contextmenus._getLinkURL(aTarget);
-        ContentAreaUtils.urlSecurityCheck(
-          url,
-          aTarget.ownerDocument.nodePrincipal
-        );
-        let tab = BrowserApp.addTab(url, {
-          selected: false,
-          parentId: BrowserApp.selectedTab.id,
-        });
-
-        let newtabStrings = Strings.browser.GetStringFromName(
-          "newtabpopup.opened"
-        );
-        let label = PluralForm.get(1, newtabStrings).replace("#1", 1);
-        let buttonLabel = Strings.browser.GetStringFromName(
-          "newtabpopup.switch"
-        );
-
-        Snackbars.show(label, Snackbars.LENGTH_LONG, {
-          action: {
-            label: buttonLabel,
-            callback: () => {
-              BrowserApp.selectTab(tab);
-            },
-          },
-        });
-      }
-    );
-
-    let showOpenInPrivateTab = true;
-    if ("@mozilla.org/parental-controls-service;1" in Cc) {
-      let pc = Cc["@mozilla.org/parental-controls-service;1"].createInstance(
-        Ci.nsIParentalControlsService
-      );
-      showOpenInPrivateTab = pc.isAllowed(
-        Ci.nsIParentalControlsService.PRIVATE_BROWSING
-      );
-    }
-
-    if (showOpenInPrivateTab) {
-      NativeWindow.contextmenus.add(
-        stringGetter("contextmenu.openInPrivateTab"),
-        NativeWindow.contextmenus.linkOpenableContext,
-        function(aTarget) {
-          UITelemetry.addEvent(
-            "action.1",
-            "contextmenu",
-            null,
-            "web_open_new_tab"
-          );
-          UITelemetry.addEvent("loadurl.1", "contextmenu", null);
-
-          let url = NativeWindow.contextmenus._getLinkURL(aTarget);
-          ContentAreaUtils.urlSecurityCheck(
-            url,
-            aTarget.ownerDocument.nodePrincipal
-          );
-          let tab = BrowserApp.addTab(url, {
-            selected: false,
-            parentId: BrowserApp.selectedTab.id,
-            isPrivate: true,
-          });
-
-          let newtabStrings = Strings.browser.GetStringFromName(
-            "newprivatetabpopup.opened"
-          );
-          let label = PluralForm.get(1, newtabStrings).replace("#1", 1);
-          let buttonLabel = Strings.browser.GetStringFromName(
-            "newtabpopup.switch"
-          );
-          Snackbars.show(label, Snackbars.LENGTH_LONG, {
-            action: {
-              label: buttonLabel,
-              callback: () => {
-                BrowserApp.selectTab(tab);
-              },
-            },
-          });
-        }
-      );
-    }
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.copyLink"),
-      NativeWindow.contextmenus.linkCopyableContext,
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_copy_link");
-
-        let url = NativeWindow.contextmenus._getLinkURL(aTarget);
-        url = NativeWindow.contextmenus._stripViewSource(url);
-        NativeWindow.contextmenus._copyStringToDefaultClipboard(url);
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.copyEmailAddress"),
-      NativeWindow.contextmenus.emailLinkContext,
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_copy_email");
-
-        let url = NativeWindow.contextmenus._getLinkURL(aTarget);
-        let emailAddr = NativeWindow.contextmenus._stripScheme(url);
-        NativeWindow.contextmenus._copyStringToDefaultClipboard(emailAddr);
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.copyPhoneNumber"),
-      NativeWindow.contextmenus.phoneNumberLinkContext,
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_copy_phone");
-
-        let url = NativeWindow.contextmenus._getLinkURL(aTarget);
-        let phoneNumber = NativeWindow.contextmenus._stripScheme(url);
-        NativeWindow.contextmenus._copyStringToDefaultClipboard(phoneNumber);
-      }
-    );
-
-    NativeWindow.contextmenus.add({
-      label: stringGetter("contextmenu.shareLink"),
-      order: NativeWindow.contextmenus.DEFAULT_HTML5_ORDER - 1, // Show above HTML5 menu items
-      selector: NativeWindow.contextmenus._disableRestricted(
-        "SHARE",
-        NativeWindow.contextmenus.linkShareableContext
-      ),
-      showAsActions: function(aElement) {
-        let uri = NativeWindow.contextmenus._getLinkURL(aElement);
-        uri = NativeWindow.contextmenus._stripViewSource(uri);
-        return {
-          title: aElement.textContent.trim() || aElement.title.trim(),
-          uri,
-        };
-      },
-      icon: "drawable://ic_menu_share",
-      callback: function(aTarget) {
-        // share.1 telemetry is handled in Java via PromptList
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_share_link");
-      },
-    });
-
-    NativeWindow.contextmenus.add({
-      label: stringGetter("contextmenu.shareEmailAddress"),
-      order: NativeWindow.contextmenus.DEFAULT_HTML5_ORDER - 1,
-      selector: NativeWindow.contextmenus._disableRestricted(
-        "SHARE",
-        NativeWindow.contextmenus.emailLinkContext
-      ),
-      showAsActions: function(aElement) {
-        let url = NativeWindow.contextmenus._getLinkURL(aElement);
-        let emailAddr = NativeWindow.contextmenus._stripScheme(url);
-        let title = aElement.textContent || aElement.title;
-        return {
-          title: title,
-          uri: emailAddr,
-        };
-      },
-      icon: "drawable://ic_menu_share",
-      callback: function(aTarget) {
-        // share.1 telemetry is handled in Java via PromptList
-        UITelemetry.addEvent(
-          "action.1",
-          "contextmenu",
-          null,
-          "web_share_email"
-        );
-      },
-    });
-
-    NativeWindow.contextmenus.add({
-      label: stringGetter("contextmenu.sharePhoneNumber"),
-      order: NativeWindow.contextmenus.DEFAULT_HTML5_ORDER - 1,
-      selector: NativeWindow.contextmenus._disableRestricted(
-        "SHARE",
-        NativeWindow.contextmenus.phoneNumberLinkContext
-      ),
-      showAsActions: function(aElement) {
-        let url = NativeWindow.contextmenus._getLinkURL(aElement);
-        let phoneNumber = NativeWindow.contextmenus._stripScheme(url);
-        let title = aElement.textContent || aElement.title;
-        return {
-          title: title,
-          uri: phoneNumber,
-        };
-      },
-      icon: "drawable://ic_menu_share",
-      callback: function(aTarget) {
-        // share.1 telemetry is handled in Java via PromptList
-        UITelemetry.addEvent(
-          "action.1",
-          "contextmenu",
-          null,
-          "web_share_phone"
-        );
-      },
-    });
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.addToContacts"),
-      NativeWindow.contextmenus._disableRestricted(
-        "ADD_CONTACT",
-        NativeWindow.contextmenus.emailLinkContext
-      ),
-      function(aTarget) {
-        UITelemetry.addEvent(
-          "action.1",
-          "contextmenu",
-          null,
-          "web_contact_email"
-        );
-
-        let url = NativeWindow.contextmenus._getLinkURL(aTarget);
-        WindowEventDispatcher.sendRequest({
-          type: "Contact:Add",
-          email: url,
-        });
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.addToContacts"),
-      NativeWindow.contextmenus._disableRestricted(
-        "ADD_CONTACT",
-        NativeWindow.contextmenus.phoneNumberLinkContext
-      ),
-      function(aTarget) {
-        UITelemetry.addEvent(
-          "action.1",
-          "contextmenu",
-          null,
-          "web_contact_phone"
-        );
-
-        let url = NativeWindow.contextmenus._getLinkURL(aTarget);
-        WindowEventDispatcher.sendRequest({
-          type: "Contact:Add",
-          phone: url,
-        });
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.bookmarkLink"),
-      NativeWindow.contextmenus._disableRestricted(
-        "BOOKMARK",
-        NativeWindow.contextmenus.linkBookmarkableContext
-      ),
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_bookmark");
-        UITelemetry.addEvent("save.1", "contextmenu", null, "bookmark");
-
-        let url = NativeWindow.contextmenus._getLinkURL(aTarget);
-        let title = aTarget.textContent || aTarget.title || url;
-        GlobalEventDispatcher.sendRequest({
-          type: "Bookmark:Insert",
-          url: url,
-          title: title,
-        });
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.playMedia"),
-      NativeWindow.contextmenus.mediaContext("media-paused"),
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_play");
-        aTarget.play();
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.pauseMedia"),
-      NativeWindow.contextmenus.mediaContext("media-playing"),
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_pause");
-        aTarget.pause();
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.showControls2"),
-      NativeWindow.contextmenus.mediaContext("media-hidingcontrols"),
-      function(aTarget) {
-        UITelemetry.addEvent(
-          "action.1",
-          "contextmenu",
-          null,
-          "web_controls_media"
-        );
-        aTarget.setAttribute("controls", true);
-      }
-    );
-
-    NativeWindow.contextmenus.add({
-      label: function(aTarget) {
-        return Strings.browser.GetStringFromName(
-          `contextmenu.share${videoClassifier(aTarget)}2`
-        );
-      },
-      order: NativeWindow.contextmenus.DEFAULT_HTML5_ORDER - 1,
-      selector: NativeWindow.contextmenus._disableRestricted(
-        "SHARE",
-        NativeWindow.contextmenus.videoContext()
-      ),
-      showAsActions: function(aElement) {
-        let url = aElement.currentSrc || aElement.src;
-        let title = aElement.textContent || aElement.title;
-        return {
-          title: title,
-          uri: url,
-          type: videoClassifier(aElement) === "Audio" ? "audio/*" : "video/*",
-        };
-      },
-      icon: "drawable://ic_menu_share",
-      callback: function(aTarget) {
-        // share.1 telemetry is handled in Java via PromptList
-        UITelemetry.addEvent(
-          "action.1",
-          "contextmenu",
-          null,
-          "web_share_media"
-        );
-      },
-    });
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.fullScreen"),
-      NativeWindow.contextmenus.videoContext("not-fullscreen"),
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_fullscreen");
-        aTarget.requestFullscreen();
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.mute"),
-      NativeWindow.contextmenus.mediaContext("media-unmuted"),
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_mute");
-        aTarget.muted = true;
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.unmute"),
-      NativeWindow.contextmenus.mediaContext("media-muted"),
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_unmute");
-        aTarget.muted = false;
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.viewImage"),
-      NativeWindow.contextmenus.imageLocationCopyableContext,
-      function(aTarget) {
-        let url = aTarget.currentSrc || aTarget.src;
-        ContentAreaUtils.urlSecurityCheck(
-          url,
-          aTarget.ownerDocument.nodePrincipal,
-          Ci.nsIScriptSecurityManager.DISALLOW_SCRIPT
-        );
-
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_view_image");
-        UITelemetry.addEvent("loadurl.1", "contextmenu", null);
-        BrowserApp.selectedBrowser.loadURI(url);
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.copyImageLocation"),
-      NativeWindow.contextmenus.imageLocationCopyableContext,
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_copy_image");
-
-        let url = aTarget.currentSrc || aTarget.src;
-        url = NativeWindow.contextmenus._stripViewSource(url);
-        NativeWindow.contextmenus._copyStringToDefaultClipboard(url);
-      }
-    );
-
-    NativeWindow.contextmenus.add({
-      label: stringGetter("contextmenu.shareImage"),
-      selector: NativeWindow.contextmenus._disableRestricted(
-        "SHARE",
-        NativeWindow.contextmenus.imageShareableContext
-      ),
-      order: NativeWindow.contextmenus.DEFAULT_HTML5_ORDER - 1, // Show above HTML5 menu items
-      showAsActions: function(aTarget) {
-        let src = aTarget.currentSrc || aTarget.src;
-        src = NativeWindow.contextmenus._stripViewSource(src);
-        return {
-          title: src,
-          uri: src,
-          type: "image/*",
-        };
-      },
-      icon: "drawable://ic_menu_share",
-      menu: true,
-      callback: function(aTarget) {
-        UITelemetry.addEvent(
-          "action.1",
-          "contextmenu",
-          null,
-          "web_share_image"
-        );
-      },
-    });
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.saveImage"),
-      NativeWindow.contextmenus.imageSaveableContext,
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_save_image");
-        UITelemetry.addEvent("save.1", "contextmenu", null, "image");
-        WindowEventDispatcher.sendRequest({
-          type: "Mma:web_save_image",
-        });
-
-        RuntimePermissions.waitForPermissions(
-          RuntimePermissions.WRITE_EXTERNAL_STORAGE
-        ).then(function(permissionGranted) {
-          if (!permissionGranted) {
-            return;
-          }
-
-          let referrerInfo = Cc["@mozilla.org/referrer-info;1"].createInstance(
-            Ci.nsIReferrerInfo
-          );
-          referrerInfo.initWithDocument(aTarget.ownerDocument);
-          let uri = aTarget.currentRequestFinalURI || aTarget.currentURI;
-          ContentAreaUtils.saveImageURL(
-            uri.spec,
-            null,
-            "SaveImageTitle",
-            false,
-            true,
-            referrerInfo,
-            aTarget.ownerDocument
-          );
-        });
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.setImageAs"),
-      NativeWindow.contextmenus._disableRestricted(
-        "SET_IMAGE",
-        NativeWindow.contextmenus.imageSaveableContext
-      ),
-      function(aTarget) {
-        UITelemetry.addEvent(
-          "action.1",
-          "contextmenu",
-          null,
-          "web_background_image"
-        );
-
-        let src = aTarget.currentSrc || aTarget.src;
-        GlobalEventDispatcher.sendRequest({
-          type: "Image:SetAs",
-          url: src,
-        });
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      function(aTarget) {
-        if (aTarget instanceof HTMLVideoElement) {
-          return Strings.browser.GetStringFromName(
-            `contextmenu.save${videoClassifier(aTarget)}`
-          );
-        } else if (aTarget instanceof HTMLAudioElement) {
-          return Strings.browser.GetStringFromName("contextmenu.saveAudio");
-        }
-        return Strings.browser.GetStringFromName("contextmenu.saveVideo");
-      },
-      NativeWindow.contextmenus.mediaSaveableContext,
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_save_media");
-        UITelemetry.addEvent("save.1", "contextmenu", null, "media");
-        WindowEventDispatcher.sendRequest({
-          type: "Mma:web_save_media",
-        });
-
-        let url = aTarget.currentSrc || aTarget.src;
-
-        let filePickerTitleKey;
-        if (aTarget instanceof HTMLVideoElement) {
-          filePickerTitleKey = `Save${videoClassifier(aTarget)}Title`;
-        } else {
-          filePickerTitleKey = "SaveAudioTitle";
-        }
-
-        // Skipped trying to pull MIME type out of cache for now
-        let referrerInfo = Cc["@mozilla.org/referrer-info;1"].createInstance(
-          Ci.nsIReferrerInfo
-        );
-        referrerInfo.initWithDocument(aTarget.ownerDocument);
-        ContentAreaUtils.internalSave(
-          url,
-          null,
-          null,
-          null,
-          null,
-          false,
-          filePickerTitleKey,
-          null,
-          referrerInfo,
-          aTarget.ownerDocument,
-          true,
-          null
-        );
-      }
-    );
-
-    NativeWindow.contextmenus.add(
-      stringGetter("contextmenu.showImage"),
-      NativeWindow.contextmenus.imageBlockingPolicyContext,
-      function(aTarget) {
-        UITelemetry.addEvent("action.1", "contextmenu", null, "web_show_image");
-        aTarget.setAttribute("data-ctv-show", "true");
-        aTarget.setAttribute("src", aTarget.getAttribute("data-ctv-src"));
-
-        // Shows a snackbar to unblock all images if browser.image_blocking.enabled is enabled.
-        let blockedImgs = aTarget.ownerDocument.querySelectorAll(
-          "[data-ctv-src]"
-        );
-        if (blockedImgs.length == 0) {
-          return;
-        }
-        let message = Strings.browser.GetStringFromName(
-          "imageblocking.downloadedImage"
-        );
-        Snackbars.show(message, Snackbars.LENGTH_LONG, {
-          action: {
-            label: Strings.browser.GetStringFromName(
-              "imageblocking.showAllImages"
-            ),
-            callback: () => {
-              UITelemetry.addEvent(
-                "action.1",
-                "toast",
-                null,
-                "web_show_all_image"
-              );
-              for (let i = 0; i < blockedImgs.length; ++i) {
-                blockedImgs[i].setAttribute("data-ctv-show", "true");
-                blockedImgs[i].setAttribute(
-                  "src",
-                  blockedImgs[i].getAttribute("data-ctv-src")
-                );
-              }
-            },
-          },
-        });
-      }
-    );
-  },
-
-  onAppUpdated: function() {
-    // initialize the form history and passwords databases on upgrades
-    GlobalEventDispatcher.dispatch("FormHistory:Init", null);
-    GlobalEventDispatcher.dispatch("Passwords:Init", null);
-
-    if (this._startupStatus === "upgrade") {
-      this._migrateUI();
-    }
-  },
-
-  _migrateUI: function() {
-    const UI_VERSION = 4;
-    let currentUIVersion = Services.prefs.getIntPref(
-      "browser.migration.version",
-      0
-    );
-    if (currentUIVersion >= UI_VERSION) {
-      return;
-    }
-
-    if (currentUIVersion < 1) {
-      // Migrate the "privacy.donottrackheader.value" pref. See bug 1042135.
-      if (Services.prefs.prefHasUserValue("privacy.donottrackheader.value")) {
-        // Make sure the doNotTrack value conforms to the conversion from
-        // three-state to two-state. (This reverts a setting of "please track me"
-        // to the default "don't say anything").
-        if (
-          Services.prefs.getBoolPref("privacy.donottrackheader.enabled") &&
-          Services.prefs.getIntPref("privacy.donottrackheader.value") != 1
-        ) {
-          Services.prefs.clearUserPref("privacy.donottrackheader.enabled");
-        }
-
-        // This pref has been removed, so always clear it.
-        Services.prefs.clearUserPref("privacy.donottrackheader.value");
-      }
-
-      // Set the search activity default pref on app upgrade if it has not been set already.
-      if (!Services.prefs.prefHasUserValue("searchActivity.default.migrated")) {
-        Services.prefs.setBoolPref("searchActivity.default.migrated", true);
-        SearchEngines.migrateSearchActivityDefaultPref();
-      }
-
-      Reader.migrateCache().catch(e =>
-        Cu.reportError("Error migrating Reader cache: " + e)
-      );
-
-      // We removed this pref from user visible settings, so we should reset it.
-      // Power users can go into about:config to re-enable this if they choose.
-      if (Services.prefs.prefHasUserValue("nglayout.debug.paint_flashing")) {
-        Services.prefs.clearUserPref("nglayout.debug.paint_flashing");
-      }
-    }
-
-    if (currentUIVersion < 2) {
-      let name;
-      if (Services.prefs.prefHasUserValue("browser.search.defaultenginename")) {
-        name = Services.prefs.getCharPref("browser.search.defaultenginename");
-      }
-      if (
-        !name &&
-        Services.prefs.prefHasUserValue("browser.search.defaultenginename.US")
-      ) {
-        name = Services.prefs.getCharPref(
-          "browser.search.defaultenginename.US"
-        );
-      }
-      if (name) {
-        Services.search.init().then(() => {
-          let engine = Services.search.getEngineByName(name);
-          if (engine) {
-            Services.search.defaultEngine = engine;
-            Services.obs.notifyObservers(
-              null,
-              "default-search-engine-migrated"
-            );
-          }
-        });
-      }
-    }
-
-    if (currentUIVersion < 3) {
-      const kOldSafeBrowsingPref = "browser.safebrowsing.enabled";
-      // Default value is set to true, a user pref means that the pref was
-      // set to false.
-      if (
-        Services.prefs.prefHasUserValue(kOldSafeBrowsingPref) &&
-        !Services.prefs.getBoolPref(kOldSafeBrowsingPref)
-      ) {
-        Services.prefs.setBoolPref(
-          "browser.safebrowsing.phishing.enabled",
-          false
-        );
-        // Should just remove support for the pref entirely, even if it's
-        // only in about:config
-        Services.prefs.clearUserPref(kOldSafeBrowsingPref);
-      }
-    }
-
-    if (currentUIVersion < 4) {
-      // The handler app service will read this. We need to wait with migrating
-      // until the handler service has started up, so just set a pref here.
-      Services.prefs.setCharPref("browser.handlers.migrations", "30boxes");
-    }
-
-    // Update the migration version.
-    Services.prefs.setIntPref("browser.migration.version", UI_VERSION);
-  },
-
-  // This function returns false during periods where the browser displayed document is
-  // different from the browser content document, so user actions and some kinds of viewport
-  // updates should be ignored. This period starts when we start loading a new page or
-  // switch tabs, and ends when the new browser content document has been drawn and handed
-  // off to the compositor.
-  isBrowserContentDocumentDisplayed: function() {
-    try {
-      if (!Services.androidBridge.isContentDocumentDisplayed(window)) {
-        return false;
-      }
-    } catch (e) {
-      return false;
-    }
-
-    let tab = this.selectedTab;
-    if (!tab) {
-      return false;
-    }
-    return tab.contentDocumentIsDisplayed;
-  },
-
-  contentDocumentChanged: function() {
-    window.top.windowUtils.isFirstPaint = true;
-    Services.androidBridge.contentDocumentChanged(window);
-  },
-
-  get tabs() {
-    return this._tabs;
-  },
-
-  set selectedTab(aTab) {
-    if (this._selectedTab == aTab) {
-      return;
-    }
-
-    if (this._selectedTab) {
-      this._selectedTab.setActive(false);
-    }
-
-    this._selectedTab = aTab;
-    if (!aTab) {
-      return;
-    }
-
-    aTab.setActive(true);
-    this.contentDocumentChanged();
-    this.deck.selectedPanel = aTab.browser;
-    // Focus the browser so that things like selection will be styled correctly.
-    aTab.browser.focus();
-  },
-
-  get selectedBrowser() {
-    if (this._selectedTab) {
-      return this._selectedTab.browser;
-    }
-    return null;
-  },
-
-  getTabForId: function getTabForId(aId) {
-    let tabs = this._tabs;
-    for (let i = 0; i < tabs.length; i++) {
-      if (tabs[i].id == aId) {
-        return tabs[i];
-      }
-    }
-    return null;
-  },
-
-  getTabForBrowser: function getTabForBrowser(aBrowser) {
-    let tabs = this._tabs;
-    for (let i = 0; i < tabs.length; i++) {
-      if (tabs[i].browser == aBrowser) {
-        return tabs[i];
-      }
-    }
-    return null;
-  },
-
-  getTabForWindow: function getTabForWindow(aWindow) {
-    let tabs = this._tabs;
-    for (let i = 0; i < tabs.length; i++) {
-      if (tabs[i].browser.contentWindow == aWindow) {
-        return tabs[i];
-      }
-    }
-    return null;
-  },
-
-  getBrowserForWindow: function getBrowserForWindow(aWindow) {
-    let tabs = this._tabs;
-    for (let i = 0; i < tabs.length; i++) {
-      if (tabs[i].browser.contentWindow == aWindow) {
-        return tabs[i].browser;
-      }
-    }
-    return null;
-  },
-
-  getBrowserForDocument: function getBrowserForDocument(aDocument) {
-    let tabs = this._tabs;
-    for (let i = 0; i < tabs.length; i++) {
-      if (tabs[i].browser.contentDocument == aDocument) {
-        return tabs[i].browser;
-      }
-    }
-    return null;
-  },
-
-  // Use this instead of deck.selectedIndex (which is invalid for this purpose).
-  get selectedTabIndex() {
-    return this._tabs.indexOf(this._selectedTab);
-  },
-
-  loadURI: function loadURI(aURI, aBrowser, aParams) {
-    aBrowser = aBrowser || this.selectedBrowser;
-    if (!aBrowser) {
-      return;
-    }
-
-    aParams = aParams || {};
-
-    let flags =
-      "flags" in aParams ? aParams.flags : Ci.nsIWebNavigation.LOAD_FLAGS_NONE;
-    let postData =
-      "postData" in aParams && aParams.postData ? aParams.postData : null;
-    let referrerInfo =
-      "referrerURI" in aParams ? createReferrerInfo(aParams.referrerURI) : null;
-    let charset = "charset" in aParams ? aParams.charset : null;
-
-    let tab = this.getTabForBrowser(aBrowser);
-    if (tab) {
-      if ("userRequested" in aParams) {
-        tab.userRequested = aParams.userRequested;
-      }
-      tab.isSearch = "isSearch" in aParams ? aParams.isSearch : false;
-    }
-    // Don't fall back to System here Bug 1474619
-    let triggeringPrincipal =
-      "triggeringPrincipal" in aParams
-        ? aParams.triggeringPrincipal
-        : Services.scriptSecurityManager.getSystemPrincipal();
-
-    try {
-      aBrowser.loadURI(aURI, {
-        flags,
-        referrerInfo,
-        charset,
-        postData,
-        triggeringPrincipal,
-      });
-    } catch (e) {
-      if (tab) {
-        let message = {
-          type: "Content:LoadError",
-          tabID: tab.id,
-        };
-        GlobalEventDispatcher.sendRequest(message);
-        dump("Handled load error: " + e);
-      }
-    }
-  },
-
-  addTab: function addTab(aURI, aParams) {
-    aParams = aParams || {};
-
-    let fullscreenState;
-    if (this.selectedBrowser) {
-      fullscreenState = this.selectedBrowser.contentDocument.fullscreenElement;
-      if (fullscreenState) {
-        aParams.selected = false;
-      }
-    }
-
-    let newTab = new Tab(aURI, aParams);
-
-    if (fullscreenState) {
-      this.fullscreenTransitionTab = newTab;
-      this.selectedBrowser.contentDocument.exitFullscreen();
-    }
-
-    if (typeof aParams.tabIndex == "number") {
-      this._tabs.splice(aParams.tabIndex, 0, newTab);
-    } else {
-      this._tabs.push(newTab);
-    }
-
-    let selected = "selected" in aParams ? aParams.selected : true;
-    if (selected) {
-      this.selectedTab = newTab;
-    }
-
-    let evt = document.createEvent("UIEvents");
-    evt.initUIEvent("TabOpen", true, false, window, null);
-    newTab.browser.dispatchEvent(evt);
-
-    return newTab;
-  },
-
-  // Use this method to close a tab from JS. This method sends a message
-  // to Java to close the tab in the Java UI (we'll get a Tab:Closed message
-  // back from Java when that happens).
-  closeTab: function closeTab(aTab) {
-    if (!aTab) {
-      Cu.reportError("Error trying to close tab (tab doesn't exist)");
-      return;
-    }
-
-    let message = {
-      type: "Tab:Close",
-      tabID: aTab.id,
-    };
-    GlobalEventDispatcher.sendRequest(message);
-  },
-
-  // Calling this will update the state in BrowserApp after a tab has been
-  // closed in the Java UI.
-  _handleTabClosed: function _handleTabClosed(aTab, aShowUndoSnackbar) {
-    if (aTab == this.selectedTab) {
-      this.selectedTab = null;
-    }
-
-    let tabIndex = this._tabs.indexOf(aTab);
-
-    let evt = document.createEvent("UIEvents");
-    evt.initUIEvent("TabClose", true, false, window, tabIndex);
-    aTab.browser.dispatchEvent(evt);
-
-    let ss = Cc["@mozilla.org/browser/sessionstore;1"].getService(
-      Ci.nsISessionStore
-    );
-    if (aShowUndoSnackbar && ss.canUndoLastCloseTab) {
-      // Get a title for the undo close snackbar. Fall back to the URL if there is no title.
-      let closedTabData = ss.getClosedTabs(window)[0];
-
-      if (closedTabData) {
-        let message;
-        let title = closedTabData.entries[closedTabData.index - 1].title;
-        let isPrivate = PrivateBrowsingUtils.isBrowserPrivate(aTab.browser);
-
-        if (isPrivate) {
-          message = Strings.browser.GetStringFromName(
-            "privateClosedMessage.message"
-          );
-        } else if (title) {
-          message = Strings.browser.formatStringFromName(
-            "undoCloseToast.message",
-            [title]
-          );
-        } else {
-          message = Strings.browser.GetStringFromName(
-            "undoCloseToast.messageDefault"
-          );
-        }
-
-        Snackbars.show(message, Snackbars.LENGTH_LONG, {
-          action: {
-            label: Strings.browser.GetStringFromName("undoCloseToast.action2"),
-            callback: function() {
-              UITelemetry.addEvent("undo.1", "toast", null, "closetab");
-              ss.undoCloseTab(window, closedTabData);
-            },
-          },
-        });
-      }
-    }
-
-    // Retrieve updated tabIndex again for the removal because the index could
-    // be changed if a new tab is added by the event listener.
-    tabIndex = this._tabs.indexOf(aTab);
-    aTab.destroy();
-    this._tabs.splice(tabIndex, 1);
-  },
-
-  _handleTabMove(fromTabId, fromPosition, toTabId, toPosition) {
-    let movedTab = this._tabs[fromPosition];
-    if (movedTab.id != fromTabId || this._tabs[toPosition].id != toTabId) {
-      // The gecko and/or java Tabs tabs lists changed sometime between when the Tabs list was
-      // updated and when news of the update arrived here.
-      throw new Error(
-        "Moved tab mismatch: (" +
-          fromTabId +
-          ", " +
-          movedTab.id +
-          "), " +
-          "(" +
-          toTabId +
-          ", " +
-          this._tabs[toPosition].id +
-          ")"
-      );
-    }
-
-    let step = fromPosition < toPosition ? 1 : -1;
-    for (let i = fromPosition; i != toPosition; i += step) {
-      this._tabs[i] = this._tabs[i + step];
-    }
-    this._tabs[toPosition] = movedTab;
-
-    let evt = new UIEvent("TabMove", {
-      bubbles: true,
-      cancelable: false,
-      view: window,
-      detail: fromPosition,
-    });
-    this.tabs[toPosition].browser.dispatchEvent(evt);
-  },
-
-  // Use this method to select a tab from JS. This method sends a message
-  // to Java to select the tab in the Java UI (we'll get a Tab:Selected message
-  // back from Java when that happens).
-  selectTab: function selectTab(aTab) {
-    if (!aTab) {
-      Cu.reportError("Error trying to select tab (tab doesn't exist)");
-      return;
-    }
-
-    // There's nothing to do if the tab is already selected
-    if (aTab == this.selectedTab) {
-      return;
-    }
-
-    let doc = this.selectedBrowser.contentDocument;
-    if (doc.fullscreenElement) {
-      // We'll finish the tab selection once the fullscreen transition has ended,
-      // remember the new tab for this.
-      this.fullscreenTransitionTab = aTab;
-      doc.exitFullscreen();
-      return;
-    }
-
-    let message = {
-      type: "Tab:Select",
-      tabID: aTab.id,
-    };
-    GlobalEventDispatcher.sendRequest(message);
-  },
-
-  /**
-   * Gets an open tab with the given URL.
-   *
-   * @param  aURL URL to look for
-   * @param  aOptions Options for the search. Currently supports:
-   **  @option startsWith a Boolean indicating whether to search for a tab who's url starts with the
-   *           requested url. Useful if you want to ignore hash codes on the end of a url. For instance
-   *           to have about:downloads match about:downloads#123.
-   * @return the tab with the given URL, or null if no such tab exists
-   */
-  getTabWithURL: function getTabWithURL(aURL, aOptions) {
-    aOptions = aOptions || {};
-    let uri = Services.io.newURI(aURL);
-    for (let i = 0; i < this._tabs.length; ++i) {
-      let tab = this._tabs[i];
-      if (aOptions.startsWith) {
-        if (tab.currentURI.spec.startsWith(uri.spec)) {
-          return tab;
-        }
-      } else if (tab.currentURI.equals(uri)) {
-        return tab;
-      }
-    }
-    return null;
-  },
-
-  /**
-   * If a tab with the given URL already exists, that tab is selected.
-   * Otherwise, a new tab is opened with the given URL.
-   *
-   * @param aURL URL to open
-   * @param aParam Options used if a tab is created
-   * @param aFlags Options for the search. Currently supports:
-   **  @option startsWith a Boolean indicating whether to search for a tab who's url starts with the
-   *           requested url. Useful if you want to ignore hash codes on the end of a url. For instance
-   *           to have about:downloads match about:downloads#123.
-   */
-  selectOrAddTab: function selectOrAddTab(aURL, aParams, aFlags) {
-    let tab = this.getTabWithURL(aURL, aFlags);
-    if (tab == null) {
-      tab = this.addTab(aURL, aParams);
-    } else {
-      this.selectTab(tab);
-    }
-
-    return tab;
-  },
-
-  /**
-   * Open or select a tab with the "about:addons" page and optionally
-   * switch to the details page related to a defined addonId.
-   *
-   * @param {string} addonId
-   */
-  openAddonManager: function openAddonManager({ addonId }) {
-    if (addonId) {
-      let emWindow;
-
-      function receivePong(subject, topic, data) {
-        emWindow = subject;
-      }
-
-      Services.obs.addObserver(receivePong, "EM-pong");
-      Services.obs.notifyObservers(null, "EM-ping");
-      Services.obs.removeObserver(receivePong, "EM-pong");
-
-      if (emWindow) {
-        // "about:addons" has been already loaded in a tab.
-        emWindow.showAddonDetails(addonId);
-      } else {
-        // Wait for "about:addons" to be fully loaded.
-        function waitAboutAddons(subject, topic, data) {
-          Services.obs.removeObserver(waitAboutAddons, "EM-loaded");
-          emWindow = subject;
-
-          emWindow.showAddonDetails(addonId);
-        }
-        Services.obs.addObserver(waitAboutAddons, "EM-loaded");
-      }
-    }
-
-    BrowserApp.selectOrAddTab("about:addons", {
-      selected: true,
-      parentId: BrowserApp.selectedTab.id,
-    });
-  },
-
-  // This method updates the state in BrowserApp after a tab has been selected
-  // in the Java UI.
-  _handleTabSelected: function _handleTabSelected(aTab) {
-    if (this.fullscreenTransitionTab) {
-      // Defer updating to "fullscreenchange" if tab selection happened during
-      // a fullscreen transition.
-      return;
-    }
-    this.selectedTab = aTab;
-
-    let evt = document.createEvent("UIEvents");
-    evt.initUIEvent("TabSelect", true, false, window, null);
-    aTab.browser.dispatchEvent(evt);
-  },
-
-  viewSourceForTab(aTab) {
-    let browser = aTab.browser;
-    let outerWindowID = browser.outerWindowID;
-    let url = browser.currentURI.spec;
-    let args = { browser, outerWindowID, URL: url };
-
-    // `viewSourceInBrowser` will load the source content from the page
-    // descriptor for the tab (when possible) or fallback to the network if
-    // that fails.  Either way, the view source module will manage the tab's
-    // location, so use "about:blank" here to avoid unnecessary redundant
-    // requests.
-    let tab = this.addTab("about:blank", {
-      selected: true,
-      parentId: aTab.id,
-      isPrivate: PrivateBrowsingUtils.isBrowserPrivate(aTab.browser),
-    });
-    args.viewSourceBrowser = tab.browser;
-
-    gViewSourceUtils.viewSourceInBrowser(args);
-  },
-
-  quit: function quit(aClear = { sanitize: {}, dontSaveSession: false }) {
-    // Notify all windows that an application quit has been requested.
-    let cancelQuit = Cc["@mozilla.org/supports-PRBool;1"].createInstance(
-      Ci.nsISupportsPRBool
-    );
-    Services.obs.notifyObservers(cancelQuit, "quit-application-requested");
-
-    // Quit aborted.
-    if (cancelQuit.data) {
-      return;
-    }
-
-    Services.obs.notifyObservers(null, "quit-application-proceeding");
-
-    // Tell session store to forget about this window
-    if (aClear.dontSaveSession) {
-      let ss = Cc["@mozilla.org/browser/sessionstore;1"].getService(
-        Ci.nsISessionStore
-      );
-      ss.removeWindow(window);
-    }
-
-    BrowserApp.sanitize(
-      aClear.sanitize,
-      function() {
-        let appStartup = Services.startup;
-        appStartup.quit(Ci.nsIAppStartup.eForceQuit);
-      },
-      true
-    );
-  },
-
-  saveAsPDF: function saveAsPDF(aBrowser) {
-    RuntimePermissions.waitForPermissions(
-      RuntimePermissions.WRITE_EXTERNAL_STORAGE
-    ).then(function(permissionGranted) {
-      if (!permissionGranted) {
-        return;
-      }
-
-      (async () => {
-        let fileName = ContentAreaUtils.getDefaultFileName(
-          aBrowser.contentTitle,
-          aBrowser.currentURI,
-          null,
-          null
-        );
-        fileName = fileName.trim() + ".pdf";
-
-        let downloadsDir = await Downloads.getPreferredDownloadsDirectory();
-        let file = OS.Path.join(downloadsDir, fileName);
-
-        // Force this to have a unique name.
-        let openedFile = await OS.File.openUnique(file, {
-          humanReadable: true,
-        });
-        file = openedFile.path;
-        await openedFile.file.close();
-
-        let download = await Downloads.createDownload({
-          source: aBrowser.contentWindow,
-          target: file,
-          saver: "pdf",
-          startTime: Date.now(),
-        });
-
-        let list = await Downloads.getList(
-          download.source.isPrivate ? Downloads.PRIVATE : Downloads.PUBLIC
-        );
-        await list.add(download);
-        await download.start();
-      })();
-    });
-  },
-
-  // These values come from pref_tracking_protection_entries in arrays.xml.
-  PREF_TRACKING_PROTECTION_ENABLED: "2",
-  PREF_TRACKING_PROTECTION_ENABLED_PB: "1",
-  PREF_TRACKING_PROTECTION_DISABLED: "0",
-
-  /**
-   * Returns the current state of the tracking protection pref.
-   * (0 = Disabled, 1 = Enabled in PB, 2 = Enabled)
-   */
-  getTrackingProtectionState: function() {
-    if (Services.prefs.getBoolPref("privacy.trackingprotection.enabled")) {
-      return this.PREF_TRACKING_PROTECTION_ENABLED;
-    }
-    if (
-      Services.prefs.getBoolPref("privacy.trackingprotection.pbmode.enabled")
-    ) {
-      return this.PREF_TRACKING_PROTECTION_ENABLED_PB;
-    }
-    return this.PREF_TRACKING_PROTECTION_DISABLED;
-  },
-
-  sanitize: function(aItems, callback, aShutdown) {
-    let success = true;
-    var promises = [];
-    let refObj = {};
-
-    if (aShutdown && Object.getOwnPropertyNames(aItems).length > 0) {
-      let msg = Strings.browser.GetStringFromName("alertShutdownSanitize");
-      Snackbars.show(msg, Snackbars.LENGTH_INDEFINITE);
-    }
-
-    TelemetryStopwatch.start("FX_SANITIZE_TOTAL", refObj);
-
-    for (let key in aItems) {
-      if (!aItems[key]) {
-        continue;
-      }
-
-      key = key.replace("private.data.", "");
-
-      switch (key) {
-        case "cookies_sessions":
-          promises.push(Sanitizer.clearItem("cookies"));
-          promises.push(Sanitizer.clearItem("sessions"));
-          break;
-        case "downloadFiles":
-          // If the user is quiting the app and the downloads are to be sanitized
-          // means he chose to "Clear private data -> Downloads" upon exit so
-          // all downloads will be purged, irrespective of their current state (in progress/error/completed)
-          let clearUnfinishedDownloads = aShutdown === true;
-          promises.push(
-            Sanitizer.clearItem(key, undefined, clearUnfinishedDownloads)
-          );
-          break;
-        case "openTabs":
-          if (aShutdown === true) {
-            Services.obs.notifyObservers(null, "browser:purge-session-tabs");
-            break;
-          }
-        // fall-through if aShutdown is false
-        default:
-          promises.push(Sanitizer.clearItem(key));
-      }
-    }
-
-    Promise.all(promises)
-      .then(function() {
-        TelemetryStopwatch.finish("FX_SANITIZE_TOTAL", refObj);
-        GlobalEventDispatcher.sendRequest({
-          type: "Sanitize:Finished",
-          success: true,
-          shutdown: aShutdown === true,
-        });
-
-        if (callback) {
-          callback();
-        }
-      })
-      .catch(function(err) {
-        TelemetryStopwatch.finish("FX_SANITIZE_TOTAL", refObj);
-        GlobalEventDispatcher.sendRequest({
-          type: "Sanitize:Finished",
-          error: err,
-          success: false,
-          shutdown: aShutdown === true,
-        });
-
-        if (callback) {
-          callback();
-        }
-      });
-  },
-
-  getFocusedInput: function(aBrowser, aOnlyInputElements = false) {
-    if (!aBrowser) {
-      return null;
-    }
-
-    let doc = aBrowser.contentDocument;
-    if (!doc) {
-      return null;
-    }
-
-    let focused = doc.activeElement;
-    while (
-      focused instanceof HTMLFrameElement ||
-      focused instanceof HTMLIFrameElement
-    ) {
-      doc = focused.contentDocument;
-      focused = doc.activeElement;
-    }
-
-    if (
-      focused instanceof HTMLInputElement &&
-      (focused.mozIsTextField(false) || focused.type === "number")
-    ) {
-      return focused;
-    }
-
-    if (aOnlyInputElements) {
-      return null;
-    }
-
-    if (
-      focused &&
-      (focused instanceof HTMLTextAreaElement || focused.isContentEditable)
-    ) {
-      if (focused instanceof HTMLBodyElement) {
-        // we are putting focus into a contentEditable frame. scroll the frame into
-        // view instead of the contentEditable document contained within, because that
-        // results in a better user experience
-        focused = focused.ownerGlobal.frameElement;
-      }
-      return focused;
-    }
-    return null;
-  },
-
-  scrollToFocusedInput: function(aBrowser) {
-    let formHelperMode = Services.prefs.getIntPref("formhelper.mode");
-    if (formHelperMode == kFormHelperModeDisabled) {
-      return;
-    }
-
-    let dwu = aBrowser.contentWindow.windowUtils;
-    if (!dwu) {
-      return;
-    }
-
-    let zoomToFocusedInput = function() {
-      if (!dwu.flushApzRepaints()) {
-        dwu.zoomToFocusedInput();
-        return;
-      }
-      Services.obs.addObserver(function apzFlushDone() {
-        Services.obs.removeObserver(apzFlushDone, "apz-repaints-flushed");
-        dwu.zoomToFocusedInput();
-      }, "apz-repaints-flushed");
-    };
-
-    let gotResize = false;
-    let onResize = function() {
-      gotResize = true;
-      if (dwu.isMozAfterPaintPending) {
-        addEventListener("MozAfterPaint", zoomToFocusedInput, { once: true });
-      } else {
-        zoomToFocusedInput();
-      }
-    };
-
-    aBrowser.contentWindow.addEventListener("resize", onResize);
-
-    // When the keyboard is displayed, we can get one resize event, multiple
-    // resize events, or none at all. Try to handle all these cases by allowing
-    // resizing within a set interval, and still zoom to input if there is no
-    // resize event at the end of the interval.
-    setTimeout(function(e) {
-      aBrowser.contentWindow.removeEventListener("resize", onResize);
-      if (!gotResize) {
-        onResize();
-      }
-    }, 500);
-  },
-
-  getUALocalePref: function() {
-    return Services.locale.requestedLocale || undefined;
-  },
-
-  getOSLocalePref: function() {
-    try {
-      return Services.prefs.getCharPref("intl.locale.os");
-    } catch (e) {
-      return undefined;
-    }
-  },
-
-  setLocalizedPref: function(pref, value) {
-    let pls = Cc["@mozilla.org/pref-localizedstring;1"].createInstance(
-      Ci.nsIPrefLocalizedString
-    );
-    pls.data = value;
-    Services.prefs.setComplexValue(pref, Ci.nsIPrefLocalizedString, pls);
-  },
-
-  // eslint-disable-next-line complexity
-  onEvent: function(event, data, callback) {
-    let browser = this.selectedBrowser;
-
-    switch (event) {
-      case "Browser:LoadManifest": {
-        installManifest(browser, data);
-        break;
-      }
-
-      case "Browser:Quit":
-        this.quit(data);
-        break;
-
-      case "Fonts:Reload":
-        FontEnumerator.updateFontList();
-        break;
-
-      case "DesktopMode:Change":
-        let tab = this.getTabForId(data.tabId);
-        if (tab) {
-          tab.reloadWithMode(data.desktopMode);
-        }
-        break;
-
-      case "FormHistory:Init": {
-        // Force creation/upgrade of formhistory.sqlite
-        FormHistory.count(
-          {},
-          {
-            handleCompletion() {
-              GlobalEventDispatcher.sendRequest({ type: "FormHistory:Ready" });
-            },
-          }
-        );
-        GlobalEventDispatcher.unregisterListener(this, event);
-        break;
-      }
-
-      case "FullScreen:Exit":
-        browser.contentDocument.exitFullscreen();
-        break;
-
-      case "Locale:OS": {
-        // We know the system locale. We use this for generating Accept-Language headers.
-        let languageTag = data.languageTag;
-        let currentOSLocale = this.getOSLocalePref();
-        if (currentOSLocale == languageTag) {
-          break;
-        }
-
-        // Ensure that this choice is immediately persisted, because
-        // Gecko won't be told again if it forgets.
-        Services.prefs.setCharPref("intl.locale.os", languageTag);
-        Services.prefs.savePrefFile(null);
-
-        this.computeAcceptLanguages(languageTag);
-
-        // Rebuild strings, in case we're mirroring OS locale.
-        Strings.flush();
-        break;
-      }
-
-      case "Locale:Changed": {
-        if (data) {
-          Services.locale.requestedLocales = [data.languageTag];
-        } else {
-          Services.locale.requestedLocales = [];
-        }
-
-        // Rebuild strings to reflect the new locale.
-        Strings.flush();
-
-        // Make sure we use the right Accept-Language header.
-        let osLocale = Services.prefs.getCharPref("intl.locale.os");
-
-        this.computeAcceptLanguages(osLocale);
-        break;
-      }
-
-      case "Passwords:Init": {
-        let storage = Cc[
-          "@mozilla.org/login-manager/storage/mozStorage;1"
-        ].getService(Ci.nsILoginManagerStorage);
-        storage.initialize();
-        GlobalEventDispatcher.unregisterListener(this, event);
-        break;
-      }
-
-      case "Sanitize:ClearData":
-        this.sanitize(data);
-        break;
-
-      case "SaveAs:PDF":
-        this.saveAsPDF(browser);
-        break;
-
-      case "GeckoView:ZoomToInput": {
-        // these messages come from a change in the viewable area and not user interaction
-        // we allow scrolling to the selected input, but not zooming the page
-        this.scrollToFocusedInput(browser);
-        break;
-      }
-
-      case "Telemetry:CustomTabsPing": {
-        TelemetryController.submitExternalPing(
-          "anonymous",
-          { client: data.client },
-          { addClientId: false }
-        );
-        break;
-      }
-
-      case "Session:GetHistory": {
-        callback.onSuccess(this.getHistory(data));
-        break;
-      }
-
-      case "Session:Back":
-        browser.goBack();
-        break;
-
-      case "Session:Forward":
-        browser.goForward();
-        break;
-
-      case "Session:Navigate": {
-        let index = data.index;
-        let webNav = BrowserApp.selectedTab.window.docShell.QueryInterface(
-          Ci.nsIWebNavigation
-        );
-        let historySize = webNav.sessionHistory.count;
-
-        if (index < 0) {
-          index = 0;
-          Log.e("Browser", "Negative index truncated to zero");
-        } else if (index >= historySize) {
-          Log.e(
-            "Browser",
-            "Incorrect index " + index + " truncated to " + historySize - 1
-          );
-          index = historySize - 1;
-        }
-
-        browser.gotoIndex(index);
-        break;
-      }
-
-      case "Session:Reload": {
-        let flags = Ci.nsIWebNavigation.LOAD_FLAGS_NONE;
-
-        // Check to see if this is a message to enable/disable mixed content blocking.
-        if (data) {
-          if (data.bypassCache) {
-            flags |=
-              Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_CACHE |
-              Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_PROXY;
-          }
-
-          if (data.contentType === "tracking") {
-            if (data.allowContent) {
-              ContentBlockingAllowList.add(browser);
-              if (!PrivateBrowsingUtils.isBrowserPrivate(browser)) {
-                Telemetry.addData("TRACKING_PROTECTION_EVENTS", 1);
-              }
-            } else {
-              ContentBlockingAllowList.remove(browser);
-              if (!PrivateBrowsingUtils.isBrowserPrivate(browser)) {
-                Telemetry.addData("TRACKING_PROTECTION_EVENTS", 2);
-              }
-            }
-          }
-        }
-
-        // Try to use the session history to reload so that framesets are
-        // handled properly. If the window has no session history, fall back
-        // to using the web navigation's reload method.
-        let webNav = browser.webNavigation;
-        try {
-          let sh = webNav.sessionHistory;
-          if (sh) {
-            webNav = sh.legacySHistory.QueryInterface(Ci.nsIWebNavigation);
-          }
-        } catch (e) {}
-        webNav.reload(flags);
-        break;
-      }
-
-      case "Session:Restore":
-        GlobalEventDispatcher.dispatch("Session:Restore", data);
-        break;
-
-      case "Session:Stop":
-        browser.stop();
-        break;
-
-      case "Tab:Load": {
-        let url = data.url;
-        let flags =
-          Ci.nsIWebNavigation.LOAD_FLAGS_ALLOW_THIRD_PARTY_FIXUP |
-          Ci.nsIWebNavigation.LOAD_FLAGS_FIXUP_SCHEME_TYPOS;
-
-        // Pass LOAD_FLAGS_DISALLOW_INHERIT_PRINCIPAL to prevent any loads from
-        // inheriting the currently loaded document's principal.
-        if (data.userEntered) {
-          flags |= Ci.nsIWebNavigation.LOAD_FLAGS_DISALLOW_INHERIT_PRINCIPAL;
-        }
-
-        let delayLoad = "delayLoad" in data ? data.delayLoad : false;
-        let params = {
-          selected: "selected" in data ? data.selected : !delayLoad,
-          parentId: "parentId" in data ? data.parentId : -1,
-          flags: flags,
-          tabID: data.tabID,
-          isPrivate: data.isPrivate === true,
-          pinned: data.pinned === true,
-          delayLoad: delayLoad === true,
-          desktopMode: data.desktopMode === true,
-        };
-
-        params.userRequested = url;
-
-        if (data.referrerURI) {
-          try {
-            params.referrerURI = Services.io.newURI(data.referrerURI);
-          } catch (e) {
-            console.warn("Tab:Load referrerURI is invalid - ignoring."); // don't log exception to avoid leaking urls.
-            params.referrerURI = null;
-          }
-        }
-
-        if (data.engine) {
-          let engine = Services.search.getEngineByName(data.engine);
-          if (engine) {
-            let submission = engine.getSubmission(url);
-            url = submission.uri.spec;
-            params.postData = submission.postData;
-            params.isSearch = true;
-          }
-        }
-
-        if (data.newTab) {
-          this.addTab(url, params);
-        } else {
-          if (data.tabId) {
-            // Use a specific browser instead of the selected browser, if it exists
-            let specificBrowser = this.getTabForId(data.tabId).browser;
-            if (specificBrowser) {
-              browser = specificBrowser;
-            }
-          }
-          this.loadURI(url, browser, params);
-        }
-        break;
-      }
-
-      case "Tab:OpenUri":
-        window.browserDOMWindow.openURI(
-          Services.io.newURI(data.uri),
-          /* opener */ null,
-          Ci.nsIBrowserDOMWindow[data.flags],
-          Ci.nsIBrowserDOMWindow.OPEN_EXTERNAL,
-          /* triggeringPrincipal */ null
-        );
-        break;
-
-      case "Tab:Selected":
-        this._handleTabSelected(this.getTabForId(data.id));
-        break;
-
-      case "Tab:Closed": {
-        this._handleTabClosed(this.getTabForId(data.tabId), data.showUndoToast);
-        break;
-      }
-
-      case "Tab:Move":
-        this._handleTabMove(
-          data.fromTabId,
-          data.fromPosition,
-          data.toTabId,
-          data.toPosition
-        );
-        break;
-
-      case "Tab:ViewSource":
-        this.viewSourceForTab(this.getTabForId(data.tabId));
-        break;
-    }
-  },
-
-  observe: function(aSubject, aTopic, aData) {
-    let browser = this.selectedBrowser;
-
-    switch (aTopic) {
-      case "keyword-search":
-        // This event refers to a search via the URL bar, not a bookmarks
-        // keyword search. Note that this code assumes that the user can only
-        // perform a keyword search on the selected tab.
-        this.selectedTab.isSearch = true;
-
-        // Don't store queries in private browsing mode.
-        let isPrivate = PrivateBrowsingUtils.isBrowserPrivate(
-          this.selectedTab.browser
-        );
-        let query = isPrivate ? "" : aData;
-
-        let engine = aSubject.QueryInterface(Ci.nsISearchEngine);
-        GlobalEventDispatcher.sendRequest({
-          type: "Search:Keyword",
-          identifier: engine.identifier,
-          name: engine.name,
-          query: query,
-        });
-        break;
-
-      case "android-get-pref": {
-        // These pref names are not "real" pref names. They are used in the
-        // setting menu, and these are passed when initializing the setting
-        // menu. aSubject is a nsIWritableVariant to hold the pref value.
-        aSubject.QueryInterface(Ci.nsIWritableVariant);
-
-        switch (aData) {
-          // Handle master password
-          case "privacy.masterpassword.enabled":
-            aSubject.setAsBool(MasterPassword.enabled);
-            break;
-
-          case "privacy.trackingprotection.state": {
-            aSubject.setAsAString(this.getTrackingProtectionState());
-            break;
-          }
-
-          // Crash reporter submit pref must be fetched from nsICrashReporter
-          // service.
-          case "datareporting.crashreporter.submitEnabled":
-            if (AppConstants.MOZ_CRASHREPORTER) {
-              aSubject.setAsBool(Services.appinfo.submitReports);
-            }
-            break;
-        }
-        break;
-      }
-
-      case "android-set-pref": {
-        // Pseudo-prefs. aSubject is an nsIWritableVariant that holds the pref
-        // value. Set to empty to signal the pref was handled.
-        aSubject.QueryInterface(Ci.nsIWritableVariant);
-        let value = aSubject.QueryInterface(Ci.nsIVariant);
-
-        switch (aData) {
-          // MasterPassword pref is not real, we just need take action and leave
-          case "privacy.masterpassword.enabled":
-            if (MasterPassword.enabled) {
-              MasterPassword.removePassword(value);
-            } else {
-              MasterPassword.setPassword(value);
-            }
-            aSubject.setAsEmpty();
-            break;
-
-          // "privacy.trackingprotection.state" is not a "real" pref name, but
-          // it's used in the setting menu.  By default
-          // "privacy.trackingprotection.pbmode.enabled" is true, and
-          // "privacy.trackingprotection.enabled" is false.
-          case "privacy.trackingprotection.state": {
-            switch (value) {
-              // Tracking protection disabled.
-              case this.PREF_TRACKING_PROTECTION_DISABLED:
-                Services.prefs.setBoolPref(
-                  "privacy.trackingprotection.pbmode.enabled",
-                  false
-                );
-                Services.prefs.setBoolPref(
-                  "privacy.trackingprotection.enabled",
-                  false
-                );
-                break;
-              // Tracking protection only in private browsing,
-              case this.PREF_TRACKING_PROTECTION_ENABLED_PB:
-                Services.prefs.setBoolPref(
-                  "privacy.trackingprotection.pbmode.enabled",
-                  true
-                );
-                Services.prefs.setBoolPref(
-                  "privacy.trackingprotection.enabled",
-                  false
-                );
-                break;
-              // Tracking protection everywhere.
-              case this.PREF_TRACKING_PROTECTION_ENABLED:
-                Services.prefs.setBoolPref(
-                  "privacy.trackingprotection.pbmode.enabled",
-                  true
-                );
-                Services.prefs.setBoolPref(
-                  "privacy.trackingprotection.enabled",
-                  true
-                );
-                break;
-            }
-            aSubject.setAsEmpty();
-            break;
-          }
-
-          // Crash reporter preference is in a service; set and return.
-          case "datareporting.crashreporter.submitEnabled":
-            if (AppConstants.MOZ_CRASHREPORTER) {
-              Services.appinfo.submitReports = value;
-              aSubject.setAsEmpty();
-            }
-            break;
-        }
-        break;
-      }
-
-      case "gather-telemetry":
-        GlobalEventDispatcher.sendRequest({ type: "Telemetry:Gather" });
-        break;
-
-      case "Vibration:Request":
-        if (aSubject instanceof Navigator) {
-          let navigator = aSubject;
-          let buttons = [
-            {
-              label: Strings.browser.GetStringFromName(
-                "vibrationRequest.denyButton"
-              ),
-              callback: function() {
-                navigator.setVibrationPermission(false);
-              },
-            },
-            {
-              label: Strings.browser.GetStringFromName(
-                "vibrationRequest.allowButton"
-              ),
-              callback: function() {
-                navigator.setVibrationPermission(true);
-              },
-              positive: true,
-            },
-          ];
-          let message = Strings.browser.GetStringFromName(
-            "vibrationRequest.message"
-          );
-          let options = {};
-          NativeWindow.doorhanger.show(
-            message,
-            "vibration-request",
-            buttons,
-            BrowserApp.selectedTab.id,
-            options,
-            "VIBRATION"
-          );
-        }
-        break;
-
-      default:
-        dump('BrowserApp.observe: unexpected topic "' + aTopic + '"\n');
-        break;
-    }
-  },
-
-  /**
-   * Set intl.accept_languages accordingly.
-   *
-   * After Bug 881510 this will also accept a real Accept-Language choice as
-   * input; all Accept-Language logic lives here.
-   *
-   * osLocale should never be null, but this method is safe regardless.
-   * appLocale may explicitly be null.
-   */
-  computeAcceptLanguages(osLocale) {
-    let defaultBranch = Services.prefs.getDefaultBranch(null);
-    let defaultAccept = defaultBranch.getComplexValue(
-      "intl.accept_languages",
-      Ci.nsIPrefLocalizedString
-    ).data;
-
-    // A guard for potential breakage. Bug 438031.
-    // This should not be necessary, because we're reading from the default branch,
-    // but better safe than sorry.
-    if (defaultAccept && defaultAccept.startsWith("chrome://")) {
-      defaultAccept = null;
-    } else {
-      // Ensure lowercase everywhere so we can compare.
-      defaultAccept = defaultAccept.toLowerCase();
-    }
-
-    try {
-      const resistFingerprinting = Services.prefs.getBoolPref(
-        "privacy.resistFingerprinting"
-      );
-      if (resistFingerprinting) {
-        osLocale = null;
-      }
-    } catch (e) {}
-
-    // Explicitly-set app prefs come first:
-    let chosen = Services.prefs
-      .getCharPref("intl.locale.requested", "")
-      .split(",")
-      .map(x => x.trim().toLowerCase())
-      .filter(x => x.length > 0);
-
-    // OS prefs come second:
-    if (osLocale) {
-      osLocale = osLocale.toLowerCase();
-      if (!chosen.includes(osLocale)) {
-        chosen.push(osLocale);
-      }
-    }
-
-    // Default app prefs come third:
-    if (defaultAccept) {
-      // intl.accept_languages is a comma-separated list, with no q-value params. Those
-      // are added when the header is generated.
-      let defaults = defaultAccept.split(",").map(x => x.trim());
-      for (let locale of defaults) {
-        if (!chosen.includes(locale)) {
-          chosen.push(locale);
-        }
-      }
-    }
-
-    let result = chosen.join(",");
-    this.setLocalizedPref("intl.accept_languages", result);
-  },
-
-  // nsIAndroidBrowserApp
-  get selectedTab() {
-    return this._selectedTab;
-  },
-
-  // nsIAndroidBrowserApp
-  getBrowserTab: function(tabId) {
-    return this.getTabForId(tabId);
-  },
-
-  getUITelemetryObserver: function() {
-    return UITelemetry;
-  },
-
-  // This method will return a list of history items and toIndex based on the action provided from the fromIndex to toIndex,
-  // optionally selecting selIndex (if fromIndex <= selIndex <= toIndex)
-  getHistory: function(data) {
-    let action = data.action;
-    let webNav = BrowserApp.getTabForId(
-      data.tabId
-    ).window.docShell.QueryInterface(Ci.nsIWebNavigation);
-    let historyIndex = webNav.sessionHistory.index;
-    let historySize = webNav.sessionHistory.count;
-    let canGoBack = webNav.canGoBack;
-    let canGoForward = webNav.canGoForward;
-    let listitems = [];
-    let fromIndex = 0;
-    let toIndex = historySize - 1;
-    let selIndex = historyIndex;
-
-    if (action == "BACK" && canGoBack) {
-      fromIndex = Math.max(historyIndex - kMaxHistoryListSize, 0);
-      toIndex = historyIndex;
-      selIndex = historyIndex;
-    } else if (action == "FORWARD" && canGoForward) {
-      fromIndex = historyIndex;
-      toIndex = Math.min(historySize - 1, historyIndex + kMaxHistoryListSize);
-      selIndex = historyIndex;
-    } else if (action == "ALL" && (canGoBack || canGoForward)) {
-      fromIndex = historyIndex - kMaxHistoryListSize / 2;
-      toIndex = historyIndex + kMaxHistoryListSize / 2;
-      if (fromIndex < 0) {
-        toIndex -= fromIndex;
-      }
-
-      if (toIndex > historySize - 1) {
-        fromIndex -= toIndex - (historySize - 1);
-        toIndex = historySize - 1;
-      }
-
-      fromIndex = Math.max(fromIndex, 0);
-      selIndex = historyIndex;
-    } else {
-      // return empty list immediately.
-      return {
-        historyItems: listitems,
-        toIndex: toIndex,
-      };
-    }
-
-    let browser = this.selectedBrowser;
-    let hist = browser.sessionHistory.legacySHistory;
-    for (let i = toIndex; i >= fromIndex; i--) {
-      let entry = hist.getEntryAtIndex(i);
-      let item = {
-        title: entry.title || entry.URI.displaySpec,
-        url: entry.URI.displaySpec,
-        selected: i == selIndex,
-      };
-      listitems.push(item);
-    }
-
-    return {
-      historyItems: listitems,
-      toIndex: toIndex,
-    };
-  },
-};
-
-async function notifyManifestStatus(tab) {
-  try {
-    const manifest = await Manifests.getManifest(tab.browser);
-    const evtType =
-      manifest && manifest.installed ? "Website:AppEntered" : "Website:AppLeft";
-
-    GlobalEventDispatcher.sendRequest({
-      type: evtType,
-      tabId: tab.id,
-    });
-  } catch (err) {
-    Cu.reportError("Error sending status: " + err.message);
-  }
-}
-
-async function installManifest(browser, data) {
-  try {
-    const manifest = await Manifests.getManifest(browser, data.manifestUrl);
-    await manifest.install();
-    const icon = await manifest.icon(data.iconSize);
-    GlobalEventDispatcher.sendRequest({
-      type: "Website:AppInstalled",
-      icon,
-      name: manifest.name,
-      start_url: manifest.start_url,
-      manifest_path: manifest.path,
-      manifest_url: manifest.url,
-    });
-  } catch (err) {
-    Cu.reportError("Failed to install: " + err.message);
-    // If we fail to install via the manifest, we will fall back to a standard bookmark
-    GlobalEventDispatcher.sendRequest({
-      type: "Website:AppInstallFailed",
-      url: data.originalUrl,
-      title: data.originalTitle,
-    });
-  }
-}
-
-var NativeWindow = {
-  init: function() {
-    GlobalEventDispatcher.registerListener(this, [
-      "Doorhanger:Reply",
-      "Menu:Clicked",
-    ]);
-    this.contextmenus.init();
-  },
-
-  menu: {
-    _callbacks: [],
-    // This value must be kept in sync with GECKO_TOOLS_MENU_UUID in AddonUICache.java.
-    toolsMenuID: "{115b9308-2023-44f1-a4e9-3e2197669f07}",
-    add: function() {
-      let options;
-      if (arguments.length == 1) {
-        options = arguments[0];
-      } else if (arguments.length == 3) {
-        Log.w(
-          "Browser",
-          "This menu addon API has been deprecated. Instead, use the options object API."
-        );
-        options = {
-          name: arguments[0],
-          callback: arguments[2],
-        };
-      } else {
-        throw new Error("Incorrect number of parameters");
-      }
-
-      options.type = "Menu:Add";
-      options.uuid = uuidgen.generateUUID().toString();
-
-      GlobalEventDispatcher.sendRequest(options);
-      this._callbacks[options.uuid] = options.callback;
-      return options.uuid;
-    },
-
-    remove: function(aUuid) {
-      GlobalEventDispatcher.sendRequest({ type: "Menu:Remove", uuid: aUuid });
-    },
-
-    update: function(aUuid, aOptions) {
-      if (!aOptions) {
-        return;
-      }
-
-      GlobalEventDispatcher.sendRequest({
-        type: "Menu:Update",
-        uuid: aUuid,
-        options: aOptions,
-      });
-    },
-  },
-
-  doorhanger: {
-    _callbacks: {},
-    _callbacksId: 0,
-    _promptId: 0,
-
-    /**
-     * @param aOptions
-     *        An options JavaScript object holding additional properties for the
-     *        notification. The following properties are currently supported:
-     *        persistence: An integer. The notification will not automatically
-     *                     dismiss for this many page loads. If persistence is set
-     *                     to -1, the doorhanger will never automatically dismiss.
-     *        persistWhileVisible:
-     *                     A boolean. If true, a visible notification will always
-     *                     persist across location changes.
-     *        timeout:     A time in milliseconds. The notification will not
-     *                     automatically dismiss before this time.
-     *
-     *        checkbox:    A string to appear next to a checkbox under the notification
-     *                     message. The button callback functions will be called with
-     *                     the checked state as an argument.
-     *
-     *        actionText:  An object that specifies a clickable string, a type of action,
-     *                     and a bundle blob for the consumer to create a click action.
-     *                     { text: <text>,
-     *                       type: <type>,
-     *                       bundle: <blob-object> }
-     *
-     *        defaultCallback:
-     *                     Callback invoked when the doorhanger is dismissed without
-     *                     pressing a button.
-     *
-     * @param aCategory
-     *        Doorhanger type to display (e.g., LOGIN)
-     */
-    show: function(aMessage, aValue, aButtons, aTabID, aOptions, aCategory) {
-      if (aButtons == null) {
-        aButtons = [];
-      }
-
-      if (aButtons.length > 2) {
-        console.warn("Doorhanger can have a maximum of two buttons!");
-        aButtons.length = 2;
-      }
-
-      aButtons.forEach(aButton => {
-        this._callbacks[this._callbacksId] = {
-          cb: aButton.callback,
-          prompt: this._promptId,
-        };
-        aButton.callback = this._callbacksId;
-        this._callbacksId++;
-      });
-
-      this._callbacks[this._callbacksId] = {
-        cb: aOptions && aOptions.defaultCallback,
-        prompt: this._promptId,
-      };
-      if (aOptions && aOptions.defaultCallback) {
-        aOptions.defaultCallback = undefined;
-      }
-      let defaultCallback = this._callbacksId;
-      this._callbacksId++;
-
-      this._promptId++;
-      let json = {
-        type: "Doorhanger:Add",
-        message: aMessage,
-        value: aValue,
-        buttons: aButtons,
-        // use the current tab if none is provided
-        tabID: aTabID || BrowserApp.selectedTab.id,
-        options: aOptions || {},
-        category: aCategory,
-        defaultCallback: defaultCallback,
-      };
-      WindowEventDispatcher.sendRequest(json);
-    },
-
-    hide: function(aValue, aTabID) {
-      WindowEventDispatcher.sendRequest({
-        type: "Doorhanger:Remove",
-        value: aValue,
-        tabID: aTabID,
-      });
-    },
-  },
-
-  onEvent: function(event, data, callback) {
-    if (event == "Doorhanger:Reply") {
-      let reply_id = data.callback;
-
-      if (this.doorhanger._callbacks[reply_id]) {
-        // Pass the value of the optional checkbox to the callback
-        if (this.doorhanger._callbacks[reply_id].cb) {
-          let checked = data.checked;
-          this.doorhanger._callbacks[reply_id].cb(checked, data.inputs);
-        }
-
-        let prompt = this.doorhanger._callbacks[reply_id].prompt;
-        for (let id in this.doorhanger._callbacks) {
-          if (this.doorhanger._callbacks[id].prompt == prompt) {
-            delete this.doorhanger._callbacks[id];
-          }
-        }
-      }
-    } else if (event == "Menu:Clicked") {
-      if (this.menu._callbacks[data.item]) {
-        this.menu._callbacks[data.item]();
-      }
-    }
-  },
-
-  contextmenus: {
-    items: {}, //  a list of context menu items that we may show
-    DEFAULT_HTML5_ORDER: -1, // Sort order for HTML5 context menu items
-
-    init: function() {
-      // Accessing "NativeWindow.contextmenus" initializes context menus if needed.
-      BrowserApp.deck.addEventListener("contextmenu", e =>
-        NativeWindow.contextmenus.show(e)
-      );
-    },
-
-    add: function() {
-      let args;
-      if (arguments.length == 1) {
-        args = arguments[0];
-      } else if (arguments.length == 3) {
-        args = {
-          label: arguments[0],
-          selector: arguments[1],
-          callback: arguments[2],
-        };
-      } else {
-        throw new Error("Incorrect number of parameters");
-      }
-
-      if (!args.label) {
-        throw new Error("Menu items must have a name");
-      }
-
-      let cmItem = new ContextMenuItem(args);
-      this.items[cmItem.id] = cmItem;
-      return cmItem.id;
-    },
-
-    remove: function(aId) {
-      delete this.items[aId];
-    },
-
-    // Although we do not use this ourselves anymore, add-ons may still
-    // need it as it has been documented, so we shouldn't remove it.
-    SelectorContext: function(aSelector) {
-      return {
-        matches: function(aElt) {
-          if (aElt.matches) {
-            return aElt.matches(aSelector);
-          }
-          return false;
-        },
-      };
-    },
-
-    linkOpenableNonPrivateContext: {
-      matches: function linkOpenableNonPrivateContextMatches(aElement) {
-        let doc = aElement.ownerDocument;
-        if (
-          !doc ||
-          PrivateBrowsingUtils.isContentWindowPrivate(doc.defaultView)
-        ) {
-          return false;
-        }
-
-        return NativeWindow.contextmenus.linkOpenableContext.matches(aElement);
-      },
-    },
-
-    linkOpenableContext: {
-      matches: function linkOpenableContextMatches(aElement) {
-        let uri = NativeWindow.contextmenus._getLink(aElement);
-        if (uri) {
-          let scheme = uri.scheme;
-          let dontOpen = /^(javascript|mailto|news|snews|tel)$/;
-          return scheme && !dontOpen.test(scheme);
-        }
-        return false;
-      },
-    },
-
-    linkCopyableContext: {
-      matches: function linkCopyableContextMatches(aElement) {
-        let uri = NativeWindow.contextmenus._getLink(aElement);
-        if (uri) {
-          let scheme = uri.scheme;
-          let dontCopy = /^(mailto|tel)$/;
-          return scheme && !dontCopy.test(scheme);
-        }
-        return false;
-      },
-    },
-
-    linkShareableContext: {
-      matches: function linkShareableContextMatches(aElement) {
-        let uri = NativeWindow.contextmenus._getLink(aElement);
-        if (uri) {
-          let scheme = uri.scheme;
-          let dontShare = /^(about|chrome|file|javascript|mailto|resource|tel)$/;
-          return scheme && !dontShare.test(scheme);
-        }
-        return false;
-      },
-    },
-
-    linkBookmarkableContext: {
-      matches: function linkBookmarkableContextMatches(aElement) {
-        let uri = NativeWindow.contextmenus._getLink(aElement);
-        if (uri) {
-          let scheme = uri.scheme;
-          let dontBookmark = /^(mailto|tel)$/;
-          return scheme && !dontBookmark.test(scheme);
-        }
-        return false;
-      },
-    },
-
-    emailLinkContext: {
-      matches: function emailLinkContextMatches(aElement) {
-        let uri = NativeWindow.contextmenus._getLink(aElement);
-        if (uri) {
-          return uri.schemeIs("mailto");
-        }
-        return false;
-      },
-    },
-
-    phoneNumberLinkContext: {
-      matches: function phoneNumberLinkContextMatches(aElement) {
-        let uri = NativeWindow.contextmenus._getLink(aElement);
-        if (uri) {
-          return uri.schemeIs("tel");
-        }
-        return false;
-      },
-    },
-
-    imageLocationCopyableContext: {
-      matches: function imageLinkCopyableContextMatches(aElement) {
-        if (ChromeUtils.getClassName(aElement) === "HTMLImageElement") {
-          // The image is blocked by Tap-to-load Images
-          if (
-            aElement.hasAttribute("data-ctv-src") &&
-            !aElement.hasAttribute("data-ctv-show")
-          ) {
-            return false;
-          }
-        }
-        return (
-          aElement instanceof Ci.nsIImageLoadingContent && aElement.currentURI
-        );
-      },
-    },
-
-    imageSaveableContext: {
-      matches: function imageSaveableContextMatches(aElement) {
-        if (ChromeUtils.getClassName(aElement) === "HTMLImageElement") {
-          // The image is blocked by Tap-to-load Images
-          if (
-            aElement.hasAttribute("data-ctv-src") &&
-            !aElement.hasAttribute("data-ctv-show")
-          ) {
-            return false;
-          }
-        }
-        if (
-          aElement instanceof Ci.nsIImageLoadingContent &&
-          aElement.currentURI
-        ) {
-          // The image must be loaded to allow saving
-          let request = aElement.getRequest(
-            Ci.nsIImageLoadingContent.CURRENT_REQUEST
-          );
-          return request && request.imageStatus & request.STATUS_SIZE_AVAILABLE;
-        }
-        return false;
-      },
-    },
-
-    imageShareableContext: {
-      matches: aElement => {
-        let imgSrc = "";
-        if (ChromeUtils.getClassName(aElement) === "HTMLImageElement") {
-          imgSrc = aElement.src;
-        } else if (
-          aElement instanceof Ci.nsIImageLoadingContent &&
-          aElement.currentURI &&
-          aElement.currentURI.spec
-        ) {
-          imgSrc = aElement.currentURI.spec;
-        }
-
-        // In order to share an image, we need to pass the image src over IPC via an Intent (in
-        // `ApplicationPackageManager.queryIntentActivities`). However, the transaction has a 1MB limit
-        // (shared by all transactions in progress) - otherwise we crash! (bug 1243305)
-        //   https://developer.android.com/reference/android/os/TransactionTooLargeException.html
-        //
-        // The transaction limit is 1MB and we arbitrarily choose to cap this transaction at 1/4 of that = 250,000 bytes.
-        // In Java, a UTF-8 character is 1-4 bytes so, 250,000 bytes / 4 bytes/char = 62,500 char
-        let MAX_IMG_SRC_LEN = 62500;
-        let isTooLong = imgSrc.length >= MAX_IMG_SRC_LEN;
-        return (
-          !isTooLong &&
-          this.NativeWindow.contextmenus.imageSaveableContext.matches(aElement)
-        );
-      },
-    },
-
-    mediaSaveableContext: {
-      matches: function mediaSaveableContextMatches(aElement) {
-        return (
-          aElement instanceof HTMLVideoElement ||
-          aElement instanceof HTMLAudioElement
-        );
-      },
-    },
-
-    imageBlockingPolicyContext: {
-      matches: function imageBlockingPolicyContextMatches(aElement) {
-        if (
-          ChromeUtils.getClassName(aElement) === "HTMLImageElement" &&
-          aElement.getAttribute("data-ctv-src")
-        ) {
-          // Only show the menuitem if we are blocking the image
-          if (aElement.getAttribute("data-ctv-show") == "true") {
-            return false;
-          }
-          return true;
-        }
-        return false;
-      },
-    },
-
-    mediaContext: function(aMode) {
-      return {
-        matches: function(aElt) {
-          if (
-            ChromeUtils.getClassName(aElt) === "HTMLVideoElement" ||
-            ChromeUtils.getClassName(aElt) === "HTMLAudioElement"
-          ) {
-            let hasError =
-              aElt.error != null || aElt.networkState == aElt.NETWORK_NO_SOURCE;
-            if (hasError) {
-              return false;
-            }
-
-            let paused = aElt.paused || aElt.ended;
-            if (paused && aMode == "media-paused") {
-              return true;
-            }
-            if (!paused && aMode == "media-playing") {
-              return true;
-            }
-            let controls = aElt.controls;
-            if (!controls && aMode == "media-hidingcontrols") {
-              return true;
-            }
-
-            let muted = aElt.muted;
-            if (muted && aMode == "media-muted") {
-              return true;
-            } else if (!muted && aMode == "media-unmuted") {
-              return true;
-            }
-          }
-          return false;
-        },
-      };
-    },
-
-    videoContext: function(aMode) {
-      return {
-        matches: function(aElt) {
-          if (aElt instanceof HTMLVideoElement) {
-            if (!aMode) {
-              return true;
-            }
-            var isFullscreen = aElt.ownerDocument.fullscreenElement == aElt;
-            if (aMode == "not-fullscreen") {
-              return !isFullscreen;
-            }
-            if (aMode == "fullscreen") {
-              return isFullscreen;
-            }
-          }
-          return false;
-        },
-      };
-    },
-
-    /* Holds a WeakRef to the original target element this context menu was shown for.
-     * Most API's will have to walk up the tree from this node to find the correct element
-     * to act on
-     */
-    get _target() {
-      if (this._targetRef) {
-        return this._targetRef.get();
-      }
-      return null;
-    },
-
-    set _target(aTarget) {
-      if (aTarget) {
-        this._targetRef = Cu.getWeakReference(aTarget);
-      } else {
-        this._targetRef = null;
-      }
-    },
-
-    get defaultContext() {
-      delete this.defaultContext;
-      return (this.defaultContext = Strings.browser.GetStringFromName(
-        "browser.menu.context.default"
-      ));
-    },
-
-    get nonLinkContext() {
-      return "";
-    },
-
-    /* Gets menuitems for an arbitrary node
-     * Parameters:
-     *   element - The element to look at. If this element has a contextmenu attribute, the
-     *             corresponding contextmenu will be used.
-     */
-    _getHTMLContextMenuItemsForElement: function(element) {
-      let htmlMenu = element.contextMenu;
-      if (!htmlMenu) {
-        return [];
-      }
-
-      htmlMenu.sendShowEvent();
-
-      return this._getHTMLContextMenuItemsForMenu(htmlMenu, element);
-    },
-
-    /* Add a menuitem for an HTML <menu> node
-     * Parameters:
-     *   menu - The <menu> element to iterate through for menuitems
-     *   target - The target element these context menu items are attached to
-     */
-    _getHTMLContextMenuItemsForMenu: function(menu, target) {
-      let items = [];
-      for (let i = 0; i < menu.childNodes.length; i++) {
-        let elt = menu.childNodes[i];
-        if (!elt.label) {
-          continue;
-        }
-
-        items.push(new HTMLContextMenuItem(elt, target));
-      }
-
-      return items;
-    },
-
-    // Searches the current list of menuitems to show for any that match this id
-    _findMenuItem: function(aId) {
-      if (!this.menus) {
-        return null;
-      }
-
-      for (let context in this.menus) {
-        let menu = this.menus[context];
-        for (let i = 0; i < menu.length; i++) {
-          if (menu[i].id === aId) {
-            return menu[i];
-          }
-        }
-      }
-      return null;
-    },
-
-    // Returns true if there are any context menu items to show
-    _shouldShow: function() {
-      for (let context in this.menus) {
-        let menu = this.menus[context];
-        if (menu.length > 0) {
-          return true;
-        }
-      }
-      return false;
-    },
-
-    // Returns true if there are any link-related context menu items
-    _shouldPreventDefault: function() {
-      for (let context in this.menus) {
-        if (context === this.nonLinkContext) {
-          continue;
-        }
-        let menu = this.menus[context];
-        if (menu.length > 0) {
-          return true;
-        }
-      }
-      return false;
-    },
-
-    /* Returns a label to be shown in a tabbed ui if there are multiple "contexts". For instance, if this
-     * is an image inside an <a> tag, we may have a "link" context and an "image" one.
-     */
-    _getContextType: function(element) {
-      // For anchor nodes, we try to use the scheme to pick a string
-      if (ChromeUtils.getClassName(element) === "HTMLAnchorElement") {
-        try {
-          let uri = this.makeURI(this._getLinkURL(element));
-          return Strings.browser.GetStringFromName(
-            "browser.menu.context." + uri.scheme
-          );
-        } catch (ex) {
-          // Fallback to the default
-          return this.defaultContext;
-        }
-      }
-
-      // Otherwise we try the nodeName
-      try {
-        return Strings.browser.GetStringFromName(
-          "browser.menu.context." + element.nodeName.toLowerCase()
-        );
-      } catch (ex) {}
-
-      return this.nonLinkContext;
-    },
-
-    // Adds context menu items added through the add-on api
-    _getNativeContextMenuItems: function(element, x, y) {
-      let res = [];
-      for (let itemId of Object.keys(this.items)) {
-        let item = this.items[itemId];
-
-        if (!this._findMenuItem(item.id) && item.matches(element, x, y)) {
-          res.push(item);
-        }
-      }
-
-      return res;
-    },
-
-    /* Checks if there are context menu items to show, and if it finds them
-     * sends a contextmenu event to content. We also send showing events to
-     * any html5 context menus we are about to show, and fire some local notifications
-     * for chrome consumers to do lazy menuitem construction
-     */
-    show: function(event) {
-      // Android Long-press / contextmenu event provides clientX/Y data. This is not provided
-      // by mochitest: test_browserElement_inproc_ContextmenuEvents.html.
-      if (!event.clientX || !event.clientY) {
-        return;
-      }
-
-      // If the event was already defaultPrevented by somebody (web content, or
-      // some other part of gecko), then don't do anything with it.
-      if (event.defaultPrevented) {
-        return;
-      }
-
-      // Use the highlighted element for the context menu target. When accessibility is
-      // enabled, elements may not be highlighted so use the event target instead.
-      this._target =
-        BrowserEventHandler._highlightElement || event.composedTarget;
-      if (!this._target) {
-        return;
-      }
-
-      // Find the HTMLMediaElement host if the element is inside video controls UA Widget.
-      this._target = this._findMediaElementHostFromControls(this._target);
-
-      // Try to build a list of contextmenu items. If successful, actually show the
-      // native context menu by passing the list to Java.
-      this._buildMenu(event.clientX, event.clientY);
-      if (this._shouldShow()) {
-        BrowserEventHandler._cancelTapHighlight();
-
-        if (this._shouldPreventDefault()) {
-          // Consume / preventDefault the event.
-          event.preventDefault();
-        }
-        this._innerShow(this._target, event.clientX, event.clientY);
-        this._target = null;
-
-        return;
-      }
-
-      // If no context-menu for long-press event, it may be meant to trigger text-selection.
-      this.menus = null;
-      Services.obs.notifyObservers(
-        { target: this._target, x: event.clientX, y: event.clientY },
-        "context-menu-not-shown"
-      );
-    },
-
-    // Returns a title for a context menu. If no title attribute exists, will fall back to looking for a url
-    _getTitle: function(node) {
-      if (node.hasAttribute && node.hasAttribute("title")) {
-        return node.getAttribute("title");
-      }
-      let url = this._getUrl(node);
-      let readerUrl = ReaderMode.getOriginalUrlObjectForDisplay(url);
-
-      return (readerUrl && readerUrl.displaySpec) || url;
-    },
-
-    // Returns a url associated with a node
-    _getUrl: function(node) {
-      if (
-        (ChromeUtils.getClassName(node) === "HTMLAnchorElement" && node.href) ||
-        (ChromeUtils.getClassName(node) === "HTMLAreaElement" && node.href)
-      ) {
-        return this._getLinkURL(node);
-      } else if (node instanceof Ci.nsIImageLoadingContent && node.currentURI) {
-        // The image is blocked by Tap-to-load Images
-        let originalURL = node.getAttribute("data-ctv-src");
-        if (originalURL) {
-          return originalURL;
-        }
-        return node.currentURI.displaySpec;
-      } else if (
-        ChromeUtils.getClassName(node) === "HTMLVideoElement" ||
-        ChromeUtils.getClassName(node) === "HTMLAudioElement"
-      ) {
-        let srcUrl = node.currentSrc || node.src;
-        // If URL prepended with blob or mediasource, we'll remove it.
-        return srcUrl.replace(/^(?:blob|mediasource):/, "");
-      }
-
-      return "";
-    },
-
-    // Adds an array of menuitems to the current list of items to show, in the correct context
-    _addMenuItems: function(items, context) {
-      if (!this.menus[context]) {
-        this.menus[context] = [];
-      }
-      this.menus[context] = this.menus[context].concat(items);
-    },
-
-    _findMediaElementHostFromControls(element) {
-      if (!(element instanceof HTMLMediaElement)) {
-        let n = element;
-        while (n) {
-          if (n instanceof ShadowRoot) {
-            if (n.host instanceof HTMLMediaElement) {
-              // Node is a UA Widget Shadow Root with HTMLMediaElement as host
-              return n.host;
-            }
-            // Node is a normal Shadow Root, give up
-            return element;
-          }
-          // Set the node to its parentNode and continue the loop.
-          n = n.parentNode;
-        }
-      }
-      // Return the element given that the loop ends without finding anything,
-      // or because the element is already an HTMLMediaElement.
-      return element;
-    },
-
-    /* Does the basic work of building a context menu to show. Will combine HTML and Native
-     * context menus items, as well as sorting menuitems into different menus based on context.
-     */
-    _buildMenu: function(x, y) {
-      // now walk up the tree and for each node look for any context menu items that apply
-      let element = this._target;
-
-      // this.menus holds a hashmap of "contexts" to menuitems associated with that context
-      // For instance, if the user taps an image inside a link, we'll have something like:
-      // {
-      //   link:  [ ContextMenuItem, ContextMenuItem ]
-      //   image: [ ContextMenuItem, ContextMenuItem ]
-      // }
-      this.menus = {};
-
-      while (element) {
-        let context = this._getContextType(element);
-
-        // First check for any html5 context menus that might exist...
-        var items = this._getHTMLContextMenuItemsForElement(element);
-        if (items.length > 0) {
-          this._addMenuItems(items, context);
-        }
-
-        // then check for any context menu items registered in the ui.
-        items = this._getNativeContextMenuItems(element, x, y);
-        if (items.length > 0) {
-          this._addMenuItems(items, context);
-        }
-
-        // walk up the tree and find more items to show
-        element = element.parentNode;
-      }
-    },
-
-    // Walks the DOM tree to find a title from a node
-    _findTitle: function(node) {
-      let title = "";
-      while (node && !title) {
-        title = this._getTitle(node);
-        node = node.parentNode;
-      }
-      return title;
-    },
-
-    /* Reformats the list of menus to show into an object that can be sent to Prompt.jsm
-     * If there is one menu, will return a flat array of menuitems. If there are multiple
-     * menus, will return an array with appropriate tabs/items inside it. i.e. :
-     * [
-     *    { label: "link", items: [...] },
-     *    { label: "image", items: [...] }
-     * ]
-     */
-    _reformatList: function(target) {
-      let contexts = Object.keys(this.menus);
-
-      if (contexts.length === 1) {
-        // If there's only one context, we'll only show a single flat single select list
-        return this._reformatMenuItems(target, this.menus[contexts[0]]);
-      }
-
-      // If there are multiple contexts, we'll only show a tabbed ui with multiple lists
-      return this._reformatListAsTabs(target, this.menus);
-    },
-
-    /* Reformats the list of menus to show into an object that can be sent to Prompt.jsm's
-     * addTabs method. i.e. :
-     * { link: [...], image: [...] } becomes
-     * [ { label: "link", items: [...] } ]
-     *
-     * Also reformats items and resolves any parmaeters that aren't known until display time
-     * (for instance Helper app menu items adjust their title to reflect what Helper App can be used for this link).
-     */
-    _reformatListAsTabs: function(target, menus) {
-      let itemArray = [];
-
-      // Sort the keys so that "link" is always first
-      let contexts = Object.keys(this.menus);
-      contexts.sort((context1, context2) => {
-        if (context1 === this.defaultContext) {
-          return -1;
-        } else if (context2 === this.defaultContext) {
-          return 1;
-        }
-        return 0;
-      });
-
-      contexts.forEach(context => {
-        itemArray.push({
-          label: context,
-          items: this._reformatMenuItems(target, menus[context]),
-        });
-      });
-
-      return itemArray;
-    },
-
-    /* Reformats an array of ContextMenuItems into an array that can be handled by Prompt.jsm. Also reformats items
-     * and resolves any parmaeters that aren't known until display time
-     * (for instance Helper app menu items adjust their title to reflect what Helper App can be used for this link).
-     */
-    _reformatMenuItems: function(target, menuitems) {
-      let itemArray = [];
-
-      for (let i = 0; i < menuitems.length; i++) {
-        let t = target;
-        while (t) {
-          if (menuitems[i].matches(t)) {
-            let val = menuitems[i].getValue(t);
-
-            // hidden menu items will return null from getValue
-            if (val) {
-              itemArray.push(val);
-              break;
-            }
-          }
-
-          t = t.parentNode;
-        }
-      }
-
-      return itemArray;
-    },
-
-    // Called where we're finally ready to actually show the contextmenu. Sorts the items and shows a prompt.
-    _innerShow: function(target, x, y) {
-      Haptic.performSimpleAction(Haptic.LongPress);
-
-      // spin through the tree looking for a title for this context menu
-      let title = this._findTitle(target);
-
-      for (let context in this.menus) {
-        let menu = this.menus[context];
-        menu.sort((a, b) => {
-          if (a.order === b.order) {
-            return 0;
-          }
-          return a.order > b.order ? 1 : -1;
-        });
-      }
-
-      let useTabs = Object.keys(this.menus).length > 1;
-      let prompt = new Prompt({
-        window: target.ownerGlobal,
-        title: useTabs ? undefined : title,
-      });
-
-      let items = this._reformatList(target);
-      if (useTabs) {
-        prompt.addTabs({
-          id: "tabs",
-          items: items,
-        });
-      } else {
-        prompt.setSingleChoiceItems(items);
-      }
-
-      prompt.show(this._promptDone.bind(this, target, x, y, items));
-    },
-
-    // Called when the contextmenu prompt is closed
-    _promptDone: function(target, x, y, items, data) {
-      if (data.button == -1) {
-        // Prompt was cancelled, or an ActionView was used.
-        return;
-      }
-
-      let selectedItemId;
-      if (data.tabs) {
-        let menu = items[data.tabs.tab];
-        selectedItemId = menu.items[data.tabs.item].id;
-      } else {
-        selectedItemId = items[data.list[0]].id;
-      }
-
-      let selectedItem = this._findMenuItem(selectedItemId);
-      this.menus = null;
-
-      if (!selectedItem || !selectedItem.matches || !selectedItem.callback) {
-        return;
-      }
-
-      // for menuitems added using the native UI, pass the dom element that matched that item to the callback
-      while (target) {
-        if (selectedItem.matches(target, x, y)) {
-          selectedItem.callback(target, x, y);
-          break;
-        }
-        target = target.parentNode;
-      }
-    },
-
-    // XXX - These are stolen from Util.js, we should remove them if we bring it back
-    makeURLAbsolute: function makeURLAbsolute(base, url) {
-      // Note:  makeURI() will throw if url is not a valid URI
-      return this.makeURI(url, null, this.makeURI(base)).displaySpec;
-    },
-
-    makeURI: function makeURI(aURL, aOriginCharset, aBaseURI) {
-      return Services.io.newURI(aURL, aOriginCharset, aBaseURI);
-    },
-
-    _getLink: function(aElement) {
-      if (
-        aElement.nodeType == aElement.ELEMENT_NODE &&
-        ((ChromeUtils.getClassName(aElement) === "HTMLAnchorElement" &&
-          aElement.href) ||
-          (ChromeUtils.getClassName(aElement) === "HTMLAreaElement" &&
-            aElement.href) ||
-          ChromeUtils.getClassName(aElement) === "HTMLLinkElement" ||
-          aElement.getAttributeNS(kXLinkNamespace, "type") == "simple")
-      ) {
-        try {
-          let url = this._getLinkURL(aElement);
-          return Services.io.newURI(url);
-        } catch (e) {}
-      }
-      return null;
-    },
-
-    _disableRestricted: function _disableRestricted(restriction, selector) {
-      return {
-        matches: function _disableRestrictedMatches(aElement, aX, aY) {
-          if (!ParentalControls.isAllowed(ParentalControls[restriction])) {
-            return false;
-          }
-
-          return selector.matches(aElement, aX, aY);
-        },
-      };
-    },
-
-    _getLinkURL: function ch_getLinkURL(aLink) {
-      let href = aLink.href;
-      if (href) {
-        return this.makeURI(href).displaySpec;
-      }
-
-      href =
-        aLink.getAttribute("href") ||
-        aLink.getAttributeNS(kXLinkNamespace, "href");
-      if (!href || !href.match(/\S/)) {
-        // Without this we try to save as the current doc,
-        // for example, HTML case also throws if empty
-        throw new Error("Empty href");
-      }
-
-      return this.makeURLAbsolute(aLink.baseURI, href);
-    },
-
-    _copyStringToDefaultClipboard: function(aString) {
-      let clipboard = Cc["@mozilla.org/widget/clipboardhelper;1"].getService(
-        Ci.nsIClipboardHelper
-      );
-      clipboard.copyString(aString);
-      Snackbars.show(
-        Strings.browser.GetStringFromName("selectionHelper.textCopied"),
-        Snackbars.LENGTH_LONG
-      );
-    },
-
-    _stripScheme: function(aString) {
-      let index = aString.indexOf(":");
-      return aString.slice(index + 1);
-    },
-
-    _stripViewSource: function(aString) {
-      // If we're in a view source tab, remove the view-source: prefix
-      return aString.replace(/^view-source:/, "");
-    },
-  },
-};
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "PageActions",
-  "resource://gre/modules/PageActions.jsm"
-);
-
-// These alias to the old, deprecated NativeWindow interfaces
-[
-  ["pageactions", "resource://gre/modules/PageActions.jsm", "PageActions"],
-  ["toast", "resource://gre/modules/Snackbars.jsm", "Snackbars"],
-].forEach(item => {
-  let [name, script, exprt] = item;
-
-  XPCOMUtils.defineLazyGetter(NativeWindow, name, () => {
-    var err = Strings.browser.formatStringFromName("nativeWindow.deprecated", [
-      "NativeWindow." + name,
-      script,
-    ]);
-    Cu.reportError(err);
-
-    let sandbox = {};
-    ChromeUtils.import(script, sandbox);
-    return sandbox[exprt];
-  });
-});
-
-var LightWeightThemeStuff = {
-  init: function sh_init() {
-    ChromeUtils.defineModuleGetter(
-      this,
-      "LightweightThemeManager",
-      "resource://gre/modules/LightweightThemeManager.jsm"
-    );
-
-    if (
-      ParentalControls.parentalControlsEnabled &&
-      ParentalControls.isAllowed(ParentalControls.DEFAULT_THEME)
-    ) {
-      // We are using the DEFAULT_THEME restriction to differentiate between restricted profiles & guest mode - Bug 1199596
-      let { theme } = this.LightweightThemeManager.themeData;
-      if (!theme || theme.id == "default-theme@mozilla.org") {
-        this._installParentalControlsTheme();
-      }
-    }
-
-    let { LightweightThemeConsumer } = ChromeUtils.import(
-      "resource://gre/modules/LightweightThemeConsumer.jsm"
-    );
-    new LightweightThemeConsumer(document);
-  },
-
-  _installParentalControlsTheme: function() {
-    this.LightweightThemeManager.fallbackThemeData = {
-      theme: {
-        headerURL: "resource://android/assets/parental_controls_theme.png",
-        name: "Parental Controls Theme",
-        id: "parental-controls-theme@mozilla.org",
-      },
-    };
-  },
-};
-
-function nsBrowserAccess() {}
-
-nsBrowserAccess.prototype = {
-  QueryInterface: ChromeUtils.generateQI([Ci.nsIBrowserDOMWindow]),
-
-  // eslint-disable-next-line complexity
-  _getBrowser: function _getBrowser(
-    aURI,
-    aOpener,
-    aWhere,
-    aFlags,
-    aTriggeringPrincipal,
-    aCsp
-  ) {
-    let isExternal = !!(aFlags & Ci.nsIBrowserDOMWindow.OPEN_EXTERNAL);
-    if (isExternal && aURI && aURI.schemeIs("chrome")) {
-      return null;
-    }
-
-    let loadflags = isExternal
-      ? Ci.nsIWebNavigation.LOAD_FLAGS_FROM_EXTERNAL
-      : Ci.nsIWebNavigation.LOAD_FLAGS_NONE;
-    if (aWhere == Ci.nsIBrowserDOMWindow.OPEN_DEFAULTWINDOW) {
-      if (isExternal) {
-        aWhere = Services.prefs.getIntPref("browser.link.open_external");
-      } else {
-        aWhere = Services.prefs.getIntPref("browser.link.open_newwindow");
-      }
-    }
-
-    Services.io.offline = false;
-
-    let referrer;
-    let forceNoReferrer = !!(aFlags & Ci.nsIBrowserDOMWindow.OPEN_NO_REFERRER);
-    if (aOpener) {
-      try {
-        let location = aOpener.location;
-        referrer = forceNoReferrer ? null : Services.io.newURI(location);
-      } catch (e) {}
-    }
-
-    let ss = Cc["@mozilla.org/browser/sessionstore;1"].getService(
-      Ci.nsISessionStore
-    );
-    let pinned = false;
-
-    if (aURI && aWhere == Ci.nsIBrowserDOMWindow.OPEN_SWITCHTAB) {
-      pinned = true;
-      let spec = aURI.displaySpec;
-      let tabs = BrowserApp.tabs;
-      for (let i = 0; i < tabs.length; i++) {
-        let appOrigin = ss.getTabValue(tabs[i], "appOrigin");
-        if (appOrigin == spec) {
-          let tab = tabs[i];
-          BrowserApp.selectTab(tab);
-          return tab.browser;
-        }
-      }
-    }
-
-    // If OPEN_SWITCHTAB was not handled above, we need to open a new tab,
-    // along with other OPEN_ values that create a new tab.
-    let newTab =
-      aWhere == Ci.nsIBrowserDOMWindow.OPEN_NEWWINDOW ||
-      aWhere == Ci.nsIBrowserDOMWindow.OPEN_NEWTAB ||
-      aWhere == Ci.nsIBrowserDOMWindow.OPEN_SWITCHTAB;
-    let isPrivate = false;
-
-    if (newTab) {
-      let parentId = -1;
-      if (!isExternal && aOpener) {
-        let parent = BrowserApp.getTabForWindow(aOpener.top);
-        if (parent) {
-          parentId = parent.id;
-          isPrivate = PrivateBrowsingUtils.isBrowserPrivate(parent.browser);
-        }
-      }
-
-      let openerWindow =
-        aFlags & Ci.nsIBrowserDOMWindow.OPEN_NO_OPENER ? null : aOpener;
-      // BrowserApp.addTab calls loadURI with the appropriate params
-      let tab = BrowserApp.addTab(aURI ? aURI.spec : "about:blank", {
-        flags: loadflags,
-        referrerURI: referrer,
-        external: isExternal,
-        parentId: parentId,
-        opener: openerWindow,
-        selected: true,
-        isPrivate: isPrivate,
-        pinned: pinned,
-        triggeringPrincipal: aTriggeringPrincipal,
-        csp: aCsp,
-      });
-
-      return tab.browser;
-    }
-
-    // OPEN_CURRENTWINDOW and illegal values
-    let browser = BrowserApp.selectedBrowser;
-    if (aURI && browser) {
-      browser.loadURI(aURI.spec, {
-        flags: loadflags,
-        referrerInfo: createReferrerInfo(referrer),
-        triggeringPrincipal: aTriggeringPrincipal,
-      });
-    }
-
-    return browser;
-  },
-
-  openURI: function browser_openURI(
-    aURI,
-    aOpener,
-    aWhere,
-    aFlags,
-    aTriggeringPrincipal,
-    aCsp
-  ) {
-    if (!aURI) {
-      throw new Error("Can't open an empty uri");
-    }
-    let browser = this._getBrowser(
-      aURI,
-      aOpener,
-      aWhere,
-      aFlags,
-      aTriggeringPrincipal,
-      aCsp
-    );
-    return browser && browser.browsingContext;
-  },
-
-  createContentWindow: function browser_createContentWindow(
-    aURI,
-    aOpener,
-    aWhere,
-    aFlags,
-    aTriggeringPrincipal,
-    aCsp
-  ) {
-    let browser = this._getBrowser(
-      null,
-      aOpener,
-      aWhere,
-      aFlags,
-      aTriggeringPrincipal,
-      aCsp
-    );
-    return browser && browser.browsingContext;
-  },
-
-  openURIInFrame: function browser_openURIInFrame(
-    aURI,
-    aParams,
-    aWhere,
-    aFlags,
-    aNextRemoteTabId,
-    aName
-  ) {
-    // We currently ignore aNextRemoteTabId on mobile.  This needs to change
-    // when Fennec starts to support e10s.  Assertions will fire if this code
-    // isn't fixed by then.
-    //
-    // We also ignore aName if it is set, as it is currently only used on the
-    // e10s codepath.
-    return this._getBrowser(aURI, null, aWhere, aFlags, null);
-  },
-
-  createContentWindowInFrame: function browser_createContentWindowInFrame(
-    aURI,
-    aParams,
-    aWhere,
-    aFlags,
-    aNextRemoteTabId,
-    aName
-  ) {
-    return this._getBrowser(null, null, aWhere, aFlags, null);
-  },
-
-  isTabContentWindow: function(aWindow) {
-    return BrowserApp.getBrowserForWindow(aWindow) != null;
-  },
-
-  canClose() {
-    return BrowserUtils.canCloseWindow(window);
-  },
-};
-
-function Tab(aURL, aParams) {
-  this.filter = null;
-  this.browser = null;
-  this.id = 0;
-  this._parentId = -1;
-  this.lastTouchedAt = Date.now();
-  this.contentDocumentIsDisplayed = true;
-  this.desktopMode = false;
-  this.originalURI = null;
-  this.hasTouchListener = false;
-  this.playingAudio = false;
-
-  this.create(aURL, aParams);
-}
-
-/*
- * Sanity limit for URIs passed to UI code.
- *
- * 2000 is the typical industry limit, largely due to older IE versions.
- *
- * We use 25000, so we'll allow almost any value through.
- *
- * Still, this truncation doesn't affect history, so this is only a practical
- * concern in two ways: the truncated value is used when editing URIs, and as
- * the key for favicon fetches.
- */
-const MAX_URI_LENGTH = 25000;
-
-/*
- * Similar restriction for titles. This is only a display concern.
- */
-const MAX_TITLE_LENGTH = 255;
-
-/**
- * Ensure that a string is of a sane length.
- */
-function truncate(text, max) {
-  if (!text || !max) {
-    return text;
-  }
-
-  if (text.length <= max) {
-    return text;
-  }
-
-  return text.slice(0, max) + "…";
-}
-
-/**
- * We want to extract base domains only from URIs using one of the following
- * schemes.
- */
-const PERMITTED_BASE_DOMAIN_SCHEMES = new Set(["http", "https", "ftp"]);
-
-function getBaseDomain(aURI) {
-  let baseDomain = "";
-  if (aURI && PERMITTED_BASE_DOMAIN_SCHEMES.has(aURI.scheme)) {
-    try {
-      baseDomain = Services.eTLD.getBaseDomainFromHost(aURI.displayHost);
-      if (!aURI.displayHost.endsWith(baseDomain)) {
-        // getBaseDomainFromHost converts its resultant to ACE.
-        let IDNService = Cc["@mozilla.org/network/idn-service;1"].getService(
-          Ci.nsIIDNService
-        );
-        baseDomain = IDNService.convertACEtoUTF8(baseDomain);
-      }
-    } catch (e) {}
-  }
-  return baseDomain;
-}
-
-Tab.prototype = {
-  // eslint-disable-next-line complexity
-  create: function(aURL, aParams) {
-    if (this.browser) {
-      return;
-    }
-
-    aParams = aParams || {};
-
-    this.browser = document.createXULElement("browser");
-    this.browser.setAttribute("type", "content");
-    this.browser.setAttribute("messagemanagergroup", "browsers");
-
-    if (Preferences.get("browser.tabs.remote.force-enable", false)) {
-      this.browser.setAttribute("remote", "true");
-    }
-
-    this.browser.permanentKey = {};
-
-    // Check if we have a "parent" window which we need to set as our opener
-    if ("opener" in aParams) {
-      this.browser.presetOpenerWindow(aParams.opener);
-    }
-
-    // Make sure the previously selected panel remains selected. The selected panel of a deck is
-    // not stable when panels are added.
-    let selectedPanel = BrowserApp.deck.selectedPanel;
-    BrowserApp.deck.appendChild(this.browser);
-    BrowserApp.deck.selectedPanel = selectedPanel;
-
-    let attrs = {};
-
-    // Must be called after appendChild so the docShell has been created.
-    this.setActive(false);
-
-    let isPrivate = "isPrivate" in aParams && aParams.isPrivate;
-    if (isPrivate) {
-      attrs.privateBrowsingId = 1;
-    }
-
-    this.browser.docShell.setOriginAttributes(attrs);
-
-    let desktopMode = "desktopMode" in aParams ? aParams.desktopMode : false;
-    if (desktopMode) {
-      this.browser.docShell.customUserAgent = DESKTOP_UA;
-    } else {
-      this.browser.docShell.customUserAgent = "";
-    }
-
-    // Set the new docShell load flags based on network state.
-    if (Tabs.useCache) {
-      this.browser.docShell.defaultLoadFlags |= Ci.nsIRequest.LOAD_FROM_CACHE;
-    }
-
-    this.browser.stop();
-
-    // Only set tab uri if uri is valid
-    let uri = null;
-    let title = aParams.title || aURL;
-    try {
-      uri = Services.io.newURI(aURL).displaySpec;
-    } catch (e) {}
-
-    // When the tab is stubbed from Java, there's a window between the stub
-    // creation and the tab creation in Gecko where the stub could be removed
-    // or the selected tab can change (which is easiest to hit during startup).
-    // To prevent these races, we need to differentiate between tab stubs from
-    // Java and new tabs from Gecko.
-    let stub = false;
-
-    if (!aParams.zombifying) {
-      if ("tabID" in aParams) {
-        this.id = aParams.tabID;
-        stub = true;
-      } else {
-        // Send a synchronous Gecko thread event.
-        GlobalEventDispatcher.dispatch("Tab:GetNextTabId", null, {
-          onSuccess: response => (this.id = response),
-        });
-      }
-
-      this.desktopMode = "desktopMode" in aParams ? aParams.desktopMode : false;
-      this._parentId =
-        "parentId" in aParams && typeof aParams.parentId == "number"
-          ? aParams.parentId
-          : -1;
-
-      let message = {
-        type: "Tab:Added",
-        tabID: this.id,
-        uri: truncate(uri, MAX_URI_LENGTH),
-        parentId: this.parentId,
-        tabIndex: "tabIndex" in aParams ? aParams.tabIndex : -1,
-        external: "external" in aParams ? aParams.external : false,
-        selected:
-          "selected" in aParams || aParams.cancelEditMode === true
-            ? aParams.selected !== false || aParams.cancelEditMode === true
-            : true,
-        cancelEditMode: aParams.cancelEditMode === true,
-        title: truncate(title, MAX_TITLE_LENGTH),
-        delayLoad: aParams.delayLoad || false,
-        desktopMode: this.desktopMode,
-        isPrivate: isPrivate,
-        stub: stub,
-      };
-      GlobalEventDispatcher.sendRequest(message);
-    }
-    this.browser.contentWindow.windowUtils.setDesktopModeViewport(
-      this.desktopMode
-    );
-
-    let flags =
-      Ci.nsIWebProgress.NOTIFY_STATE_ALL |
-      Ci.nsIWebProgress.NOTIFY_LOCATION |
-      Ci.nsIWebProgress.NOTIFY_SECURITY |
-      Ci.nsIWebProgress.NOTIFY_CONTENT_BLOCKING;
-    this.filter = Cc[
-      "@mozilla.org/appshell/component/browser-status-filter;1"
-    ].createInstance(Ci.nsIWebProgress);
-    this.filter.addProgressListener(this, flags);
-    this.browser.addProgressListener(this.filter, flags);
-    this.browser.sessionHistory.legacySHistory.addSHistoryListener(this);
-
-    this.browser.addEventListener("DOMContentLoaded", this, true);
-    this.browser.addEventListener("DOMFormHasPassword", this, true);
-    this.browser.addEventListener("DOMInputPasswordAdded", this, true);
-    this.browser.addEventListener("DOMLinkAdded", this, true);
-    this.browser.addEventListener("DOMLinkChanged", this, true);
-    this.browser.addEventListener("DOMMetaAdded", this);
-    this.browser.addEventListener("DOMTitleChanged", this, true);
-    this.browser.addEventListener("DOMAudioPlaybackStarted", this, true);
-    this.browser.addEventListener("DOMAudioPlaybackStopped", this, true);
-    this.browser.addEventListener("DOMWindowClose", this, true);
-    this.browser.addEventListener("DOMWillOpenModalDialog", this, true);
-    this.browser.addEventListener("pagehide", this, true);
-    this.browser.addEventListener("pageshow", this, true);
-    this.browser.addEventListener("TabPreZombify", this, true);
-    this.browser.addEventListener("framefocusrequested", this, true);
-    this.browser.addEventListener("focusin", this, true);
-    this.browser.addEventListener("focusout", this, true);
-    this.browser.addEventListener("TabSelect", this, true);
-
-    // Note that the XBL binding is untrusted
-    this.browser.addEventListener("VideoBindingAttached", this, true, true);
-    this.browser.addEventListener("VideoBindingCast", this, true, true);
-
-    Services.obs.addObserver(this, "audioFocusChanged");
-    Services.obs.addObserver(this, "before-first-paint");
-    Services.obs.addObserver(this, "media-playback");
-
-    XPCOMUtils.defineLazyGetter(
-      this,
-      "_autoFill",
-      () => new GeckoViewAutofill(WindowEventDispatcher)
-    );
-
-    // Always initialise new tabs with basic session store data to avoid
-    // problems with functions that always expect it to be present
-    let triggeringPrincipal_base64 = aParams.triggeringPrincipal
-      ? E10SUtils.serializePrincipal(aParams.triggeringPrincipal)
-      : E10SUtils.SERIALIZED_SYSTEMPRINCIPAL;
-    this.browser.__SS_data = {
-      entries: [
-        {
-          url: uri,
-          title: truncate(title, MAX_TITLE_LENGTH),
-          triggeringPrincipal_base64,
-        },
-      ],
-      index: 1,
-      desktopMode: this.desktopMode,
-      isPrivate: isPrivate,
-      tabId: this.id,
-      parentId: this.parentId,
-    };
-
-    let pinned = "pinned" in aParams ? aParams.pinned : false;
-    if (pinned && uri) {
-      let ss = Cc["@mozilla.org/browser/sessionstore;1"].getService(
-        Ci.nsISessionStore
-      );
-      ss.setTabValue(this, "appOrigin", uri);
-    }
-
-    if (aParams.delayLoad) {
-      // If this is a zombie tab, mark the browser for delay loading, which will
-      // restore the tab when selected using the session data added above
-      this.browser.__SS_restore = true;
-      this.browser.setAttribute("pending", "true");
-    } else {
-      let flags =
-        "flags" in aParams
-          ? aParams.flags
-          : Ci.nsIWebNavigation.LOAD_FLAGS_NONE;
-      if (aParams.disallowInheritPrincipal) {
-        flags |= Ci.nsIWebNavigation.LOAD_FLAGS_DISALLOW_INHERIT_PRINCIPAL;
-      }
-
-      let postData =
-        "postData" in aParams && aParams.postData
-          ? aParams.postData.value
-          : null;
-      let referrerInfo =
-        "referrerURI" in aParams
-          ? createReferrerInfo(aParams.referrerURI)
-          : null;
-      let charset = "charset" in aParams ? aParams.charset : null;
-
-      // The search term the user entered to load the current URL
-      this.userRequested =
-        "userRequested" in aParams ? aParams.userRequested : "";
-      this.isSearch = "isSearch" in aParams ? aParams.isSearch : false;
-
-      try {
-        this.browser.loadURI(aURL, {
-          flags,
-          referrerInfo,
-          charset,
-          postData,
-          triggeringPrincipal: aParams.triggeringPrincipal,
-        });
-      } catch (e) {
-        let message = {
-          type: "Content:LoadError",
-          tabID: this.id,
-        };
-        GlobalEventDispatcher.sendRequest(message);
-        dump("Handled load error: " + e);
-      }
-    }
-  },
-
-  /**
-   * Reloads the tab with the desktop mode setting.
-   */
-  reloadWithMode: function(aDesktopMode) {
-    // notify desktopmode for PIDOMWindow
-    let win = this.browser.contentWindow;
-    let dwi = win.windowUtils;
-    dwi.setDesktopModeViewport(aDesktopMode);
-
-    // Set desktop mode for tab and send change to Java
-    if (this.desktopMode != aDesktopMode) {
-      this.desktopMode = aDesktopMode;
-      GlobalEventDispatcher.sendRequest({
-        type: "DesktopMode:Changed",
-        desktopMode: aDesktopMode,
-        tabID: this.id,
-      });
-    }
-
-    // Only reload the page for http/https schemes
-    let currentURI = this.browser.currentURI;
-    if (!currentURI.schemeIs("http") && !currentURI.schemeIs("https")) {
-      return;
-    }
-
-    let url = currentURI.spec;
-    // We need LOAD_FLAGS_BYPASS_CACHE here since we're changing the User-Agent
-    // string, and servers typically don't use the Vary: User-Agent header, so
-    // not doing this means that we'd get some of the previously cached content.
-    let loadFlags =
-      Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_CACHE |
-      Ci.nsIWebNavigation.LOAD_FLAGS_REPLACE_HISTORY;
-    if (this.originalURI && !this.originalURI.equals(currentURI)) {
-      // We were redirected; reload the original URL
-      url = this.originalURI.spec;
-    }
-
-    if (aDesktopMode) {
-      this.browser.docShell.customUserAgent = DESKTOP_UA;
-    } else {
-      // Clear custom UA
-      this.browser.docShell.customUserAgent = "";
-    }
-
-    let loadURIOptions = {
-      triggeringPrincipal: this.browser.contentPrincipal,
-      loadFlags,
-    };
-    this.browser.docShell.loadURI(url, loadURIOptions);
-  },
-
-  destroy: function() {
-    if (!this.browser) {
-      return;
-    }
-
-    this.browser.removeProgressListener(this.filter);
-    this.filter.removeProgressListener(this);
-    this.filter = null;
-    this.browser.sessionHistory.legacySHistory.removeSHistoryListener(this);
-
-    this.browser.removeEventListener("DOMContentLoaded", this, true);
-    this.browser.removeEventListener("DOMFormHasPassword", this, true);
-    this.browser.removeEventListener("DOMInputPasswordAdded", this, true);
-    this.browser.removeEventListener("DOMLinkAdded", this, true);
-    this.browser.removeEventListener("DOMLinkChanged", this, true);
-    this.browser.removeEventListener("DOMMetaAdded", this);
-    this.browser.removeEventListener("DOMTitleChanged", this, true);
-    this.browser.removeEventListener("DOMAudioPlaybackStarted", this, true);
-    this.browser.removeEventListener("DOMAudioPlaybackStopped", this, true);
-    this.browser.removeEventListener("DOMWindowClose", this, true);
-    this.browser.removeEventListener("DOMWillOpenModalDialog", this, true);
-    this.browser.removeEventListener("pagehide", this, true);
-    this.browser.removeEventListener("pageshow", this, true);
-    this.browser.removeEventListener("TabPreZombify", this, true);
-    this.browser.removeEventListener("framefocusrequested", this, true);
-    this.browser.removeEventListener("focusin", this, true);
-    this.browser.removeEventListener("focusout", this, true);
-    this.browser.removeEventListener("TabSelect", this, true);
-
-    this.browser.removeEventListener("VideoBindingAttached", this, true, true);
-    this.browser.removeEventListener("VideoBindingCast", this, true, true);
-
-    Services.obs.removeObserver(this, "audioFocusChanged");
-    Services.obs.removeObserver(this, "before-first-paint");
-    Services.obs.removeObserver(this, "media-playback");
-
-    // Make sure the previously selected panel remains selected. The selected panel of a deck is
-    // not stable when panels are removed.
-    let selectedPanel = BrowserApp.deck.selectedPanel;
-    BrowserApp.deck.removeChild(this.browser);
-    BrowserApp.deck.selectedPanel = selectedPanel;
-
-    this.browser = null;
-  },
-
-  // This should be called to update the browser when the tab gets selected/unselected
-  setActive: function setActive(aActive) {
-    if (!this.browser || !this.browser.docShell) {
-      return;
-    }
-
-    this.lastTouchedAt = Date.now();
-
-    if (aActive) {
-      this.browser.setAttribute("primary", "true");
-      this.browser.focus();
-      this.browser.docShellIsActive = true;
-      Reader.updatePageAction(this);
-      ExternalApps.updatePageAction(
-        this.browser.currentURI,
-        this.browser.contentDocument
-      );
-    } else {
-      this.browser.removeAttribute("primary");
-      this.browser.docShellIsActive = false;
-      this.browser.blur();
-    }
-  },
-
-  getActive: function getActive() {
-    return this.browser.docShellIsActive;
-  },
-
-  /**
-   * Unloads the tab from memory to free up resources. The tab will be restored from its session
-   * store data either automatically when it gets selected or after calling unzombify().
-   */
-  zombify: function zombify() {
-    let browser = this.browser;
-    let data = browser.__SS_data;
-    let extra = browser.__SS_extdata;
-
-    // Notify any interested parties (e.g. the session store)
-    // that the original tab object is going to be destroyed
-    let evt = new UIEvent("TabPreZombify", {
-      bubbles: true,
-      cancelable: false,
-      view: window,
-    });
-    browser.dispatchEvent(evt);
-
-    // We need this data to correctly create the new browser
-    // If this browser is already a zombie, fallback to the session data
-    let currentURL = browser.__SS_restore
-      ? data.entries[0].url
-      : browser.currentURI.spec;
-    let isPrivate = PrivateBrowsingUtils.isBrowserPrivate(browser);
-
-    this.destroy();
-    this.create(currentURL, {
-      zombifying: true,
-      delayLoad: true,
-      isPrivate: isPrivate,
-    });
-
-    // Reattach session store data and flag this browser so it is restored on select
-    browser = this.browser;
-    browser.__SS_data = data;
-    browser.__SS_extdata = extra;
-    browser.__SS_restore = true;
-    browser.setAttribute("pending", "true");
-
-    // Notify the session store to reattach its listeners to the recreated tab object
-    evt = new UIEvent("TabPostZombify", {
-      bubbles: true,
-      cancelable: false,
-      view: window,
-    });
-    browser.dispatchEvent(evt);
-  },
-
-  /**
-   * Restores the tab and reloads its contents if it is unloaded from memory and set for delay
-   * loading ("zombified").
-   */
-  unzombify: function unzombify() {
-    let ss = Cc["@mozilla.org/browser/sessionstore;1"].getService(
-      Ci.nsISessionStore
-    );
-    ss.restoreZombieTab(this);
-  },
-
-  // These constants are used to prioritize high quality metadata over low quality data, so that
-  // we can collect data as we find meta tags, and replace low quality metadata with higher quality
-  // matches. For instance a msApplicationTile icon is a better tile image than an og:image tag.
-  METADATA_GOOD_MATCH: 10,
-  METADATA_NORMAL_MATCH: 1,
-
-  addMetadata: function(type, value, quality = 1) {
-    if (!this.metatags) {
-      this.metatags = {
-        url: this.browser.currentURI.specIgnoringRef,
-      };
-    }
-
-    if (type == "touchIconList") {
-      if (!this.metatags.touchIconList) {
-        this.metatags.touchIconList = {};
-      }
-      this.metatags.touchIconList[quality] = value;
-    } else if (
-      !this.metatags[type] ||
-      this.metatags[type + "_quality"] < quality
-    ) {
-      this.metatags[type] = value;
-      this.metatags[type + "_quality"] = quality;
-    }
-  },
-
-  sanitizeRelString: function(linkRel) {
-    // Sanitize the rel string
-    let list = [];
-    if (linkRel) {
-      list = linkRel.toLowerCase().split(/\s+/);
-      let hash = {};
-      list.forEach(function(value) {
-        hash[value] = true;
-      });
-      list = [];
-      for (let rel in hash) {
-        list.push("[" + rel + "]");
-      }
-    }
-    return list;
-  },
-
-  makeFaviconMessage: function(eventTarget) {
-    // We want to get the largest icon size possible for our UI.
-    let maxSize = 0;
-
-    // We use the sizes attribute if available
-    // see http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#rel-icon
-    if (eventTarget.hasAttribute("sizes")) {
-      let sizes = eventTarget.getAttribute("sizes").toLowerCase();
-
-      if (sizes == "any") {
-        // Since Java expects an integer, use -1 to represent icons with sizes="any"
-        maxSize = -1;
-      } else {
-        let tokens = sizes.split(" ");
-        tokens.forEach(function(token) {
-          // TODO: check for invalid tokens
-          let [w, h] = token.split("x");
-          maxSize = Math.max(maxSize, Math.max(w, h));
-        });
-      }
-    }
-    return {
-      type: "Link:Favicon",
-      tabID: this.id,
-      href: resolveGeckoURI(eventTarget.href),
-      size: maxSize,
-      mime: eventTarget.getAttribute("type") || "",
-    };
-  },
-
-  makeFeedMessage: function(eventTarget, targetType) {
-    try {
-      // urlSecurityCeck will throw if things are not OK
-      ContentAreaUtils.urlSecurityCheck(
-        eventTarget.href,
-        eventTarget.ownerDocument.nodePrincipal,
-        Ci.nsIScriptSecurityManager.DISALLOW_INHERIT_PRINCIPAL
-      );
-
-      if (!this.browser.feeds) {
-        this.browser.feeds = [];
-      }
-
-      this.browser.feeds.push({
-        href: eventTarget.href,
-        title: eventTarget.title,
-        type: targetType,
-      });
-
-      return {
-        type: "Link:Feed",
-        tabID: this.id,
-      };
-    } catch (e) {
-      return null;
-    }
-  },
-
-  makeManifestMessage: async function(target) {
-    try {
-      const manifest = await Manifests.getManifest(this.browser, target.href);
-      const data = await manifest.prefetch(this.browser);
-      var cache = {
-        type: "Link:Manifest",
-        href: target.href,
-        manifest: JSON.stringify(data),
-        tabID: this.id,
-      };
-      GlobalEventDispatcher.sendRequest(cache);
-    } catch (err) {
-      Log.e("Browser", "error when makeManifestMessage:" + err);
-    }
-  },
-
-  sendOpenSearchMessage: async function(eventTarget) {
-    let type = eventTarget.type && eventTarget.type.toLowerCase();
-    // Replace all starting or trailing spaces or spaces before "*;" globally w/ "".
-    type = type.replace(/^\s+|\s*(?:;.*)?$/g, "");
-
-    // Check that type matches opensearch.
-    let isOpenSearch = type == "application/opensearchdescription+xml";
-    if (
-      isOpenSearch &&
-      eventTarget.title &&
-      /^(?:https?|ftp):/i.test(eventTarget.href)
-    ) {
-      let visibleEngines = await Services.search.getVisibleEngines();
-      // NOTE: Engines are currently identified by name, but this can be changed
-      // when Engines are identified by URL (see bug 335102).
-      if (
-        visibleEngines.some(function(e) {
-          return e.name == eventTarget.title;
-        })
-      ) {
-        // This engine is already present, do nothing.
-        return null;
-      }
-
-      if (this.browser.engines) {
-        // This engine has already been handled, do nothing.
-        if (
-          this.browser.engines.some(function(e) {
-            return e.url == eventTarget.href;
-          })
-        ) {
-          return null;
-        }
-      } else {
-        this.browser.engines = [];
-      }
-
-      // Get favicon.
-      let iconURL =
-        eventTarget.ownerDocument.documentURIObject.prePath + "/favicon.ico";
-
-      let newEngine = {
-        title: eventTarget.title,
-        url: eventTarget.href,
-        iconURL: iconURL,
-      };
-
-      this.browser.engines.push(newEngine);
-
-      // Don't send a message to display engines if we've already handled an engine.
-      if (this.browser.engines.length > 1) {
-        return null;
-      }
-
-      // Broadcast message that this tab contains search engines that should be visible.
-      GlobalEventDispatcher.sendRequest({
-        type: "Link:OpenSearch",
-        tabID: this.id,
-        visible: true,
-      });
-    }
-  },
-
-  get parentId() {
-    return this._parentId;
-  },
-
-  set parentId(aParentId) {
-    let newParentId = typeof aParentId == "number" ? aParentId : -1;
-    this._parentId = newParentId;
-    GlobalEventDispatcher.sendRequest({
-      type: "Tab:SetParentId",
-      tabID: this.id,
-      parentID: newParentId,
-    });
-  },
-
-  get currentURI() {
-    if (!this.browser.__SS_restore) {
-      return this.browser.currentURI;
-    }
-    // For zombie tabs we need to fall back to the session store data.
-    let data = this.browser.__SS_data;
-    let url = data.entries[data.index - 1].url;
-    return Services.io.newURI(url);
-  },
-
-  // eslint-disable-next-line complexity
-  handleEvent: function(aEvent) {
-    switch (aEvent.type) {
-      case "DOMContentLoaded": {
-        let target = aEvent.originalTarget;
-
-        // ignore on frames and other documents
-        if (target != this.browser.contentDocument) {
-          return;
-        }
-
-        let docURI = target.documentURI;
-        let errorType = "";
-        if (docURI.startsWith("about:certerror")) {
-          errorType = "certerror";
-        } else if (docURI.startsWith("about:blocked")) {
-          errorType = "blocked";
-        } else if (docURI.startsWith("about:neterror")) {
-          let error = docURI.search(/e\=/);
-          let duffUrl = docURI.search(/\&u\=/);
-          let errorExtra = decodeURIComponent(docURI.slice(error + 2, duffUrl));
-          // Here is a list of errorExtra types (et_*)
-          // http://mxr.mozilla.org/mozilla-central/source/mobile/android/chrome/content/netError.xhtml#287
-          if (errorExtra == "fileAccessDenied") {
-            // Check if we already have the permissions, then - if we do not have them, show the prompt and reload the page.
-            // If we already have them, it means access to file was denied.
-            RuntimePermissions.checkPermissions(
-              RuntimePermissions.READ_EXTERNAL_STORAGE
-            ).then(permissionAlreadyGranted => {
-              if (!permissionAlreadyGranted) {
-                RuntimePermissions.waitForPermissions(
-                  RuntimePermissions.READ_EXTERNAL_STORAGE
-                ).then(permissionGranted => {
-                  if (permissionGranted) {
-                    this.browser.reload();
-                  }
-                });
-              }
-            });
-          }
-
-          UITelemetry.addEvent("neterror.1", "content", null, errorExtra);
-          errorType = "neterror";
-        }
-
-        // Attach a listener to watch for "click" events bubbling up from error
-        // pages and other similar page. This lets us fix bugs like 401575 which
-        // require error page UI to do privileged things, without letting error
-        // pages have any privilege themselves.
-        if (docURI.startsWith("about:neterror")) {
-          NetErrorHelper.attachToBrowser(this.browser);
-        }
-
-        GlobalEventDispatcher.sendRequest({
-          type: "Content:DOMContentLoaded",
-          tabID: this.id,
-          errorType: errorType,
-          metadata: this.metatags,
-        });
-
-        this.metatags = null;
-
-        if (
-          docURI.startsWith("about:certerror") ||
-          docURI.startsWith("about:blocked")
-        ) {
-          this.browser.addEventListener("click", ErrorPageEventHandler, true);
-          let listener = () => {
-            this.browser.removeEventListener(
-              "click",
-              ErrorPageEventHandler,
-              true
-            );
-            this.browser.removeEventListener("pagehide", listener, true);
-          };
-
-          this.browser.addEventListener("pagehide", listener, true);
-        }
-
-        if (!docURI.startsWith("about:")) {
-          WebsiteMetadata.parseAsynchronously(this.browser.contentDocument);
-        }
-
-        break;
-      }
-
-      case "DOMFormHasPassword": {
-        // Send logins for this hostname to Java.
-        let hostname = aEvent.target.baseURIObject.displayPrePath;
-        let foundLogins = Services.logins.findLogins(hostname, "", "");
-        if (foundLogins.length > 0) {
-          let displayHost = IdentityHandler.getEffectiveHost();
-          let title = { text: displayHost, resource: hostname };
-          let selectObj = { title: title, logins: foundLogins };
-          GlobalEventDispatcher.sendRequest({
-            type: "Doorhanger:Logins",
-            data: selectObj,
-          });
-        }
-
-        this._autoFill.addElement(
-          FormLikeFactory.createFromForm(aEvent.composedTarget)
-        );
-        break;
-      }
-
-      case "DOMInputPasswordAdded": {
-        const input = aEvent.composedTarget;
-        if (!input.form) {
-          this._autoFill.addElement(FormLikeFactory.createFromField(input));
-        }
-        break;
-      }
-
-      case "DOMMetaAdded":
-        let target = aEvent.originalTarget;
-        let browser = BrowserApp.getBrowserForDocument(target.ownerDocument);
-
-        switch (target.name) {
-          case "msapplication-TileImage":
-            this.addMetadata(
-              "tileImage",
-              browser.currentURI.resolve(target.content),
-              this.METADATA_GOOD_MATCH
-            );
-            break;
-          case "msapplication-TileColor":
-            this.addMetadata(
-              "tileColor",
-              target.content,
-              this.METADATA_GOOD_MATCH
-            );
-            break;
-        }
-
-        break;
-
-      case "DOMLinkAdded":
-      case "DOMLinkChanged": {
-        let jsonMessage = null;
-        let target = aEvent.originalTarget;
-        if (!target.href || target.disabled) {
-          return;
-        }
-
-        // Ignore on frames and other documents
-        if (target.ownerDocument != this.browser.contentDocument) {
-          return;
-        }
-
-        // Sanitize rel link
-        let list = this.sanitizeRelString(target.rel);
-        if (list.includes("[icon]")) {
-          jsonMessage = this.makeFaviconMessage(target);
-        } else if (
-          list.includes("[apple-touch-icon]") ||
-          list.includes("[apple-touch-icon-precomposed]")
-        ) {
-          jsonMessage = this.makeFaviconMessage(target);
-          jsonMessage.type = "Link:Touchicon";
-          this.addMetadata("touchIconList", jsonMessage.href, jsonMessage.size);
-        } else if (
-          list.includes("[alternate]") &&
-          aEvent.type == "DOMLinkAdded"
-        ) {
-          let type = target.type
-            .toLowerCase()
-            .replace(/^\s+|\s*(?:;.*)?$/g, "");
-          let isFeed =
-            type == "application/rss+xml" || type == "application/atom+xml";
-
-          if (!isFeed) {
-            return;
-          }
-
-          jsonMessage = this.makeFeedMessage(target, type);
-        } else if (list.includes("[search]") && aEvent.type == "DOMLinkAdded") {
-          this.sendOpenSearchMessage(target);
-        } else if (
-          list.includes("[manifest]") &&
-          aEvent.type == "DOMLinkAdded"
-        ) {
-          this.makeManifestMessage(target);
-          return;
-        }
-        if (!jsonMessage) {
-          return;
-        }
-
-        GlobalEventDispatcher.sendRequest(jsonMessage);
-        break;
-      }
-
-      case "DOMTitleChanged": {
-        if (!aEvent.isTrusted) {
-          return;
-        }
-
-        // ignore on frames and other documents
-        if (aEvent.originalTarget != this.browser.contentDocument) {
-          return;
-        }
-
-        GlobalEventDispatcher.sendRequest({
-          type: "Content:DOMTitleChanged",
-          tabID: this.id,
-          title: truncate(aEvent.target.title, MAX_TITLE_LENGTH),
-        });
-        break;
-      }
-
-      case "TabPreZombify": {
-        if (!this.playingAudio) {
-          return;
-        }
-        // Fall through to the DOMAudioPlayback events, so the
-        // audio playback indicator gets reset upon zombification.
-      }
-      case "DOMAudioPlaybackStarted":
-      case "DOMAudioPlaybackStopped": {
-        if (
-          !Services.prefs.getBoolPref("browser.tabs.showAudioPlayingIcon") ||
-          !aEvent.isTrusted
-        ) {
-          return;
-        }
-
-        let browser = aEvent.originalTarget;
-        if (browser != this.browser) {
-          return;
-        }
-
-        this.playingAudio = aEvent.type === "DOMAudioPlaybackStarted";
-
-        GlobalEventDispatcher.sendRequest({
-          type: "Tab:AudioPlayingChange",
-          tabID: this.id,
-          isAudioPlaying: this.playingAudio,
-        });
-        return;
-      }
-
-      case "DOMWindowClose": {
-        if (!aEvent.isTrusted) {
-          return;
-        }
-
-        // Find the relevant tab, and close it from Java
-        if (this.browser.contentWindow == aEvent.target) {
-          aEvent.preventDefault();
-
-          GlobalEventDispatcher.sendRequest({
-            type: "Tab:Close",
-            tabID: this.id,
-          });
-        }
-        break;
-      }
-
-      case "DOMWillOpenModalDialog": {
-        if (!aEvent.isTrusted) {
-          return;
-        }
-
-        // We're about to open a modal dialog, make sure the opening
-        // tab is brought to the front.
-        let tab = BrowserApp.getTabForWindow(aEvent.target.top);
-        BrowserApp.selectTab(tab);
-        break;
-      }
-
-      case "VideoBindingAttached": {
-        CastingApps.handleVideoBindingAttached(this, aEvent);
-        break;
-      }
-
-      case "VideoBindingCast": {
-        CastingApps.handleVideoBindingCast(this, aEvent);
-        break;
-      }
-
-      case "framefocusrequested": {
-        if (BrowserApp.selectedTab !== this) {
-          GlobalEventDispatcher.sendRequest({
-            type: "Tab:Select",
-            tabID: this.id,
-            foreground: true,
-          });
-          aEvent.preventDefault();
-        }
-        break;
-      }
-
-      case "focusin": {
-        if (
-          BrowserApp.selectedTab === this &&
-          aEvent.composedTarget instanceof HTMLInputElement
-        ) {
-          this._autoFill.onFocus(aEvent.composedTarget);
-        }
-        break;
-      }
-
-      case "focusout": {
-        if (
-          BrowserApp.selectedTab === this &&
-          aEvent.composedTarget instanceof HTMLInputElement
-        ) {
-          this._autoFill.onFocus(null);
-        }
-        break;
-      }
-
-      case "TabSelect": {
-        this._autoFill.clearElements();
-        this._autoFill.scanDocument(this.browser.contentDocument);
-        break;
-      }
-
-      case "pagehide": {
-        if (
-          BrowserApp.selectedTab === this &&
-          aEvent.target === this.browser.contentDocument
-        ) {
-          this._autoFill.clearElements();
-        }
-        break;
-      }
-
-      case "pageshow": {
-        if (
-          BrowserApp.selectedTab === this &&
-          aEvent.target === this.browser.contentDocument &&
-          aEvent.persisted
-        ) {
-          this._autoFill.scanDocument(aEvent.target);
-        }
-
-        // The rest of this only handles pageshow for the top-level document.
-        if (aEvent.originalTarget.defaultView != this.browser.contentWindow) {
-          return;
-        }
-
-        GlobalEventDispatcher.sendRequest({
-          type: "Content:PageShow",
-          tabID: this.id,
-          userRequested: this.userRequested,
-          fromCache: Tabs.useCache,
-        });
-
-        if (
-          !aEvent.persisted &&
-          Services.prefs.getBoolPref("browser.ui.linkify.phone")
-        ) {
-          if (!this._linkifier) {
-            this._linkifier = new Linkifier();
-          }
-          this._linkifier.linkifyNumbers(this.browser.contentWindow.document);
-        }
-
-        // Update page actions for helper apps.
-        let uri = this.browser.currentURI;
-        if (BrowserApp.selectedTab == this) {
-          if (ExternalApps.shouldCheckUri(uri)) {
-            ExternalApps.updatePageAction(uri, this.browser.contentDocument);
-          } else {
-            ExternalApps.clearPageAction();
-          }
-        }
-      }
-    }
-  },
-
-  onStateChange: function(aWebProgress, aRequest, aStateFlags, aStatus) {
-    let contentWin = aWebProgress.DOMWindow;
-    if (contentWin != contentWin.top) {
-      return;
-    }
-
-    // Filter optimization: Only really send NETWORK state changes to Java listener
-    if (aStateFlags & Ci.nsIWebProgressListener.STATE_IS_NETWORK) {
-      if (AppConstants.MOZ_ENABLE_PROFILER_SPS && AppConstants.NIGHTLY_BUILD) {
-        if (aStateFlags & Ci.nsIWebProgressListener.STATE_START) {
-          Profiler.AddMarker(
-            "Load start: " +
-              aRequest.QueryInterface(Ci.nsIChannel).originalURI.spec
-          );
-        } else if (
-          aStateFlags & Ci.nsIWebProgressListener.STATE_STOP &&
-          !aWebProgress.isLoadingDocument
-        ) {
-          Profiler.AddMarker(
-            "Load stop: " +
-              aRequest.QueryInterface(Ci.nsIChannel).originalURI.spec
-          );
-        }
-      }
-
-      if (
-        aStateFlags & Ci.nsIWebProgressListener.STATE_STOP &&
-        aWebProgress.isLoadingDocument
-      ) {
-        // We may receive a document stop event while a document is still loading
-        // (such as when doing URI fixup). Don't notify Java UI in these cases.
-        return;
-      }
-
-      // Clear page-specific opensearch engines and feeds for a new request.
-      if (
-        aStateFlags & Ci.nsIWebProgressListener.STATE_START &&
-        aRequest &&
-        aWebProgress.isTopLevel
-      ) {
-        this.browser.engines = null;
-        this.browser.feeds = null;
-      }
-
-      // true if the page loaded successfully (i.e., no 404s or other errors)
-      let success = false;
-      let uri = "";
-      try {
-        // Remember original URI for UA changes on redirected pages
-        this.originalURI = aRequest.QueryInterface(Ci.nsIChannel).originalURI;
-
-        if (this.originalURI != null) {
-          uri = this.originalURI.displaySpec;
-        }
-      } catch (e) {}
-      try {
-        success = aRequest.QueryInterface(Ci.nsIHttpChannel).requestSucceeded;
-      } catch (e) {
-        // If the request does not handle the nsIHttpChannel interface, use nsIRequest's success
-        // status. Used for local files. See bug 948849.
-        success = aRequest.status == 0;
-      }
-
-      // Check to see if we restoring the content from a previous presentation (session)
-      // since there should be no real network activity
-      let restoring =
-        (aStateFlags & Ci.nsIWebProgressListener.STATE_RESTORING) > 0;
-
-      let message = {
-        type: "Content:StateChange",
-        tabID: this.id,
-        uri: truncate(uri, MAX_URI_LENGTH),
-        state: aStateFlags,
-        restoring: restoring,
-        success: success,
-      };
-      GlobalEventDispatcher.sendRequest(message);
-    }
-  },
-
-  // eslint-disable-next-line complexity
-  onLocationChange: function(aWebProgress, aRequest, aLocationURI, aFlags) {
-    let contentWin = aWebProgress.DOMWindow;
-    let webNav = contentWin.docShell.QueryInterface(Ci.nsIWebNavigation);
-
-    // Browser webapps may load content inside iframes that can not reach across the app/frame boundary
-    // i.e. even though the page is loaded in an iframe window.top != webapp
-    // Make cure this window is a top level tab before moving on.
-    if (BrowserApp.getBrowserForWindow(contentWin) == null) {
-      // We still need to update the back/forward button state, though.
-      let message = {
-        type: "Content:SubframeNavigation",
-        tabID: this.id,
-        canGoBack: webNav.canGoBack,
-        canGoForward: webNav.canGoForward,
-      };
-
-      GlobalEventDispatcher.sendRequest(message);
-      return;
-    }
-
-    this._hostChanged = true;
-
-    let fixedURI = aLocationURI;
-    try {
-      fixedURI = Services.uriFixup.createExposableURI(aLocationURI);
-    } catch (ex) {}
-
-    // In restricted profiles, we refuse to let you open various urls.
-    if (!ParentalControls.isAllowed(ParentalControls.BROWSE, fixedURI)) {
-      if (aRequest) {
-        aRequest.cancel(Cr.NS_BINDING_ABORTED);
-      }
-
-      this.browser.docShell.displayLoadError(
-        Cr.NS_ERROR_UNKNOWN_PROTOCOL,
-        fixedURI,
-        null
-      );
-    }
-
-    let contentType = contentWin.document.contentType;
-
-    // If fixedURI matches browser.lastURI, we assume this isn't a real location
-    // change but rather a spurious addition like adding a username/password. See Bug 747883.
-    // XXXbz Is this still relevant now that document.open doesn't do such
-    // things?  See bug 1528448.
-    // Note that we have to ensure fixedURI is not the same as aLocationURI so we
-    // don't false-positive page reloads as spurious additions.
-    let sameDocument =
-      (aFlags & Ci.nsIWebProgressListener.LOCATION_CHANGE_SAME_DOCUMENT) != 0 ||
-      (this.browser.lastURI != null &&
-        fixedURI.equals(this.browser.lastURI) &&
-        !fixedURI.equals(aLocationURI));
-    this.browser.lastURI = fixedURI;
-
-    // Let the reader logic know about same document changes because we won't get a DOMContentLoaded
-    // or pageshow event, but we'll still want to update the reader view button to account for this change.
-    // This mirrors the desktop logic in TabsProgressListener.
-    if (aFlags & Ci.nsIWebProgressListener.LOCATION_CHANGE_SAME_DOCUMENT) {
-      this.browser.messageManager.sendAsyncMessage("Reader:PushState", {
-        isArticle: this.browser.isArticle,
-      });
-    }
-
-    let baseDomain = getBaseDomain(contentWin.document.nodePrincipal.URI);
-    let highlightDomain = getBaseDomain(fixedURI);
-
-    // If we are navigating to a new location with a different host,
-    // clear any URL origin that might have been pinned to this tab.
-    let ss = Cc["@mozilla.org/browser/sessionstore;1"].getService(
-      Ci.nsISessionStore
-    );
-    let appOrigin = ss.getTabValue(this, "appOrigin");
-    if (appOrigin) {
-      let originHost = "";
-      try {
-        originHost = Services.io.newURI(appOrigin).host;
-      } catch (e) {
-        if (e.result != Cr.NS_ERROR_FAILURE) {
-          throw e;
-        }
-        // NS_ERROR_FAILURE can be thrown by nsIURI.host if the URI scheme does not possess a host -
-        // in this case we just act as if we have an empty host.
-      }
-      let locationHost = "";
-      try {
-        locationHost = aLocationURI.host;
-      } catch (e) {
-        if (e.result != Cr.NS_ERROR_FAILURE) {
-          throw e;
-        }
-        // Ditto.
-      }
-      if (originHost != locationHost || originHost == "") {
-        // Note: going 'back' will not make this tab pinned again
-        ss.deleteTabValue(this, "appOrigin");
-      }
-    }
-
-    // Update the page actions URI for helper apps.
-    if (BrowserApp.selectedTab == this) {
-      ExternalApps.updatePageActionUri(fixedURI);
-    }
-
-    if (
-      (!aRequest || Components.isSuccessCode(aRequest.status)) &&
-      !(aFlags & Ci.nsIWebProgressListener.LOCATION_CHANGE_ERROR_PAGE) &&
-      !this.isSearch
-    ) {
-      // If this won't end up in an error page and the user isn't searching,
-      // don't retain the typed entry.
-      this.userRequested = "";
-    }
-
-    let message = {
-      type: "Content:LocationChange",
-      tabID: this.id,
-      uri: truncate(fixedURI.displaySpec, MAX_URI_LENGTH),
-      userRequested: this.userRequested || "",
-      baseDomain,
-      highlightDomain,
-      contentType: contentType ? contentType : "",
-      sameDocument,
-
-      canGoBack: webNav.canGoBack,
-      canGoForward: webNav.canGoForward,
-    };
-
-    GlobalEventDispatcher.sendRequest(message);
-
-    notifyManifestStatus(this);
-
-    // Reset isSearch so that the userRequested term will be erased on next location change.
-    this.isSearch = false;
-
-    if (!sameDocument) {
-      // XXX This code assumes that this is the earliest hook we have at which
-      // browser.contentDocument is changed to the new document we're loading
-      this.contentDocumentIsDisplayed = false;
-      this.hasTouchListener = false;
-      Services.obs.notifyObservers(
-        this.browser,
-        "Session:NotifyLocationChange"
-      );
-    }
-  },
-
-  // Properties used to cache security state used to update the UI
-  _state: null,
-  _hostChanged: false, // onLocationChange will flip this bit
-
-  onSecurityChange: function(aWebProgress, aRequest, aState) {
-    // Don't need to do anything if the data we use to update the UI hasn't changed
-    if (this._state == aState && !this._hostChanged) {
-      return;
-    }
-
-    this._state = aState;
-    this._hostChanged = false;
-
-    let identity = IdentityHandler.checkIdentity(aState, this.browser);
-
-    let message = {
-      type: "Content:SecurityChange",
-      tabID: this.id,
-      identity: identity,
-    };
-
-    GlobalEventDispatcher.sendRequest(message);
-  },
-
-  // Cache last tracking event to limit firings and only propagate changes
-  _tracking: null,
-
-  onContentBlockingEvent: function(aWebProgress, aRequest, aState) {
-    let trackingMode = IdentityHandler.getTrackingMode(aState, this.browser);
-    if (this._tracking == trackingMode) {
-      return;
-    }
-    this._tracking = trackingMode;
-
-    let message = {
-      type: "Content:ContentBlockingEvent",
-      tabID: this.id,
-      tracking: trackingMode,
-    };
-
-    GlobalEventDispatcher.sendRequest(message);
-  },
-
-  OnHistoryNewEntry: function(newURI, oldIndex) {
-    Services.obs.notifyObservers(this.browser, "Content:HistoryChange");
-  },
-
-  OnHistoryReload: function() {
-    Services.obs.notifyObservers(this.browser, "Content:HistoryChange");
-    return true;
-  },
-
-  OnHistoryGotoIndex: function() {
-    Services.obs.notifyObservers(this.browser, "Content:HistoryChange");
-  },
-
-  OnHistoryPurge: function() {
-    Services.obs.notifyObservers(this.browser, "Content:HistoryChange");
-  },
-
-  OnHistoryReplaceEntry: function() {
-    Services.obs.notifyObservers(this.browser, "Content:HistoryChange");
-  },
-
-  UpdateMediaPlaybackRelatedObserver: function(active) {
-    // Media control is only used for the tab which has playing media, so we
-    // only need to register observer after having the active media. And the
-    // "media-playback-resumed" is sent when user resume paused media from
-    // page, it notifies us that we should change the icon and content in media
-    // control interface.
-    if (active) {
-      Services.obs.addObserver(this, "mediaControl");
-      Services.obs.addObserver(this, "media-playback-resumed");
-    } else {
-      Services.obs.removeObserver(this, "mediaControl");
-      Services.obs.removeObserver(this, "media-playback-resumed");
-    }
-  },
-
-  ShouldNotifyMediaPlaybackChange: function(activeState) {
-    // If the media is active, we would check it's duration, because we don't
-    // want to show the media control interface for the short sound which
-    // duration is smaller than the threshold. The basic unit is second.
-    // Note : the streaming format's duration is infinite.
-    if (activeState === "inactive") {
-      return true;
-    }
-
-    const mediaDurationThreshold = 1.0;
-
-    let audioElements = this.browser.contentDocument.getElementsByTagName(
-      "audio"
-    );
-    for (let audio of audioElements) {
-      if (!audio.paused && audio.duration < mediaDurationThreshold) {
-        return false;
-      }
-    }
-
-    let videoElements = this.browser.contentDocument.getElementsByTagName(
-      "video"
-    );
-    for (let video of videoElements) {
-      if (!video.paused && video.duration < mediaDurationThreshold) {
-        return false;
-      }
-    }
-
-    return true;
-  },
-
-  observe: function(aSubject, aTopic, aData) {
-    switch (aTopic) {
-      case "before-first-paint":
-        // Is it on the top level?
-        let contentDocument = aSubject;
-        if (contentDocument == this.browser.contentDocument) {
-          if (BrowserApp.selectedTab == this) {
-            BrowserApp.contentDocumentChanged();
-          }
-          this.contentDocumentIsDisplayed = true;
-        }
-        break;
-
-      case "media-playback":
-      case "media-playback-resumed":
-        if (!aSubject) {
-          return;
-        }
-
-        let winId = aSubject.QueryInterface(Ci.nsISupportsPRUint64).data;
-        if (this.browser.outerWindowID != winId) {
-          return;
-        }
-
-        if (!this.ShouldNotifyMediaPlaybackChange(aData)) {
-          return;
-        }
-
-        let status;
-        if (aTopic == "media-playback") {
-          let isActive = !(aData === "inactive");
-          status = isActive ? "start" : "end";
-          this.UpdateMediaPlaybackRelatedObserver(isActive);
-        } else if (aTopic == "media-playback-resumed") {
-          status = "resume";
-        }
-
-        GlobalEventDispatcher.sendRequest({
-          type: "Tab:MediaPlaybackChange",
-          tabID: this.id,
-          status: status,
-        });
-        break;
-
-      case "audioFocusChanged":
-      case "mediaControl":
-        let win = this.browser.contentWindow;
-        let utils = win.windowUtils;
-        let suspendTypes = Ci.nsISuspendedTypes;
-        switch (aData) {
-          case "lostAudioFocus":
-            utils.mediaSuspend = suspendTypes.SUSPENDED_PAUSE_DISPOSABLE;
-            break;
-          case "lostAudioFocusTransiently":
-            utils.mediaSuspend = suspendTypes.SUSPENDED_PAUSE;
-            break;
-          case "gainAudioFocus":
-            utils.mediaSuspend = suspendTypes.NONE_SUSPENDED;
-            break;
-          case "mediaControlPaused":
-            utils.mediaSuspend = suspendTypes.SUSPENDED_PAUSE_DISPOSABLE;
-            break;
-          case "mediaControlStopped":
-            utils.mediaSuspend = suspendTypes.SUSPENDED_STOP_DISPOSABLE;
-            break;
-          case "resumeMedia":
-            utils.mediaSuspend = suspendTypes.NONE_SUSPENDED;
-            break;
-          default:
-            dump("Error : wrong media control msg!\n");
-            break;
-        }
-        break;
-    }
-  },
-
-  // nsIBrowserTab
-  get window() {
-    if (!this.browser) {
-      return null;
-    }
-    return this.browser.contentWindow;
-  },
-
-  QueryInterface: ChromeUtils.generateQI([
-    Ci.nsIWebProgressListener,
-    Ci.nsISHistoryListener,
-    Ci.nsIObserver,
-    Ci.nsISupportsWeakReference,
-    Ci.nsIBrowserTab,
-  ]),
-};
-
-var BrowserEventHandler = {
-  init: function init() {
-    BrowserApp.deck.addEventListener("touchend", this, true);
-
-    BrowserApp.deck.addEventListener(
-      "DOMUpdateBlockedPopups",
-      PopupBlockerObserver.onUpdateBlockedPopups
-    );
-    BrowserApp.deck.addEventListener("MozMouseHittest", this, true);
-
-    // ReaderViews support backPress listeners.
-    WindowEventDispatcher.registerListener((event, data, callback) => {
-      callback.onSuccess(Reader.onBackPress(BrowserApp.selectedTab.id));
-    }, "Browser:OnBackPressed");
-  },
-
-  handleEvent: function(aEvent) {
-    switch (aEvent.type) {
-      case "touchend":
-        if (this._inCluster) {
-          aEvent.preventDefault();
-        }
-        break;
-      case "MozMouseHittest":
-        this._handleRetargetedTouchStart(aEvent);
-        break;
-    }
-  },
-
-  _handleRetargetedTouchStart: function(aEvent) {
-    // we should only get this called just after a new touchstart with a single
-    // touch point.
-    if (
-      !BrowserApp.isBrowserContentDocumentDisplayed() ||
-      aEvent.defaultPrevented
-    ) {
-      return;
-    }
-
-    let target = aEvent.composedTarget;
-    if (!target) {
-      return;
-    }
-
-    this._inCluster = aEvent.hitCluster;
-    if (this._inCluster) {
-      return; // No highlight for a cluster of links
-    }
-
-    let uri = this._getLinkURI(target);
-    if (uri) {
-      try {
-        Services.io
-          .QueryInterface(Ci.nsISpeculativeConnect)
-          .speculativeConnect(uri, target.ownerDocument.nodePrincipal, null);
-      } catch (e) {}
-    }
-    this._doTapHighlight(target);
-  },
-
-  _getLinkURI: function(aElement) {
-    if (
-      aElement.nodeType == aElement.ELEMENT_NODE &&
-      ((ChromeUtils.getClassName(aElement) === "HTMLAnchorElement" &&
-        aElement.href) ||
-        (ChromeUtils.getClassName(aElement) === "HTMLAreaElement" &&
-          aElement.href))
-    ) {
-      try {
-        return Services.io.newURI(aElement.href);
-      } catch (e) {}
-    }
-    return null;
-  },
-
-  _highlightElement: null,
-
-  _doTapHighlight: function _doTapHighlight(aElement) {
-    this._highlightElement = aElement;
-  },
-
-  _cancelTapHighlight: function _cancelTapHighlight() {
-    if (!this._highlightElement) {
-      return;
-    }
-
-    this._highlightElement = null;
-  },
-};
-
-var ErrorPageEventHandler = {
-  // eslint-disable-next-line complexity
-  handleEvent: function(aEvent) {
-    switch (aEvent.type) {
-      case "click": {
-        // Don't trust synthetic events
-        if (!aEvent.isTrusted) {
-          return;
-        }
-
-        let target = aEvent.originalTarget;
-        let errorDoc = target.ownerDocument;
-
-        // If the event came from an ssl error page, it is probably either the "Add
-        // Exception…" or "Get me out of here!" button
-        if (errorDoc.documentURI.startsWith("about:certerror?e=nssBadCert")) {
-          let perm = errorDoc.getElementById("permanentExceptionButton");
-          let temp = errorDoc.getElementById("temporaryExceptionButton");
-          if (target == temp || target == perm) {
-            // Handle setting an cert exception and reloading the page
-            let uri = Services.io.newURI(errorDoc.location.href);
-            let docShell = BrowserApp.selectedBrowser.docShell;
-            let securityInfo = docShell.failedChannel.securityInfo;
-            securityInfo.QueryInterface(Ci.nsITransportSecurityInfo);
-            let cert = securityInfo.serverCert;
-            let overrideService = Cc[
-              "@mozilla.org/security/certoverride;1"
-            ].getService(Ci.nsICertOverrideService);
-            let flags = 0;
-            if (securityInfo.isUntrusted) {
-              flags |= overrideService.ERROR_UNTRUSTED;
-            }
-            if (securityInfo.isDomainMismatch) {
-              flags |= overrideService.ERROR_MISMATCH;
-            }
-            if (securityInfo.isNotValidAtThisTime) {
-              flags |= overrideService.ERROR_TIME;
-            }
-            let temporary =
-              target == temp ||
-              PrivateBrowsingUtils.isWindowPrivate(errorDoc.defaultView);
-            overrideService.rememberValidityOverride(
-              uri.asciiHost,
-              uri.port,
-              cert,
-              flags,
-              temporary
-            );
-            errorDoc.location.reload();
-          } else if (
-            target == errorDoc.getElementById("getMeOutOfHereButton")
-          ) {
-            errorDoc.location = "about:home";
-          }
-        } else if (errorDoc.documentURI.startsWith("about:blocked")) {
-          // The event came from a button on a malware/phishing block page
-          // First check whether it's malware, phishing or unwanted, so that we
-          // can use the right strings/links
-          let bucketName = "";
-          const probe = "URLCLASSIFIER_UI_EVENTS";
-          let sendTelemetry = false;
-          if (errorDoc.documentURI.includes("e=malwareBlocked")) {
-            sendTelemetry = true;
-            bucketName = "WARNING_MALWARE_PAGE_";
-          } else if (errorDoc.documentURI.includes("e=deceptiveBlocked")) {
-            sendTelemetry = true;
-            bucketName = "WARNING_PHISHING_PAGE_";
-          } else if (errorDoc.documentURI.includes("e=unwantedBlocked")) {
-            sendTelemetry = true;
-            bucketName = "WARNING_UNWANTED_PAGE_";
-          } else if (errorDoc.documentURI.includes("e=harmfulBlocked")) {
-            sendTelemetry = true;
-            bucketName = "WARNING_HARMFUL_PAGE_";
-          }
-          let nsISecTel = Ci.nsISecurityUITelemetry;
-          let isIframe = errorDoc.defaultView.parent === errorDoc.defaultView;
-          bucketName += isIframe ? "TOP_" : "FRAME_";
-
-          let formatter = Services.urlFormatter;
-
-          if (target == errorDoc.getElementById("getMeOutButton")) {
-            if (sendTelemetry) {
-              Telemetry.addData(
-                probe,
-                nsISecTel[bucketName + "GET_ME_OUT_OF_HERE"]
-              );
-            }
-            errorDoc.location = "about:home";
-          } else if (target == errorDoc.getElementById("reportButton")) {
-            // We log even if malware/phishing info URL couldn't be found:
-            // the measurement is for how many users clicked the WHY BLOCKED button
-            if (sendTelemetry) {
-              Telemetry.addData(probe, nsISecTel[bucketName + "WHY_BLOCKED"]);
-            }
-
-            // This is the "Why is this site blocked" button. We redirect
-            // to the generic page describing phishing/malware protection.
-            let url = Services.urlFormatter.formatURLPref(
-              "app.support.baseURL"
-            );
-            BrowserApp.selectedBrowser.loadURI(url + "phishing-malware");
-          } else if (
-            target == errorDoc.getElementById("ignoreWarningButton") &&
-            Services.prefs.getBoolPref("browser.safebrowsing.allowOverride")
-          ) {
-            if (sendTelemetry) {
-              Telemetry.addData(
-                probe,
-                nsISecTel[bucketName + "IGNORE_WARNING"]
-              );
-            }
-
-            // Allow users to override and continue through to the site,
-            let webNav = BrowserApp.selectedBrowser.docShell.QueryInterface(
-              Ci.nsIWebNavigation
-            );
-            let location = BrowserApp.selectedBrowser.contentWindow.location;
-            let attrs = {};
-            let isPrivate = PrivateBrowsingUtils.isBrowserPrivate(
-              BrowserApp.selectedBrowser
-            );
-            if (isPrivate) {
-              attrs.privateBrowsingId = 1;
-            }
-
-            let loadURIOptions = {
-              triggeringPrincipal: Services.scriptSecurityManager.createNullPrincipal(
-                attrs
-              ),
-              loadFlags: Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_CLASSIFIER,
-            };
-            webNav.loadURI(location, loadURIOptions);
-
-            // ....but add a notify bar as a reminder, so that they don't lose
-            // track after, e.g., tab switching.
-            NativeWindow.doorhanger.show(
-              Strings.browser.GetStringFromName("safeBrowsingDoorhanger"),
-              "safebrowsing-warning",
-              [],
-              BrowserApp.selectedTab.id
-            );
-          }
-        }
-        break;
-      }
-    }
-  },
-};
-
-var XPInstallObserver = {
-  init: function() {
-    Services.obs.addObserver(this, "addon-install-origin-blocked");
-    Services.obs.addObserver(this, "addon-install-disabled");
-    Services.obs.addObserver(this, "addon-install-blocked");
-    Services.obs.addObserver(this, "addon-install-started");
-    Services.obs.addObserver(this, "xpi-signature-changed");
-    Services.obs.addObserver(this, "browser-delayed-startup-finished");
-
-    AddonManager.addInstallListener(this);
-  },
-
-  observe: function(aSubject, aTopic, aData) {
-    let installInfo, tab, host;
-    if (aSubject && aSubject.wrappedJSObject) {
-      installInfo = aSubject.wrappedJSObject;
-      tab = BrowserApp.getTabForBrowser(installInfo.browser);
-      if (installInfo.originatingURI) {
-        host = installInfo.originatingURI.displayHost;
-      }
-    }
-
-    let strings = Strings.browser;
-    let brandShortName = Strings.brand.GetStringFromName("brandShortName");
-
-    switch (aTopic) {
-      case "addon-install-started":
-        Snackbars.show(
-          strings.GetStringFromName("alertAddonsDownloading"),
-          Snackbars.LENGTH_LONG
-        );
-        break;
-      case "addon-install-disabled": {
-        if (!tab) {
-          return;
-        }
-
-        let enabled = Services.prefs.getBoolPref("xpinstall.enabled", true);
-
-        let buttons, message, callback;
-        if (!enabled) {
-          message = strings.GetStringFromName("xpinstallDisabledMessageLocked");
-          buttons = [
-            strings.GetStringFromName("unsignedAddonsDisabled.dismiss"),
-          ];
-          data => {};
-        } else {
-          message = strings.formatStringFromName("xpinstallDisabledMessage2", [
-            brandShortName,
-            host,
-          ]);
-          buttons = [
-            strings.GetStringFromName("xpinstallDisabledButton"),
-            strings.GetStringFromName("unsignedAddonsDisabled.dismiss"),
-          ];
-          data => {
-            if (data.button === 1) {
-              Services.prefs.setBoolPref("xpinstall.enabled", true);
-            }
-          };
-        }
-
-        new Prompt({
-          window: window,
-          title: Strings.browser.GetStringFromName("addonError.titleError"),
-          message: message,
-          buttons: buttons,
-        }).show(callback);
-        break;
-      }
-      case "addon-install-blocked": {
-        if (!tab) {
-          return;
-        }
-
-        let message;
-        if (host) {
-          // We have a host which asked for the install.
-          message = strings.formatStringFromName("xpinstallPromptWarning2", [
-            brandShortName,
-            host,
-          ]);
-        } else {
-          // Without a host we address the add-on as the initiator of the install.
-          let addon = null;
-          if (installInfo.installs.length > 0) {
-            addon = installInfo.installs[0].name;
-          }
-          if (addon) {
-            // We have an addon name, show the regular message.
-            message = strings.formatStringFromName(
-              "xpinstallPromptWarningLocal",
-              [brandShortName, addon]
-            );
-          } else {
-            // We don't have an addon name, show an alternative message.
-            message = strings.formatStringFromName(
-              "xpinstallPromptWarningDirect",
-              [brandShortName]
-            );
-          }
-        }
-
-        let buttons = [
-          strings.GetStringFromName("xpinstallPromptAllowButton"),
-          strings.GetStringFromName("unsignedAddonsDisabled.dismiss"),
-        ];
-        new Prompt({
-          window: window,
-          title: Strings.browser.GetStringFromName("addonError.titleBlocked"),
-          message: message,
-          buttons: buttons,
-        }).show(data => {
-          if (data.button === 0) {
-            // Kick off the install
-            installInfo.install();
-          }
-        });
-        break;
-      }
-      case "addon-install-origin-blocked": {
-        if (!tab) {
-          return;
-        }
-
-        new Prompt({
-          window: window,
-          title: Strings.browser.GetStringFromName("addonError.titleBlocked"),
-          message: strings.formatStringFromName(
-            "xpinstallPromptWarningDirect",
-            [brandShortName]
-          ),
-          buttons: [
-            strings.GetStringFromName("unsignedAddonsDisabled.dismiss"),
-          ],
-        }).show(data => {});
-        break;
-      }
-      case "xpi-signature-changed": {
-        if (JSON.parse(aData).disabled.length) {
-          this._notifyUnsignedAddonsDisabled();
-        }
-        break;
-      }
-      case "browser-delayed-startup-finished": {
-        let disabledAddons = AddonManager.getStartupChanges(
-          AddonManager.STARTUP_CHANGE_DISABLED
-        );
-        for (let id of disabledAddons) {
-          if (
-            AddonManager.getAddonByID(id).signedState <=
-            AddonManager.SIGNEDSTATE_MISSING
-          ) {
-            this._notifyUnsignedAddonsDisabled();
-            break;
-          }
-        }
-        this._monitorReportSiteIssueEnabledPref();
-        break;
-      }
-    }
-  },
-
-  _monitorReportSiteIssueEnabledPref: function() {
-    const PREF = "extensions.webcompat-reporter.enabled";
-    const ID = "webcompat-reporter@mozilla.org";
-    Services.prefs.addObserver(PREF, async () => {
-      let addon = await AddonManager.getAddonByID(ID);
-      let enabled = Services.prefs.getBoolPref(PREF, false);
-      if (enabled && !addon.isActive) {
-        await addon.enable({ allowSystemAddons: true });
-      } else if (!enabled && addon.isActive) {
-        await addon.disable({ allowSystemAddons: true });
-      }
-    });
-  },
-
-  _notifyUnsignedAddonsDisabled: function() {
-    new Prompt({
-      window: window,
-      title: Strings.browser.GetStringFromName("unsignedAddonsDisabled.title"),
-      message: Strings.browser.GetStringFromName(
-        "unsignedAddonsDisabled.message"
-      ),
-      buttons: [
-        Strings.browser.GetStringFromName("unsignedAddonsDisabled.viewAddons"),
-        Strings.browser.GetStringFromName("unsignedAddonsDisabled.dismiss"),
-      ],
-    }).show(data => {
-      if (data.button === 0) {
-        // TODO: Open about:addons to show only unsigned add-ons?
-        BrowserApp.selectOrAddTab("about:addons", {
-          parentId: BrowserApp.selectedTab.id,
-        });
-      }
-    });
-  },
-
-  onInstallEnded: function(aInstall, aAddon) {
-    // Don't create a notification for distribution add-ons.
-    if (Distribution.pendingAddonInstalls.has(aInstall)) {
-      Distribution.pendingAddonInstalls.delete(aInstall);
-      return;
-    }
-
-    let needsRestart = false;
-    if (
-      aInstall.existingAddon &&
-      aInstall.existingAddon.pendingOperations & AddonManager.PENDING_UPGRADE
-    ) {
-      needsRestart = true;
-    } else if (aAddon.pendingOperations & AddonManager.PENDING_INSTALL) {
-      needsRestart = true;
-    }
-
-    if (needsRestart) {
-      this.showRestartPrompt();
-    } else if (
-      !aInstall.existingAddon ||
-      !AddonManager.shouldAutoUpdate(aInstall.existingAddon)
-    ) {
-      // Display completion message for new installs or updates not done Automatically
-      let message = Strings.browser.GetStringFromName(
-        "alertAddonsInstalledNoRestart.message"
-      );
-      Snackbars.show(message, Snackbars.LENGTH_LONG, {
-        action: {
-          label: Strings.browser.GetStringFromName(
-            "alertAddonsInstalledNoRestart.action2"
-          ),
-          callback: () => {
-            UITelemetry.addEvent("show.1", "toast", null, "addons");
-            BrowserApp.selectOrAddTab("about:addons", {
-              parentId: BrowserApp.selectedTab.id,
-            });
-          },
-        },
-      });
-    }
-  },
-
-  onInstallFailed: function(aInstall) {
-    this._showErrorMessage(aInstall);
-  },
-
-  onDownloadProgress: function(aInstall) {},
-
-  onDownloadFailed: function(aInstall) {
-    this._showErrorMessage(aInstall);
-  },
-
-  onDownloadCancelled: function(aInstall) {},
-
-  _showErrorMessage: function(aInstall) {
-    // Don't create a notification for distribution add-ons.
-    if (Distribution.pendingAddonInstalls.has(aInstall)) {
-      Cu.reportError(
-        "Error installing distribution add-on: " + aInstall.addon.id
-      );
-      Distribution.pendingAddonInstalls.delete(aInstall);
-      return;
-    }
-
-    let host =
-      aInstall.originatingURI instanceof Ci.nsIStandardURL &&
-      aInstall.originatingURI.displayHost;
-    if (!host) {
-      host =
-        aInstall.sourceURI instanceof Ci.nsIStandardURL &&
-        aInstall.sourceURI.displayHost;
-    }
-
-    let error = host || aInstall.error == 0 ? "addonError" : "addonLocalError";
-    if (aInstall.error < 0) {
-      error += aInstall.error;
-    } else if (
-      aInstall.addon &&
-      aInstall.addon.blocklistState == Ci.nsIBlocklistService.STATE_BLOCKED
-    ) {
-      error += "Blocklisted";
-    } else {
-      error += "Incompatible";
-    }
-
-    let msg = Strings.browser.GetStringFromName(error);
-    // TODO: formatStringFromName
-    msg = msg.replace("#1", aInstall.name);
-    if (host) {
-      msg = msg.replace("#2", host);
-    }
-    msg = msg.replace("#3", Strings.brand.GetStringFromName("brandShortName"));
-    msg = msg.replace("#4", Services.appinfo.version);
-
-    if (aInstall.error == AddonManager.ERROR_SIGNEDSTATE_REQUIRED) {
-      new Prompt({
-        window: window,
-        title: Strings.browser.GetStringFromName("addonError.titleBlocked"),
-        message: msg,
-        buttons: [Strings.browser.GetStringFromName("addonError.learnMore")],
-      }).show(data => {
-        if (data.button === 0) {
-          let url =
-            Services.urlFormatter.formatURLPref("app.support.baseURL") +
-            "unsigned-addons";
-          BrowserApp.addTab(url, { parentId: BrowserApp.selectedTab.id });
-        }
-      });
-    } else {
-      Services.prompt.alert(
-        null,
-        Strings.browser.GetStringFromName("addonError.titleError"),
-        msg
-      );
-    }
-  },
-
-  showRestartPrompt: function() {
-    let buttons = [
-      {
-        label: Strings.browser.GetStringFromName("notificationRestart.button"),
-        callback: function() {
-          // Notify all windows that an application quit has been requested
-          let cancelQuit = Cc["@mozilla.org/supports-PRBool;1"].createInstance(
-            Ci.nsISupportsPRBool
-          );
-          Services.obs.notifyObservers(
-            cancelQuit,
-            "quit-application-requested",
-            "restart"
-          );
-
-          // If nothing aborted, quit the app
-          if (!cancelQuit.data) {
-            Services.obs.notifyObservers(null, "quit-application-proceeding");
-            SharedPreferences.forApp().setBoolPref(
-              "browser.sessionstore.resume_session_once",
-              true
-            );
-            let appStartup = Services.startup;
-            appStartup.quit(
-              Ci.nsIAppStartup.eRestart | Ci.nsIAppStartup.eAttemptQuit
-            );
-          }
-        },
-        positive: true,
-      },
-    ];
-
-    let message = Strings.browser.GetStringFromName(
-      "notificationRestart.normal"
-    );
-    NativeWindow.doorhanger.show(
-      message,
-      "addon-app-restart",
-      buttons,
-      BrowserApp.selectedTab.id,
-      { persistence: -1 },
-      "ADDON"
-    );
-  },
-
-  hideRestartPrompt: function() {
-    NativeWindow.doorhanger.hide(
-      "addon-app-restart",
-      BrowserApp.selectedTab.id
-    );
-  },
-};
-
-/**
- * Handler for blocked popups, triggered by DOMUpdateBlockedPopups events in browser.js
- */
-var PopupBlockerObserver = {
-  onUpdateBlockedPopups: function onUpdateBlockedPopups(aEvent) {
-    let browser = BrowserApp.selectedBrowser;
-    if (aEvent.originalTarget != browser) {
-      return;
-    }
-
-    if (!browser.blockedPopups) {
-      return;
-    }
-
-    let result = Services.perms.testExactPermissionFromPrincipal(
-      BrowserApp.selectedBrowser.contentPrincipal,
-      "popup"
-    );
-    if (result == Ci.nsIPermissionManager.DENY_ACTION) {
-      return;
-    }
-
-    // Only show the notification again if we've not already shown it. Since
-    // notifications are per-browser, we don't need to worry about re-adding
-    // it.
-    if (!browser.blockedPopups.reported) {
-      if (Services.prefs.getBoolPref("privacy.popups.showBrowserMessage")) {
-        let brandShortName = Strings.brand.GetStringFromName("brandShortName");
-        let popupCount = browser.blockedPopups.length;
-
-        let strings = Strings.browser;
-        let message = PluralForm.get(
-          popupCount,
-          strings.GetStringFromName("popup.message")
-        )
-          .replace("#1", brandShortName)
-          .replace("#2", popupCount);
-
-        let buttons = [
-          {
-            label: strings.GetStringFromName("popup.dontShow"),
-            callback: function(aChecked) {
-              if (aChecked) {
-                PopupBlockerObserver.allowPopupsForSite(false);
-              }
-            },
-          },
-          {
-            label: strings.GetStringFromName("popup.show"),
-            callback: function(aChecked) {
-              // Set permission before opening popup windows
-              if (aChecked) {
-                PopupBlockerObserver.allowPopupsForSite(true);
-              }
-
-              PopupBlockerObserver.showPopupsForSite();
-            },
-            positive: true,
-          },
-        ];
-
-        let options = {
-          checkbox: Strings.browser.GetStringFromName("popup.dontAskAgain"),
-        };
-        NativeWindow.doorhanger.show(
-          message,
-          "popup-blocked",
-          buttons,
-          null,
-          options
-        );
-      }
-      // Record the fact that we've reported this blocked popup, so we don't
-      // show it again.
-      browser.blockedPopups.reported = true;
-    }
-  },
-
-  allowPopupsForSite: function allowPopupsForSite(aAllow) {
-    let principal = BrowserApp.selectedBrowser.contentPrincipal;
-    Services.perms.addFromPrincipal(
-      principal,
-      "popup",
-      aAllow
-        ? Ci.nsIPermissionManager.ALLOW_ACTION
-        : Ci.nsIPermissionManager.DENY_ACTION
-    );
-  },
-
-  showPopupsForSite: function showPopupsForSite() {
-    let uri = BrowserApp.selectedBrowser.currentURI;
-    BrowserApp.selectedBrowser
-      .retrieveListOfBlockedPopups()
-      .then(blockedPopups => {
-        if (blockedPopups) {
-          for (let i = 0; i < blockedPopups.length; ++i) {
-            let popupURIspec = blockedPopups[i].popupWindowURIspec;
-
-            // Sometimes the popup URI that we get back from blockedPopups
-            // isn't useful (for instance, netscape.com's popup URI ends up
-            // being "http://www.netscape.com", which isn't really the URI of
-            // the popup they're trying to show).  This isn't going to be
-            // useful to the user, so we won't create a menu item for it.
-            if (
-              popupURIspec == "" ||
-              popupURIspec == "about:blank" ||
-              popupURIspec == uri.spec
-            ) {
-              continue;
-            }
-
-            let popupFeatures = blockedPopups[i].popupWindowFeatures;
-            let popupName = blockedPopups[i].popupWindowName;
-
-            let parent = BrowserApp.selectedTab;
-            let isPrivate = PrivateBrowsingUtils.isBrowserPrivate(
-              parent.browser
-            );
-            BrowserApp.addTab(popupURIspec, {
-              parentId: parent.id,
-              isPrivate: isPrivate,
-            });
-          }
-        }
-      });
-  },
-};
-
-var IndexedDB = {
-  _permissionsPrompt: "indexedDB-permissions-prompt",
-  _permissionsResponse: "indexedDB-permissions-response",
-
-  init: function IndexedDB_init() {
-    Services.obs.addObserver(this, this._permissionsPrompt);
-  },
-
-  observe: function IndexedDB_observe(subject, topic, data) {
-    if (topic != this._permissionsPrompt) {
-      throw new Error("Unexpected topic!");
-    }
-
-    let request = subject.QueryInterface(Ci.nsIIDBPermissionsRequest);
-
-    let browser = request.browserElement;
-    let tab = BrowserApp.getTabForBrowser(browser);
-    if (!tab) {
-      return;
-    }
-
-    let host = browser.currentURI.asciiHost;
-
-    let strings = Strings.browser;
-
-    let message, responseTopic;
-    if (topic == this._permissionsPrompt) {
-      message = strings.formatStringFromName("offlineApps.ask", [host]);
-      responseTopic = this._permissionsResponse;
-    }
-
-    const firstTimeoutDuration = 300000; // 5 minutes
-
-    let timeoutId;
-
-    let notificationID = responseTopic + host;
-    let observer = request.responseObserver;
-
-    // This will be set to the result of PopupNotifications.show() below, or to
-    // the result of PopupNotifications.getNotification() if this is a
-    // quotaCancel notification.
-    let notification;
-
-    function timeoutNotification() {
-      // Remove the notification.
-      NativeWindow.doorhanger.hide(notificationID, tab.id);
-
-      // Clear all of our timeout stuff. We may be called directly, not just
-      // when the timeout actually elapses.
-      clearTimeout(timeoutId);
-
-      // And tell the page that the popup timed out.
-      observer.observe(
-        null,
-        responseTopic,
-        Ci.nsIPermissionManager.UNKNOWN_ACTION
-      );
-    }
-
-    let buttons = [
-      {
-        label: strings.GetStringFromName("offlineApps.dontAllow2"),
-        callback: function(aChecked) {
-          clearTimeout(timeoutId);
-          let action = aChecked
-            ? Ci.nsIPermissionManager.DENY_ACTION
-            : Ci.nsIPermissionManager.UNKNOWN_ACTION;
-          observer.observe(null, responseTopic, action);
-        },
-      },
-      {
-        label: strings.GetStringFromName("offlineApps.allow"),
-        callback: function() {
-          clearTimeout(timeoutId);
-          observer.observe(
-            null,
-            responseTopic,
-            Ci.nsIPermissionManager.ALLOW_ACTION
-          );
-        },
-        positive: true,
-      },
-    ];
-
-    let options = {
-      checkbox: Strings.browser.GetStringFromName("offlineApps.dontAskAgain"),
-    };
-    NativeWindow.doorhanger.show(
-      message,
-      notificationID,
-      buttons,
-      tab.id,
-      options
-    );
-
-    // Set the timeoutId after the popup has been created, and use the long
-    // timeout value. If the user doesn't notice the popup after this amount of
-    // time then it is most likely not visible and we want to alert the page.
-    timeoutId = setTimeout(timeoutNotification, firstTimeoutDuration);
-  },
-};
-
-var CharacterEncoding = {
-  _charsets: [],
-
-  init: function init() {
-    GlobalEventDispatcher.registerListener(this, [
-      "CharEncoding:Get",
-      "CharEncoding:Set",
-    ]);
-    InitLater(() => this.sendState());
-  },
-
-  onEvent: function onEvent(event, data, callback) {
-    switch (event) {
-      case "CharEncoding:Get":
-        this.getEncoding();
-        break;
-      case "CharEncoding:Set":
-        this.setEncoding(data.encoding);
-        break;
-    }
-  },
-
-  sendState: function sendState() {
-    let showCharEncoding = "false";
-    try {
-      showCharEncoding = Services.prefs.getComplexValue(
-        "browser.menu.showCharacterEncoding",
-        Ci.nsIPrefLocalizedString
-      ).data;
-    } catch (e) {
-      /* Optional */
-    }
-
-    GlobalEventDispatcher.sendRequest({
-      type: "CharEncoding:State",
-      visible: showCharEncoding,
-    });
-  },
-
-  getEncoding: function getEncoding() {
-    function infoToCharset(info) {
-      return { code: info.value, title: info.label };
-    }
-
-    if (!this._charsets.length) {
-      let data = CharsetMenu.getData();
-
-      // In the desktop UI, the pinned charsets are shown above the rest.
-      let pinnedCharsets = data.pinnedCharsets.map(infoToCharset);
-      let otherCharsets = data.otherCharsets.map(infoToCharset);
-
-      this._charsets = pinnedCharsets.concat(otherCharsets);
-    }
-
-    // Look for the index of the selected charset. Default to -1 if the
-    // doc charset isn't found in the list of available charsets.
-    let docCharset = BrowserApp.selectedBrowser.contentDocument.characterSet;
-    let selected = -1;
-    let charsetCount = this._charsets.length;
-
-    for (let i = 0; i < charsetCount; i++) {
-      if (this._charsets[i].code === docCharset) {
-        selected = i;
-        break;
-      }
-    }
-
-    GlobalEventDispatcher.sendRequest({
-      type: "CharEncoding:Data",
-      charsets: this._charsets,
-      selected: selected,
-    });
-  },
-
-  setEncoding: function setEncoding(aEncoding) {
-    let browser = BrowserApp.selectedBrowser;
-    browser.docShell.gatherCharsetMenuTelemetry();
-    browser.docShell.charset = aEncoding;
-    browser.reload(Ci.nsIWebNavigation.LOAD_FLAGS_CHARSET_CHANGE);
-  },
-};
-
-var IdentityHandler = {
-  // No trusted identity information. No site identity icon is shown.
-  IDENTITY_MODE_UNKNOWN: "unknown",
-
-  // Domain-Validation SSL CA-signed domain verification (DV).
-  IDENTITY_MODE_IDENTIFIED: "identified",
-
-  // Extended-Validation SSL CA-signed identity information (EV). A more rigorous validation process.
-  IDENTITY_MODE_VERIFIED: "verified",
-
-  // Part of the product's UI (built in about: pages)
-  IDENTITY_MODE_CHROMEUI: "chromeUI",
-
-  // The following mixed content modes are only used if "security.mixed_content.block_active_content"
-  // is enabled. Our Java frontend coalesces them into one indicator.
-
-  // No mixed content information. No mixed content icon is shown.
-  MIXED_MODE_UNKNOWN: "unknown",
-
-  // Blocked active mixed content.
-  MIXED_MODE_CONTENT_BLOCKED: "blocked",
-
-  // Loaded active mixed content.
-  MIXED_MODE_CONTENT_LOADED: "loaded",
-
-  // The following tracking content modes are only used if tracking protection
-  // is enabled. Our Java frontend coalesces them into one indicator.
-
-  // No tracking content information. No tracking content icon is shown.
-  TRACKING_MODE_UNKNOWN: "unknown",
-
-  // Blocked active tracking content. Shield icon is shown, with a popup option to load content.
-  TRACKING_MODE_CONTENT_BLOCKED: "tracking_content_blocked",
-
-  // Loaded active tracking content. Yellow triangle icon is shown.
-  TRACKING_MODE_CONTENT_LOADED: "tracking_content_loaded",
-
-  // Cache the most recent TransportSecurityInfo and Location seen in
-  // getIdentityStrings
-  _lastSecInfo: null,
-  _lastLocation: null,
-
-  /**
-   * Helper to parse out the important parts of _lastSecInfo (of the SSL cert in
-   * particular) for use in constructing identity UI strings
-   */
-  getIdentityData: function() {
-    let result = {};
-    let cert = this._lastSecInfo.serverCert;
-
-    // Human readable name of Subject
-    result.subjectOrg = cert.organization;
-
-    // SubjectName fields, broken up for individual access
-    if (cert.subjectName) {
-      result.subjectNameFields = {};
-      cert.subjectName.split(",").forEach(function(v) {
-        let field = v.split("=");
-        this[field[0]] = field[1];
-      }, result.subjectNameFields);
-
-      // Call out city, state, and country specifically
-      result.city = result.subjectNameFields.L;
-      result.state = result.subjectNameFields.ST;
-      result.country = result.subjectNameFields.C;
-    }
-
-    // Human readable name of Certificate Authority
-    result.caOrg = cert.issuerOrganization || cert.issuerCommonName;
-    result.cert = cert;
-
-    return result;
-  },
-
-  /**
-   * Determines the identity mode corresponding to the icon we show in the urlbar.
-   */
-  getIdentityMode: function getIdentityMode(aState, uri) {
-    if (aState & Ci.nsIWebProgressListener.STATE_IDENTITY_EV_TOPLEVEL) {
-      return this.IDENTITY_MODE_VERIFIED;
-    }
-
-    if (aState & Ci.nsIWebProgressListener.STATE_IS_SECURE) {
-      return this.IDENTITY_MODE_IDENTIFIED;
-    }
-
-    let whitelist = /^about:(about|accounts|addons|buildconfig|cache|compat|config|crashes|devices|downloads|experiments|fennec|firefox|feedback|home|license|logins|logo|memory|mozilla|networking|privatebrowsing|rights|serviceworkers|support|telemetry|webrtc)($|\?)/i;
-    if (uri.schemeIs("about") && whitelist.test(uri.spec)) {
-      return this.IDENTITY_MODE_CHROMEUI;
-    }
-
-    return this.IDENTITY_MODE_UNKNOWN;
-  },
-
-  getMixedDisplayMode: function getMixedDisplayMode(aState) {
-    if (aState & Ci.nsIWebProgressListener.STATE_LOADED_MIXED_DISPLAY_CONTENT) {
-      return this.MIXED_MODE_CONTENT_LOADED;
-    }
-
-    if (
-      aState & Ci.nsIWebProgressListener.STATE_BLOCKED_MIXED_DISPLAY_CONTENT
-    ) {
-      return this.MIXED_MODE_CONTENT_BLOCKED;
-    }
-
-    return this.MIXED_MODE_UNKNOWN;
-  },
-
-  getMixedActiveMode: function getActiveDisplayMode(aState) {
-    // Only show an indicator for loaded mixed content if the pref to block it is enabled
-    if (
-      aState & Ci.nsIWebProgressListener.STATE_LOADED_MIXED_ACTIVE_CONTENT &&
-      !Services.prefs.getBoolPref("security.mixed_content.block_active_content")
-    ) {
-      return this.MIXED_MODE_CONTENT_LOADED;
-    }
-
-    if (aState & Ci.nsIWebProgressListener.STATE_BLOCKED_MIXED_ACTIVE_CONTENT) {
-      return this.MIXED_MODE_CONTENT_BLOCKED;
-    }
-
-    return this.MIXED_MODE_UNKNOWN;
-  },
-
-  getTrackingMode: function getTrackingMode(aState, aBrowser) {
-    if (aState & Ci.nsIWebProgressListener.STATE_BLOCKED_TRACKING_CONTENT) {
-      this.shieldHistogramAdd(aBrowser, 2);
-      return this.TRACKING_MODE_CONTENT_BLOCKED;
-    }
-
-    // Only show an indicator for loaded tracking content if the pref to block it is enabled
-    let tpEnabled =
-      Services.prefs.getBoolPref("privacy.trackingprotection.enabled") ||
-      (Services.prefs.getBoolPref(
-        "privacy.trackingprotection.pbmode.enabled"
-      ) &&
-        PrivateBrowsingUtils.isBrowserPrivate(aBrowser));
-
-    if (
-      aState & Ci.nsIWebProgressListener.STATE_LOADED_TRACKING_CONTENT &&
-      tpEnabled
-    ) {
-      this.shieldHistogramAdd(aBrowser, 1);
-      return this.TRACKING_MODE_CONTENT_LOADED;
-    }
-
-    this.shieldHistogramAdd(aBrowser, 0);
-    return this.TRACKING_MODE_UNKNOWN;
-  },
-
-  shieldHistogramAdd: function(browser, value) {
-    if (PrivateBrowsingUtils.isBrowserPrivate(browser)) {
-      return;
-    }
-    Telemetry.addData("TRACKING_PROTECTION_SHIELD", value);
-  },
-
-  /**
-   * Determine the identity of the page being displayed by examining its SSL cert
-   * (if available). Return the data needed to update the UI.
-   */
-  checkIdentity: function checkIdentity(aState, aBrowser) {
-    this._lastSecInfo = aBrowser.securityUI.secInfo;
-
-    // Don't pass in the actual location object, since it can cause us to
-    // hold on to the window object too long.  Just pass in the fields we
-    // care about. (bug 424829)
-    let locationObj = {};
-    try {
-      let location = aBrowser.contentWindow.location;
-      locationObj.host = location.host;
-      locationObj.hostname = location.hostname;
-      locationObj.port = location.port;
-      locationObj.origin = location.origin;
-    } catch (ex) {
-      // Can sometimes throw if the URL being visited has no host/hostname,
-      // e.g. about:blank. The _state for these pages means we won't need these
-      // properties anyways, though.
-    }
-    this._lastLocation = locationObj;
-
-    this._uri = aBrowser.currentURI;
-    try {
-      this._uri = Services.uriFixup.createExposableURI(this._uri);
-    } catch (e) {}
-
-    let identityMode = this.getIdentityMode(aState, this._uri);
-    let mixedDisplay = this.getMixedDisplayMode(aState);
-    let mixedActive = this.getMixedActiveMode(aState);
-    let result = {
-      origin: locationObj.origin,
-      mode: {
-        identity: identityMode,
-        mixed_display: mixedDisplay,
-        mixed_active: mixedActive,
-      },
-    };
-
-    result.host = this.getEffectiveHost();
-
-    // Don't show identity data for pages with an unknown identity or if any
-    // mixed content is loaded (mixed display content is loaded by default).
-    // We also return for CHROMEUI pages since they don't have any certificate
-    // information to load either. result.secure specifically refers to connection
-    // security, which is irrelevant for about: pages, as they're loaded locally.
-    if (
-      identityMode == this.IDENTITY_MODE_UNKNOWN ||
-      identityMode == this.IDENTITY_MODE_CHROMEUI ||
-      aState & Ci.nsIWebProgressListener.STATE_IS_BROKEN
-    ) {
-      result.secure = false;
-      return result;
-    }
-
-    result.secure = true;
-
-    let iData = this.getIdentityData();
-    result.verifier = Strings.browser.formatStringFromName(
-      "identity.identified.verifier",
-      [iData.caOrg]
-    );
-
-    // If the cert is identified, then we can populate the results with credentials
-    if (aState & Ci.nsIWebProgressListener.STATE_IDENTITY_EV_TOPLEVEL) {
-      result.owner = iData.subjectOrg;
-
-      // Build an appropriate supplemental block out of whatever location data we have
-      let supplemental = "";
-      if (iData.city) {
-        supplemental += iData.city + "\n";
-      }
-      if (iData.state && iData.country) {
-        supplemental += Strings.browser.formatStringFromName(
-          "identity.identified.state_and_country",
-          [iData.state, iData.country]
-        );
-        result.country = iData.country;
-      } else if (iData.state) {
-        // State only
-        supplemental += iData.state;
-      } else if (iData.country) {
-        // Country only
-        supplemental += iData.country;
-        result.country = iData.country;
-      }
-      result.supplemental = supplemental;
-
-      return result;
-    }
-
-    // Cache the override service the first time we need to check it
-    if (!this._overrideService) {
-      this._overrideService = Cc[
-        "@mozilla.org/security/certoverride;1"
-      ].getService(Ci.nsICertOverrideService);
-    }
-
-    // Check whether this site is a security exception. XPConnect does the right
-    // thing here in terms of converting _lastLocation.port from string to int, but
-    // the overrideService doesn't like undefined ports, so make sure we have
-    // something in the default case (bug 432241).
-    // .hostname can return an empty string in some exceptional cases -
-    // hasMatchingOverride does not handle that, so avoid calling it.
-    // Updating the tooltip value in those cases isn't critical.
-    // FIXME: Fixing bug 646690 would probably makes this check unnecessary
-    if (
-      this._lastLocation.hostname &&
-      this._overrideService.hasMatchingOverride(
-        this._lastLocation.hostname,
-        this._lastLocation.port || 443,
-        iData.cert,
-        {},
-        {}
-      )
-    ) {
-      result.verifier = Strings.browser.GetStringFromName(
-        "identity.identified.verified_by_you"
-      );
-      result.securityException = true;
-    }
-    return result;
-  },
-
-  /**
-   * Attempt to provide proper IDN treatment for host names
-   */
-  getEffectiveHost: function getEffectiveHost() {
-    if (!this._IDNService) {
-      this._IDNService = Cc["@mozilla.org/network/idn-service;1"].getService(
-        Ci.nsIIDNService
-      );
-    }
-    try {
-      return this._IDNService.convertToDisplayIDN(this._uri.host, {});
-    } catch (e) {
-      // If something goes wrong (e.g. hostname is an IP address) just fail back
-      // to the full domain.
-      return this._lastLocation.hostname;
-    }
-  },
-};
-
-var SearchEngines = {
-  _contextMenuId: null,
-  PREF_SUGGEST_ENABLED: "browser.search.suggest.enabled",
-  PREF_SUGGEST_PROMPTED: "browser.search.suggest.prompted",
-
-  // Shared preference key used for search activity default engine.
-  PREF_SEARCH_ACTIVITY_ENGINE_KEY: "search.engines.defaultname",
-
-  init: function init() {
-    GlobalEventDispatcher.registerListener(this, [
-      "SearchEngines:Add",
-      "SearchEngines:GetVisible",
-      "SearchEngines:Remove",
-      "SearchEngines:RestoreDefaults",
-      "SearchEngines:SetDefault",
-    ]);
-    Services.obs.addObserver(this, "browser-search-engine-modified");
-  },
-
-  // Fetch list of search engines. all ? All engines : Visible engines only.
-  _handleSearchEnginesGetVisible: async function _handleSearchEnginesGetVisible(
-    rv,
-    all
-  ) {
-    if (!Components.isSuccessCode(rv)) {
-      Cu.reportError("Could not initialize search service, bailing out.");
-      return;
-    }
-
-    let engineData = await Services.search.getVisibleEngines({});
-
-    // Our Java UI assumes that the default engine is the first item in the array,
-    // so we need to make sure that's the case.
-    if (engineData[0].name !== Services.search.defaultEngine.name) {
-      engineData = engineData.filter(
-        engine => engine.name !== Services.search.defaultEngine.name
-      );
-      engineData.unshift(Services.search.defaultEngine);
-    }
-
-    let searchEngines = engineData.map(function(engine) {
-      return {
-        name: engine.name,
-        identifier: engine.identifier,
-        iconURI: engine.iconURI ? engine.iconURI.spec : null,
-        hidden: engine.hidden,
-      };
-    });
-
-    let suggestTemplate = null;
-    let suggestEngine = null;
-
-    // Check to see if the default engine supports search suggestions. We only need to check
-    // the default engine because we only show suggestions for the default engine in the UI.
-    let engine = Services.search.defaultEngine;
-    if (engine.supportsResponseType("application/x-suggestions+json")) {
-      suggestEngine = engine.name;
-      suggestTemplate = engine.getSubmission(
-        "__searchTerms__",
-        "application/x-suggestions+json"
-      ).uri.spec;
-    }
-
-    // By convention, the currently configured default engine is at position zero in searchEngines.
-    GlobalEventDispatcher.sendRequest({
-      type: "SearchEngines:Data",
-      searchEngines: searchEngines,
-      suggest: {
-        engine: suggestEngine,
-        template: suggestTemplate,
-        enabled: Services.prefs.getBoolPref(this.PREF_SUGGEST_ENABLED),
-        prompted: Services.prefs.getBoolPref(this.PREF_SUGGEST_PROMPTED),
-      },
-    });
-
-    // Send a speculative connection to the default engine.
-    Services.search.defaultEngine.speculativeConnect({
-      window: window,
-      originAttributes: {},
-    });
-  },
-
-  // Helper method to extract the engine name from a JSON. Simplifies the observe function.
-  _extractEngineFromJSON: function _extractEngineFromJSON(data) {
-    return Services.search.getEngineByName(data.engine);
-  },
-
-  onEvent: function(event, data, callback) {
-    let engine;
-    switch (event) {
-      case "SearchEngines:Add":
-        this.displaySearchEnginesList(data);
-        break;
-      case "SearchEngines:GetVisible":
-        Services.search
-          .init()
-          .then(this._handleSearchEnginesGetVisible.bind(this));
-        break;
-      case "SearchEngines:Remove":
-        // Make sure the engine isn't hidden before removing it, to make sure it's
-        // visible if the user later re-adds it (works around bug 341833)
-        engine = this._extractEngineFromJSON(data);
-        engine.hidden = false;
-        Services.search.removeEngine(engine);
-        break;
-      case "SearchEngines:RestoreDefaults":
-        // Un-hides all default engines.
-        Services.search.restoreDefaultEngines();
-        break;
-      case "SearchEngines:SetDefault":
-        engine = this._extractEngineFromJSON(data);
-        // Move the new default search engine to the top of the search engine list.
-        Services.search
-          .moveEngine(engine, 0)
-          .then(() => (Services.search.defaultEngine = engine));
-        break;
-      default:
-        dump("Unexpected message type observed: " + event);
-        break;
-    }
-  },
-
-  observe: function observe(aSubject, aTopic, aData) {
-    switch (aTopic) {
-      case "browser-search-engine-modified":
-        if (aData == "engine-default") {
-          this._setSearchActivityDefaultPref(
-            aSubject.QueryInterface(Ci.nsISearchEngine)
-          );
-        }
-        break;
-      default:
-        dump("Unexpected message type observed: " + aTopic);
-        break;
-    }
-  },
-
-  migrateSearchActivityDefaultPref: function migrateSearchActivityDefaultPref() {
-    Services.search
-      .init()
-      .then(() =>
-        this._setSearchActivityDefaultPref(Services.search.defaultEngine)
-      );
-  },
-
-  // Updates the search activity pref when the default engine changes.
-  _setSearchActivityDefaultPref: function _setSearchActivityDefaultPref(
-    engine
-  ) {
-    SharedPreferences.forApp().setCharPref(
-      this.PREF_SEARCH_ACTIVITY_ENGINE_KEY,
-      engine.name
-    );
-  },
-
-  // Display context menu listing names of the search engines available to be added.
-  displaySearchEnginesList: function displaySearchEnginesList(data) {
-    let tab = BrowserApp.getTabForId(data.tabId);
-
-    if (!tab) {
-      return;
-    }
-
-    let browser = tab.browser;
-    let engines = browser.engines;
-
-    let p = new Prompt({
-      window: browser.contentWindow,
-    })
-      .setSingleChoiceItems(
-        engines.map(function(e) {
-          return { label: e.title };
-        })
-      )
-      .show(data => {
-        if (data.button == -1) {
-          return;
-        }
-
-        this.addOpenSearchEngine(engines[data.button]);
-        engines.splice(data.button, 1);
-
-        if (engines.length < 1) {
-          // Broadcast message that there are no more add-able search engines.
-          let newEngineMessage = {
-            type: "Link:OpenSearch",
-            tabID: tab.id,
-            visible: false,
-          };
-
-          GlobalEventDispatcher.sendRequest(newEngineMessage);
-        }
-      });
-  },
-
-  addOpenSearchEngine: async function addOpenSearchEngine(engine) {
-    try {
-      await Services.search.addEngine(engine.url, engine.iconURL, false);
-      // Display a toast confirming addition of new search engine.
-      Snackbars.show(
-        Strings.browser.formatStringFromName("alertSearchEngineAddedToast", [
-          engine.title,
-        ]),
-        Snackbars.LENGTH_LONG
-      );
-    } catch (ex) {
-      let code = ex.result;
-      let errorMessage;
-      if (code == 2) {
-        // Engine is a duplicate.
-        errorMessage = "alertSearchEngineDuplicateToast";
-      } else {
-        // Unknown failure. Display general error message.
-        errorMessage = "alertSearchEngineErrorToast";
-      }
-
-      Snackbars.show(
-        Strings.browser.formatStringFromName(errorMessage, [engine.title]),
-        Snackbars.LENGTH_LONG
-      );
-    }
-  },
-
-  /**
-   * Build and return an array of sorted form data / Query Parameters
-   * for an element in a submission form.
-   *
-   * @param element
-   *        A valid submission element of a form.
-   */
-  _getSortedFormData: function(element) {
-    let formData = [];
-
-    for (let formElement of element.form.elements) {
-      if (!formElement.type) {
-        continue;
-      }
-
-      // Make this text field a generic search parameter.
-      if (element == formElement) {
-        formData.push({ name: formElement.name, value: "{searchTerms}" });
-        continue;
-      }
-
-      // Add other form elements as parameters.
-      switch (formElement.type.toLowerCase()) {
-        case "checkbox":
-        case "radio":
-          if (!formElement.checked) {
-            break;
-          }
-        case "text":
-        case "hidden":
-        case "textarea":
-          formData.push({
-            name: escape(formElement.name),
-            value: escape(formElement.value),
-          });
-          break;
-
-        case "select-one": {
-          for (let option of formElement.options) {
-            if (option.selected) {
-              formData.push({
-                name: escape(formElement.name),
-                value: escape(formElement.value),
-              });
-              break;
-            }
-          }
-        }
-      }
-    }
-
-    // Return valid, pre-sorted queryParams.
-    return formData
-      .filter(a => a.name && a.value)
-      .sort((a, b) => {
-        // nsISearchService.hasEngineWithURL() ensures sort, but this helps.
-        if (a.name > b.name) {
-          return 1;
-        }
-        if (b.name > a.name) {
-          return -1;
-        }
-
-        if (a.value > b.value) {
-          return 1;
-        }
-        if (b.value > a.value) {
-          return -1;
-        }
-
-        return 0;
-      });
-  },
-
-  /**
-   * Check if any search engines already handle an EngineURL of type
-   * URLTYPE_SEARCH_HTML, matching this request-method, formURL, and queryParams.
-   */
-  visibleEngineExists: function(element) {
-    let formData = this._getSortedFormData(element);
-
-    let form = element.form;
-    let method = form.method.toUpperCase();
-
-    let charset = element.ownerDocument.characterSet;
-    let docURI = Services.io.newURI(element.ownerDocument.URL, charset);
-    let formURL = Services.io.newURI(
-      form.getAttribute("action"),
-      charset,
-      docURI
-    ).spec;
-
-    return Services.search.hasEngineWithURL(method, formURL, formData);
-  },
-
-  /**
-   * Adds a new search engine to the SearchService, based on its provided element. Prompts for an engine
-   * name, and appends a simple version-number in case of collision with an existing name.
-   *
-   * @return callback to handle success value. Currently used for ActionBarHandler.js and UI updates.
-   */
-  addEngine: function addEngine(aElement, resultCallback) {
-    let form = aElement.form;
-    let charset = aElement.ownerDocument.characterSet;
-    let docURI = Services.io.newURI(aElement.ownerDocument.URL, charset);
-    let formURL = Services.io.newURI(
-      form.getAttribute("action"),
-      charset,
-      docURI
-    ).spec;
-    let method = form.method.toUpperCase();
-    let formData = this._getSortedFormData(aElement);
-
-    // prompt user for name of search engine
-    let promptTitle = Strings.browser.GetStringFromName(
-      "contextmenu.addSearchEngine3"
-    );
-    let title = { value: aElement.ownerDocument.title || docURI.displayHost };
-    if (!Services.prompt.prompt(null, promptTitle, null, title, null, {})) {
-      if (resultCallback) {
-        resultCallback(false);
-      }
-      return;
-    }
-
-    Services.search.init().then(function addEngine_cb(rv) {
-      if (!Components.isSuccessCode(rv)) {
-        Cu.reportError("Could not initialize search service, bailing out.");
-        if (resultCallback) {
-          resultCallback(false);
-        }
-        return;
-      }
-
-      GlobalEventDispatcher.sendRequestForResult({
-        type: "Favicon:Request",
-        url: docURI.spec,
-        skipNetwork: false,
-      })
-        .then(async data => {
-          // if there's already an engine with this name, add a number to
-          // make the name unique (e.g., "Google" becomes "Google 2")
-          let name = title.value;
-          for (let i = 2; Services.search.getEngineByName(name); i++) {
-            name = title.value + " " + i;
-          }
-
-          await Services.search.addEngineWithDetails(name, {
-            iconURL: data,
-            method,
-            template: formURL,
-          });
-          Snackbars.show(
-            Strings.browser.formatStringFromName(
-              "alertSearchEngineAddedToast",
-              [name]
-            ),
-            Snackbars.LENGTH_LONG
-          );
-
-          let engine = Services.search.getEngineByName(name);
-          engine.wrappedJSObject._queryCharset = charset;
-          formData.forEach(param => {
-            engine.addParam(param.name, param.value, null);
-          });
-
-          if (resultCallback) {
-            return resultCallback(true);
-          }
-        })
-        .catch(e => {
-          dump("Error while fetching icon for search engine");
-
-          resultCallback(false);
-        });
-    });
-  },
-};
-
-var ActivityObserver = {
-  init: function ao_init() {
-    Services.obs.addObserver(this, "application-background");
-    Services.obs.addObserver(this, "application-foreground");
-  },
-
-  observe: function ao_observe(aSubject, aTopic, aData) {
-    let isForeground = false;
-    let tab = BrowserApp.selectedTab;
-
-    UITelemetry.addEvent("show.1", "system", null, aTopic);
-
-    switch (aTopic) {
-      case "application-background":
-        let doc = tab ? tab.browser.contentDocument : null;
-        if (doc && doc.fullscreenElement) {
-          doc.exitFullscreen();
-        }
-        isForeground = false;
-        break;
-      case "application-foreground":
-        isForeground = true;
-        break;
-    }
-
-    if (tab && tab.getActive() != isForeground) {
-      tab.setActive(isForeground);
-    }
-  },
-};
-
-var Telemetry = {
-  addData: function addData(aHistogramId, aValue) {
-    let histogram = Services.telemetry.getHistogramById(aHistogramId);
-    histogram.add(aValue);
-  },
-};
-
-var Experiments = {
-  // Enable malware download protection (bug 936041)
-  MALWARE_DOWNLOAD_PROTECTION: "malware-download-protection",
-
-  // Try to load pages from disk cache when network is offline (bug 935190)
-  OFFLINE_CACHE: "offline-cache",
-
-  init() {
-    GlobalEventDispatcher.sendRequestForResult({
-      type: "Experiments:GetActive",
-    }).then(names => {
-      for (let name of names) {
-        switch (name) {
-          case this.MALWARE_DOWNLOAD_PROTECTION: {
-            // Apply experiment preferences on the default branch. This allows
-            // us to avoid migrating user prefs when experiments are enabled/disabled,
-            // and it also allows users to override these prefs in about:config.
-            let defaults = Services.prefs.getDefaultBranch(null);
-            defaults.setBoolPref(
-              "browser.safebrowsing.downloads.enabled",
-              true
-            );
-            defaults.setBoolPref(
-              "browser.safebrowsing.downloads.remote.enabled",
-              true
-            );
-            continue;
-          }
-
-          case this.OFFLINE_CACHE: {
-            let defaults = Services.prefs.getDefaultBranch(null);
-            defaults.setBoolPref("browser.tabs.useCache", true);
-            continue;
-          }
-        }
-      }
-    });
-  },
-
-  setOverride(name, isEnabled) {
-    GlobalEventDispatcher.sendRequest({
-      type: "Experiments:SetOverride",
-      name: name,
-      isEnabled: isEnabled,
-    });
-  },
-
-  clearOverride(name) {
-    GlobalEventDispatcher.sendRequest({
-      type: "Experiments:ClearOverride",
-      name: name,
-    });
-  },
-};
-
-var ExternalApps = {
-  _contextMenuId: null,
-
-  // extend _getLink to pickup html5 media links.
-  _getMediaLink: function(aElement) {
-    let uri = NativeWindow.contextmenus._getLink(aElement);
-    if (
-      uri == null &&
-      (ChromeUtils.getClassName(aElement) === "HTMLVideoElement" ||
-        ChromeUtils.getClassName(aElement) === "HTMLAudioElement")
-    ) {
-      try {
-        let mediaSrc = aElement.currentSrc || aElement.src;
-        uri = ContentAreaUtils.makeURI(mediaSrc, null, null);
-      } catch (e) {}
-    }
-    return uri;
-  },
-
-  init: function helper_init() {
-    this._contextMenuId = NativeWindow.contextmenus.add(
-      function(aElement) {
-        let uri = null;
-        var node = aElement;
-        while (node && !uri) {
-          uri = ExternalApps._getMediaLink(node);
-          node = node.parentNode;
-        }
-        let apps = [];
-        if (uri) {
-          apps = HelperApps.getAppsForUri(uri);
-        }
-
-        return apps.length == 1
-          ? Strings.browser.formatStringFromName("helperapps.openWithApp2", [
-              apps[0].name,
-            ])
-          : Strings.browser.GetStringFromName("helperapps.openWithList2");
-      },
-      this.filter,
-      this.openExternal
-    );
-  },
-
-  filter: {
-    matches: function(aElement) {
-      if (
-        !Services.prefs.getBoolPref("network.protocol-handler.external-default")
-      ) {
-        return false;
-      }
-
-      let uri = ExternalApps._getMediaLink(aElement);
-      let apps = [];
-      if (uri) {
-        apps = HelperApps.getAppsForUri(uri);
-      }
-      return apps.length > 0;
-    },
-  },
-
-  openExternal: function(aElement) {
-    if (aElement.pause) {
-      aElement.pause();
-    }
-    let uri = ExternalApps._getMediaLink(aElement);
-    HelperApps.launchUri(uri);
-  },
-
-  shouldCheckUri: function(uri) {
-    if (
-      !(uri.schemeIs("http") || uri.schemeIs("https") || uri.schemeIs("file"))
-    ) {
-      return false;
-    }
-
-    return true;
-  },
-
-  updatePageAction: function updatePageAction(uri, contentDocument) {
-    HelperApps.getAppsForUri(uri, { filterHttp: true }, apps => {
-      this.clearPageAction();
-      if (apps.length > 0) {
-        this._setUriForPageAction(uri, apps, contentDocument);
-      }
-    });
-  },
-
-  updatePageActionUri: function updatePageActionUri(uri) {
-    this._pageActionUri = uri;
-  },
-
-  _getMediaContentElement(contentDocument) {
-    if (
-      !contentDocument.contentType.startsWith("video/") &&
-      !contentDocument.contentType.startsWith("audio/")
-    ) {
-      return null;
-    }
-
-    let element = contentDocument.activeElement;
-
-    if (element instanceof HTMLBodyElement) {
-      element = element.firstChild;
-    }
-
-    if (element instanceof HTMLMediaElement) {
-      return element;
-    }
-
-    return null;
-  },
-
-  _setUriForPageAction: function setUriForPageAction(
-    uri,
-    apps,
-    contentDocument
-  ) {
-    this.updatePageActionUri(uri);
-
-    // If the pageaction is already added, simply update the URI to be launched when 'onclick' is triggered.
-    if (this._pageActionId != undefined) {
-      return;
-    }
-
-    let mediaElement = this._getMediaContentElement(contentDocument);
-
-    this._pageActionId = PageActions.add({
-      title: Strings.browser.GetStringFromName("openInApp.pageAction"),
-      icon: "drawable://icon_openinapp",
-      useTint: true,
-
-      clickCallback: () => {
-        UITelemetry.addEvent("launch.1", "pageaction", null, "helper");
-
-        let wasPlaying =
-          mediaElement && !mediaElement.paused && !mediaElement.ended;
-        if (wasPlaying) {
-          mediaElement.pause();
-        }
-
-        if (apps.length > 1) {
-          // Use the HelperApps prompt here to filter out any Http handlers
-          HelperApps.prompt(
-            apps,
-            {
-              window: window,
-              title: Strings.browser.GetStringFromName("openInApp.pageAction"),
-              buttons: [
-                Strings.browser.GetStringFromName("openInApp.ok"),
-                Strings.browser.GetStringFromName("openInApp.cancel"),
-              ],
-              // Support double tapping to launch an app
-              doubleTapButton: 0,
-            },
-            result => {
-              if (result.button != 0) {
-                if (wasPlaying) {
-                  mediaElement.play();
-                }
-
-                return;
-              }
-              apps[result.icongrid0].launch(this._pageActionUri);
-            }
-          );
-        } else {
-          apps[0].launch(this._pageActionUri);
-        }
-      },
-    });
-  },
-
-  clearPageAction: function clearPageAction() {
-    if (!this._pageActionId) {
-      return;
-    }
-
-    PageActions.remove(this._pageActionId);
-    delete this._pageActionId;
-  },
-};
-
-var Distribution = {
-  // File used to store campaign data
-  _file: null,
-
-  _preferencesJSON: null,
-
-  init: function dc_init() {
-    GlobalEventDispatcher.registerListener(this, [
-      "Campaign:Set",
-      "Distribution:Changed",
-      "Distribution:Set",
-    ]);
-    Services.obs.addObserver(this, "prefservice:after-app-defaults");
-
-    // Look for file outside the APK:
-    // /data/data/org.mozilla.xxx/distribution.json
-    this._file = Services.dirsvc.get("XCurProcD", Ci.nsIFile);
-    this._file.append("distribution.json");
-    this.readJSON(this._file, this.update);
-  },
-
-  onEvent: function dc_onEvent(event, data, callback) {
-    switch (event) {
-      case "Campaign:Set": {
-        // Update the prefs for this session
-        try {
-          this.update(data);
-        } catch (ex) {
-          Cu.reportError("Distribution: Could not parse JSON: " + ex);
-          return;
-        }
-
-        // Asynchronously copy the data to the file.
-        let array = new TextEncoder().encode(JSON.stringify(data));
-        OS.File.writeAtomic(this._file.path, array, {
-          tmpPath: this._file.path + ".tmp",
-        });
-        break;
-      }
-
-      case "Distribution:Changed":
-        // Re-init the search service.
-        try {
-          Services.search._reInit();
-        } catch (e) {
-          console.log("Unable to reinit search service.");
-        }
-      // Fall through.
-
-      case "Distribution:Set":
-        if (data) {
-          try {
-            this._preferencesJSON = JSON.parse(data.preferences);
-          } catch (e) {
-            console.log("Invalid distribution JSON.");
-          }
-        }
-        // Reload the default prefs so we can observe "prefservice:after-app-defaults"
-        Services.prefs
-          .QueryInterface(Ci.nsIObserver)
-          .observe(null, "reload-default-prefs", null);
-        this.installDistroAddons();
-        break;
-    }
-  },
-
-  observe: function dc_observe(aSubject, aTopic, aData) {
-    switch (aTopic) {
-      case "prefservice:after-app-defaults":
-        this.getPrefs();
-        break;
-    }
-  },
-
-  update: function dc_update(aData) {
-    // Force the distribution preferences on the default branch
-    let defaults = Services.prefs.getDefaultBranch(null);
-    defaults.setCharPref("distribution.id", aData.id);
-    defaults.setCharPref("distribution.version", aData.version);
-  },
-
-  getPrefs: function dc_getPrefs() {
-    if (this._preferencesJSON) {
-      this.applyPrefs(this._preferencesJSON);
-      this._preferencesJSON = null;
-      return;
-    }
-
-    // Get the distribution directory, and bail if it doesn't exist.
-    let file = FileUtils.getDir("XREAppDist", [], false);
-    if (!file.exists()) {
-      return;
-    }
-
-    file.append("preferences.json");
-    this.readJSON(file, this.applyPrefs);
-  },
-
-  applyPrefs: function dc_applyPrefs(aData) {
-    // Check for required Global preferences
-    let global = aData.Global;
-    if (!(global && global.id && global.version && global.about)) {
-      Cu.reportError("Distribution: missing or incomplete Global preferences");
-      return;
-    }
-
-    // Force the distribution preferences on the default branch
-    let defaults = Services.prefs.getDefaultBranch(null);
-    defaults.setCharPref("distribution.id", global.id);
-    defaults.setCharPref("distribution.version", global.version);
-
-    let locale = BrowserApp.getUALocalePref();
-    defaults.setStringPref(
-      "distribution.about",
-      global["about." + locale] || global.about
-    );
-
-    let prefs = aData.Preferences;
-    for (let key in prefs) {
-      try {
-        let value = prefs[key];
-        switch (typeof value) {
-          case "boolean":
-            defaults.setBoolPref(key, value);
-            break;
-          case "number":
-            defaults.setIntPref(key, value);
-            break;
-          case "string":
-          case "undefined":
-            defaults.setCharPref(key, value);
-            break;
-        }
-      } catch (e) {
-        /* ignore bad prefs and move on */
-      }
-    }
-
-    let localizedString = Cc[
-      "@mozilla.org/pref-localizedstring;1"
-    ].createInstance(Ci.nsIPrefLocalizedString);
-    let localizeablePrefs = aData.LocalizablePreferences;
-    for (let key in localizeablePrefs) {
-      try {
-        let value = localizeablePrefs[key];
-        value = value.replace(/%LOCALE%/g, locale);
-        localizedString.data = "data:text/plain," + key + "=" + value;
-        defaults.setComplexValue(
-          key,
-          Ci.nsIPrefLocalizedString,
-          localizedString
-        );
-      } catch (e) {
-        /* ignore bad prefs and move on */
-      }
-    }
-
-    let localizeablePrefsOverrides = aData["LocalizablePreferences." + locale];
-    for (let key in localizeablePrefsOverrides) {
-      try {
-        let value = localizeablePrefsOverrides[key];
-        localizedString.data = "data:text/plain," + key + "=" + value;
-        defaults.setComplexValue(
-          key,
-          Ci.nsIPrefLocalizedString,
-          localizedString
-        );
-      } catch (e) {
-        /* ignore bad prefs and move on */
-      }
-    }
-
-    GlobalEventDispatcher.sendRequest({ type: "Distribution:Set:OK" });
-  },
-
-  // aFile is an nsIFile
-  // aCallback takes the parsed JSON object as a parameter
-  readJSON: function dc_readJSON(aFile, aCallback) {
-    (async () => {
-      try {
-        let bytes = await OS.File.read(aFile.path);
-        let raw = new TextDecoder().decode(bytes) || "";
-      } catch (e) {
-        if (!(e instanceof OS.File.Error && e.becauseNoSuchFile)) {
-          Cu.reportError(
-            "Distribution: Could not read from " + aFile.leafName + " file"
-          );
-        }
-        return;
-      }
-
-      try {
-        aCallback(JSON.parse(raw));
-      } catch (e) {
-        Cu.reportError("Distribution: Could not parse JSON: " + e);
-      }
-    })();
-  },
-
-  // Track pending installs so we can avoid showing notifications for them.
-  pendingAddonInstalls: new Set(),
-
-  async installDistroAddons() {
-    const PREF_ADDONS_INSTALLED = "distribution.addonsInstalled";
-    try {
-      let installed = Services.prefs.getBoolPref(PREF_ADDONS_INSTALLED);
-      if (installed) {
-        return;
-      }
-    } catch (e) {
-      Services.prefs.setBoolPref(PREF_ADDONS_INSTALLED, true);
-    }
-
-    let distroPath;
-    try {
-      distroPath = FileUtils.getDir("XREAppDist", ["extensions"]).path;
-
-      let info = await OS.File.stat(distroPath);
-      if (!info.isDir) {
-        return;
-      }
-    } catch (e) {
-      return;
-    }
-
-    let it = new OS.File.DirectoryIterator(distroPath);
-    try {
-      await it.forEach(entry => {
-        // Only support extensions that are zipped in .xpi files.
-        if (entry.isDir || !entry.name.endsWith(".xpi")) {
-          dump("Ignoring distribution add-on that isn't an XPI: " + entry.path);
-          return;
-        }
-
-        AddonManager.getInstallForFile(new FileUtils.File(entry.path), null, {
-          source: "distribution",
-        })
-          .then(install => {
-            let id = entry.name.substring(0, entry.name.length - 4);
-            if (install.addon.id !== id) {
-              Cu.reportError(
-                "File entry " +
-                  entry.path +
-                  " contains an add-on with an incorrect ID"
-              );
-              return;
-            }
-            this.pendingAddonInstalls.add(install);
-            install.install();
-          })
-          .catch(e => {
-            Cu.reportError(
-              "Error installing distribution add-on: " + entry.path + ": " + e
-            );
-          });
-      });
-    } finally {
-      it.close();
-    }
-  },
-};
-
-var Tabs = {
-  _enableTabExpiration: false,
-  _useCache: false,
-  _domains: new Set(),
-
-  init: function() {
-    // On low-memory platforms, always allow tab expiration. On high-mem
-    // platforms, allow it to be turned on once we hit a low-mem situation.
-    if (BrowserApp.isOnLowMemoryPlatform) {
-      this._enableTabExpiration = true;
-    } else {
-      Services.obs.addObserver(this, "memory-pressure");
-    }
-
-    GlobalEventDispatcher.registerListener(this, [
-      // Watch for opportunities to pre-connect to high probability targets.
-      "Session:Prefetch",
-    ]);
-
-    // Track the network connection so we can efficiently use the cache
-    // for possible offline rendering.
-    Services.obs.addObserver(this, "network:link-status-changed");
-    let network = Cc["@mozilla.org/network/network-link-service;1"].getService(
-      Ci.nsINetworkLinkService
-    );
-    this.useCache = !network.isLinkUp;
-
-    BrowserApp.deck.addEventListener("pageshow", this);
-    BrowserApp.deck.addEventListener("TabOpen", this);
-  },
-
-  onEvent: function(event, data, callback) {
-    switch (event) {
-      case "Session:Prefetch":
-        if (!data.url) {
-          break;
-        }
-        try {
-          let uri = Services.io.newURI(data.url);
-          if (uri && !this._domains.has(uri.host)) {
-            Services.io
-              .QueryInterface(Ci.nsISpeculativeConnect)
-              .speculativeConnect(
-                uri,
-                BrowserApp.selectedBrowser.contentDocument.nodePrincipal,
-                null
-              );
-            this._domains.add(uri.host);
-          }
-        } catch (e) {}
-        break;
-    }
-  },
-
-  observe: function(aSubject, aTopic, aData) {
-    switch (aTopic) {
-      case "memory-pressure":
-        if (aData != "heap-minimize") {
-          // We received a low-memory related notification. This will enable
-          // expirations.
-          this._enableTabExpiration = true;
-          Services.obs.removeObserver(this, "memory-pressure");
-        } else {
-          // Use "heap-minimize" as a trigger to expire the most stale tab.
-          this.expireLruTab();
-        }
-        break;
-      case "network:link-status-changed":
-        if (!["down", "unknown", "up"].includes(aData)) {
-          return;
-        }
-        this.useCache = aData === "down";
-        break;
-    }
-  },
-
-  handleEvent: function(aEvent) {
-    switch (aEvent.type) {
-      case "pageshow":
-        // Clear the domain cache whenever a page is loaded into any browser.
-        this._domains.clear();
-
-        break;
-      case "TabOpen":
-        // Use opening a new tab as a trigger to expire the most stale tab.
-        this.expireLruTab();
-        break;
-    }
-  },
-
-  // Manage the most-recently-used list of tabs. Each tab has a timestamp
-  // associated with it that indicates when it was last touched.
-  expireLruTab: function() {
-    if (!this._enableTabExpiration) {
-      return false;
-    }
-    let expireTimeMs =
-      Services.prefs.getIntPref("browser.tabs.expireTime") * 1000;
-    if (expireTimeMs < 0) {
-      // This behaviour is disabled.
-      return false;
-    }
-    let tabs = BrowserApp.tabs;
-    let selected = BrowserApp.selectedTab;
-    let lruTab = null;
-    // Find the least recently used non-zombie tab.
-    for (let i = 0; i < tabs.length; i++) {
-      if (
-        tabs[i] == selected ||
-        tabs[i].browser.__SS_restore ||
-        tabs[i].playingAudio
-      ) {
-        // This tab is selected, is already a zombie, or is currently playing
-        // audio, skip it.
-        continue;
-      }
-      if (lruTab == null || tabs[i].lastTouchedAt < lruTab.lastTouchedAt) {
-        lruTab = tabs[i];
-      }
-    }
-    // If the tab was last touched more than browser.tabs.expireTime seconds ago,
-    // zombify it.
-    if (lruTab) {
-      if (Date.now() - lruTab.lastTouchedAt > expireTimeMs) {
-        lruTab.zombify();
-        return true;
-      }
-    }
-    return false;
-  },
-
-  get useCache() {
-    if (!Services.prefs.getBoolPref("browser.tabs.useCache")) {
-      return false;
-    }
-    return this._useCache;
-  },
-
-  set useCache(aUseCache) {
-    if (!Services.prefs.getBoolPref("browser.tabs.useCache")) {
-      return;
-    }
-
-    if (this._useCache == aUseCache) {
-      return;
-    }
-
-    BrowserApp.tabs.forEach(function(tab) {
-      if (tab.browser && tab.browser.docShell) {
-        if (aUseCache) {
-          tab.browser.docShell.defaultLoadFlags |=
-            Ci.nsIRequest.LOAD_FROM_CACHE;
-        } else {
-          tab.browser.docShell.defaultLoadFlags &= ~Ci.nsIRequest
-            .LOAD_FROM_CACHE;
-        }
-      }
-    });
-    this._useCache = aUseCache;
-  },
-
-  // For debugging
-  dump: function(aPrefix) {
-    let tabs = BrowserApp.tabs;
-    for (let i = 0; i < tabs.length; i++) {
-      dump(
-        aPrefix +
-          " | " +
-          "Tab [" +
-          tabs[i].browser.contentWindow.location.href +
-          "]: lastTouchedAt:" +
-          tabs[i].lastTouchedAt +
-          ", zombie:" +
-          tabs[i].browser.__SS_restore
-      );
-    }
-  },
-};
-
-function ContextMenuItem(args) {
-  this.id = ContextMenuItem._nextId;
-  this.args = args;
-
-  // Limit to Java int range.
-  ContextMenuItem._nextId = (ContextMenuItem._nextId + 1) & 0x7fffffff;
-}
-
-ContextMenuItem._nextId = 1;
-
-ContextMenuItem.prototype = {
-  get order() {
-    return this.args.order || 0;
-  },
-
-  matches: function(elt, x, y) {
-    return this.args.selector.matches(elt, x, y);
-  },
-
-  callback: function(elt) {
-    this.args.callback(elt);
-  },
-
-  addVal: function(name, elt, defaultValue) {
-    if (!(name in this.args)) {
-      return defaultValue;
-    }
-
-    if (typeof this.args[name] == "function") {
-      return this.args[name](elt);
-    }
-
-    return this.args[name];
-  },
-
-  getValue: function(elt) {
-    return {
-      id: this.id,
-      label: this.addVal("label", elt),
-      showAsActions: this.addVal("showAsActions", elt),
-      icon: this.addVal("icon", elt),
-      isGroup: this.addVal("isGroup", elt, false),
-      inGroup: this.addVal("inGroup", elt, false),
-      disabled: this.addVal("disabled", elt, false),
-      selected: this.addVal("selected", elt, false),
-      isParent: this.addVal("isParent", elt, false),
-    };
-  },
-};
-
-function HTMLContextMenuItem(elt, target) {
-  ContextMenuItem.call(this, {});
-
-  this.menuElementRef = Cu.getWeakReference(elt);
-  this.targetElementRef = Cu.getWeakReference(target);
-}
-
-HTMLContextMenuItem.prototype = Object.create(ContextMenuItem.prototype, {
-  order: {
-    value: NativeWindow.contextmenus.DEFAULT_HTML5_ORDER,
-  },
-
-  matches: {
-    value: function(target) {
-      let t = this.targetElementRef.get();
-      return t === target;
-    },
-  },
-
-  callback: {
-    value: function(target) {
-      let elt = this.menuElementRef.get();
-      if (!elt) {
-        return;
-      }
-
-      // If this is a menu item, show a new context menu with the submenu in it
-      if (elt instanceof HTMLMenuElement) {
-        try {
-          NativeWindow.contextmenus.menus = {};
-
-          let elt = this.menuElementRef.get();
-          let target = this.targetElementRef.get();
-          if (!elt) {
-            return;
-          }
-
-          var items = NativeWindow.contextmenus._getHTMLContextMenuItemsForMenu(
-            elt,
-            target
-          );
-          // This menu will always only have one context, but we still make sure its the "right" one.
-          var context = NativeWindow.contextmenus._getContextType(target);
-          if (items.length > 0) {
-            NativeWindow.contextmenus._addMenuItems(items, context);
-          }
-        } catch (ex) {
-          Cu.reportError(ex);
-        }
-      } else {
-        // otherwise just click the menu item
-        elt.click();
-      }
-    },
-  },
-
-  getValue: {
-    value: function(target) {
-      let elt = this.menuElementRef.get();
-      if (!elt) {
-        return null;
-      }
-
-      if (elt.hasAttribute("hidden")) {
-        return null;
-      }
-
-      return {
-        id: this.id,
-        icon: elt.icon,
-        label: elt.label,
-        disabled: elt.disabled,
-        menu: elt instanceof HTMLMenuElement,
-      };
-    },
-  },
-});
diff --git a/mobile/android/chrome/content/browser.xul b/mobile/android/chrome/content/browser.xul
deleted file mode 100644
index 8072a7a1c6e5..000000000000
--- a/mobile/android/chrome/content/browser.xul
+++ /dev/null
@@ -1,17 +0,0 @@
-<?xml version="1.0"?>
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-
-<?xml-stylesheet href="chrome://browser/content/browser.css" type="text/css"?>
-
-<window id="main-window"
-        onload="BrowserApp.startup();"
-        windowtype="navigator:browser"
-        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
-
-  <script type="application/javascript" src="chrome://browser/content/browser.js"/>
-
-  <deck id="browsers" flex="1"/>
-
-</window>
diff --git a/mobile/android/chrome/content/content.js b/mobile/android/chrome/content/content.js
deleted file mode 100644
index fba3599f77f7..000000000000
--- a/mobile/android/chrome/content/content.js
+++ /dev/null
@@ -1,637 +0,0 @@
-/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-var { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
-var { XPCOMUtils } = ChromeUtils.import(
-  "resource://gre/modules/XPCOMUtils.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "AboutReader",
-  "resource://gre/modules/AboutReader.jsm"
-);
-ChromeUtils.defineModuleGetter(
-  this,
-  "ReaderMode",
-  "resource://gre/modules/ReaderMode.jsm"
-);
-ChromeUtils.defineModuleGetter(
-  this,
-  "Readerable",
-  "resource://gre/modules/Readerable.jsm"
-);
-
-XPCOMUtils.defineLazyGetter(this, "gPipNSSBundle", function() {
-  return Services.strings.createBundle(
-    "chrome://pipnss/locale/pipnss.properties"
-  );
-});
-XPCOMUtils.defineLazyGetter(this, "gNSSErrorsBundle", function() {
-  return Services.strings.createBundle(
-    "chrome://pipnss/locale/nsserrors.properties"
-  );
-});
-
-var dump = ChromeUtils.import(
-  "resource://gre/modules/AndroidLog.jsm",
-  {}
-).AndroidLog.d.bind(null, "Content");
-
-var global = this;
-
-var AboutBlockedSiteListener = {
-  init(chromeGlobal) {
-    addEventListener("AboutBlockedLoaded", this, false, true);
-  },
-
-  get isBlockedSite() {
-    return content.document.documentURI.startsWith("about:blocked");
-  },
-
-  handleEvent(aEvent) {
-    if (!this.isBlockedSite) {
-      return;
-    }
-
-    if (aEvent.type != "AboutBlockedLoaded") {
-      return;
-    }
-
-    let provider = "";
-    if (docShell.failedChannel) {
-      let classifiedChannel = docShell.failedChannel.QueryInterface(
-        Ci.nsIClassifiedChannel
-      );
-      if (classifiedChannel) {
-        provider = classifiedChannel.matchedProvider;
-      }
-    }
-
-    let advisoryUrl = Services.prefs.getCharPref(
-      "browser.safebrowsing.provider." + provider + ".advisoryURL",
-      ""
-    );
-    if (!advisoryUrl) {
-      let el = content.document.getElementById("advisoryDesc");
-      el.remove();
-      return;
-    }
-
-    let advisoryLinkText = Services.prefs.getCharPref(
-      "browser.safebrowsing.provider." + provider + ".advisoryName",
-      ""
-    );
-    if (!advisoryLinkText) {
-      let el = content.document.getElementById("advisoryDesc");
-      el.remove();
-      return;
-    }
-
-    let anchorEl = content.document.getElementById("advisory_provider");
-    anchorEl.setAttribute("href", advisoryUrl);
-    anchorEl.textContent = advisoryLinkText;
-  },
-};
-AboutBlockedSiteListener.init();
-
-/* The following code, in particular AboutCertErrorListener and
- * AboutNetErrorListener, is mostly copied from content browser.js and content.js.
- * Certificate error handling should be unified to remove this duplicated code.
- */
-
-const SEC_ERROR_BASE = Ci.nsINSSErrorsService.NSS_SEC_ERROR_BASE;
-const MOZILLA_PKIX_ERROR_BASE = Ci.nsINSSErrorsService.MOZILLA_PKIX_ERROR_BASE;
-
-const SEC_ERROR_EXPIRED_CERTIFICATE = SEC_ERROR_BASE + 11;
-const SEC_ERROR_UNKNOWN_ISSUER = SEC_ERROR_BASE + 13;
-const SEC_ERROR_UNTRUSTED_ISSUER = SEC_ERROR_BASE + 20;
-const SEC_ERROR_UNTRUSTED_CERT = SEC_ERROR_BASE + 21;
-const SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE = SEC_ERROR_BASE + 30;
-const SEC_ERROR_CA_CERT_INVALID = SEC_ERROR_BASE + 36;
-const SEC_ERROR_OCSP_FUTURE_RESPONSE = SEC_ERROR_BASE + 131;
-const SEC_ERROR_OCSP_OLD_RESPONSE = SEC_ERROR_BASE + 132;
-const SEC_ERROR_REUSED_ISSUER_AND_SERIAL = SEC_ERROR_BASE + 138;
-const SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED = SEC_ERROR_BASE + 176;
-const MOZILLA_PKIX_ERROR_NOT_YET_VALID_CERTIFICATE =
-  MOZILLA_PKIX_ERROR_BASE + 5;
-const MOZILLA_PKIX_ERROR_NOT_YET_VALID_ISSUER_CERTIFICATE =
-  MOZILLA_PKIX_ERROR_BASE + 6;
-const MOZILLA_PKIX_ERROR_ADDITIONAL_POLICY_CONSTRAINT_FAILED =
-  MOZILLA_PKIX_ERROR_BASE + 13;
-
-const SSL_ERROR_BASE = Ci.nsINSSErrorsService.NSS_SSL_ERROR_BASE;
-const SSL_ERROR_SSL_DISABLED = SSL_ERROR_BASE + 20;
-const SSL_ERROR_SSL2_DISABLED = SSL_ERROR_BASE + 14;
-
-var AboutNetErrorListener = {
-  init(chromeGlobal) {
-    addEventListener("AboutNetErrorLoad", this, false, true);
-  },
-
-  get isNetErrorSite() {
-    return content.document.documentURI.startsWith("about:neterror");
-  },
-
-  _getErrorMessageFromCode(securityInfo, doc) {
-    let uri = Services.io.newURI(doc.location);
-    let hostString = uri.host;
-    if (uri.port != 443 && uri.port != -1) {
-      hostString += ":" + uri.port;
-    }
-
-    let id_str = "";
-    switch (securityInfo.errorCode) {
-      case SSL_ERROR_SSL_DISABLED:
-        id_str = "PSMERR_SSL_Disabled";
-        break;
-      case SSL_ERROR_SSL2_DISABLED:
-        id_str = "PSMERR_SSL2_Disabled";
-        break;
-      case SEC_ERROR_REUSED_ISSUER_AND_SERIAL:
-        id_str = "PSMERR_HostReusedIssuerSerial";
-        break;
-    }
-    let nss_error_id_str = securityInfo.errorCodeString;
-    let msg2 = "";
-    if (id_str) {
-      msg2 = gPipNSSBundle.GetStringFromName(id_str) + "\n";
-    } else if (nss_error_id_str) {
-      msg2 = gNSSErrorsBundle.GetStringFromName(nss_error_id_str) + "\n";
-    }
-
-    if (!msg2) {
-      // We couldn't get an error message. Use the error string.
-      // Note that this is different from before where we used PR_ErrorToString.
-      msg2 = nss_error_id_str;
-    }
-    let msg = gPipNSSBundle.formatStringFromName("SSLConnectionErrorPrefix2", [
-      hostString,
-      msg2,
-    ]);
-
-    if (nss_error_id_str) {
-      msg += gPipNSSBundle.formatStringFromName("certErrorCodePrefix3", [
-        nss_error_id_str,
-      ]);
-    }
-    return msg;
-  },
-
-  handleEvent(aEvent) {
-    if (!this.isNetErrorSite) {
-      return;
-    }
-
-    if (aEvent.type != "AboutNetErrorLoad") {
-      return;
-    }
-
-    let { securityInfo } = docShell.failedChannel;
-    // We don't have a securityInfo when this is for example a DNS error.
-    if (securityInfo) {
-      securityInfo.QueryInterface(Ci.nsITransportSecurityInfo);
-      let msg = this._getErrorMessageFromCode(
-        securityInfo,
-        aEvent.originalTarget.ownerGlobal
-      );
-      let id = content.document.getElementById("errorShortDescText");
-      id.textContent = msg;
-    }
-  },
-};
-AboutNetErrorListener.init();
-
-var AboutCertErrorListener = {
-  init(chromeGlobal) {
-    addEventListener("AboutCertErrorLoad", this, false, true);
-  },
-
-  get isCertErrorSite() {
-    return content.document.documentURI.startsWith("about:certerror");
-  },
-
-  _setTechDetailsMsgPart1(hostString, securityInfo, technicalInfo, doc) {
-    let msg = gPipNSSBundle.formatStringFromName("certErrorIntro", [
-      hostString,
-    ]);
-    msg += "\n\n";
-
-    if (securityInfo.isUntrusted && !securityInfo.serverCert.isSelfSigned) {
-      switch (securityInfo.errorCode) {
-        case SEC_ERROR_UNKNOWN_ISSUER:
-          msg +=
-            gPipNSSBundle.GetStringFromName("certErrorTrust_UnknownIssuer") +
-            "\n";
-          msg +=
-            gPipNSSBundle.GetStringFromName("certErrorTrust_UnknownIssuer2") +
-            "\n";
-          msg +=
-            gPipNSSBundle.GetStringFromName("certErrorTrust_UnknownIssuer3") +
-            "\n";
-          break;
-        case SEC_ERROR_CA_CERT_INVALID:
-          msg +=
-            gPipNSSBundle.GetStringFromName("certErrorTrust_CaInvalid") + "\n";
-          break;
-        case SEC_ERROR_UNTRUSTED_ISSUER:
-          msg +=
-            gPipNSSBundle.GetStringFromName("certErrorTrust_Issuer") + "\n";
-          break;
-        case SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED:
-          msg +=
-            gPipNSSBundle.GetStringFromName(
-              "certErrorTrust_SignatureAlgorithmDisabled"
-            ) + "\n";
-          break;
-        case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
-          msg +=
-            gPipNSSBundle.GetStringFromName("certErrorTrust_ExpiredIssuer") +
-            "\n";
-          break;
-        // This error code currently only exists for the Symantec distrust, we may need to adjust
-        // it to fit other distrusts later.
-        case MOZILLA_PKIX_ERROR_ADDITIONAL_POLICY_CONSTRAINT_FAILED:
-          msg +=
-            gPipNSSBundle.formatStringFromName("certErrorTrust_Symantec", [
-              hostString,
-            ]) + "\n";
-          break;
-        case SEC_ERROR_UNTRUSTED_CERT:
-        default:
-          msg +=
-            gPipNSSBundle.GetStringFromName("certErrorTrust_Untrusted") + "\n";
-      }
-    }
-    if (securityInfo.isUntrusted && securityInfo.serverCert.isSelfSigned) {
-      msg +=
-        gPipNSSBundle.GetStringFromName("certErrorTrust_SelfSigned") + "\n";
-    }
-
-    technicalInfo.appendChild(doc.createTextNode(msg));
-  },
-
-  _setTechDetails(securityInfo, location) {
-    if (!securityInfo || !location) {
-      return;
-    }
-    let validity = securityInfo.serverCert.validity;
-
-    let doc = content.document;
-    // CSS class and error code are set from nsDocShell.
-    let searchParams = new URLSearchParams(doc.documentURI.split("?")[1]);
-    let cssClass = searchParams.get("s");
-    let error = searchParams.get("e");
-    let technicalInfo = doc.getElementById("technicalContentText");
-
-    let uri = Services.io.newURI(location);
-    let hostString = uri.host;
-    if (uri.port != 443 && uri.port != -1) {
-      hostString += ":" + uri.port;
-    }
-
-    // This error code currently only exists for the Symantec distrust
-    // in Firefox 63, so we add copy explaining that to the user.
-    // In case of future distrusts of that scale we might need to add
-    // additional parameters that allow us to identify the affected party
-    // without replicating the complex logic from certverifier code.
-    if (
-      securityInfo.errorCode ==
-      MOZILLA_PKIX_ERROR_ADDITIONAL_POLICY_CONSTRAINT_FAILED
-    ) {
-      let introContent = doc.getElementById("introContent");
-      let description = doc.createElement("p");
-      description.textContent = gPipNSSBundle.formatStringFromName(
-        "certErrorSymantecDistrustDescription",
-        [hostString]
-      );
-      introContent.append(description);
-
-      // The regular "what should I do" message does not make sense in this case.
-      doc.getElementById(
-        "whatShouldIDoContentText"
-      ).textContent = gPipNSSBundle.GetStringFromName(
-        "certErrorSymantecDistrustAdministrator"
-      );
-    }
-
-    this._setTechDetailsMsgPart1(hostString, securityInfo, technicalInfo, doc);
-
-    if (securityInfo.isDomainMismatch) {
-      let subjectAltNamesList = securityInfo.serverCert.subjectAltNames;
-      let subjectAltNames = subjectAltNamesList.split(",");
-      let numSubjectAltNames = subjectAltNames.length;
-      let msgPrefix = "";
-      if (numSubjectAltNames != 0) {
-        if (numSubjectAltNames == 1) {
-          msgPrefix = gPipNSSBundle.GetStringFromName(
-            "certErrorMismatchSinglePrefix"
-          );
-
-          // Let's check if we want to make this a link.
-          let okHost = subjectAltNamesList;
-          let href = "";
-          let thisHost = doc.location.hostname;
-          let proto = doc.location.protocol + "//";
-          // If okHost is a wildcard domain ("*.example.com") let's
-          // use "www" instead.  "*.example.com" isn't going to
-          // get anyone anywhere useful. bug 432491
-          okHost = okHost.replace(/^\*\./, "www.");
-          /* case #1:
-           * example.com uses an invalid security certificate.
-           *
-           * The certificate is only valid for www.example.com
-           *
-           * Make sure to include the "." ahead of thisHost so that
-           * a MitM attack on paypal.com doesn't hyperlink to "notpaypal.com"
-           *
-           * We'd normally just use a RegExp here except that we lack a
-           * library function to escape them properly (bug 248062), and
-           * domain names are famous for having '.' characters in them,
-           * which would allow spurious and possibly hostile matches.
-           */
-          if (okHost.endsWith("." + thisHost)) {
-            href = proto + okHost;
-          }
-          /* case #2:
-           * browser.garage.maemo.org uses an invalid security certificate.
-           *
-           * The certificate is only valid for garage.maemo.org
-           */
-          if (thisHost.endsWith("." + okHost)) {
-            href = proto + okHost;
-          }
-
-          // If we set a link, meaning there's something helpful for
-          // the user here, expand the section by default
-          if (href && cssClass != "expertBadCert") {
-            doc.getElementById("technicalContentText").style.display = "block";
-          }
-
-          // Set the link if we want it.
-          if (href) {
-            let referrerlink = doc.createElement("a");
-            referrerlink.append(subjectAltNamesList + "\n");
-            referrerlink.title = subjectAltNamesList;
-            referrerlink.id = "cert_domain_link";
-            referrerlink.href = href;
-            let fragment = BrowserUtils.getLocalizedFragment(
-              doc,
-              msgPrefix,
-              referrerlink
-            );
-            technicalInfo.appendChild(fragment);
-          } else {
-            let fragment = BrowserUtils.getLocalizedFragment(
-              doc,
-              msgPrefix,
-              subjectAltNamesList
-            );
-            technicalInfo.appendChild(fragment);
-          }
-          technicalInfo.append("\n");
-        } else {
-          let msg =
-            gPipNSSBundle.GetStringFromName("certErrorMismatchMultiple") + "\n";
-          for (let i = 0; i < numSubjectAltNames; i++) {
-            msg += subjectAltNames[i];
-            if (i != numSubjectAltNames - 1) {
-              msg += ", ";
-            }
-          }
-          technicalInfo.append(msg + "\n");
-        }
-      } else {
-        let msg = gPipNSSBundle.formatStringFromName("certErrorMismatch", [
-          hostString,
-        ]);
-        technicalInfo.append(msg + "\n");
-      }
-    }
-
-    if (securityInfo.isNotValidAtThisTime) {
-      let nowTime = new Date().getTime() * 1000;
-      let dateOptions = {
-        year: "numeric",
-        month: "long",
-        day: "numeric",
-        hour: "numeric",
-        minute: "numeric",
-      };
-      let now = new Services.intl.DateTimeFormat(undefined, dateOptions).format(
-        new Date()
-      );
-      let msg = "";
-      if (validity.notBefore) {
-        if (nowTime > validity.notAfter) {
-          msg +=
-            gPipNSSBundle.formatStringFromName("certErrorExpiredNow", [
-              validity.notAfterLocalTime,
-              now,
-            ]) + "\n";
-        } else {
-          msg +=
-            gPipNSSBundle.formatStringFromName("certErrorNotYetValidNow", [
-              validity.notBeforeLocalTime,
-              now,
-            ]) + "\n";
-        }
-      } else {
-        // If something goes wrong, we assume the cert expired.
-        msg +=
-          gPipNSSBundle.formatStringFromName("certErrorExpiredNow", ["", now]) +
-          "\n";
-      }
-      technicalInfo.append(msg);
-    }
-    technicalInfo.append("\n");
-
-    // Add link to certificate and error message.
-    let errorCodeMsg = gPipNSSBundle.formatStringFromName(
-      "certErrorCodePrefix3",
-      [securityInfo.errorCodeString]
-    );
-    technicalInfo.append(errorCodeMsg);
-  },
-
-  handleEvent(aEvent) {
-    if (!this.isCertErrorSite) {
-      return;
-    }
-
-    if (aEvent.type != "AboutCertErrorLoad") {
-      return;
-    }
-
-    let ownerDoc = aEvent.originalTarget.ownerGlobal;
-    let securityInfo =
-      docShell.failedChannel && docShell.failedChannel.securityInfo;
-    securityInfo
-      .QueryInterface(Ci.nsITransportSecurityInfo)
-      .QueryInterface(Ci.nsISerializable);
-    this._setTechDetails(securityInfo, ownerDoc.location.href);
-  },
-};
-AboutCertErrorListener.init();
-
-// This is copied from desktop's tab-content.js. See bug 1153485 about sharing this code somehow.
-var AboutReaderListener = {
-  _articlePromise: null,
-
-  _isLeavingReaderableReaderMode: false,
-
-  init: function() {
-    addEventListener("AboutReaderContentLoaded", this, false, true);
-    addEventListener("DOMContentLoaded", this, false);
-    addEventListener("pageshow", this, false);
-    addEventListener("pagehide", this, false);
-    addMessageListener("Reader:ToggleReaderMode", this);
-    addMessageListener("Reader:PushState", this);
-  },
-
-  receiveMessage: function(message) {
-    switch (message.name) {
-      case "Reader:ToggleReaderMode":
-        let url = content.document.location.href;
-        if (!this.isAboutReader) {
-          this._articlePromise = ReaderMode.parseDocument(
-            content.document
-          ).catch(Cu.reportError);
-          ReaderMode.enterReaderMode(docShell, content);
-        } else {
-          this._isLeavingReaderableReaderMode = this.isReaderableAboutReader;
-          ReaderMode.leaveReaderMode(docShell, content);
-        }
-        break;
-
-      case "Reader:PushState":
-        this.updateReaderButton(!!(message.data && message.data.isArticle));
-        break;
-    }
-  },
-
-  get isAboutReader() {
-    return content.document.documentURI.startsWith("about:reader");
-  },
-
-  get isReaderableAboutReader() {
-    return (
-      this.isAboutReader && !content.document.documentElement.dataset.isError
-    );
-  },
-
-  get isErrorPage() {
-    return (
-      content.document.documentURI.startsWith("about:neterror") ||
-      content.document.documentURI.startsWith("about:certerror") ||
-      content.document.documentURI.startsWith("about:blocked")
-    );
-  },
-
-  handleEvent: function(aEvent) {
-    if (aEvent.originalTarget.defaultView != content) {
-      return;
-    }
-
-    switch (aEvent.type) {
-      case "AboutReaderContentLoaded":
-        if (!this.isAboutReader) {
-          return;
-        }
-
-        // If we are restoring multiple reader mode tabs during session restore, duplicate "DOMContentLoaded"
-        // events may be fired for the visible tab. The inital "DOMContentLoaded" may be received before the
-        // document body is available, so we avoid instantiating an AboutReader object, expecting that a
-        // valid message will follow. See bug 925983.
-        if (content.document.body) {
-          new AboutReader(global, content, this._articlePromise);
-          this._articlePromise = null;
-        }
-        break;
-
-      case "pagehide":
-        // this._isLeavingReaderableReaderMode is used here to keep the Reader Mode icon
-        // visible in the location bar when transitioning from reader-mode page
-        // back to the source page.
-        sendAsyncMessage("Reader:UpdateReaderButton", {
-          isArticle: this._isLeavingReaderableReaderMode,
-        });
-        if (this._isLeavingReaderableReaderMode) {
-          this._isLeavingReaderableReaderMode = false;
-        }
-        break;
-
-      case "pageshow":
-        // If a page is loaded from the bfcache, we won't get a "DOMContentLoaded"
-        // event, so we need to rely on "pageshow" in this case.
-        if (aEvent.persisted) {
-          this.updateReaderButton();
-        }
-        break;
-      case "DOMContentLoaded":
-        this.updateReaderButton();
-        break;
-    }
-  },
-  updateReaderButton: function(forceNonArticle) {
-    // Do not show Reader View icon on error pages (bug 1320900)
-    if (this.isErrorPage) {
-      sendAsyncMessage("Reader:UpdateReaderButton", { isArticle: false });
-    } else if (
-      !Readerable.isEnabledForParseOnLoad ||
-      this.isAboutReader ||
-      !(content.document instanceof content.HTMLDocument) ||
-      content.document.mozSyntheticDocument
-    ) {
-    } else {
-      this.scheduleReadabilityCheckPostPaint(forceNonArticle);
-    }
-  },
-
-  cancelPotentialPendingReadabilityCheck: function() {
-    if (this._pendingReadabilityCheck) {
-      removeEventListener("MozAfterPaint", this._pendingReadabilityCheck);
-      delete this._pendingReadabilityCheck;
-    }
-  },
-
-  scheduleReadabilityCheckPostPaint: function(forceNonArticle) {
-    if (this._pendingReadabilityCheck) {
-      // We need to stop this check before we re-add one because we don't know
-      // if forceNonArticle was true or false last time.
-      this.cancelPotentialPendingReadabilityCheck();
-    }
-    this._pendingReadabilityCheck = this.onPaintWhenWaitedFor.bind(
-      this,
-      forceNonArticle
-    );
-    addEventListener("MozAfterPaint", this._pendingReadabilityCheck);
-  },
-
-  onPaintWhenWaitedFor: function(forceNonArticle, event) {
-    // In non-e10s, we'll get called for paints other than ours, and so it's
-    // possible that this page hasn't been laid out yet, in which case we
-    // should wait until we get an event that does relate to our layout. We
-    // determine whether any of our content got painted by checking if there
-    // are any painted rects.
-    if (!event.clientRects.length) {
-      return;
-    }
-
-    Services.console.logStringMessage(`ON PAINT WHEN WAITED FOR\n`);
-    this.cancelPotentialPendingReadabilityCheck();
-
-    // Only send updates when there are articles; there's no point updating with
-    // |false| all the time.
-    if (Readerable.isProbablyReaderable(content.document)) {
-      sendAsyncMessage("Reader:UpdateReaderButton", { isArticle: true });
-    } else if (forceNonArticle) {
-      sendAsyncMessage("Reader:UpdateReaderButton", { isArticle: false });
-    }
-  },
-};
-AboutReaderListener.init();
-
-Services.obs.notifyObservers(this, "tab-content-frameloader-created");
diff --git a/mobile/android/chrome/content/languages.properties b/mobile/android/chrome/content/languages.properties
deleted file mode 100644
index 53d30d1259af..000000000000
--- a/mobile/android/chrome/content/languages.properties
+++ /dev/null
@@ -1,114 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-# LOCALIZATION NOTE: do not localize
-af=Afrikaans
-ak=Akan
-ar=عربي
-as=অসমীয়া
-ast-ES=Asturianu
-be=Беларуская
-bg=Български
-bn-BD=বাংলা (বাংলাদেশ)
-bn-IN=বাংলা (ভারত)
-br-FR=Brezhoneg
-ca=català
-ca-valencia=català (valencià)
-cs=Čeština
-cy=Cymraeg
-da=Dansk
-de=Deutsch
-de-AT=Deutsch (Österreich)
-de-CH=Deutsch (Schweiz)
-de-DE=Deutsch (Deutschland)
-el=Ελληνικά
-en-AU=English (Australian)
-en-CA=English (Canadian)
-en-GB=English (British)
-en-NZ=English (New Zealand)
-en-US=English (US)
-en-ZA=English (South African)
-eo=Esperanto
-es-AR=Español (de Argentina)
-es-CL=Español (de Chile)
-es-ES=Español (de España)
-es-MX=Español (de México)
-et=Eesti keel
-eu=Euskara
-fa=فارسی
-fi=suomi
-fr=Français
-fur-IT=Furlan
-fy-NL=Frysk
-ga-IE=Gaeilge
-gl=Galego
-gu-IN=ગુજરાતી
-he=עברית
-hi=हिन्दी
-hi-IN=हिन्दी (भारत)
-hr=Hrvatski
-hsb=Hornjoserbsce
-hu=Magyar
-hy-AM=Հայերեն
-id=Bahasa Indonesia
-is=íslenska
-it=Italiano
-ja=日本語
-ka=ქართული
-kk=Қазақ
-kn=ಕನ್ನಡ
-ko=한국어
-ku=Kurdî
-la=Latina
-lt=lietuvių
-lv=Latviešu
-mg=Malagasy
-mi=Māori (Aotearoa)
-mk=Македонски
-ml=മലയാളം
-mn=Монгол
-mr=मराठी
-nb-NO=Norsk bokmål
-ne-NP=नेपाली
-nl=Nederlands
-nn-NO=Norsk nynorsk
-nr=isiNdebele Sepumalanga
-nso=Sepedi
-oc=occitan (lengadocian)
-or=ଓଡ଼ିଆ
-pa-IN=ਪੰਜਾਬੀ
-pl=Polski
-pt-BR=Português (do Brasil)
-pt-PT=Português (Europeu)
-rm=rumantsch
-ro=română
-ru=Русский
-rw=Ikinyarwanda
-si=සිංහල
-sk=slovenčina
-sl=slovensko
-sq=Shqip
-sr=Српски
-sr-Latn=Srpski
-ss=Siswati
-st=Sesotho
-sv-SE=Svenska
-ta=தமிழ்
-ta-IN=தமிழ் (இந்தியா)
-ta-LK=தமிழ் (இலங்கை)
-te=తెలుగు
-th=ไทย
-tn=Setswana
-tr=Türkçe
-ts=Mutsonga
-tt-RU=Tatarça
-uk=Українська
-ur=اُردو
-ve=Tshivenḓa
-vi=Tiếng Việt
-wo=Wolof
-xh=isiXhosa
-zh-CN=中文 (简体)
-zh-TW=正體中文 (繁體)
-zu=isiZulu
diff --git a/mobile/android/chrome/content/netError.xhtml b/mobile/android/chrome/content/netError.xhtml
deleted file mode 100644
index 1fda0b61826e..000000000000
--- a/mobile/android/chrome/content/netError.xhtml
+++ /dev/null
@@ -1,315 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-<!DOCTYPE html [
-  <!ENTITY % htmlDTD
-    PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
-    "DTD/xhtml1-strict.dtd">
-  %htmlDTD;
-  <!ENTITY % netErrorDTD
-    SYSTEM "chrome://global/locale/netError.dtd">
-  %netErrorDTD;
-  <!ENTITY % globalDTD
-    SYSTEM "chrome://global/locale/global.dtd">
-  %globalDTD;
-]>
-
-<!-- This Source Code Form is subject to the terms of the Mozilla Public
-   - License, v. 2.0. If a copy of the MPL was not distributed with this
-   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-
-<html xmlns="http://www.w3.org/1999/xhtml">
-  <head>
-    <meta name="viewport" content="width=device-width; user-scalable=false;" />
-    <title>&loadError.label;</title>
-    <link rel="stylesheet" href="chrome://browser/skin/netError.css" media="all" />
-    <!-- If the location of the favicon is changed here, the FAVICON_ERRORPAGE_URL symbol in
-         toolkit/components/places/src/nsFaviconService.h should be updated. -->
-    <link rel="icon" type="image/png" id="favicon" sizes="64x64" href="chrome://browser/skin/images/errorpage-warning.png"/>
-
-    <script type="application/javascript"><![CDATA[
-      // Error url MUST be formatted like this:
-      //   moz-neterror:page?e=error&u=url&d=desc
-      //
-      // or optionally, to specify an alternate CSS class to allow for
-      // custom styling and favicon:
-      //
-      //   moz-neterror:page?e=error&u=url&s=classname&d=desc
-
-      // Note that this file uses document.documentURI to get
-      // the URL (with the format from above). This is because
-      // document.location.href gets the current URI off the docshell,
-      // which is the URL displayed in the location bar, i.e.
-      // the URI that the user attempted to load.
-
-      function getErrorCode() {
-        var url = document.documentURI;
-        var error = url.search(/e\=/);
-        var duffUrl = url.search(/\&u\=/);
-        return decodeURIComponent(url.slice(error + 2, duffUrl));
-      }
-
-      function getCSSClass() {
-        var url = document.documentURI;
-        var matches = url.match(/s\=([^&]+)\&/);
-        // s is optional, if no match just return nothing
-        if (!matches || matches.length < 2)
-          return "";
-
-        // parenthetical match is the second entry
-        return decodeURIComponent(matches[1]);
-      }
-
-      function getDescription() {
-        var url = document.documentURI;
-        var desc = url.search(/d\=/);
-
-        // desc == -1 if not found; if so, return an empty string
-        // instead of what would turn out to be portions of the URI
-        if (desc == -1)
-          return "";
-
-        return decodeURIComponent(url.slice(desc + 2));
-      }
-
-      function retryThis(buttonEl) {
-        // Note: The application may wish to handle switching off "offline mode"
-        // before this event handler runs, but using a capturing event handler.
-
-        // Session history has the URL of the page that failed
-        // to load, not the one of the error page. So, just call
-        // reload(), which will also repost POST data correctly.
-        try {
-          location.reload();
-        } catch (e) {
-          // We probably tried to reload a URI that caused an exception to
-          // occur;  e.g. a nonexistent file.
-        }
-      }
-
-      function initPage() {
-        var err = getErrorCode();
-
-        // if it's an unknown error or there's no title or description
-        // defined, get the generic message
-        var errTitle = document.getElementById("et_" + err);
-        var errDesc  = document.getElementById("ed_" + err);
-        if (!errTitle || !errDesc) {
-          errTitle = document.getElementById("et_generic");
-          errDesc  = document.getElementById("ed_generic");
-        }
-
-        var title = document.getElementsByClassName("errorTitleText")[0];
-        if (title) {
-          title.parentNode.replaceChild(errTitle, title);
-          // change id to the replaced child's id so styling works
-          errTitle.classList.add("errorTitleText");
-        }
-
-        var ld = document.getElementById("errorLongDesc");
-        if (ld) {
-          ld.parentNode.replaceChild(errDesc, ld);
-          // change id to the replaced child's id so styling works
-          errDesc.id = "errorLongDesc";
-        }
-
-        // remove undisplayed errors to avoid bug 39098
-        var errContainer = document.getElementById("errorContainer");
-        errContainer.remove();
-
-        var className = getCSSClass();
-        if (className && className != "expertBadCert") {
-          // Associate a CSS class with the root of the page, if one was passed in,
-          // to allow custom styling.
-          // Not "expertBadCert" though, don't want to deal with the favicon
-          document.documentElement.className = className;
-
-          // Also, if they specified a CSS class, they must supply their own
-          // favicon.  In order to trigger the browser to repaint though, we
-          // need to remove/add the link element.
-          var favicon = document.getElementById("favicon");
-          var faviconParent = favicon.parentNode;
-          faviconParent.removeChild(favicon);
-          favicon.setAttribute("href", "chrome://global/skin/icons/" + className + "_favicon.png");
-          faviconParent.appendChild(favicon);
-        }
-        if (className == "expertBadCert") {
-          showSecuritySection();
-        }
-
-        if (err == "remoteXUL") {
-          // Remove the "Try again" button for remote XUL errors given that
-          // it is useless.
-          document.getElementById("errorTryAgain").style.display = "none";
-        }
-
-        if (err == "cspBlocked") {
-          // Remove the "Try again" button for CSP violations, since it's
-          // almost certainly useless. (Bug 553180)
-          document.getElementById("errorTryAgain").style.display = "none";
-        }
-
-        if (err == "nssBadCert") {
-          // Remove the "Try again" button for security exceptions, since it's
-          // almost certainly useless.
-          document.getElementById("errorTryAgain").style.display = "none";
-          document.getElementById("errorPage").setAttribute("class", "certerror");
-        } else {
-          // Remove the override block for non-certificate errors.  CSS-hiding
-          // isn't good enough here, because of bug 39098
-          var secOverride = document.getElementById("securityOverrideDiv");
-          secOverride.remove();
-        }
-
-        if (err != "nssBadCert" && err != "nssFailure2") {
-          var sd = document.getElementById("errorShortDescText");
-          if (sd) {
-            sd.textContent = getDescription();
-          }
-        }
-
-        if (err == "inadequateSecurityError") {
-          // Remove the "Try again" button for HTTP/2 inadequate security as it
-          // is useless.
-          document.getElementById("errorTryAgain").style.display = "none";
-
-          var container = document.getElementById("errorLongDesc");
-          for (var span of container.querySelectorAll("span.hostname")) {
-            span.textContent = document.location.hostname;
-          }
-        }
-
-        var event = new CustomEvent("AboutNetErrorLoad", {bubbles: true});
-        document.dispatchEvent(event);
-      }
-
-      function showSecuritySection() {
-        // Swap link out, content in
-        document.getElementById("securityOverrideContent").style.display = "";
-        document.getElementById("securityOverrideLink").style.display = "none";
-      }
-
-      function createLink(el, id, text) {
-        var anchorEl = document.createElement("a");
-        anchorEl.setAttribute("id", id);
-        anchorEl.setAttribute("title", text);
-        anchorEl.appendChild(document.createTextNode(text));
-        el.appendChild(anchorEl);
-      }
-    ]]></script>
-  </head>
-
-  <body id="errorPage" dir="&locale.dir;">
-
-    <!-- ERROR ITEM CONTAINER (removed during loading to avoid bug 39098) -->
-    <div id="errorContainer">
-      <div id="errorTitlesContainer">
-        <h1 id="et_generic">&generic.title;</h1>
-        <h1 id="et_dnsNotFound">&dnsNotFound.title;</h1>
-        <h1 id="et_fileNotFound">&fileNotFound.title;</h1>
-        <h1 id="et_fileAccessDenied">&fileAccessDenied.title;</h1>
-        <h1 id="et_malformedURI">&malformedURI.title;</h1>
-        <h1 id="et_unknownProtocolFound">&unknownProtocolFound.title;</h1>
-        <h1 id="et_connectionFailure">&connectionFailure.title;</h1>
-        <h1 id="et_netTimeout">&netTimeout.title;</h1>
-        <h1 id="et_redirectLoop">&redirectLoop.title;</h1>
-        <h1 id="et_unknownSocketType">&unknownSocketType.title;</h1>
-        <h1 id="et_netReset">&netReset.title;</h1>
-        <h1 id="et_notCached">&notCached.title;</h1>
-
-        <!-- Since Fennec not yet have offline mode, change the title to
-        connectionFailure to prevent confusion -->
-        <h1 id="et_netOffline">&connectionFailure.title;</h1>
-
-        <h1 id="et_netInterrupt">&netInterrupt.title;</h1>
-        <h1 id="et_deniedPortAccess">&deniedPortAccess.title;</h1>
-        <h1 id="et_proxyResolveFailure">&proxyResolveFailure.title;</h1>
-        <h1 id="et_proxyConnectFailure">&proxyConnectFailure.title;</h1>
-        <h1 id="et_contentEncodingError">&contentEncodingError.title;</h1>
-        <h1 id="et_unsafeContentType">&unsafeContentType.title;</h1>
-        <h1 id="et_nssFailure2">&nssFailure2.title;</h1>
-        <h1 id="et_nssBadCert">&nssBadCert.title;</h1>
-        <h1 id="et_cspBlocked">&cspBlocked.title;</h1>
-        <h1 id="et_remoteXUL">&remoteXUL.title;</h1>
-        <h1 id="et_corruptedContentErrorv2">&corruptedContentErrorv2.title;</h1>
-        <h1 id="et_sslv3Used">&sslv3Used.title;</h1>
-        <h1 id="et_weakCryptoUsed">&weakCryptoUsed.title;</h1>
-        <h1 id="et_inadequateSecurityError">&inadequateSecurityError.title;</h1>
-        <h1 id="et_networkProtocolError">&networkProtocolError.title;</h1>
-      </div>
-      <div id="errorDescriptionsContainer">
-        <div id="ed_generic">&generic.longDesc;</div>
-        <div id="ed_dnsNotFound">&dnsNotFound.longDesc4;</div>
-        <div id="ed_fileNotFound">&fileNotFound.longDesc;</div>
-        <div id="ed_fileAccessDenied">&fileAccessDenied.longDesc;</div>
-        <div id="ed_malformedURI">&malformedURI.longDesc2;</div>
-        <div id="ed_unknownProtocolFound">&unknownProtocolFound.longDesc;</div>
-        <div id="ed_connectionFailure">&connectionFailure.longDesc2;</div>
-        <div id="ed_netTimeout">&netTimeout.longDesc2;</div>
-        <div id="ed_redirectLoop">&redirectLoop.longDesc;</div>
-        <div id="ed_unknownSocketType">&unknownSocketType.longDesc;</div>
-        <div id="ed_netReset">&netReset.longDesc2;</div>
-        <div id="ed_notCached">&notCached.longDesc;</div>
-
-        <!-- Change longDesc from netOffline to connectionFailure,
-        suggesting user to check their wifi/cell_data connection -->
-        <div id="ed_netOffline">&connectionFailure.longDesc2;</div>
-
-        <div id="ed_netInterrupt">&netInterrupt.longDesc2;</div>
-        <div id="ed_deniedPortAccess">&deniedPortAccess.longDesc;</div>
-        <div id="ed_proxyResolveFailure">&proxyResolveFailure.longDesc3;</div>
-        <div id="ed_proxyConnectFailure">&proxyConnectFailure.longDesc;</div>
-        <div id="ed_contentEncodingError">&contentEncodingError.longDesc;</div>
-        <div id="ed_unsafeContentType">&unsafeContentType.longDesc;</div>
-        <div id="ed_nssFailure2">&nssFailure2.longDesc2;</div>
-        <div id="ed_nssBadCert">&nssBadCert.longDesc2;</div>
-        <div id="ed_cspBlocked">&cspBlocked.longDesc;</div>
-        <div id="ed_remoteXUL">&remoteXUL.longDesc;</div>
-        <div id="ed_corruptedContentErrorv2">&corruptedContentErrorv2.longDesc;</div>
-        <div id="ed_sslv3Used">&sslv3Used.longDesc;</div>
-        <div id="ed_weakCryptoUsed">&weakCryptoUsed.longDesc;</div>
-        <div id="ed_inadequateSecurityError">&inadequateSecurityError.longDesc;</div>
-        <div id="ed_networkProtocolError">&networkProtocolError.longDesc;</div>
-      </div>
-    </div>
-
-    <!-- PAGE CONTAINER (for styling purposes only) -->
-    <div id="errorPageContainer">
-
-      <!-- Error Title -->
-      <div id="errorTitle">
-        <h1 class="errorTitleText" />
-      </div>
-
-      <!-- LONG CONTENT (the section most likely to require scrolling) -->
-      <div id="errorLongContent">
-
-        <!-- Short Description -->
-        <div id="errorShortDesc">
-          <p id="errorShortDescText" />
-        </div>
-
-        <!-- Long Description (Note: See netError.dtd for used XHTML tags) -->
-        <div id="errorLongDesc" />
-
-        <!-- Override section - For ssl errors only.  Removed on init for other
-             error types.  -->
-        <div id="securityOverrideDiv">
-          <a id="securityOverrideLink" href="javascript:showSecuritySection();" >&securityOverride.linkText;</a>
-          <div id="securityOverrideContent" style="display: none;">&securityOverride.warningContent;</div>
-        </div>
-      </div>
-
-      <!-- Retry Button -->
-      <button id="errorTryAgain" onclick="retryThis(this);">&retry.label;</button>
-
-    </div>
-
-    <!--
-    - Note: It is important to run the script this way, instead of using
-    - an onload handler. This is because error pages are loaded as
-    - LOAD_BACKGROUND, which means that onload handlers will not be executed.
-    -->
-    <script type="application/javascript">initPage();</script>
-
-  </body>
-</html>
diff --git a/mobile/android/chrome/jar.mn b/mobile/android/chrome/jar.mn
deleted file mode 100644
index b9521b70c86c..000000000000
--- a/mobile/android/chrome/jar.mn
+++ /dev/null
@@ -1,74 +0,0 @@
-#filter substitution
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-chrome.jar:
-% content browser %content/ contentaccessible=yes
-
-* content/about.xhtml                  (content/about.xhtml)
-* content/about.js                     (content/about.js)
-  content/content.js                   (content/content.js)
-  content/aboutAddons.xhtml            (content/aboutAddons.xhtml)
-  content/aboutAddons.js               (content/aboutAddons.js)
-  content/aboutCertError.xhtml         (content/aboutCertError.xhtml)
-  content/aboutDownloads.xhtml         (content/aboutDownloads.xhtml)
-  content/aboutDownloads.js            (content/aboutDownloads.js)
-  content/aboutPrivateBrowsing.xhtml   (content/aboutPrivateBrowsing.xhtml)
-  content/aboutPrivateBrowsing.js      (content/aboutPrivateBrowsing.js)
-  content/Reader.js                    (content/Reader.js)
-  content/aboutHome.xhtml              (content/aboutHome.xhtml)
-  content/aboutRights.xhtml            (content/aboutRights.xhtml)
-  content/blockedSite.xhtml            (content/blockedSite.xhtml)
-  content/languages.properties         (content/languages.properties)
-  content/browser.xul                  (content/browser.xul)
-  content/browser.css                  (content/browser.css)
-  content/browser.js                   (content/browser.js)
-  content/PresentationView.xul         (content/PresentationView.xul)
-  content/PresentationView.js          (content/PresentationView.js)
-  content/netError.xhtml               (content/netError.xhtml)
-  content/EmbedRT.js                   (content/EmbedRT.js)
-  content/MemoryObserver.js            (content/MemoryObserver.js)
-  content/ConsoleAPI.js                (content/ConsoleAPI.js)
-  content/PrintHelper.js               (content/PrintHelper.js)
-  content/OfflineApps.js               (content/OfflineApps.js)
-  content/MasterPassword.js            (content/MasterPassword.js)
-  content/FindHelper.js                (content/FindHelper.js)
-  content/PermissionsHelper.js         (content/PermissionsHelper.js)
-  content/FeedHandler.js               (content/FeedHandler.js)
-  content/Feedback.js                  (content/Feedback.js)
-  content/Linkify.js                   (content/Linkify.js)
-  content/CastingApps.js               (content/CastingApps.js)
-  content/RemoteDebugger.js            (content/RemoteDebugger.js)
-  content/aboutAccounts.xhtml          (content/aboutAccounts.xhtml)
-  content/aboutAccounts.js             (content/aboutAccounts.js)
-  content/aboutExperiments.xhtml       (content/aboutExperiments.xhtml)
-  content/aboutExperiments.js          (content/aboutExperiments.js)
-  content/aboutLogins.xhtml            (content/aboutLogins.xhtml)
-  content/aboutLogins.js               (content/aboutLogins.js)
-  content/ExtensionPermissions.js      (content/ExtensionPermissions.js)
-
-% override chrome://global/content/netError.xhtml chrome://browser/content/netError.xhtml
-% override chrome://mozapps/content/extensions/extensions.xul chrome://browser/content/aboutAddons.xhtml
-
-# L10n resource overrides.
-% override chrome://global/locale/aboutReader.properties chrome://browser/locale/overrides/aboutReader.properties
-% override chrome://global/locale/charsetMenu.properties chrome://browser/locale/overrides/charsetMenu.properties
-% override chrome://global/locale/commonDialogs.properties chrome://browser/locale/overrides/commonDialogs.properties
-% override chrome://global/locale/intl.properties chrome://browser/locale/overrides/intl.properties
-% override chrome://global/locale/intl.css chrome://browser/locale/overrides/intl.css
-% override chrome://global/locale/search/search.properties chrome://browser/locale/overrides/search/search.properties
-% override chrome://pluginproblem/locale/pluginproblem.dtd chrome://browser/locale/overrides/plugins/pluginproblem.dtd
-% override chrome://global/locale/mozilla.dtd chrome://browser/locale/overrides/global/mozilla.dtd
-% override chrome://global/locale/aboutWebrtc.properties chrome://browser/locale/overrides/global/aboutWebrtc.properties
-
-# overrides for dom l10n, also for en-US
-# keep this file list in sync with filter.py
-% override chrome://global/locale/global.dtd chrome://browser/locale/overrides/global.dtd
-% override chrome://global/locale/AccessFu.properties chrome://browser/locale/overrides/AccessFu.properties
-% override chrome://global/locale/dom/dom.properties chrome://browser/locale/overrides/dom/dom.properties
-% override chrome://global/locale/plugins.properties chrome://browser/locale/overrides/plugins.properties
-
-# mobile/locales/jar.mn resources and overrides
-% override chrome://global/locale/netError.dtd    chrome://browser/locale/netError.dtd
-% override chrome://global/locale/appstrings.properties chrome://browser/locale/appstrings.properties
diff --git a/mobile/android/chrome/moz.build b/mobile/android/chrome/moz.build
index aebab5ee824b..dc1e6a82a7db 100644
--- a/mobile/android/chrome/moz.build
+++ b/mobile/android/chrome/moz.build
@@ -18,5 +18,3 @@ DEFINES['PACKAGE'] = 'browser'
 DEFINES['MOZ_APP_VERSION'] = CONFIG['MOZ_APP_VERSION']
 DEFINES['MOZ_APP_VERSION_DISPLAY'] = CONFIG['MOZ_APP_VERSION_DISPLAY']
 DEFINES['ANDROID_PACKAGE_NAME'] = CONFIG['ANDROID_PACKAGE_NAME']
-
-JAR_MANIFESTS += ['jar.mn']
diff --git a/mobile/android/extensions/moz.build b/mobile/android/extensions/moz.build
deleted file mode 100644
index 2c2445fbc496..000000000000
--- a/mobile/android/extensions/moz.build
+++ /dev/null
@@ -1,16 +0,0 @@
-# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-with Files('**'):
-    BUG_COMPONENT = ('Firefox for Android', 'General')
-
-DIRS += [
-    'webcompat'
-]
-if not CONFIG['MOZ_UPDATE_CHANNEL'] in ('release', 'esr'):
-    DIRS += [
-        'report-site-issue'
-    ]
diff --git a/mobile/android/extensions/report-site-issue/.eslintrc.js b/mobile/android/extensions/report-site-issue/.eslintrc.js
deleted file mode 100644
index b3390082cbf3..000000000000
--- a/mobile/android/extensions/report-site-issue/.eslintrc.js
+++ /dev/null
@@ -1,69 +0,0 @@
-"use strict";
-
-module.exports = {
-  "rules": {
-    // Rules from the mozilla plugin
-    "mozilla/balanced-listeners": "error",
-    "mozilla/no-aArgs": "error",
-    "mozilla/var-only-at-top-level": "error",
-
-    "valid-jsdoc": ["error", {
-      "prefer": {
-        "return": "returns",
-      },
-      "preferType": {
-        "Boolean": "boolean",
-        "Number": "number",
-        "String": "string",
-        "bool": "boolean",
-      },
-      "requireParamDescription": false,
-      "requireReturn": false,
-      "requireReturnDescription": false,
-    }],
-
-    // No expressions where a statement is expected
-    "no-unused-expressions": "error",
-
-    // No declaring variables that are never used
-    "no-unused-vars": "error",
-
-    // Disallow using variables outside the blocks they are defined (especially
-    // since only let and const are used, see "no-var").
-    "block-scoped-var": "error",
-
-    // Warn about cyclomatic complexity in functions.
-    "complexity": ["error", {"max": 26}],
-
-    // Maximum depth callbacks can be nested.
-    "max-nested-callbacks": ["error", 4],
-
-    // Allow the console API aside from console.log.
-    "no-console": ["error", {allow: ["error", "info", "trace", "warn"]}],
-
-    // Disallow fallthrough of case statements, except if there is a comment.
-    "no-fallthrough": "error",
-
-    // Disallow use of multiline strings (use template strings instead).
-    "no-multi-str": "error",
-
-    // Disallow usage of __proto__ property.
-    "no-proto": "error",
-
-    // Disallow use of assignment in return statement. It is preferable for a
-    // single line of code to have only one easily predictable effect.
-    "no-return-assign": "error",
-
-    // Require use of the second argument for parseInt().
-    "radix": "error",
-
-    // Require "use strict" to be defined globally in the script.
-    "strict": ["error", "global"],
-
-    // Disallow Yoda conditions (where literal value comes first).
-    "yoda": "error",
-
-    // Disallow function or variable declarations in nested blocks
-    "no-inner-declarations": "error",
-  },
-};
diff --git a/mobile/android/extensions/report-site-issue/background.js b/mobile/android/extensions/report-site-issue/background.js
deleted file mode 100644
index 68eeb5b3d424..000000000000
--- a/mobile/android/extensions/report-site-issue/background.js
+++ /dev/null
@@ -1,306 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* globals browser */
-
-const Config = {
-  newIssueEndpoint: "https://webcompat.com/issues/new",
-  newIssueEndpointPref: "newIssueEndpoint",
-  screenshotFormat: {
-    format: "jpeg",
-    quality: 75,
-  },
-};
-
-const FRAMEWORK_KEYS = ["hasFastClick", "hasMobify", "hasMarfeel"];
-
-// If parental controls are on, we don't activate (that is, we don't show our
-// menu item or prompt the user when they use "request desktop site".
-browser.browserInfo.getParentalControlsEnabled().then(enabled => {
-  if (enabled) {
-    return;
-  }
-
-  browser.aboutConfigPrefs.onEndpointPrefChange.addListener(checkEndpointPref);
-  checkEndpointPref();
-
-  activateMenuItem();
-  activateDesktopViewPrompts();
-});
-
-function activateDesktopViewPrompts() {
-  Promise.all([
-    browser.l10n.getMessage("webcompat.reportDesktopMode.message"),
-    browser.l10n.getMessage("webcompat.reportDesktopModeYes.label"),
-  ])
-    .then(([message, button]) => {
-      browser.tabExtras.onDesktopSiteRequested.addListener(async tabId => {
-        browser.tabs
-          .get(tabId)
-          .then(tab => {
-            browser.snackbars
-              .show(message, button)
-              .then(() => {
-                reportForTab(tab);
-              })
-              .catch(() => {});
-          })
-          .catch(() => {});
-      });
-    })
-    .catch(() => {});
-}
-
-function activateMenuItem() {
-  browser.nativeMenu.show();
-
-  browser.l10n
-    .getMessage("webcompat.menu.name")
-    .then(label => {
-      // We use Fennec NativeMenus because its BrowserAction implementation
-      // lacks support for enabling/disabling its items.
-      browser.nativeMenu.setLabel(label);
-    })
-    .catch(() => {});
-
-  browser.nativeMenu.onClicked.addListener(async () => {
-    const tabs = await browser.tabs.query({ active: true });
-    reportForTab(tabs[0]);
-  });
-
-  async function updateMenuItem(url) {
-    if (isReportableUrl(url)) {
-      await browser.nativeMenu.enable();
-    } else {
-      await browser.nativeMenu.disable();
-    }
-  }
-
-  browser.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
-    if ("url" in changeInfo && tab.active) {
-      updateMenuItem(tab.url);
-    }
-  });
-
-  browser.tabs.onActivated.addListener(({ tabId }) => {
-    browser.tabs
-      .get(tabId)
-      .then(({ url }) => {
-        updateMenuItem(url);
-      })
-      .catch(() => {
-        updateMenuItem("about"); // So the action is disabled
-      });
-  });
-
-  browser.tabs
-    .query({ active: true })
-    .then(tabs => {
-      updateMenuItem(tabs[0].url);
-    })
-    .catch(() => {});
-}
-
-function isReportableUrl(url) {
-  return (
-    url &&
-    !(
-      url.startsWith("about") ||
-      url.startsWith("chrome") ||
-      url.startsWith("file") ||
-      url.startsWith("resource")
-    )
-  );
-}
-
-async function reportForTab(tab) {
-  return getWebCompatInfoForTab(tab)
-    .then(async info => {
-      return openWebCompatTab(info, tab.incognito);
-    })
-    .catch(err => {
-      console.error("Report Site Issue: unexpected error", err);
-    });
-}
-
-async function checkEndpointPref() {
-  const value = await browser.aboutConfigPrefs.getEndpointPref();
-  if (value === undefined) {
-    browser.aboutConfigPrefs.setEndpointPref(Config.newIssueEndpoint);
-  } else {
-    Config.newIssueEndpoint = value;
-  }
-}
-
-function hasFastClickPageScript() {
-  const win = window.wrappedJSObject;
-
-  if (win.FastClick) {
-    return true;
-  }
-
-  for (const property in win) {
-    try {
-      const proto = win[property].prototype;
-      if (proto && proto.needsClick) {
-        return true;
-      }
-    } catch (_) {}
-  }
-
-  return false;
-}
-
-function hasMobifyPageScript() {
-  const win = window.wrappedJSObject;
-  return !!(win.Mobify && win.Mobify.Tag);
-}
-
-function hasMarfeelPageScript() {
-  const win = window.wrappedJSObject;
-  return !!win.marfeel;
-}
-
-function checkForFrameworks(tabId) {
-  return browser.tabs
-    .executeScript(tabId, {
-      code: `
-      (function() {
-        ${hasFastClickPageScript};
-        ${hasMobifyPageScript};
-        ${hasMarfeelPageScript};
-        
-        const result = {
-          hasFastClick: hasFastClickPageScript(),
-          hasMobify: hasMobifyPageScript(),
-          hasMarfeel: hasMarfeelPageScript(),
-        }
-
-        return result;
-      })();
-    `,
-    })
-    .then(([results]) => results)
-    .catch(() => false);
-}
-
-function getWebCompatInfoForTab(tab) {
-  const { id, windiwId, url } = tab;
-  return Promise.all([
-    browser.browserInfo.getBlockList(),
-    browser.browserInfo.getBuildID(),
-    browser.browserInfo.getGraphicsPrefs(),
-    browser.browserInfo.getUpdateChannel(),
-    browser.browserInfo.hasTouchScreen(),
-    browser.tabExtras.getWebcompatInfo(id),
-    checkForFrameworks(id),
-    browser.tabs
-      .captureVisibleTab(windiwId, Config.screenshotFormat)
-      .catch(e => {
-        console.error("Report Site Issue: getting a screenshot failed", e);
-        return Promise.resolve(undefined);
-      }),
-  ]).then(
-    ([
-      blockList,
-      buildID,
-      graphicsPrefs,
-      channel,
-      hasTouchScreen,
-      frameInfo,
-      frameworks,
-      screenshot,
-    ]) => {
-      if (channel !== "linux") {
-        delete graphicsPrefs["layers.acceleration.force-enabled"];
-      }
-
-      const consoleLog = frameInfo.log;
-      delete frameInfo.log;
-
-      return Object.assign(frameInfo, {
-        tabId: id,
-        blockList,
-        details: Object.assign(graphicsPrefs, {
-          buildID,
-          channel,
-          consoleLog,
-          frameworks,
-          hasTouchScreen,
-          "mixed active content blocked":
-            frameInfo.hasMixedActiveContentBlocked,
-          "mixed passive content blocked":
-            frameInfo.hasMixedDisplayContentBlocked,
-          "tracking content blocked": frameInfo.hasTrackingContentBlocked
-            ? `true (${blockList})`
-            : "false",
-        }),
-        screenshot,
-        url,
-      });
-    }
-  );
-}
-
-function stripNonASCIIChars(str) {
-  // eslint-disable-next-line no-control-regex
-  return str.replace(/[^\x00-\x7F]/g, "");
-}
-
-async function openWebCompatTab(compatInfo, usePrivateTab) {
-  const url = new URL(Config.newIssueEndpoint);
-  const { details } = compatInfo;
-  const params = {
-    url: `${compatInfo.url}`,
-    utm_source: "mobile-reporter",
-    utm_campaign: "report-site-issue-button",
-    src: "mobile-reporter",
-    details,
-    extra_labels: [],
-  };
-
-  for (let framework of FRAMEWORK_KEYS) {
-    if (details.frameworks[framework]) {
-      params.details[framework] = true;
-      params.extra_labels.push(
-        framework.replace(/^has/, "type-").toLowerCase()
-      );
-    }
-  }
-  delete details.frameworks;
-
-  if (details["gfx.webrender.all"] || details["gfx.webrender.enabled"]) {
-    params.extra_labels.push("type-webrender-enabled");
-  }
-  if (compatInfo.hasTrackingContentBlocked) {
-    params.extra_labels.push(
-      `type-tracking-protection-${compatInfo.blockList}`
-    );
-  }
-
-  // Need custom API for private tabs until https://bugzil.la/1372178 is fixed
-  const tab = usePrivateTab
-    ? await browser.tabExtras.createPrivateTab()
-    : await browser.tabs.create({ url: "about:blank" });
-  const json = stripNonASCIIChars(JSON.stringify(params));
-  await browser.tabExtras.loadURIWithPostData(
-    tab.id,
-    url.href,
-    json,
-    "application/json"
-  );
-  await browser.tabs.executeScript(tab.id, {
-    runAt: "document_end",
-    code: `(function() {
-      async function sendScreenshot(dataURI) {
-        const res = await fetch(dataURI);
-        const blob = await res.blob();
-        postMessage(blob, "${url.origin}");
-      }
-      sendScreenshot("${compatInfo.screenshot}");
-    })()`,
-  });
-}
diff --git a/mobile/android/extensions/report-site-issue/experimentalAPIs/aboutConfigPrefs.js b/mobile/android/extensions/report-site-issue/experimentalAPIs/aboutConfigPrefs.js
deleted file mode 100644
index 97206ba7546d..000000000000
--- a/mobile/android/extensions/report-site-issue/experimentalAPIs/aboutConfigPrefs.js
+++ /dev/null
@@ -1,41 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* global ExtensionAPI, ExtensionCommon */
-
-var { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
-
-this.aboutConfigPrefs = class extends ExtensionAPI {
-  getAPI(context) {
-    const EventManager = ExtensionCommon.EventManager;
-    const extensionIDBase = context.extension.id.split("@")[0];
-    const endpointPrefName = `extensions.${extensionIDBase}.newIssueEndpoint`;
-
-    return {
-      aboutConfigPrefs: {
-        onEndpointPrefChange: new EventManager({
-          context,
-          name: "aboutConfigPrefs.onEndpointPrefChange",
-          register: fire => {
-            const callback = () => {
-              fire.async().catch(() => {}); // ignore Message Manager disconnects
-            };
-            Services.prefs.addObserver(endpointPrefName, callback);
-            return () => {
-              Services.prefs.removeObserver(endpointPrefName, callback);
-            };
-          },
-        }).api(),
-        async getEndpointPref() {
-          return Services.prefs.getStringPref(endpointPrefName, undefined);
-        },
-        async setEndpointPref(value) {
-          Services.prefs.setStringPref(endpointPrefName, value);
-        },
-      },
-    };
-  }
-};
diff --git a/mobile/android/extensions/report-site-issue/experimentalAPIs/aboutConfigPrefs.json b/mobile/android/extensions/report-site-issue/experimentalAPIs/aboutConfigPrefs.json
deleted file mode 100644
index 1fd313e39240..000000000000
--- a/mobile/android/extensions/report-site-issue/experimentalAPIs/aboutConfigPrefs.json
+++ /dev/null
@@ -1,35 +0,0 @@
-[
-  {
-    "namespace": "aboutConfigPrefs",
-    "description": "experimental API extension to allow access to about:config preferences",
-    "events": [
-      {
-        "name": "onEndpointPrefChange",
-        "type": "function",
-        "parameters": []
-      }
-    ],
-    "functions": [
-      {
-        "name": "getEndpointPref",
-        "type": "function",
-        "description": "Get the endpoint preference's value",
-        "parameters": [],
-        "async": true
-      },
-      {
-        "name": "setEndpointPref",
-        "type": "function",
-        "description": "Set the endpoint preference's value",
-        "parameters": [
-          {
-            "name": "value",
-            "type": "string",
-            "description": "The new value"
-          }
-        ],
-        "async": true
-      }
-    ]
-  }
-]
diff --git a/mobile/android/extensions/report-site-issue/experimentalAPIs/browserInfo.js b/mobile/android/extensions/report-site-issue/experimentalAPIs/browserInfo.js
deleted file mode 100644
index ce28afdf246e..000000000000
--- a/mobile/android/extensions/report-site-issue/experimentalAPIs/browserInfo.js
+++ /dev/null
@@ -1,72 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* global ExtensionAPI */
-
-var { AppConstants } = ChromeUtils.import(
-  "resource://gre/modules/AppConstants.jsm"
-);
-var { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
-
-const gParentalControls = (function() {
-  if ("@mozilla.org/parental-controls-service;1" in Cc) {
-    return Cc["@mozilla.org/parental-controls-service;1"].createInstance(
-      Ci.nsIParentalControlsService
-    );
-  }
-  return { parentalControlsEnabled: false };
-})();
-
-this.browserInfo = class extends ExtensionAPI {
-  getAPI(context) {
-    return {
-      browserInfo: {
-        async getGraphicsPrefs() {
-          const prefs = {};
-          for (const [name, dflt] of Object.entries({
-            "layers.acceleration.force-enabled": false,
-            "gfx.webrender.all": false,
-            "gfx.webrender.blob-images": true,
-            "gfx.webrender.enabled": false,
-            "image.mem.shared": true,
-          })) {
-            prefs[name] = Services.prefs.getBoolPref(name, dflt);
-          }
-          return prefs;
-        },
-        async getAppVersion() {
-          return AppConstants.MOZ_APP_VERSION;
-        },
-        async getBlockList() {
-          const trackingTable = Services.prefs.getCharPref(
-            "urlclassifier.trackingTable"
-          );
-          // If content-track-digest256 is in the tracking table,
-          // the user has enabled the strict list.
-          return trackingTable.includes("content") ? "strict" : "basic";
-        },
-        async getBuildID() {
-          return Services.appinfo.appBuildID;
-        },
-        async getUpdateChannel() {
-          return AppConstants.MOZ_UPDATE_CHANNEL;
-        },
-        async getParentalControlsEnabled() {
-          return gParentalControls.parentalControlsEnabled;
-        },
-        async getPlatform() {
-          return AppConstants.platform;
-        },
-        async hasTouchScreen() {
-          const gfxInfo = Cc["@mozilla.org/gfx/info;1"].getService(
-            Ci.nsIGfxInfo
-          );
-          return gfxInfo.getInfo().ApzTouchInput == 1;
-        },
-      },
-    };
-  }
-};
diff --git a/mobile/android/extensions/report-site-issue/experimentalAPIs/browserInfo.json b/mobile/android/extensions/report-site-issue/experimentalAPIs/browserInfo.json
deleted file mode 100644
index 4b26c40133bf..000000000000
--- a/mobile/android/extensions/report-site-issue/experimentalAPIs/browserInfo.json
+++ /dev/null
@@ -1,64 +0,0 @@
-[
-  {
-    "namespace": "browserInfo",
-    "description": "experimental API extensions to get browser info not exposed via web APIs",
-    "functions": [
-      {
-        "name": "getAppVersion",
-        "type": "function",
-        "description": "Gets the app version",
-        "parameters": [],
-        "async": true
-      },
-      {
-        "name": "getBlockList",
-        "type": "function",
-        "description": "Gets the current blocklist",
-        "parameters": [],
-        "async": true
-      },
-      {
-        "name": "getBuildID",
-        "type": "function",
-        "description": "Gets the build ID",
-        "parameters": [],
-        "async": true
-      },
-      {
-        "name": "getGraphicsPrefs",
-        "type": "function",
-        "description": "Gets interesting about:config prefs for graphics",
-        "parameters": [],
-        "async": true
-      },
-      {
-        "name": "getParentalControlsEnabled",
-        "type": "function",
-        "description": "Gets whether the Parent Controls are enabled",
-        "parameters": [],
-        "async": true
-      },
-      {
-        "name": "getPlatform",
-        "type": "function",
-        "description": "Gets the platform",
-        "parameters": [],
-        "async": true
-      },
-      {
-        "name": "getUpdateChannel",
-        "type": "function",
-        "description": "Gets the update channel",
-        "parameters": [],
-        "async": true
-      },
-      {
-        "name": "hasTouchScreen",
-        "type": "function",
-        "description": "Gets whether a touchscreen is present",
-        "parameters": [],
-        "async": true
-      }
-    ]
-  }
-]
diff --git a/mobile/android/extensions/report-site-issue/experimentalAPIs/l10n.js b/mobile/android/extensions/report-site-issue/experimentalAPIs/l10n.js
deleted file mode 100644
index efb7a150a23d..000000000000
--- a/mobile/android/extensions/report-site-issue/experimentalAPIs/l10n.js
+++ /dev/null
@@ -1,33 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* global ExtensionAPI, XPCOMUtils */
-
-var { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
-
-XPCOMUtils.defineLazyGetter(this, "l10nStrings", function() {
-  return Services.strings.createBundle(
-    "chrome://browser/locale/webcompatReporter.properties"
-  );
-});
-
-let l10nManifest;
-
-this.l10n = class extends ExtensionAPI {
-  getAPI(context) {
-    return {
-      l10n: {
-        getMessage(name) {
-          try {
-            return Promise.resolve(l10nStrings.GetStringFromName(name));
-          } catch (e) {
-            return Promise.reject(e);
-          }
-        },
-      },
-    };
-  }
-};
diff --git a/mobile/android/extensions/report-site-issue/experimentalAPIs/l10n.json b/mobile/android/extensions/report-site-issue/experimentalAPIs/l10n.json
deleted file mode 100644
index fd10cf68e7c9..000000000000
--- a/mobile/android/extensions/report-site-issue/experimentalAPIs/l10n.json
+++ /dev/null
@@ -1,19 +0,0 @@
-[
-  {
-    "namespace": "l10n",
-    "description": "A stop-gap L10N API only meant to be used until a Fluent-based API is added in bug 1425104",
-    "functions": [
-      {
-        "name": "getMessage",
-        "type": "function",
-        "description": "Gets the message with the given name",
-        "parameters": [{
-          "name": "name",
-          "type": "string",
-          "description": "The name of the message"
-        }],
-        "async": true
-      }
-    ]
-  }
-]
diff --git a/mobile/android/extensions/report-site-issue/experimentalAPIs/nativeMenu.js b/mobile/android/extensions/report-site-issue/experimentalAPIs/nativeMenu.js
deleted file mode 100644
index 41f5e62b83b3..000000000000
--- a/mobile/android/extensions/report-site-issue/experimentalAPIs/nativeMenu.js
+++ /dev/null
@@ -1,65 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* global ExtensionAPI, ExtensionCommon */
-
-const {
-  Management: {
-    global: { windowTracker },
-  },
-} = ChromeUtils.import("resource://gre/modules/Extension.jsm", null);
-
-function getNativeWindow() {
-  return windowTracker.topWindow.NativeWindow;
-}
-
-const clickHandlers = new ExtensionCommon.EventEmitter();
-
-const menuItem = getNativeWindow().menu.add({
-  name: "Report site issue",
-  callback: () => {
-    clickHandlers.emit("click");
-  },
-  enabled: false,
-  visible: false,
-});
-
-this.nativeMenu = class extends ExtensionAPI {
-  getAPI(context) {
-    return {
-      nativeMenu: {
-        onClicked: new ExtensionCommon.EventManager({
-          context,
-          name: "nativeMenu.onClicked",
-          register: fire => {
-            const callback = () => {
-              fire.async().catch(() => {}); // ignore Message Manager disconnects
-            };
-            clickHandlers.on("click", callback);
-            return () => {
-              clickHandlers.off("click", callback);
-            };
-          },
-        }).api(),
-        async disable() {
-          getNativeWindow().menu.update(menuItem, { enabled: false });
-        },
-        async enable() {
-          getNativeWindow().menu.update(menuItem, { enabled: true });
-        },
-        async hide() {
-          getNativeWindow().menu.update(menuItem, { visible: false });
-        },
-        async show() {
-          getNativeWindow().menu.update(menuItem, { visible: true });
-        },
-        async setLabel(label) {
-          getNativeWindow().menu.update(menuItem, { name: label });
-        },
-      },
-    };
-  }
-};
diff --git a/mobile/android/extensions/report-site-issue/experimentalAPIs/nativeMenu.json b/mobile/android/extensions/report-site-issue/experimentalAPIs/nativeMenu.json
deleted file mode 100644
index 79856f94c292..000000000000
--- a/mobile/android/extensions/report-site-issue/experimentalAPIs/nativeMenu.json
+++ /dev/null
@@ -1,53 +0,0 @@
-[
-  {
-    "namespace": "nativeMenu",
-    "description": "experimental extension wrapping around a Fennec NativeMenu",
-    "events": [
-      {
-        "name": "onClicked",
-        "type": "function",
-        "parameters": []
-      }
-    ],
-    "functions": [
-      {
-        "name": "disable",
-        "type": "function",
-        "async": true,
-        "description": "Disable the addon's menu item",
-        "parameters": []
-      },
-      {
-        "name": "enable",
-        "type": "function",
-        "async": true,
-        "description": "Enable the addon's menu item",
-        "parameters": []
-      },
-      {
-        "name": "hide",
-        "type": "function",
-        "async": true,
-        "description": "Hide the addon's menu item",
-        "parameters": []
-      },
-      {
-        "name": "show",
-        "type": "function",
-        "async": true,
-        "description": "Show the addon's menu item",
-        "parameters": []
-      },
-      {
-        "name": "setLabel",
-        "type": "function",
-        "async": true,
-        "description": "Set the label of the addon's menu item",
-        "parameters": [{
-          "name": "label",
-          "type": "string"
-        }]
-      }
-    ]
-  }
-]
diff --git a/mobile/android/extensions/report-site-issue/experimentalAPIs/snackbars.js b/mobile/android/extensions/report-site-issue/experimentalAPIs/snackbars.js
deleted file mode 100644
index 393b3810b67c..000000000000
--- a/mobile/android/extensions/report-site-issue/experimentalAPIs/snackbars.js
+++ /dev/null
@@ -1,43 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* global ExtensionAPI */
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "clearTimeout",
-  "resource://gre/modules/Timer.jsm"
-);
-ChromeUtils.defineModuleGetter(
-  this,
-  "setTimeout",
-  "resource://gre/modules/Timer.jsm"
-);
-ChromeUtils.defineModuleGetter(
-  this,
-  "Snackbars",
-  "resource://gre/modules/Snackbars.jsm"
-);
-
-this.snackbars = class extends ExtensionAPI {
-  getAPI(context) {
-    return {
-      snackbars: {
-        show(message, button) {
-          return new Promise((callback, rejection) => {
-            Snackbars.show(message, Snackbars.LENGTH_LONG, {
-              action: {
-                label: button,
-                callback,
-                rejection,
-              },
-            });
-          });
-        },
-      },
-    };
-  }
-};
diff --git a/mobile/android/extensions/report-site-issue/experimentalAPIs/snackbars.json b/mobile/android/extensions/report-site-issue/experimentalAPIs/snackbars.json
deleted file mode 100644
index f41d8cb0ab91..000000000000
--- a/mobile/android/extensions/report-site-issue/experimentalAPIs/snackbars.json
+++ /dev/null
@@ -1,21 +0,0 @@
-[
-  {
-    "namespace": "snackbars",
-    "description": "experimental API extensions for prompting the user via Android Snackbar notifications",
-    "functions": [
-      {
-        "name": "show",
-        "type": "function",
-        "description": "Shows a Snackbar with the given message and button",
-        "parameters": [{
-          "name": "message",
-          "type": "string"
-        },{
-          "name": "button",
-          "type": "string"
-        }],
-        "async": true
-      }
-    ]
-  }
-]
diff --git a/mobile/android/extensions/report-site-issue/experimentalAPIs/tabExtras.js b/mobile/android/extensions/report-site-issue/experimentalAPIs/tabExtras.js
deleted file mode 100644
index 9515e7dfdea8..000000000000
--- a/mobile/android/extensions/report-site-issue/experimentalAPIs/tabExtras.js
+++ /dev/null
@@ -1,327 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* global ChromeUtils, ExtensionAPI, ExtensionCommon, XPCOMUtils */
-
-var Services;
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "EventDispatcher",
-  "resource://gre/modules/Messaging.jsm"
-);
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "PrivateBrowsingUtils",
-  "resource://gre/modules/PrivateBrowsingUtils.jsm"
-);
-
-XPCOMUtils.defineLazyGlobalGetters(this, ["URL"]);
-
-XPCOMUtils.defineLazyGetter(
-  this,
-  "GlobalEventDispatcher",
-  () => EventDispatcher.instance
-);
-
-function getInfoFrameScript(messageName) {
-  /* eslint-env mozilla/frame-script */
-
-  ({ Services } = ChromeUtils.import("resource://gre/modules/Services.jsm"));
-  const PREVIEW_MAX_ITEMS = 10;
-  const LOG_LEVEL_MAP = {
-    0: "debug",
-    1: "info",
-    2: "warn",
-    3: "error",
-  };
-
-  function getInnerWindowId(window) {
-    return window.windowUtils.currentInnerWindowID;
-  }
-
-  function getInnerWindowIDsForAllFrames(window) {
-    const innerWindowID = getInnerWindowId(window);
-    let ids = [innerWindowID];
-
-    if (window.frames) {
-      for (let i = 0; i < window.frames.length; i++) {
-        ids = ids.concat(getInnerWindowIDsForAllFrames(window.frames[i]));
-      }
-    }
-
-    return ids;
-  }
-
-  function getLoggedMessages(window, includePrivate = false) {
-    const ids = getInnerWindowIDsForAllFrames(window);
-    return getConsoleMessages(ids)
-      .concat(getScriptErrors(ids, includePrivate))
-      .sort((a, b) => a.timeStamp - b.timeStamp)
-      .map(m => m.message);
-  }
-
-  function getPreview(value) {
-    switch (typeof value) {
-      case "function":
-        return "function ()";
-
-      case "object":
-        if (value === null) {
-          return null;
-        }
-
-        if (Array.isArray(value)) {
-          return `(${value.length})[...]`;
-        }
-
-        return "{...}";
-
-      case "undefined":
-        return "undefined";
-
-      default:
-        return value;
-    }
-  }
-
-  function getArrayPreview(arr) {
-    const preview = [];
-    for (const value of arr) {
-      preview.push(getPreview(value));
-
-      if (preview.length === PREVIEW_MAX_ITEMS) {
-        break;
-      }
-    }
-
-    return preview;
-  }
-
-  function getObjectPreview(obj) {
-    const preview = {};
-    for (const key in obj) {
-      if (obj.hasOwnProperty(key)) {
-        preview[key] = getPreview(obj[key]);
-      }
-
-      if (Object.keys(preview).length === PREVIEW_MAX_ITEMS) {
-        break;
-      }
-    }
-
-    return preview;
-  }
-
-  function getArgs(value) {
-    if (typeof value === "object" && value !== null) {
-      if (Array.isArray(value)) {
-        return getArrayPreview(value);
-      }
-
-      return getObjectPreview(value);
-    }
-
-    return getPreview(value);
-  }
-
-  function getConsoleMessages(windowIds) {
-    const ConsoleAPIStorage = Cc[
-      "@mozilla.org/consoleAPI-storage;1"
-    ].getService(Ci.nsIConsoleAPIStorage);
-    let messages = [];
-    for (const id of windowIds) {
-      messages = messages.concat(ConsoleAPIStorage.getEvents(id) || []);
-    }
-    return messages.map(evt => {
-      const { columnNumber, filename, level, lineNumber, timeStamp } = evt;
-      const args = evt.arguments.map(getArgs);
-
-      const message = {
-        level,
-        log: args,
-        uri: filename,
-        pos: `${lineNumber}:${columnNumber}`,
-      };
-
-      return { timeStamp, message };
-    });
-  }
-
-  function getScriptErrors(windowIds, includePrivate = false) {
-    const messages = Services.console.getMessageArray() || [];
-    return messages
-      .filter(message => {
-        if (message instanceof Ci.nsIScriptError) {
-          if (!includePrivate && message.isFromPrivateWindow) {
-            return false;
-          }
-
-          if (windowIds && !windowIds.includes(message.innerWindowID)) {
-            return false;
-          }
-
-          return true;
-        }
-
-        // If this is not an nsIScriptError and we need to do window-based
-        // filtering we skip this message.
-        return false;
-      })
-      .map(error => {
-        const {
-          timeStamp,
-          errorMessage,
-          sourceName,
-          lineNumber,
-          columnNumber,
-          logLevel,
-        } = error;
-        const message = {
-          level: LOG_LEVEL_MAP[logLevel],
-          log: [errorMessage],
-          uri: sourceName,
-          pos: `${lineNumber}:${columnNumber}`,
-        };
-
-        return { timeStamp, message };
-      });
-  }
-
-  sendAsyncMessage(messageName, {
-    hasMixedActiveContentBlocked: docShell.hasMixedActiveContentBlocked,
-    hasMixedDisplayContentBlocked: docShell.hasMixedDisplayContentBlocked,
-    hasTrackingContentBlocked: docShell.hasTrackingContentBlocked,
-    log: getLoggedMessages(content, true), // also on private tabs
-  });
-}
-
-this.tabExtras = class extends ExtensionAPI {
-  getAPI(context) {
-    const EventManager = ExtensionCommon.EventManager;
-    const { tabManager } = context.extension;
-    const {
-      Management: {
-        global: { windowTracker },
-      },
-    } = ChromeUtils.import("resource://gre/modules/Extension.jsm", null);
-    return {
-      tabExtras: {
-        onDesktopSiteRequested: new EventManager({
-          context,
-          name: "tabExtras.onDesktopSiteRequested",
-          register: fire => {
-            const callback = tab => {
-              fire.async(tab).catch(() => {}); // ignore Message Manager disconnects
-            };
-            const listener = {
-              onEvent: (event, data, _callback) => {
-                if (event === "DesktopMode:Change" && data.desktopMode) {
-                  callback(data.tabId);
-                }
-              },
-            };
-            GlobalEventDispatcher.registerListener(
-              listener,
-              "DesktopMode:Change"
-            );
-            return () => {
-              GlobalEventDispatcher.unregisterListener(
-                listener,
-                "DesktopMode:Change"
-              );
-            };
-          },
-        }).api(),
-        async createPrivateTab() {
-          const { BrowserApp } = windowTracker.topWindow;
-          const nativeTab = BrowserApp.addTab("about:blank", {
-            selected: true,
-            isPrivate: true,
-          });
-          return Promise.resolve(tabManager.convert(nativeTab));
-        },
-        async loadURIWithPostData(
-          tabId,
-          url,
-          postDataString,
-          postDataContentType
-        ) {
-          const tab = tabManager.get(tabId);
-          if (!tab || !tab.browser) {
-            return Promise.reject("Invalid tab");
-          }
-
-          try {
-            new URL(url);
-          } catch (_) {
-            return Promise.reject("Invalid url");
-          }
-
-          if (
-            typeof postDataString !== "string" &&
-            !(postDataString instanceof String)
-          ) {
-            return Promise.reject("postDataString must be a string");
-          }
-
-          const stringStream = Cc[
-            "@mozilla.org/io/string-input-stream;1"
-          ].createInstance(Ci.nsIStringInputStream);
-          stringStream.data = postData;
-          const postData = Cc[
-            "@mozilla.org/network/mime-input-stream;1"
-          ].createInstance(Ci.nsIMIMEInputStream);
-          postData.addHeader(
-            "Content-Type",
-            postDataContentType || "application/x-www-form-urlencoded"
-          );
-          postData.setData(stringStream);
-
-          return new Promise(resolve => {
-            const listener = {
-              onLocationChange(
-                browser,
-                webProgress,
-                request,
-                locationURI,
-                flags
-              ) {
-                if (
-                  webProgress.isTopLevel &&
-                  browser === tab.browser &&
-                  locationURI.spec === url
-                ) {
-                  windowTracker.removeListener("progress", listener);
-                  resolve();
-                }
-              },
-            };
-            windowTracker.addListener("progress", listener);
-            let loadURIOptions = {
-              triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
-              postData,
-            };
-            tab.browser.webNavigation.loadURI(url, loadURIOptions);
-          });
-        },
-        async getWebcompatInfo(tabId) {
-          return new Promise(resolve => {
-            const messageName = "WebExtension:GetWebcompatInfo";
-            const code = `${getInfoFrameScript.toString()};getInfoFrameScript("${messageName}")`;
-            const mm = tabManager.get(tabId).browser.messageManager;
-            mm.loadFrameScript(`data:,${encodeURI(code)}`, false);
-            mm.addMessageListener(messageName, function receiveFn(message) {
-              mm.removeMessageListener(messageName, receiveFn);
-              resolve(message.json);
-            });
-          });
-        },
-      },
-    };
-  }
-};
diff --git a/mobile/android/extensions/report-site-issue/experimentalAPIs/tabExtras.json b/mobile/android/extensions/report-site-issue/experimentalAPIs/tabExtras.json
deleted file mode 100644
index e1d17a20c294..000000000000
--- a/mobile/android/extensions/report-site-issue/experimentalAPIs/tabExtras.json
+++ /dev/null
@@ -1,57 +0,0 @@
-[
-  {
-    "namespace": "tabExtras",
-    "description": "experimental tab API extensions",
-    "events": [{
-      "name": "onDesktopSiteRequested",
-      "type": "function",
-      "parameters": [
-        {
-          "name": "tabId",
-          "type": "integer",
-          "description": "The related tab's id"
-        }
-      ]
-    }],
-    "functions": [
-      {
-        "name": "createPrivateTab",
-        "type": "function",
-        "description": "Create and select a new private about:blank tab",
-        "parameters": [],
-        "async": true
-      },
-      {
-        "name": "getWebcompatInfo",
-        "type": "function",
-        "description": "Gets the content blocking status and script log for a given tab",
-        "parameters": [{
-          "type": "integer",
-          "name": "tabId",
-          "minimum": 0
-        }],
-        "async": true
-      },
-      {
-        "name": "loadURIWithPostData",
-        "type": "function",
-        "description": "Loads a URI on the given tab using a POST request",
-        "parameters": [{
-          "type": "integer",
-          "name": "tabId",
-          "minimum": 0
-        }, {
-          "type": "string",
-          "name": "url"
-        }, {
-          "type": "string",
-          "name": "postData"
-        }, {
-          "type": "string",
-          "name": "postDataContentType"
-        }],
-        "async": true
-      }
-    ]
-  }
-]
diff --git a/mobile/android/extensions/report-site-issue/manifest.json b/mobile/android/extensions/report-site-issue/manifest.json
deleted file mode 100644
index fc84af62a29f..000000000000
--- a/mobile/android/extensions/report-site-issue/manifest.json
+++ /dev/null
@@ -1,72 +0,0 @@
-{
-  "manifest_version": 2,
-  "name": "WebCompat Reporter",
-  "description": "Report site compatibility issues on webcompat.com",
-  "author": "Thomas Wisniewski <twisniewski@mozilla.com>",
-  "version": "1.1.0",
-  "homepage_url": "https://github.com/mozilla/webcompat-reporter",
-  "applications": {
-    "gecko": {
-      "id": "webcompat-reporter@mozilla.org"
-    }
-  },
-  "experiment_apis": {
-    "aboutConfigPrefs": {
-      "schema": "experimentalAPIs/aboutConfigPrefs.json",
-      "parent": {
-        "scopes": ["addon_parent"],
-        "script": "experimentalAPIs/aboutConfigPrefs.js",
-        "paths": [["aboutConfigPrefs"]]
-      }
-    },
-    "browserInfo": {
-      "schema": "experimentalAPIs/browserInfo.json",
-      "parent": {
-        "scopes": ["addon_parent"],
-        "script": "experimentalAPIs/browserInfo.js",
-        "paths": [["browserInfo"]]
-      }
-    },
-    "l10n": {
-      "schema": "experimentalAPIs/l10n.json",
-      "parent": {
-        "scopes": ["addon_parent"],
-        "script": "experimentalAPIs/l10n.js",
-        "paths": [["l10n"]]
-      }
-    },
-    "nativeMenu": {
-      "schema": "experimentalAPIs/nativeMenu.json",
-      "parent": {
-        "scopes": ["addon_parent"],
-        "script": "experimentalAPIs/nativeMenu.js",
-        "paths": [["nativeMenu"]]
-      }
-    },
-    "snackbars": {
-      "schema": "experimentalAPIs/snackbars.json",
-      "parent": {
-        "scopes": ["addon_parent"],
-        "script": "experimentalAPIs/snackbars.js",
-        "paths": [["snackbars"]]
-      }
-    },
-    "tabExtras": {
-      "schema": "experimentalAPIs/tabExtras.json",
-      "parent": {
-        "scopes": ["addon_parent"],
-        "script": "experimentalAPIs/tabExtras.js",
-        "paths": [["tabExtras"]]
-      }
-    }
-  },
-  "permissions": [
-    "tabs",
-    "<all_urls>"
-  ],
-  "background": {
-    "scripts": [
-      "background.js"
-    ]
-  }
-}
diff --git a/mobile/android/extensions/report-site-issue/moz.build b/mobile/android/extensions/report-site-issue/moz.build
deleted file mode 100644
index cbb590bd1ee8..000000000000
--- a/mobile/android/extensions/report-site-issue/moz.build
+++ /dev/null
@@ -1,31 +0,0 @@
-# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-DEFINES['MOZ_APP_VERSION'] = CONFIG['MOZ_APP_VERSION']
-DEFINES['MOZ_APP_MAXVERSION'] = CONFIG['MOZ_APP_MAXVERSION']
-
-FINAL_TARGET_FILES.features['webcompat-reporter@mozilla.org'] += [
-  'background.js',
-  'manifest.json'
-]
-
-FINAL_TARGET_FILES.features['webcompat-reporter@mozilla.org'].experimentalAPIs += [
-  'experimentalAPIs/aboutConfigPrefs.js',
-  'experimentalAPIs/aboutConfigPrefs.json',
-  'experimentalAPIs/browserInfo.js',
-  'experimentalAPIs/browserInfo.json',
-  'experimentalAPIs/l10n.js',
-  'experimentalAPIs/l10n.json',
-  'experimentalAPIs/nativeMenu.js',
-  'experimentalAPIs/nativeMenu.json',
-  'experimentalAPIs/snackbars.js',
-  'experimentalAPIs/snackbars.json',
-  'experimentalAPIs/tabExtras.js',
-  'experimentalAPIs/tabExtras.json'
-]
-
-with Files('**'):
-    BUG_COMPONENT = ('Web Compatibility Tools', 'General')
diff --git a/mobile/android/extensions/webcompat/about-compat/AboutCompat.jsm b/mobile/android/extensions/webcompat/about-compat/AboutCompat.jsm
deleted file mode 100644
index 4c883b02558a..000000000000
--- a/mobile/android/extensions/webcompat/about-compat/AboutCompat.jsm
+++ /dev/null
@@ -1,37 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-var EXPORTED_SYMBOLS = ["AboutCompat"];
-
-const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
-
-const addonID = "webcompat@mozilla.org";
-const addonPageRelativeURL = "/about-compat/aboutCompat.html";
-
-function AboutCompat() {
-  this.chromeURL = WebExtensionPolicy.getByID(addonID).getURL(
-    addonPageRelativeURL
-  );
-}
-AboutCompat.prototype = {
-  QueryInterface: ChromeUtils.generateQI([Ci.nsIAboutModule]),
-  getURIFlags() {
-    return Ci.nsIAboutModule.URI_MUST_LOAD_IN_EXTENSION_PROCESS;
-  },
-
-  newChannel(aURI, aLoadInfo) {
-    const uri = Services.io.newURI(this.chromeURL);
-    const channel = Services.io.newChannelFromURIWithLoadInfo(uri, aLoadInfo);
-    channel.originalURI = aURI;
-
-    channel.owner = (Services.scriptSecurityManager.createContentPrincipal ||
-      Services.scriptSecurityManager.createCodebasePrincipal)(
-      uri,
-      aLoadInfo.originAttributes
-    );
-    return channel;
-  },
-};
diff --git a/mobile/android/extensions/webcompat/about-compat/aboutCompat.css b/mobile/android/extensions/webcompat/about-compat/aboutCompat.css
deleted file mode 100644
index 8a81d622076c..000000000000
--- a/mobile/android/extensions/webcompat/about-compat/aboutCompat.css
+++ /dev/null
@@ -1,198 +0,0 @@
-@media (any-pointer: fine) {
-  :root {
-    font-family: sans-serif;
-    margin: 40px auto;
-    min-width: 30em;
-    max-width: 60em;
-  }
-
-  table {
-    width: 100%;
-    padding-bottom: 2em;
-  }
-
-  .hidden {
-    display: none;
-  }
-
-  .table-title-container {
-    align-items: center;
-    display: flex;
-    justify-content: space-between;
-  }
-
-  .wide-button {
-    display: block;
-    min-height: 32px;
-    padding-left: 30px;
-    padding-right: 30px;
-  }
-
-  .submitting {
-    background-image: url(chrome://global/skin/icons/loading.png);
-    background-position: center;
-    background-repeat: no-repeat;
-    background-size: 16px;
-  }
-
-  .submitting .submit-crash-button-label {
-    display: none;
-  }
-
-  .failed-to-submit {
-    color: #ca8695;
-  }
-
-  a.button-as-link {
-    -moz-appearance: none;
-    min-height: 30px;
-    color: var(--in-content-text-color) !important;
-    border: 1px solid var(--in-content-box-border-color) !important;
-    border-radius: 2px;
-    background-color: var(--in-content-page-background);
-    line-height: 30px;
-    margin: 4px 8px;
-    /* Ensure font-size isn't overridden by widget styling (e.g. in forms.css) */
-    font-size: 1em;
-  }
-
-  a.button-as-link:hover {
-    background-color: var(--in-content-box-background-hover) !important;
-    text-decoration: none;
-  }
-
-  h2.lighter-font-weight {
-    font-weight: lighter;
-  }
-
-  html[dir="ltr"] th {
-    text-align: left;
-  }
-
-  html[dir="rtl"] th {
-    text-align: right;
-  }
-}
-
-@media (any-pointer: coarse), (any-pointer: none) {
-  * {
-    margin: 0;
-    padding: 0;
-  }
-
-  html {
-    font-family: sans-serif;
-    font-size: 14px;
-    -moz-text-size-adjust: none;
-    background-color: #f5f5f5;
-  }
-
-  table,
-  tr,
-  p {
-    display: block;
-    background: #fff;
-  }
-
-  table {
-    border-top: 2px solid #0a84ff;
-    margin-top: -2px;
-    position: absolute;
-    width: 100%;
-    z-index: 1;
-    display: none;
-  }
-
-  tr {
-    position: relative;
-    border-bottom: 1px solid #d7d9db;
-    padding: 1em;
-  }
-
-  a {
-    color: #000;
-    font-size: 94%;
-  }
-
-  .tab {
-    cursor: pointer;
-    position: relative;
-    z-index: 2;
-    display: inline-block;
-    text-align: left;
-    padding: 1em;
-    font-weight: bold;
-    border-top-left-radius: 3px;
-    border-top-right-radius: 3px;
-    border: 1px solid #d7d9db;
-    border-bottom: 0;
-    margin-bottom: 2px;
-    background: #f5f5f5;
-    color: #363b40;
-    font-size: 1em;
-    font-weight: bold;
-    padding: 1em;
-  }
-
-  .tab.active {
-    border-bottom-color: #fff;
-    background: #fff;
-    margin-bottom: 0;
-    padding-bottom: calc(1em + 2px);
-  }
-
-  .tab.active + table {
-    display: block;
-  }
-
-  td {
-    display: block;
-    position: relative;
-  }
-  td:dir(ltr) {
-    padding-right: 6.5em;
-  }
-  td:dir(rtl) {
-    padding-left: 6.5em;
-  }
-
-  td[colspan="4"] {
-    padding: 1em;
-    font-style: italic;
-    text-align: center;
-  }
-
-  td:not([colspan]):nth-child(1) {
-    font-weight: bold;
-  }
-
-  td:not([colspan]):nth-child(1) {
-    padding-bottom: 0.25em;
-  }
-
-  td:nth-child(3) {
-    display: contents;
-  }
-
-  button {
-    background: #e8e8e7;
-    position: absolute;
-    top: 0;
-    bottom: 0;
-    width: 6em;
-    border: 0;
-    border-left: 1px solid #d7d9db;
-    -moz-appearance: none;
-    color: #000;
-  }
-  button:dir(ltr) {
-    right: 0;
-  }
-  button:dir(rtl) {
-    left: 0;
-  }
-
-  button::-moz-focus-inner {
-    border: 0;
-  }
-}
diff --git a/mobile/android/extensions/webcompat/about-compat/aboutCompat.html b/mobile/android/extensions/webcompat/about-compat/aboutCompat.html
deleted file mode 100644
index a1b4400bff1a..000000000000
--- a/mobile/android/extensions/webcompat/about-compat/aboutCompat.html
+++ /dev/null
@@ -1,33 +0,0 @@
-<!DOCTYPE HTML>
-<html>
-<head>
-  <base/>
-
-  <!-- If you change this script tag you must update the hash in the extension's
-         `content_security_policy` 'sha256-MmZkN2QaIHhfRWPZ8TVRjijTn5Ci1iEabtTEWrt9CCo=' -->
-  <script>/* globals browser */ document.head.firstElementChild.href = browser.runtime.getURL("");</script>
-
-  <meta charset="utf-8" />
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <link rel="stylesheet" href="about-compat/aboutCompat.css" />
-  <link rel="stylesheet" media="screen and (pointer:fine), projection" type="text/css"
-          href="chrome://global/skin/in-content/common.css"/>
-  <link rel="localization" href="toolkit/about/aboutCompat.ftl"/>
-  <title data-l10n-id="text-title"></title>
-  <script src="about-compat/aboutCompat.js"></script>
-  </head>
-<body>
-  <h2 class="tab active" data-l10n-id="label-overrides"></h2>
-  <table id="overrides">
-    <col/>
-    <col/>
-    <col/>
-  </table>
-  <h2 class="tab" data-l10n-id="label-interventions"></h2>
-  <table id="interventions">
-    <col/>
-    <col/>
-    <col/>
-  </table>
-</body>
-</html>
diff --git a/mobile/android/extensions/webcompat/about-compat/aboutCompat.js b/mobile/android/extensions/webcompat/about-compat/aboutCompat.js
deleted file mode 100644
index e5c9c4ff1711..000000000000
--- a/mobile/android/extensions/webcompat/about-compat/aboutCompat.js
+++ /dev/null
@@ -1,171 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* globals browser */
-
-let availablePatches;
-
-const portToAddon = (function() {
-  let port;
-
-  function connect() {
-    port = browser.runtime.connect({ name: "AboutCompatTab" });
-    port.onMessage.addListener(onMessageFromAddon);
-    port.onDisconnect.addListener(e => {
-      port = undefined;
-    });
-  }
-
-  connect();
-
-  async function send(message) {
-    if (port) {
-      return port.postMessage(message);
-    }
-    return Promise.reject("background script port disconnected");
-  }
-
-  return { send };
-})();
-
-const $ = function(sel) {
-  return document.querySelector(sel);
-};
-
-const DOMContentLoadedPromise = new Promise(resolve => {
-  document.addEventListener(
-    "DOMContentLoaded",
-    () => {
-      resolve();
-    },
-    { once: true }
-  );
-});
-
-Promise.all([
-  browser.runtime.sendMessage("getOverridesAndInterventions"),
-  DOMContentLoadedPromise,
-]).then(([info]) => {
-  document.body.addEventListener("click", async evt => {
-    const ele = evt.target;
-    if (ele.nodeName === "BUTTON") {
-      const row = ele.closest("[data-id]");
-      if (row) {
-        evt.preventDefault();
-        ele.disabled = true;
-        const id = row.getAttribute("data-id");
-        try {
-          await browser.runtime.sendMessage({ command: "toggle", id });
-        } catch (_) {
-          ele.disabled = false;
-        }
-      }
-    } else if (ele.classList.contains("tab")) {
-      document.querySelectorAll(".tab").forEach(tab => {
-        tab.classList.remove("active");
-      });
-      ele.classList.add("active");
-    }
-  });
-
-  availablePatches = info;
-  redraw();
-});
-
-function onMessageFromAddon(msg) {
-  if ("interventionsChanged" in msg) {
-    redrawTable($("#interventions"), msg.interventionsChanged);
-  }
-
-  if ("overridesChanged" in msg) {
-    redrawTable($("#overrides"), msg.overridesChanged);
-  }
-
-  const id = msg.toggling || msg.toggled;
-  const button = $(`[data-id="${id}"] button`);
-  if (!button) {
-    return;
-  }
-  const active = msg.active;
-  document.l10n.setAttributes(
-    button,
-    active ? "label-disable" : "label-enable"
-  );
-  button.disabled = !!msg.toggling;
-}
-
-function redraw() {
-  if (!availablePatches) {
-    return;
-  }
-  const { overrides, interventions } = availablePatches;
-  const showHidden = location.hash === "#all";
-  redrawTable($("#overrides"), overrides, showHidden);
-  redrawTable($("#interventions"), interventions, showHidden);
-}
-
-function redrawTable(table, data, showHidden = false) {
-  const df = document.createDocumentFragment();
-  table.querySelectorAll("tr").forEach(tr => {
-    tr.remove();
-  });
-
-  let noEntriesMessage;
-  if (data === false) {
-    noEntriesMessage = "text-disabled-in-about-config";
-  } else if (data.length === 0) {
-    noEntriesMessage =
-      table.id === "overrides" ? "text-no-overrides" : "text-no-interventions";
-  }
-
-  if (noEntriesMessage) {
-    const tr = document.createElement("tr");
-    df.appendChild(tr);
-
-    const td = document.createElement("td");
-    td.setAttribute("colspan", "3");
-    document.l10n.setAttributes(td, noEntriesMessage);
-    tr.appendChild(td);
-
-    table.appendChild(df);
-    return;
-  }
-
-  for (const row of data) {
-    if (row.hidden && !showHidden) {
-      continue;
-    }
-
-    const tr = document.createElement("tr");
-    tr.setAttribute("data-id", row.id);
-    df.appendChild(tr);
-
-    let td = document.createElement("td");
-    td.innerText = row.domain;
-    tr.appendChild(td);
-
-    td = document.createElement("td");
-    const a = document.createElement("a");
-    const bug = row.bug;
-    a.href = `https://bugzilla.mozilla.org/show_bug.cgi?id=${bug}`;
-    document.l10n.setAttributes(a, "label-more-information", { bug });
-    a.target = "_blank";
-    td.appendChild(a);
-    tr.appendChild(td);
-
-    td = document.createElement("td");
-    tr.appendChild(td);
-    const button = document.createElement("button");
-    document.l10n.setAttributes(
-      button,
-      row.active ? "label-disable" : "label-enable"
-    );
-    td.appendChild(button);
-  }
-  table.appendChild(df);
-}
-
-window.onhashchange = redraw;
diff --git a/mobile/android/extensions/webcompat/about-compat/aboutPage.js b/mobile/android/extensions/webcompat/about-compat/aboutPage.js
deleted file mode 100644
index 47dabcdf6db0..000000000000
--- a/mobile/android/extensions/webcompat/about-compat/aboutPage.js
+++ /dev/null
@@ -1,42 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* global ExtensionAPI, Services, XPCOMUtils */
-
-ChromeUtils.defineModuleGetter(
-  this,
-  "Services",
-  "resource://gre/modules/Services.jsm"
-);
-
-XPCOMUtils.defineLazyServiceGetter(
-  this,
-  "resProto",
-  "@mozilla.org/network/protocol;1?name=resource",
-  "nsISubstitutingProtocolHandler"
-);
-
-const ResourceSubstitution = "webcompat";
-const ProcessScriptURL = "resource://webcompat/aboutPageProcessScript.js";
-
-this.aboutPage = class extends ExtensionAPI {
-  onStartup() {
-    const { rootURI } = this.extension;
-
-    resProto.setSubstitution(
-      ResourceSubstitution,
-      Services.io.newURI("about-compat/", null, rootURI)
-    );
-
-    Services.ppmm.loadProcessScript(ProcessScriptURL, true);
-  }
-
-  onShutdown() {
-    resProto.setSubstitution(ResourceSubstitution, null);
-
-    Services.ppmm.removeDelayedProcessScript(ProcessScriptURL);
-  }
-};
diff --git a/mobile/android/extensions/webcompat/about-compat/aboutPage.json b/mobile/android/extensions/webcompat/about-compat/aboutPage.json
deleted file mode 100644
index 25e1941abd53..000000000000
--- a/mobile/android/extensions/webcompat/about-compat/aboutPage.json
+++ /dev/null
@@ -1,4 +0,0 @@
-[{
-    "namespace": "aboutCompat",
-    "description": "Enables the about:compat page"
-}]
diff --git a/mobile/android/extensions/webcompat/about-compat/aboutPageProcessScript.js b/mobile/android/extensions/webcompat/about-compat/aboutPageProcessScript.js
deleted file mode 100644
index ab4af8f466dd..000000000000
--- a/mobile/android/extensions/webcompat/about-compat/aboutPageProcessScript.js
+++ /dev/null
@@ -1,29 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-const Cm = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
-
-const classID = Components.ID("{97bf9550-2a7b-11e9-b56e-0800200c9a66}");
-
-if (!Cm.isCIDRegistered(classID)) {
-  const { XPCOMUtils } = ChromeUtils.import(
-    "resource://gre/modules/XPCOMUtils.jsm"
-  );
-
-  const factory = XPCOMUtils.generateSingletonFactory(function() {
-    const { AboutCompat } = ChromeUtils.import(
-      "resource://webcompat/AboutCompat.jsm"
-    );
-    return new AboutCompat();
-  });
-
-  Cm.registerFactory(
-    classID,
-    "about:compat",
-    "@mozilla.org/network/protocol/about;1?what=compat",
-    factory
-  );
-}
diff --git a/mobile/android/extensions/webcompat/data/injections.js b/mobile/android/extensions/webcompat/data/injections.js
deleted file mode 100644
index 6eea7e2d3e6a..000000000000
--- a/mobile/android/extensions/webcompat/data/injections.js
+++ /dev/null
@@ -1,426 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* globals module */
-
-/**
- * For detailed information on our policies, and a documention on this format
- * and its possibilites, please check the Mozilla-Wiki at
- *
- * https://wiki.mozilla.org/Compatibility/Go_Faster_Addon/Override_Policies_and_Workflows#User_Agent_overrides
- */
-const AVAILABLE_INJECTIONS = [
-  {
-    id: "testbed-injection",
-    platform: "all",
-    domain: "webcompat-addon-testbed.herokuapp.com",
-    bug: "0000000",
-    hidden: true,
-    contentScripts: {
-      matches: ["*://webcompat-addon-testbed.herokuapp.com/*"],
-      css: [
-        {
-          file: "injections/css/bug0000000-testbed-css-injection.css",
-        },
-      ],
-      js: [
-        {
-          file: "injections/js/bug0000000-testbed-js-injection.js",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1452707",
-    platform: "desktop",
-    domain: "ib.absa.co.za",
-    bug: "1452707",
-    contentScripts: {
-      matches: ["https://ib.absa.co.za/*"],
-      js: [
-        {
-          file:
-            "injections/js/bug1452707-window.controllers-shim-ib.absa.co.za.js",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1457335",
-    platform: "desktop",
-    domain: "histography.io",
-    bug: "1457335",
-    contentScripts: {
-      matches: ["*://histography.io/*"],
-      js: [
-        {
-          file: "injections/js/bug1457335-histography.io-ua-change.js",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1472075",
-    platform: "desktop",
-    domain: "bankofamerica.com",
-    bug: "1472075",
-    contentScripts: {
-      matches: ["*://*.bankofamerica.com/*"],
-      js: [
-        {
-          file: "injections/js/bug1472075-bankofamerica.com-ua-change.js",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1472081",
-    platform: "desktop",
-    domain: "election.gov.np",
-    bug: "1472081",
-    contentScripts: {
-      matches: ["http://202.166.205.141/bbvrs/*"],
-      allFrames: true,
-      js: [
-        {
-          file:
-            "injections/js/bug1472081-election.gov.np-window.sidebar-shim.js",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1482066",
-    platform: "desktop",
-    domain: "portalminasnet.com",
-    bug: "1482066",
-    contentScripts: {
-      matches: ["*://portalminasnet.com/*"],
-      allFrames: true,
-      js: [
-        {
-          file:
-            "injections/js/bug1482066-portalminasnet.com-window.sidebar-shim.js",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1570856",
-    platform: "android",
-    domain: "medium.com",
-    bug: "1570856",
-    contentScripts: {
-      matches: ["*://medium.com/*"],
-      js: [
-        {
-          file: "injections/js/bug1570856-medium.com-menu-isTier1.js",
-        },
-      ],
-      allFrames: true,
-    },
-  },
-  {
-    id: "bug1579159",
-    platform: "android",
-    domain: "m.tailieu.vn",
-    bug: "1579159",
-    contentScripts: {
-      matches: ["*://m.tailieu.vn/*", "*://m.elib.vn/*"],
-      js: [
-        {
-          file: "injections/js/bug1579159-m.tailieu.vn-pdfjs-worker-disable.js",
-        },
-      ],
-      allFrames: true,
-    },
-  },
-  {
-    id: "bug1577245",
-    platform: "android",
-    domain: "help.pandora.com",
-    bug: "1577245",
-    contentScripts: {
-      matches: [
-        "https://faq.usps.com/*",
-        "https://help.duo.com/*",
-        "https://help.hulu.com/*",
-        "https://help.pandora.com/*",
-        "https://my211.force.com/*",
-        "https://support.paypay.ne.jp/*",
-        "https://usps.force.com/*",
-      ],
-      js: [
-        {
-          file:
-            "injections/js/bug1577245-salesforce-communities-hide-unsupported.js",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1526977",
-    platform: "desktop",
-    domain: "sreedharscce.in",
-    bug: "1526977",
-    contentScripts: {
-      matches: ["*://*.sreedharscce.in/authenticate"],
-      css: [
-        {
-          file: "injections/css/bug1526977-sreedharscce.in-login-fix.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1518781",
-    platform: "desktop",
-    domain: "twitch.tv",
-    bug: "1518781",
-    contentScripts: {
-      matches: ["*://*.twitch.tv/*"],
-      css: [
-        {
-          file: "injections/css/bug1518781-twitch.tv-webkit-scrollbar.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1551672",
-    platform: "android",
-    domain: "Sites using PDK 5 video",
-    bug: "1551672",
-    data: {
-      urls: ["https://*/*/tpPdk.js", "https://*/*/pdk/js/*/*.js"],
-      types: ["script"],
-    },
-    customFunc: "pdk5fix",
-  },
-  {
-    id: "bug1577870",
-    platform: "desktop",
-    domain: "Download prompt for files with no content-type",
-    bug: "1577870",
-    data: {
-      urls: [
-        "https://*.linkedin.com/tscp-serving/dtag*",
-        "https://ads-us.rd.linksynergy.com/as.php*",
-        "https://www.office.com/logout?sid*",
-      ],
-      contentType: {
-        name: "content-type",
-        value: "text/html; charset=utf-8",
-      },
-    },
-    customFunc: "noSniffFix",
-  },
-  {
-    id: "bug1305028",
-    platform: "desktop",
-    domain: "gaming.youtube.com",
-    bug: "1305028",
-    contentScripts: {
-      matches: ["*://gaming.youtube.com/*"],
-      css: [
-        {
-          file:
-            "injections/css/bug1305028-gaming.youtube.com-webkit-scrollbar.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1432935-discord",
-    platform: "desktop",
-    domain: "discordapp.com",
-    bug: "1432935",
-    contentScripts: {
-      matches: ["*://discordapp.com/*"],
-      css: [
-        {
-          file:
-            "injections/css/bug1432935-discordapp.com-webkit-scorllbar-white-line.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1561371",
-    platform: "android",
-    domain: "mail.google.com",
-    bug: "1561371",
-    contentScripts: {
-      matches: ["*://mail.google.com/*"],
-      css: [
-        {
-          file:
-            "injections/css/bug1561371-mail.google.com-allow-horizontal-scrolling.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1567610",
-    platform: "all",
-    domain: "dns.google.com",
-    bug: "1567610",
-    contentScripts: {
-      matches: ["*://dns.google.com/*", "*://dns.google/*"],
-      css: [
-        {
-          file: "injections/css/bug1567610-dns.google.com-moz-fit-content.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1568256",
-    platform: "android",
-    domain: "zertifikate.commerzbank.de",
-    bug: "1568256",
-    contentScripts: {
-      matches: ["*://*.zertifikate.commerzbank.de/webforms/mobile/*"],
-      css: [
-        {
-          file: "injections/css/bug1568256-zertifikate.commerzbank.de-flex.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1568908",
-    platform: "desktop",
-    domain: "console.cloud.google.com",
-    bug: "1568908",
-    contentScripts: {
-      matches: ["*://*.console.cloud.google.com/*"],
-      css: [
-        {
-          file:
-            "injections/css/bug1568908-console.cloud.google.com-scrollbar-fix.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1570119",
-    platform: "desktop",
-    domain: "teamcoco.com",
-    bug: "1570119",
-    contentScripts: {
-      matches: ["*://teamcoco.com/*"],
-      css: [
-        {
-          file: "injections/css/bug1570119-teamcoco.com-scrollbar-width.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1570328",
-    platform: "android",
-    domain: "developer.apple.com",
-    bug: "1570328",
-    contentScripts: {
-      matches: ["*://developer.apple.com/*"],
-      css: [
-        {
-          file:
-            "injections/css/bug1570328-developer-apple.com-transform-scale.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1574973",
-    platform: "android",
-    domain: "patch.com",
-    bug: "1574973",
-    contentScripts: {
-      matches: ["*://patch.com/*"],
-      css: [
-        {
-          file: "injections/css/bug1574973-patch.com-dropdown-menu-fix.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1575000",
-    platform: "all",
-    domain: "apply.lloydsbank.co.uk",
-    bug: "1575000",
-    contentScripts: {
-      matches: ["*://apply.lloydsbank.co.uk/*"],
-      css: [
-        {
-          file:
-            "injections/css/bug1575000-apply.lloydsbank.co.uk-radio-buttons-fix.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1575011",
-    platform: "android",
-    domain: "holiday-weather.com",
-    bug: "1575011",
-    contentScripts: {
-      matches: ["*://*.holiday-weather.com/*"],
-      css: [
-        {
-          file:
-            "injections/css/bug1575011-holiday-weather.com-scrolling-fix.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1575017",
-    platform: "desktop",
-    domain: "dunkindonuts.com",
-    bug: "1575017",
-    contentScripts: {
-      matches: ["*://*.dunkindonuts.com/en/sign-in*"],
-      css: [
-        {
-          file: "injections/css/bug1575017-dunkindonuts.com-flex-basis.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1577270",
-    platform: "android",
-    domain: "binance.com",
-    bug: "1577270",
-    contentScripts: {
-      matches: ["*://*.binance.com/*"],
-      css: [
-        {
-          file: "injections/css/bug1577270-binance.com-calc-height-fix.css",
-        },
-      ],
-    },
-  },
-  {
-    id: "bug1577297",
-    platform: "android",
-    domain: "kitkat.com.au",
-    bug: "1577297",
-    contentScripts: {
-      matches: ["*://*.kitkat.com.au/*"],
-      css: [
-        {
-          file: "injections/css/bug1577297-kitkat.com.au-slider-width-fix.css",
-        },
-      ],
-    },
-  },
-];
-
-module.exports = AVAILABLE_INJECTIONS;
diff --git a/mobile/android/extensions/webcompat/data/ua_overrides.js b/mobile/android/extensions/webcompat/data/ua_overrides.js
deleted file mode 100644
index fb2f5531cd99..000000000000
--- a/mobile/android/extensions/webcompat/data/ua_overrides.js
+++ /dev/null
@@ -1,580 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* globals module, require */
-
-// This is a hack for the tests.
-if (typeof getMatchPatternsForGoogleURL === "undefined") {
-  var getMatchPatternsForGoogleURL = require("../lib/google");
-}
-
-/**
- * For detailed information on our policies, and a documention on this format
- * and its possibilites, please check the Mozilla-Wiki at
- *
- * https://wiki.mozilla.org/Compatibility/Go_Faster_Addon/Override_Policies_and_Workflows#User_Agent_overrides
- */
-const AVAILABLE_UA_OVERRIDES = [
-  {
-    id: "testbed-override",
-    platform: "all",
-    domain: "webcompat-addon-testbed.herokuapp.com",
-    bug: "0000000",
-    config: {
-      hidden: true,
-      matches: ["*://webcompat-addon-testbed.herokuapp.com/*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.98 Safari/537.36 for WebCompat"
-        );
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1564594 - Create UA override for Enhanced Search on Firefox Android
-     *
-     * Enables the Chrome Google Search experience for Fennec users.
-     */
-    id: "bug1564594",
-    platform: "android",
-    domain: "Enhanced Search",
-    bug: "1567945",
-    config: {
-      matches: [
-        ...getMatchPatternsForGoogleURL("images.google"),
-        ...getMatchPatternsForGoogleURL("maps.google"),
-        ...getMatchPatternsForGoogleURL("news.google"),
-        ...getMatchPatternsForGoogleURL("www.google"),
-      ],
-      blocks: [...getMatchPatternsForGoogleURL("www.google", "serviceworker")],
-      permanentPref: "enable_enhanced_search",
-      telemetryKey: "enhancedSearch",
-      experiment: ["enhanced-search", "enhanced-search-control"],
-      uaTransformer: originalUA => {
-        return UAHelpers.getDeviceAppropriateChromeUA();
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1563839 - rolb.santanderbank.com - Build UA override
-     * WebCompat issue #33462 - https://webcompat.com/issues/33462
-     *
-     * santanderbank expects UA to have 'like Gecko', otherwise it runs
-     * xmlDoc.onload whose support has been dropped. It results in missing labels in forms
-     * and some other issues.  Adding 'like Gecko' fixes those issues.
-     */
-    id: "bug1563839",
-    platform: "all",
-    domain: "rolb.santanderbank.com",
-    bug: "1563839",
-    config: {
-      matches: [
-        "*://*.santander.co.uk/*",
-        "*://bob.santanderbank.com/*",
-        "*://rolb.santanderbank.com/*",
-      ],
-      uaTransformer: originalUA => {
-        return originalUA.replace("Gecko", "like Gecko");
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1577179 - UA override for supportforms.embarcadero.com
-     * WebCompat issue #34682 - https://webcompat.com/issues/34682
-     *
-     * supportforms.embarcadero.com has a constant onchange event on a product selector
-     * which makes it unusable. Spoofing as Chrome allows to stop event from firing
-     */
-    id: "bug1577179",
-    platform: "all",
-    domain: "supportforms.embarcadero.com",
-    bug: "1577179",
-    config: {
-      matches: ["*://supportforms.embarcadero.com/*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36"
-        );
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1577519 - att.tv - Create a UA override for att.tv for playback on desktop
-     * WebCompat issue #3846 - https://webcompat.com/issues/3846
-     *
-     * att.tv (atttvnow.com) is blocking Firefox via UA sniffing. Spoofing as Chrome allows
-     * to access the site and playback works fine. This is former directvnow.com
-     */
-    id: "bug1577519",
-    platform: "desktop",
-    domain: "att.tv",
-    bug: "1577519",
-    config: {
-      matches: ["*://*.att.tv/*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36"
-        );
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1570108 - steamcommunity.com - UA override for steamcommunity.com
-     * WebCompat issue #34171 - https://webcompat.com/issues/34171
-     *
-     * steamcommunity.com blocks chat feature for Firefox users showing unsupported browser message.
-     * When spoofing as Chrome the chat works fine
-     */
-    id: "bug1570108",
-    platform: "desktop",
-    domain: "steamcommunity.com",
-    bug: "1570108",
-    config: {
-      matches: ["*://steamcommunity.com/chat*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36"
-        );
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1582582 - sling.com - UA override for sling.com
-     * WebCompat issue #17804 - https://webcompat.com/issues/17804
-     *
-     * sling.com blocks Firefox users showing unsupported browser message.
-     * When spoofing as Chrome playing content works fine
-     */
-    id: "bug1582582",
-    platform: "desktop",
-    domain: "sling.com",
-    bug: "1582582",
-    config: {
-      matches: ["https://watch.sling.com/*", "https://www.sling.com/*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36"
-        );
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1480710 - m.imgur.com - Build UA override
-     * WebCompat issue #13154 - https://webcompat.com/issues/13154
-     *
-     * imgur returns a 404 for requests to CSS and JS file if requested with a Fennec
-     * User Agent. By removing the Fennec identifies and adding Chrome Mobile's, we
-     * receive the correct CSS and JS files.
-     */
-    id: "bug1480710",
-    platform: "android",
-    domain: "m.imgur.com",
-    bug: "1480710",
-    config: {
-      matches: ["*://m.imgur.com/*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.85 Mobile Safari/537.36"
-        );
-      },
-    },
-  },
-  {
-    /*
-     * Bug 945963 - tieba.baidu.com serves simplified mobile content to Firefox Android
-     * WebCompat issue #18455 - https://webcompat.com/issues/18455
-     *
-     * tieba.baidu.com and tiebac.baidu.com serve a heavily simplified and less functional
-     * mobile experience to Firefox for Android users. Adding the AppleWebKit indicator
-     * to the User Agent gets us the same experience.
-     */
-    id: "bug945963",
-    platform: "android",
-    domain: "tieba.baidu.com",
-    bug: "945963",
-    config: {
-      matches: [
-        "*://tieba.baidu.com/*",
-        "*://tiebac.baidu.com/*",
-        "*://zhidao.baidu.com/*",
-      ],
-      uaTransformer: originalUA => {
-        return originalUA + " AppleWebKit/537.36 (KHTML, like Gecko)";
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1177298 - Write UA overrides for top Japanese Sites
-     * (Imported from ua-update.json.in)
-     *
-     * To receive the proper mobile version instead of the desktop version or
-     * a lower grade mobile experience, the UA is spoofed.
-     */
-    id: "bug1177298-2",
-    platform: "android",
-    domain: "lohaco.jp",
-    bug: "1177298",
-    config: {
-      matches: ["*://*.lohaco.jp/*"],
-      uaTransformer: _ => {
-        return "Mozilla/5.0 (Linux; Android 5.0.2; Galaxy Nexus Build/IMM76B) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.93 Mobile Safari/537.36";
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1177298 - Write UA overrides for top Japanese Sites
-     * (Imported from ua-update.json.in)
-     *
-     * To receive the proper mobile version instead of the desktop version or
-     * a lower grade mobile experience, the UA is spoofed.
-     */
-    id: "bug1177298-3",
-    platform: "android",
-    domain: "nhk.or.jp",
-    bug: "1177298",
-    config: {
-      matches: ["*://*.nhk.or.jp/*"],
-      uaTransformer: originalUA => {
-        return originalUA + " AppleWebKit";
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1338260 - Add UA override for directTV
-     * (Imported from ua-update.json.in)
-     *
-     * DirectTV has issues with scrolling and cut-off images. Pretending to be
-     * Chrome for Android fixes those issues.
-     */
-    id: "bug1338260",
-    platform: "android",
-    domain: "directv.com",
-    bug: "1338260",
-    config: {
-      matches: ["*://*.directv.com/*"],
-      uaTransformer: _ => {
-        return "Mozilla/5.0 (Linux; Android 6.0.1; SM-G920F Build/MMB29K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.91 Mobile Safari/537.36";
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1385206 - Create UA override for rakuten.co.jp on Firefox Android
-     * (Imported from ua-update.json.in)
-     *
-     * rakuten.co.jp serves a Desktop version if Firefox is included in the UA.
-     */
-    id: "bug1385206",
-    platform: "android",
-    domain: "rakuten.co.jp",
-    bug: "1385206",
-    config: {
-      matches: ["*://*.rakuten.co.jp/*"],
-      uaTransformer: originalUA => {
-        return originalUA.replace(/Firefox.+$/, "");
-      },
-    },
-  },
-  {
-    /*
-     * Bug 969844 - mobile.de sends desktop site to Firefox on Android
-     *
-     * mobile.de sends the desktop site to Fennec. Spooing as Chrome works fine.
-     */
-    id: "bug969844",
-    platform: "android",
-    domain: "mobile.de",
-    bug: "969844",
-    config: {
-      matches: ["*://*.mobile.de/*"],
-      uaTransformer: _ => {
-        return "Mozilla/5.0 (Linux; Android 6.0.1; SM-G920F Build/MMB29K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.91 Mobile Safari/537.36";
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1509831 - cc.com - Add UA override for CC.com
-     * WebCompat issue #329 - https://webcompat.com/issues/329
-     *
-     * ComedyCentral blocks Firefox for not being able to play HLS, which was
-     * true in previous versions, but no longer is. With a spoofed Chrome UA,
-     * the site works just fine.
-     */
-    id: "bug1509831",
-    platform: "android",
-    domain: "cc.com",
-    bug: "1509831",
-    config: {
-      matches: ["*://*.cc.com/*"],
-      uaTransformer: _ => {
-        return "Mozilla/5.0 (Linux; Android 6.0.1; SM-G920F Build/MMB29K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.91 Mobile Safari/537.36";
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1508516 - cineflix.com.br - Add UA override for cineflix.com.br/m/
-     * WebCompat issue #21553 - https://webcompat.com/issues/21553
-     *
-     * The site renders a blank page with any Firefox snipped in the UA as it
-     * is running into an exception. Spoofing as Chrome makes the site work
-     * fine.
-     */
-    id: "bug1508516",
-    platform: "android",
-    domain: "cineflix.com.br",
-    bug: "1508516",
-    config: {
-      matches: ["*://*.cineflix.com.br/m/*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.91 Mobile Safari/537.36"
-        );
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1509852 - redbull.com - Add UA override for redbull.com
-     * WebCompat issue #21439 - https://webcompat.com/issues/21439
-     *
-     * Redbull.com blocks some features, for example the live video player, for
-     * Fennec. Spoofing as Chrome results in us rendering the video just fine,
-     * and everything else works as well.
-     */
-    id: "bug1509852",
-    platform: "android",
-    domain: "redbull.com",
-    bug: "1509852",
-    config: {
-      matches: ["*://*.redbull.com/*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.91 Mobile Safari/537.36"
-        );
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1509873 - zmags.com - Add UA override for secure.viewer.zmags.com
-     * WebCompat issue #21576 - https://webcompat.com/issues/21576
-     *
-     * The zmags viewer locks out Fennec with a "Browser unsupported" message,
-     * but tests showed that it works just fine with a Chrome UA. Outreach
-     * attempts were unsuccessful, and as the site has a relatively high rank,
-     * we alter the UA.
-     */
-    id: "bug1509873",
-    platform: "android",
-    domain: "zmags.com",
-    bug: "1509873",
-    config: {
-      matches: ["*://*.viewer.zmags.com/*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.91 Mobile Safari/537.36"
-        );
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1566253 - posts.google.com - Add UA override for posts.google.com
-     * WebCompat issue #17870 - https://webcompat.com/issues/17870
-     *
-     * posts.google.com displaying "Your browser doesn't support this page".
-     * Spoofing as Chrome works fine.
-     */
-    id: "bug1566253",
-    platform: "android",
-    domain: "posts.google.com",
-    bug: "1566253",
-    config: {
-      matches: ["*://posts.google.com/*"],
-      uaTransformer: _ => {
-        return "Mozilla/5.0 (Linux; Android 6.0.1; SM-G900M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.101 Mobile Safari/537.36";
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1567945 - Create UA override for beeg.com on Firefox Android
-     * WebCompat issue #16648 - https://webcompat.com/issues/16648
-     *
-     * beeg.com is hiding content of a page with video if Firefox exists in UA,
-     * replacing "Firefox" with an empty string makes the page load
-     */
-    id: "bug1567945",
-    platform: "android",
-    domain: "beeg.com",
-    bug: "1567945",
-    config: {
-      matches: ["*://beeg.com/*"],
-      uaTransformer: originalUA => {
-        return originalUA.replace(/Firefox.+$/, "");
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1574522 - UA override for enuri.com on Firefox for Android
-     * WebCompat issue #37139 - https://webcompat.com/issues/37139
-     *
-     * enuri.com returns a different template for Firefox on Android
-     * based on server side UA detection. This results in page content cut offs.
-     * Spoofing as Chrome fixes the issue
-     */
-    id: "bug1574522",
-    platform: "android",
-    domain: "enuri.com",
-    bug: "1574522",
-    config: {
-      matches: ["*://enuri.com/*"],
-      uaTransformer: _ => {
-        return "Mozilla/5.0 (Linux; Android 6.0.1; SM-G900M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.111 Mobile Safari/537.36";
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1574564 - UA override for ceskatelevize.cz on Firefox for Android
-     * WebCompat issue #15467 - https://webcompat.com/issues/15467
-     *
-     * ceskatelevize sets streamingProtocol depending on the User-Agent it sees
-     * in the request headers, returning DASH for Chrome, HLS for iOS,
-     * and Flash for Fennec. Since Fennec has no Flash, the video doesn't work.
-     * Spoofing as Chrome makes the video play
-     */
-    id: "bug1574564",
-    platform: "android",
-    domain: "ceskatelevize.cz",
-    bug: "1574564",
-    config: {
-      matches: ["*://*.ceskatelevize.cz/*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.111 Mobile Safari/537.36"
-        );
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1577240 - UA override for heb.com on Firefox for Android
-     * WebCompat issue #33613 - https://webcompat.com/issues/33613
-     *
-     * heb.com shows desktop site on Firefox for Android for some pages based on
-     * UA detection. Spoofing as Chrome allows to get mobile site.
-     */
-    id: "bug1577240",
-    platform: "android",
-    domain: "heb.com",
-    bug: "1577240",
-    config: {
-      matches: ["*://*.heb.com/*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.111 Mobile Safari/537.36"
-        );
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1577250 - UA override for homebook.pl on Firefox for Android
-     * WebCompat issue #24044 - https://webcompat.com/issues/24044
-     *
-     * homebook.pl shows desktop site on Firefox for Android based on
-     * UA detection. Spoofing as Chrome allows to get mobile site.
-     */
-    id: "bug1577250",
-    platform: "android",
-    domain: "homebook.pl",
-    bug: "1577250",
-    config: {
-      matches: ["*://*.homebook.pl/*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.111 Mobile Safari/537.36"
-        );
-      },
-    },
-  },
-  {
-    /*
-     * Bug 1577267 - UA override for metfone.com.kh on Firefox for Android
-     * WebCompat issue #16363 - https://webcompat.com/issues/16363
-     *
-     * metfone.com.kh has a server side UA detection which returns desktop site
-     * for Firefox for Android. Spoofing as Chrome allows to receive mobile version
-     */
-    id: "bug1577267",
-    platform: "android",
-    domain: "metfone.com.kh",
-    bug: "1577267",
-    config: {
-      matches: ["*://*.metfone.com.kh/*"],
-      uaTransformer: originalUA => {
-        return (
-          UAHelpers.getPrefix(originalUA) +
-          " AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.111 Mobile Safari/537.36"
-        );
-      },
-    },
-  },
-];
-
-const UAHelpers = {
-  getDeviceAppropriateChromeUA() {
-    if (!UAHelpers._deviceAppropriateChromeUA) {
-      const userAgent =
-        typeof navigator !== "undefined" ? navigator.userAgent : "";
-      const RunningFirefoxVersion = (userAgent.match(/Firefox\/([0-9.]+)/) || [
-        "",
-        "58.0",
-      ])[1];
-      const RunningAndroidVersion =
-        userAgent.match(/Android\/[0-9.]+/) || "Android 6.0";
-      const ChromeVersionToMimic = "76.0.3809.111";
-      const ChromePhoneUA = `Mozilla/5.0 (Linux; ${RunningAndroidVersion}; Nexus 5 Build/MRA58N) FxQuantum/${RunningFirefoxVersion} AppleWebKit/537.36 (KHTML, like Gecko) Chrome/${ChromeVersionToMimic} Mobile Safari/537.36`;
-      const ChromeTabletUA = `Mozilla/5.0 (Linux; ${RunningAndroidVersion}; Nexus 7 Build/JSS15Q) FxQuantum/${RunningFirefoxVersion} AppleWebKit/537.36 (KHTML, like Gecko) Chrome/${ChromeVersionToMimic} Safari/537.36`;
-      const IsPhone = userAgent.includes("Mobile");
-      UAHelpers._deviceAppropriateChromeUA = IsPhone
-        ? ChromePhoneUA
-        : ChromeTabletUA;
-    }
-    return UAHelpers._deviceAppropriateChromeUA;
-  },
-  getPrefix(originalUA) {
-    return originalUA.substr(0, originalUA.indexOf(")") + 1);
-  },
-};
-
-module.exports = AVAILABLE_UA_OVERRIDES;
diff --git a/mobile/android/extensions/webcompat/experiment-apis/aboutConfigPrefs.js b/mobile/android/extensions/webcompat/experiment-apis/aboutConfigPrefs.js
deleted file mode 100644
index 102c8b9cf48e..000000000000
--- a/mobile/android/extensions/webcompat/experiment-apis/aboutConfigPrefs.js
+++ /dev/null
@@ -1,50 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* global ExtensionAPI, ExtensionCommon, Services, XPCOMUtils */
-
-XPCOMUtils.defineLazyModuleGetters(this, {
-  Services: "resource://gre/modules/Services.jsm",
-});
-
-this.aboutConfigPrefs = class extends ExtensionAPI {
-  getAPI(context) {
-    const EventManager = ExtensionCommon.EventManager;
-    const extensionIDBase = context.extension.id.split("@")[0];
-    const extensionPrefNameBase = `extensions.${extensionIDBase}.`;
-
-    return {
-      aboutConfigPrefs: {
-        onPrefChange: new EventManager({
-          context,
-          name: "aboutConfigPrefs.onUAOverridesPrefChange",
-          register: (fire, name) => {
-            const prefName = `${extensionPrefNameBase}${name}`;
-            const callback = () => {
-              fire.async(name).catch(() => {}); // ignore Message Manager disconnects
-            };
-            Services.prefs.addObserver(prefName, callback);
-            return () => {
-              Services.prefs.removeObserver(prefName, callback);
-            };
-          },
-        }).api(),
-        async getPref(name) {
-          try {
-            return Services.prefs.getBoolPref(
-              `${extensionPrefNameBase}${name}`
-            );
-          } catch (_) {
-            return undefined;
-          }
-        },
-        async setPref(name, value) {
-          Services.prefs.setBoolPref(`${extensionPrefNameBase}${name}`, value);
-        },
-      },
-    };
-  }
-};
diff --git a/mobile/android/extensions/webcompat/experiment-apis/aboutConfigPrefs.json b/mobile/android/extensions/webcompat/experiment-apis/aboutConfigPrefs.json
deleted file mode 100644
index c6105bb6392e..000000000000
--- a/mobile/android/extensions/webcompat/experiment-apis/aboutConfigPrefs.json
+++ /dev/null
@@ -1,53 +0,0 @@
-[
-  {
-    "namespace": "aboutConfigPrefs",
-    "description": "experimental API extension to allow access to about:config preferences",
-    "events": [
-      {
-        "name": "onPrefChange",
-        "type": "function",
-        "parameters": [{
-          "name": "name",
-          "type": "string",
-          "description": "The preference which changed"
-        }],
-        "extraParameters": [{
-          "name": "name",
-          "type": "string",
-          "description": "The preference to monitor"
-        }]
-      }
-    ],
-    "functions": [
-      {
-        "name": "getPref",
-        "type": "function",
-        "description": "Get a preference's value",
-        "parameters": [{
-          "name": "name",
-          "type": "string",
-          "description": "The preference name"
-        }],
-        "async": true
-      },
-      {
-        "name": "setPref",
-        "type": "function",
-        "description": "Set a preference's value",
-        "parameters": [
-          {
-            "name": "name",
-            "type": "string",
-            "description": "The preference name"
-          },
-          {
-            "name": "value",
-            "type": "boolean",
-            "description": "The new value"
-          }
-        ],
-        "async": true
-      }
-    ]
-  }
-]
diff --git a/mobile/android/extensions/webcompat/experiment-apis/experiments.js b/mobile/android/extensions/webcompat/experiment-apis/experiments.js
deleted file mode 100644
index d1ab77c31261..000000000000
--- a/mobile/android/extensions/webcompat/experiment-apis/experiments.js
+++ /dev/null
@@ -1,34 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* global ExtensionAPI, Services, XPCOMUtils */
-
-XPCOMUtils.defineLazyModuleGetters(this, {
-  EventDispatcher: "resource://gre/modules/Messaging.jsm",
-  Services: "resource://gre/modules/Services.jsm",
-});
-
-this.experiments = class extends ExtensionAPI {
-  getAPI(context) {
-    function promiseActiveExperiments() {
-      return EventDispatcher.instance.sendRequestForResult({
-        type: "Experiments:GetActive",
-      });
-    }
-    return {
-      experiments: {
-        async isActive(name) {
-          if (!Services.androidBridge || !Services.androidBridge.isFennec) {
-            return undefined;
-          }
-          return promiseActiveExperiments().then(experiments => {
-            return experiments.includes(name);
-          });
-        },
-      },
-    };
-  }
-};
diff --git a/mobile/android/extensions/webcompat/experiment-apis/experiments.json b/mobile/android/extensions/webcompat/experiment-apis/experiments.json
deleted file mode 100644
index 44f833215c2f..000000000000
--- a/mobile/android/extensions/webcompat/experiment-apis/experiments.json
+++ /dev/null
@@ -1,21 +0,0 @@
-[
-  {
-    "namespace": "experiments",
-    "description": "experimental API extension to allow checking the status of Fennec experiments via Switchboard",
-    "functions": [
-      {
-        "name": "isActive",
-        "type": "function",
-        "description": "Determine if a given experiment is active.",
-        "parameters": [
-          {
-            "name": "name",
-            "type": "string",
-            "description": "The experiment's name"
-          }
-        ],
-        "async": true
-      }
-    ]
-  }
-]
diff --git a/mobile/android/extensions/webcompat/experiment-apis/sharedPreferences.js b/mobile/android/extensions/webcompat/experiment-apis/sharedPreferences.js
deleted file mode 100644
index b2a19b3a6c70..000000000000
--- a/mobile/android/extensions/webcompat/experiment-apis/sharedPreferences.js
+++ /dev/null
@@ -1,33 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* global ExtensionAPI, Services, XPCOMUtils */
-
-XPCOMUtils.defineLazyModuleGetters(this, {
-  Services: "resource://gre/modules/Services.jsm",
-  SharedPreferences: "resource://gre/modules/SharedPreferences.jsm",
-});
-
-this.sharedPreferences = class extends ExtensionAPI {
-  getAPI(context) {
-    return {
-      sharedPreferences: {
-        async setCharPref(name, value) {
-          if (!Services.androidBridge || !Services.androidBridge.isFennec) {
-            return;
-          }
-          SharedPreferences.forApp().setCharPref(name, value);
-        },
-        async setBoolPref(name, value) {
-          if (!Services.androidBridge || !Services.androidBridge.isFennec) {
-            return;
-          }
-          SharedPreferences.forApp().setBoolPref(name, value);
-        },
-      },
-    };
-  }
-};
diff --git a/mobile/android/extensions/webcompat/experiment-apis/sharedPreferences.json b/mobile/android/extensions/webcompat/experiment-apis/sharedPreferences.json
deleted file mode 100644
index cf73414cf432..000000000000
--- a/mobile/android/extensions/webcompat/experiment-apis/sharedPreferences.json
+++ /dev/null
@@ -1,44 +0,0 @@
-[
-  {
-    "namespace": "sharedPreferences",
-    "description": "experimental API extension to allow setting SharedPreferences on Fennec",
-    "functions": [
-      {
-        "name": "setBoolPref",
-        "type": "function",
-        "description": "Set the value of a boolean Fennec SharedPreference",
-        "parameters": [
-          {
-            "name": "name",
-            "type": "string",
-            "description": "The key name"
-          },
-          {
-            "name": "value",
-            "type": "boolean",
-            "description": "The new value"
-          }
-        ],
-        "async": true
-      },
-      {
-        "name": "setCharPref",
-        "type": "function",
-        "description": "Set the value of a string Fennec SharedPreference",
-        "parameters": [
-          {
-            "name": "name",
-            "type": "string",
-            "description": "The key name"
-          },
-          {
-            "name": "value",
-            "type": "string",
-            "description": "The new value"
-          }
-        ],
-        "async": true
-      }
-    ]
-  }
-]
diff --git a/mobile/android/extensions/webcompat/injections/css/bug0000000-testbed-css-injection.css b/mobile/android/extensions/webcompat/injections/css/bug0000000-testbed-css-injection.css
deleted file mode 100644
index 1e82ee9722cc..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug0000000-testbed-css-injection.css
+++ /dev/null
@@ -1,3 +0,0 @@
-#css-injection.red {
-  background-color: #0f0;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1305028-gaming.youtube.com-webkit-scrollbar.css b/mobile/android/extensions/webcompat/injections/css/bug1305028-gaming.youtube.com-webkit-scrollbar.css
deleted file mode 100644
index f68accf26aef..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1305028-gaming.youtube.com-webkit-scrollbar.css
+++ /dev/null
@@ -1,14 +0,0 @@
-/**
- * gaming.youtube.com - The vertical scrollbar displayed for the main pane is
- * partially overlapped by the video itself
- * Bug #1305028 - https://bugzilla.mozilla.org/show_bug.cgi?id=1305028
- *
- * The scrollbar in the main player area is overlapped by the player, making the
- * design look broken. In Chrome, YouTube is using ::-webkit-scrollbar to style
- * the bar to match their expectations, but this doesn't work in Firefox.
- * To make it look less broken, we hide the scrollbar for the main video pane
- * entirely.
- */
-ytg-scroll-pane.ytg-watch-page {
-  scrollbar-width: none;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1432935-discordapp.com-webkit-scorllbar-white-line.css b/mobile/android/extensions/webcompat/injections/css/bug1432935-discordapp.com-webkit-scorllbar-white-line.css
deleted file mode 100644
index 283d79569b15..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1432935-discordapp.com-webkit-scorllbar-white-line.css
+++ /dev/null
@@ -1,16 +0,0 @@
-/**
- * discordapp.com - -webkit-scrollbar dependency causes visible white line
- * Part of Bug #1432935 - https://bugzilla.mozilla.org/show_bug.cgi?id=1432935
- * WebCompat issue #7919 - https://webcompat.com/issues/7919
- *
- * Discord depends on -webkit-scrollbar for styling and hiding their scrollbars
- * in the UI. Previously, the scrollbars overlapped content permanently.
- * However, this issue seems to be addressed now, but a small white line
- * still remains. While Discord is working on this, let's get rid of these
- * lines.
- */
-.themeGhostHairline-DBD-2d .pad-29zQak,
-.themeGhostHairlineChannels-3G0x9_ .pad-29zQak {
-  width: 3px !important;
-  left: -3px !important;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1518781-twitch.tv-webkit-scrollbar.css b/mobile/android/extensions/webcompat/injections/css/bug1518781-twitch.tv-webkit-scrollbar.css
deleted file mode 100644
index 13094e5bcd21..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1518781-twitch.tv-webkit-scrollbar.css
+++ /dev/null
@@ -1,14 +0,0 @@
-/**
- * twitch.tv - Comment interaction button is overlayed by scrollbar
- * Bug #1518781 - https://bugzilla.mozilla.org/show_bug.cgi?id=1518781
- *
- * The interaction buttons in Twitch' chat are partly overlayed by the
- * scrollbar, which makes them hard to use. Twitch uses
- * ::-webkit-scrollbar to make the scrollbar thinner, which isn't working in
- * Firefox.
- * Given that even scrollbar-width: thin; is not enough (see Bugzilla), let's
- * remove it entirely.
- */
-.video-chat__message-list-wrapper {
-  scrollbar-width: none;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1526977-sreedharscce.in-login-fix.css b/mobile/android/extensions/webcompat/injections/css/bug1526977-sreedharscce.in-login-fix.css
deleted file mode 100644
index b987ab584fdb..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1526977-sreedharscce.in-login-fix.css
+++ /dev/null
@@ -1,12 +0,0 @@
-/**
- * sreedharscce.in - Fix login form with CSS intervention
- * Bug #1526977 - https://bugzilla.mozilla.org/show_bug.cgi?id=1526977
- * WebCompat issue #21505 - https://webcompat.com/issues/21505
- *
- * The login form is partly moved out of the screen on sreedharscce.in in
- * Firefox. Enforcing the body height to the full viewport fixes this issue,
- * as the login form itself is posititoned with `position: absolute;`.
- */
-body {
-  height: 100vh;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1561371-mail.google.com-allow-horizontal-scrolling.css b/mobile/android/extensions/webcompat/injections/css/bug1561371-mail.google.com-allow-horizontal-scrolling.css
deleted file mode 100644
index 6d4aacdc3575..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1561371-mail.google.com-allow-horizontal-scrolling.css
+++ /dev/null
@@ -1,12 +0,0 @@
-/**
- * mail.google.com - The HTML email view does not allow horizontal scrolling
- * on Fennec due to a missing CSS rule which is only served to Chrome.
- * Bug #1561371 - https://bugzilla.mozilla.org/show_bug.cgi?id=1561371
- *
- * HTML emails may sometimes contain content that does not wrap, yet the
- * CSS served to Fennec does not permit scrolling horizontally. To prevent
- * this UX frustration, we enable horizontal scrolling.
- */
-body > #views {
-  overflow: auto;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1567610-dns.google.com-moz-fit-content.css b/mobile/android/extensions/webcompat/injections/css/bug1567610-dns.google.com-moz-fit-content.css
deleted file mode 100644
index 3ce62694e817..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1567610-dns.google.com-moz-fit-content.css
+++ /dev/null
@@ -1,12 +0,0 @@
-/**
- * dns.google.com - Page content is shifted to the left side of the page
- * Bug #1567610 - https://bugzilla.mozilla.org/show_bug.cgi?id=1567610
- * WebCompat issue #22494 - https://webcompat.com/issues/22494
- *
- * Affected element is styled with width:fit-content; which is not
- * supported by Firefox yet, see https://bugzilla.mozilla.org/show_bug.cgi?id=1495868
- * Adding -moz-fit-content fixes the issue
- */
-main > .ng-star-inserted > .centered {
-  width: -moz-fit-content;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1568256-zertifikate.commerzbank.de-flex.css b/mobile/android/extensions/webcompat/injections/css/bug1568256-zertifikate.commerzbank.de-flex.css
deleted file mode 100644
index 5ba83e76b81c..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1568256-zertifikate.commerzbank.de-flex.css
+++ /dev/null
@@ -1,12 +0,0 @@
-/**
- * zertifikate.commerzbank.de - clickable elements on the page are collapsed
- * Bug #1568256 - https://bugzilla.mozilla.org/show_bug.cgi?id=1568256
- * WebCompat issue #9102 - https://webcompat.com/issues/9102
- *
- * Affected elements have display:-webkit-box and display:flex applied, however,
- * listed in wrong order, so display:-webkit-box is becoming the final say.
- * Adding display: flex for those elements fixes the issue
- */
-.x-layout-box {
-  display: flex !important;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1568908-console.cloud.google.com-scrollbar-fix.css b/mobile/android/extensions/webcompat/injections/css/bug1568908-console.cloud.google.com-scrollbar-fix.css
deleted file mode 100644
index 89536c69de9c..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1568908-console.cloud.google.com-scrollbar-fix.css
+++ /dev/null
@@ -1,16 +0,0 @@
-/**
- * console.cloud.google.com - Double scrollbar visisible on long pages
- * Bug #1568908 - https://bugzilla.mozilla.org/show_bug.cgi?id=1568908
- * WebCompat issue #33164 - https://webcompat.com/issues/33164
- *
- * For pages that have contents heigher than the page's height, a secondary
- * scrollbar outside the scrollable content area is visible. This is caused
- * by a difference in Flexbox behavior, which is being addressed in
- * https://bugs.chromium.org/p/chromium/issues/detail?id=981134
- *
- * Until this fix hits release and Google has updated their UI properly,
- * this intervention addresses the differences.
- */
-central-page-area {
-  min-height: 0;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1570119-teamcoco.com-scrollbar-width.css b/mobile/android/extensions/webcompat/injections/css/bug1570119-teamcoco.com-scrollbar-width.css
deleted file mode 100644
index 7a6c2c07c265..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1570119-teamcoco.com-scrollbar-width.css
+++ /dev/null
@@ -1,11 +0,0 @@
-/**
- * teamcoco.com - a scrollbar at the top covering navigation menu
- * Bug #1570119 - https://bugzilla.mozilla.org/show_bug.cgi?id=1570119
- *
- * The scrollbar is covering navigation items making them unusable.
- * There are ::-webkit-scrollbar css rules already applied to the scrollbar,
- * hiding it in Chrome. Adding the scrollbar-width: none fixes the issue in Firefox.
- */
-.css-bdnz85 {
-  scrollbar-width: none;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1570328-developer-apple.com-transform-scale.css b/mobile/android/extensions/webcompat/injections/css/bug1570328-developer-apple.com-transform-scale.css
deleted file mode 100644
index 2ffd45a3611d..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1570328-developer-apple.com-transform-scale.css
+++ /dev/null
@@ -1,17 +0,0 @@
-/**
- * developer.apple.com - content of the page is shifted to the left
- * Bug #1570328 - https://bugzilla.mozilla.org/show_bug.cgi?id=1570328
- * WebCompat issue #4070 - https://webcompat.com/issues/4070
- *
- * The site is relying on zoom property which is not supported by Mozilla,
- * see https://bugzilla.mozilla.org/show_bug.cgi?id=390936. Adding a combination
- * of transform: scale(1.4), transform-origin and width fixes the issue
- */
-@media only screen and (min-device-width: 320px) and (max-device-width: 980px),
-  (min-device-width: 1024px) and (max-device-width: 1024px) and (min-device-height: 1366px) and (max-device-height: 1366px) and (min-width: 320px) and (max-width: 980px) {
-  #tocContainer {
-    transform-origin: 0 0;
-    transform: scale(1.4);
-    width: 71.4%;
-  }
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1574973-patch.com-dropdown-menu-fix.css b/mobile/android/extensions/webcompat/injections/css/bug1574973-patch.com-dropdown-menu-fix.css
deleted file mode 100644
index 37493c30f207..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1574973-patch.com-dropdown-menu-fix.css
+++ /dev/null
@@ -1,13 +0,0 @@
-/**
- * patch.com - sub-menu expands at the bottom of the page and overlaps other elements.
- * Bug #1574973 - https://bugzilla.mozilla.org/show_bug.cgi?id=1574973
- * WebCompat issue #25384 - https://webcompat.com/issues/25384
- *
- * patch.con has a top:100% style on the relatively-positioned element
- * with class="dropdown-menu", and Firefox is incorrectly honoring that
- * style (resolving it to something nonzero), whereas Chrome just treats it as "auto"
- * see https://bugzilla.mozilla.org/show_bug.cgi?id=1092007
- */
-#patch-nav-secondary .dropdown-menu {
-  top: auto;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1575000-apply.lloydsbank.co.uk-radio-buttons-fix.css b/mobile/android/extensions/webcompat/injections/css/bug1575000-apply.lloydsbank.co.uk-radio-buttons-fix.css
deleted file mode 100644
index d6c7e82e2639..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1575000-apply.lloydsbank.co.uk-radio-buttons-fix.css
+++ /dev/null
@@ -1,11 +0,0 @@
-/**
- * apply.lloydsbank.co.uk - radio buttons are misplaced
- * Bug #1575000 - https://bugzilla.mozilla.org/show_bug.cgi?id=1575000
- * WebCompat issue #34969 - https://webcompat.com/issues/34969
- *
- * Radio buttons are displaced to the left due to positioning issue of ::before
- * pseudo element, adding position relative to it's parent fixes the issue.
- */
-.radio-content-field .radio.inline label span.text {
-  position: relative;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1575011-holiday-weather.com-scrolling-fix.css b/mobile/android/extensions/webcompat/injections/css/bug1575011-holiday-weather.com-scrolling-fix.css
deleted file mode 100644
index 3d5461da171d..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1575011-holiday-weather.com-scrolling-fix.css
+++ /dev/null
@@ -1,15 +0,0 @@
-/**
- * holiday-weather.com - page is not scrollable
- * Bug #1575011 - https://bugzilla.mozilla.org/show_bug.cgi?id=1575011
- * WebCompat issue #18478 - https://webcompat.com/issues/18478
- *
- * the page won't scroll since the flex container is too high,
- * adding min height to parent containers fixes the issue
- */
-.page-container-style__pageContent {
-  min-height: 0;
-}
-
-.widgets-style__root {
-  min-height: 0;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1575017-dunkindonuts.com-flex-basis.css b/mobile/android/extensions/webcompat/injections/css/bug1575017-dunkindonuts.com-flex-basis.css
deleted file mode 100644
index ad224c85e7a0..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1575017-dunkindonuts.com-flex-basis.css
+++ /dev/null
@@ -1,11 +0,0 @@
-/**
- * dunkindonuts.com - form input fields are small and misaligned
- * Bug #1575017 - https://bugzilla.mozilla.org/show_bug.cgi?id=1575017
- * WebCompat issue #28742 - https://webcompat.com/issues/28742
- *
- * Form input fields are small and misaligned due to flex-basis: min-content;
- * applied on their parent element. Setting it to auto fixes the issue
- */
-.grid__item {
-  flex-basis: auto;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1577270-binance.com-calc-height-fix.css b/mobile/android/extensions/webcompat/injections/css/bug1577270-binance.com-calc-height-fix.css
deleted file mode 100644
index 59d70ace987f..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1577270-binance.com-calc-height-fix.css
+++ /dev/null
@@ -1,12 +0,0 @@
-/**
- * binance.com - can't see the full site
- * Bug #1577270 - https://bugzilla.mozilla.org/show_bug.cgi?id=1577270
- * WebCompat issue #17810 - https://webcompat.com/issues/17810
- *
- * The site does not have a doctype and is rendered in quirks mode. The calc() percentage
- * height is applied on the .main-page .viewWrap element, but its parent does not have
- * a specified height property. Adding a height of 100% to the parent fixes the issue.
- */
-#tradeDiv {
-  height: 100%;
-}
diff --git a/mobile/android/extensions/webcompat/injections/css/bug1577297-kitkat.com.au-slider-width-fix.css b/mobile/android/extensions/webcompat/injections/css/bug1577297-kitkat.com.au-slider-width-fix.css
deleted file mode 100644
index 66097799c0f5..000000000000
--- a/mobile/android/extensions/webcompat/injections/css/bug1577297-kitkat.com.au-slider-width-fix.css
+++ /dev/null
@@ -1,11 +0,0 @@
-/**
- * kitkat.com.au - can't see the content
- * Bug #1577297 - https://bugzilla.mozilla.org/show_bug.cgi?id=1577297
- * WebCompat issue #28992 - https://webcompat.com/issues/28992
- *
- * Affected element is too wide due to https://bugzilla.mozilla.org/show_bug.cgi?id=1316534.
- * Adding min-width: 0; fixes the issue
- */
-.columns .column.main {
-  min-width: 0;
-}
diff --git a/mobile/android/extensions/webcompat/injections/js/bug0000000-testbed-js-injection.js b/mobile/android/extensions/webcompat/injections/js/bug0000000-testbed-js-injection.js
deleted file mode 100644
index 4e7db8c5f918..000000000000
--- a/mobile/android/extensions/webcompat/injections/js/bug0000000-testbed-js-injection.js
+++ /dev/null
@@ -1,11 +0,0 @@
-"use strict";
-
-/* globals exportFunction */
-
-Object.defineProperty(window.wrappedJSObject, "isTestFeatureSupported", {
-  get: exportFunction(function() {
-    return true;
-  }, window),
-
-  set: exportFunction(function() {}, window),
-});
diff --git a/mobile/android/extensions/webcompat/injections/js/bug1452707-window.controllers-shim-ib.absa.co.za.js b/mobile/android/extensions/webcompat/injections/js/bug1452707-window.controllers-shim-ib.absa.co.za.js
deleted file mode 100644
index d04dcd763886..000000000000
--- a/mobile/android/extensions/webcompat/injections/js/bug1452707-window.controllers-shim-ib.absa.co.za.js
+++ /dev/null
@@ -1,29 +0,0 @@
-"use strict";
-
-/**
- * Bug 1452707 - Build site patch for ib.absa.co.za
- * WebCompat issue #16401 - https://webcompat.com/issues/16401
- *
- * The online banking at ib.absa.co.za detect if window.controllers is a
- * non-falsy value to detect if the current browser is Firefox or something
- * else. In bug 1448045, this shim has been disabled for Firefox Nightly 61+,
- * which breaks the UA detection on this site and results in a "Browser
- * unsuppored" error message.
- *
- * This site patch simply sets window.controllers to a string, resulting in
- * their check to work again.
- */
-
-/* globals exportFunction */
-
-console.info(
-  "window.controllers has been shimmed for compatibility reasons. See https://webcompat.com/issues/16401 for details."
-);
-
-Object.defineProperty(window.wrappedJSObject, "controllers", {
-  get: exportFunction(function() {
-    return true;
-  }, window),
-
-  set: exportFunction(function() {}, window),
-});
diff --git a/mobile/android/extensions/webcompat/injections/js/bug1457335-histography.io-ua-change.js b/mobile/android/extensions/webcompat/injections/js/bug1457335-histography.io-ua-change.js
deleted file mode 100644
index 8bbab329c475..000000000000
--- a/mobile/android/extensions/webcompat/injections/js/bug1457335-histography.io-ua-change.js
+++ /dev/null
@@ -1,34 +0,0 @@
-"use strict";
-
-/**
- * Bug 1457335 - histography.io - Override UA & navigator.vendor
- * WebCompat issue #1804 - https://webcompat.com/issues/1804
- *
- * This site is using a strict matching of navigator.userAgent and
- * navigator.vendor to allow access for Safari or Chrome. Here, we set the
- * values appropriately so we get recognized as Chrome.
- */
-
-/* globals exportFunction */
-
-console.info(
-  "The user agent has been overridden for compatibility reasons. See https://webcompat.com/issues/1804 for details."
-);
-
-const CHROME_UA = navigator.userAgent + " Chrome for WebCompat";
-
-Object.defineProperty(window.navigator.wrappedJSObject, "userAgent", {
-  get: exportFunction(function() {
-    return CHROME_UA;
-  }, window),
-
-  set: exportFunction(function() {}, window),
-});
-
-Object.defineProperty(window.navigator.wrappedJSObject, "vendor", {
-  get: exportFunction(function() {
-    return "Google Inc.";
-  }, window),
-
-  set: exportFunction(function() {}, window),
-});
diff --git a/mobile/android/extensions/webcompat/injections/js/bug1472075-bankofamerica.com-ua-change.js b/mobile/android/extensions/webcompat/injections/js/bug1472075-bankofamerica.com-ua-change.js
deleted file mode 100644
index 0f6142249481..000000000000
--- a/mobile/android/extensions/webcompat/injections/js/bug1472075-bankofamerica.com-ua-change.js
+++ /dev/null
@@ -1,48 +0,0 @@
-"use strict";
-
-/**
- * Bug 1472075 - Build UA override for Bank of America for OSX & Linux
- * WebCompat issue #2787 - https://webcompat.com/issues/2787
- *
- * BoA is showing a red warning to Linux and macOS users, while accepting
- * Windows users without warning. From our side, there is no difference here
- * and we receive a lot of user complains about the warnings, so we spoof
- * as Firefox on Windows in those cases.
- */
-
-/* globals exportFunction */
-
-if (!navigator.platform.includes("Win")) {
-  console.info(
-    "The user agent has been overridden for compatibility reasons. See https://webcompat.com/issues/2787 for details."
-  );
-
-  const WINDOWS_UA = navigator.userAgent.replace(
-    /\(.*; rv:/i,
-    "(Windows NT 10.0; Win64; x64; rv:"
-  );
-
-  Object.defineProperty(window.navigator.wrappedJSObject, "userAgent", {
-    get: exportFunction(function() {
-      return WINDOWS_UA;
-    }, window),
-
-    set: exportFunction(function() {}, window),
-  });
-
-  Object.defineProperty(window.navigator.wrappedJSObject, "appVersion", {
-    get: exportFunction(function() {
-      return "appVersion";
-    }, window),
-
-    set: exportFunction(function() {}, window),
-  });
-
-  Object.defineProperty(window.navigator.wrappedJSObject, "platform", {
-    get: exportFunction(function() {
-      return "Win64";
-    }, window),
-
-    set: exportFunction(function() {}, window),
-  });
-}
diff --git a/mobile/android/extensions/webcompat/injections/js/bug1472081-election.gov.np-window.sidebar-shim.js b/mobile/android/extensions/webcompat/injections/js/bug1472081-election.gov.np-window.sidebar-shim.js
deleted file mode 100644
index df9520c5e5c6..000000000000
--- a/mobile/android/extensions/webcompat/injections/js/bug1472081-election.gov.np-window.sidebar-shim.js
+++ /dev/null
@@ -1,25 +0,0 @@
-"use strict";
-
-/**
- * Bug 1472081 - election.gov.np - Override window.sidebar with something falsey
- * WebCompat issue #11622 - https://webcompat.com/issues/11622
- *
- * This site is blocking onmousedown and onclick if window.sidebar is something
- * that evaluates to true, rendering the form fields unusable. This patch
- * overrides window.sidebar with false, so the blocking event handlers won't
- * get registered.
- */
-
-/* globals exportFunction */
-
-console.info(
-  "window.sidebar has been shimmed for compatibility reasons. See https://webcompat.com/issues/11622 for details."
-);
-
-Object.defineProperty(window.wrappedJSObject, "sidebar", {
-  get: exportFunction(function() {
-    return false;
-  }, window),
-
-  set: exportFunction(function() {}, window),
-});
diff --git a/mobile/android/extensions/webcompat/injections/js/bug1482066-portalminasnet.com-window.sidebar-shim.js b/mobile/android/extensions/webcompat/injections/js/bug1482066-portalminasnet.com-window.sidebar-shim.js
deleted file mode 100644
index d70287f3403b..000000000000
--- a/mobile/android/extensions/webcompat/injections/js/bug1482066-portalminasnet.com-window.sidebar-shim.js
+++ /dev/null
@@ -1,25 +0,0 @@
-"use strict";
-
-/**
- * portalminasnet.com - Override window.sidebar with something falsey
- * WebCompat issue #18143 - https://webcompat.com/issues/18143
- *
- * This site is blocking onmousedown and onclick if window.sidebar is something
- * that evaluates to true, rendering the login unusable. This patch overrides
- * window.sidebar with false, so the blocking event handlers won't get
- * registered.
- */
-
-/* globals exportFunction */
-
-console.info(
-  "window.sidebar has been shimmed for compatibility reasons. See https://webcompat.com/issues/18143 for details."
-);
-
-Object.defineProperty(window.wrappedJSObject, "sidebar", {
-  get: exportFunction(function() {
-    return false;
-  }, window),
-
-  set: exportFunction(function() {}, window),
-});
diff --git a/mobile/android/extensions/webcompat/injections/js/bug1570856-medium.com-menu-isTier1.js b/mobile/android/extensions/webcompat/injections/js/bug1570856-medium.com-menu-isTier1.js
deleted file mode 100644
index f8bb926b60d0..000000000000
--- a/mobile/android/extensions/webcompat/injections/js/bug1570856-medium.com-menu-isTier1.js
+++ /dev/null
@@ -1,34 +0,0 @@
-"use strict";
-
-/**
- * medium.com - Override window.GLOBALS.useragent.isTier1 to be true
- * WebCompat issue #25844 - https://webcompat.com/issues/25844
- *
- * This site is not showing main menu when scrolling. There is a GLOBALS variable
- * at the bottom of the template being defined based on a server side UA detection.
- * Setting window.GLOBALS.useragent.isTier1 to true makes the menu appear when scrolling
- */
-
-/* globals exportFunction */
-
-console.info(
-  "window.GLOBALS.useragent.isTier1 has been set to true for compatibility reasons. See https://webcompat.com/issues/25844 for details."
-);
-
-let globals = {};
-
-Object.defineProperty(window.wrappedJSObject, "GLOBALS", {
-  get: exportFunction(function() {
-    return globals;
-  }, window),
-
-  set: exportFunction(function(value = {}) {
-    globals = value;
-
-    if (!globals.useragent) {
-      globals.useragent = {};
-    }
-
-    globals.useragent.isTier1 = true;
-  }, window),
-});
diff --git a/mobile/android/extensions/webcompat/injections/js/bug1577245-salesforce-communities-hide-unsupported.js b/mobile/android/extensions/webcompat/injections/js/bug1577245-salesforce-communities-hide-unsupported.js
deleted file mode 100644
index ca9507bc2d9e..000000000000
--- a/mobile/android/extensions/webcompat/injections/js/bug1577245-salesforce-communities-hide-unsupported.js
+++ /dev/null
@@ -1,49 +0,0 @@
-"use strict";
-
-/**
- * help.pandora.com - Hide unsupported message in Firefox for Android
- * WebCompat issue #38433 - https://webcompat.com/issues/38433
- *
- * SalesForce Communities are showing unsupported message
- * for help.pandora.com and some more sites. See the full list here:
- * https://github.com/webcompat/web-bugs/issues?utf8=%E2%9C%93&q=doNotShowUnsupportedBrowserModal
- */
-
-console.info(
-  "Unsupported message has been hidden for compatibility reasons. See https://webcompat.com/issues/38433 for details."
-);
-
-const NOTIFICATIONS_LIMIT = 20;
-
-const createObserver = callback => {
-  return new MutationObserver(callback).observe(document, {
-    childList: true,
-    subtree: true,
-  });
-};
-
-const removeElementWhenReady = elementId => {
-  const element = document.getElementById(elementId);
-  if (element) {
-    element.remove();
-    return;
-  }
-
-  let n = 0;
-  createObserver(function(records, observer) {
-    const _element = document.getElementById(elementId);
-    if (_element) {
-      _element.remove();
-      observer.disconnect();
-      return;
-    }
-
-    if (n > NOTIFICATIONS_LIMIT) {
-      observer.disconnect();
-    }
-
-    n++;
-  });
-};
-
-removeElementWhenReady("community-browser-not-support-message");
diff --git a/mobile/android/extensions/webcompat/injections/js/bug1579159-m.tailieu.vn-pdfjs-worker-disable.js b/mobile/android/extensions/webcompat/injections/js/bug1579159-m.tailieu.vn-pdfjs-worker-disable.js
deleted file mode 100644
index b6600e93f8a3..000000000000
--- a/mobile/android/extensions/webcompat/injections/js/bug1579159-m.tailieu.vn-pdfjs-worker-disable.js
+++ /dev/null
@@ -1,28 +0,0 @@
-"use strict";
-
-/**
- * m.tailieu.vn - Override PDFJS.disableWorker to be true
- * WebCompat issue #39057 - https://webcompat.com/issues/39057
- *
- * Custom viewer built with PDF.js is not working in Firefox for Android
- * Disabling worker to match Chrome behavior fixes the issue
- */
-
-/* globals exportFunction */
-
-console.info(
-  "window.PDFJS.disableWorker has been set to true for compatibility reasons. See https://webcompat.com/issues/39057 for details."
-);
-
-let globals = {};
-
-Object.defineProperty(window.wrappedJSObject, "PDFJS", {
-  get: exportFunction(function() {
-    return globals;
-  }, window),
-
-  set: exportFunction(function(value = {}) {
-    globals = value;
-    globals.disableWorker = true;
-  }, window),
-});
diff --git a/mobile/android/extensions/webcompat/lib/about_compat_broker.js b/mobile/android/extensions/webcompat/lib/about_compat_broker.js
deleted file mode 100644
index f525a3f0df5b..000000000000
--- a/mobile/android/extensions/webcompat/lib/about_compat_broker.js
+++ /dev/null
@@ -1,123 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* global browser, module */
-
-class AboutCompatBroker {
-  constructor(bindings) {
-    this.portsToAboutCompatTabs = this.buildPorts();
-
-    this._injections = bindings.injections;
-    this._injections.bindAboutCompatBroker(this);
-
-    this._uaOverrides = bindings.uaOverrides;
-    this._uaOverrides.bindAboutCompatBroker(this);
-  }
-
-  buildPorts() {
-    const ports = new Set();
-
-    browser.runtime.onConnect.addListener(port => {
-      ports.add(port);
-      port.onDisconnect.addListener(function() {
-        ports.delete(port);
-      });
-    });
-
-    async function broadcast(message) {
-      for (const port of ports) {
-        port.postMessage(message);
-      }
-    }
-
-    return { broadcast };
-  }
-
-  filterOverrides(overrides) {
-    return overrides
-      .filter(override => override.availableOnPlatform)
-      .map(override => {
-        const { id, active, bug, domain, hidden } = override;
-        return { id, active, bug, domain, hidden };
-      });
-  }
-
-  getOverrideOrInterventionById(id) {
-    for (const [type, things] of Object.entries({
-      overrides: this._uaOverrides.getAvailableOverrides(),
-      interventions: this._injections.getAvailableInjections(),
-    })) {
-      for (const what of things) {
-        if (what.id === id) {
-          return { type, what };
-        }
-      }
-    }
-    return {};
-  }
-
-  bootup() {
-    browser.runtime.onMessage.addListener(msg => {
-      switch (msg.command || msg) {
-        case "toggle": {
-          const id = msg.id;
-          const { type, what } = this.getOverrideOrInterventionById(id);
-          if (!what) {
-            return Promise.reject(
-              `No such override or intervention to toggle: ${id}`
-            );
-          }
-          this.portsToAboutCompatTabs
-            .broadcast({ toggling: id, active: what.active })
-            .then(async () => {
-              switch (type) {
-                case "interventions": {
-                  if (what.active) {
-                    await this._injections.disableInjection(what);
-                  } else {
-                    await this._injections.enableInjection(what);
-                  }
-                  break;
-                }
-                case "overrides": {
-                  if (what.active) {
-                    await this._uaOverrides.disableOverride(what);
-                  } else {
-                    await this._uaOverrides.enableOverride(what);
-                  }
-                  break;
-                }
-              }
-              this.portsToAboutCompatTabs.broadcast({
-                toggled: id,
-                active: what.active,
-              });
-            });
-          break;
-        }
-        case "getOverridesAndInterventions": {
-          return Promise.resolve({
-            overrides:
-              (this._uaOverrides.isEnabled() &&
-                this.filterOverrides(
-                  this._uaOverrides.getAvailableOverrides()
-                )) ||
-              false,
-            interventions:
-              (this._injections.isEnabled() &&
-                this.filterOverrides(
-                  this._injections.getAvailableInjections()
-                )) ||
-              false,
-          });
-        }
-      }
-      return undefined;
-    });
-  }
-}
-
-module.exports = AboutCompatBroker;
diff --git a/mobile/android/extensions/webcompat/lib/custom_functions.js b/mobile/android/extensions/webcompat/lib/custom_functions.js
deleted file mode 100644
index a84cd0c6e162..000000000000
--- a/mobile/android/extensions/webcompat/lib/custom_functions.js
+++ /dev/null
@@ -1,77 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* globals browser, module */
-
-const replaceStringInRequest = (
-  requestId,
-  inString,
-  outString,
-  inEncoding = "utf-8"
-) => {
-  const filter = browser.webRequest.filterResponseData(requestId);
-  const decoder = new TextDecoder(inEncoding);
-  const encoder = new TextEncoder();
-  const RE = new RegExp(inString, "g");
-  const carryoverLength = inString.length;
-  let carryover = "";
-
-  filter.ondata = event => {
-    const replaced = (
-      carryover + decoder.decode(event.data, { stream: true })
-    ).replace(RE, outString);
-    filter.write(encoder.encode(replaced.slice(0, -carryoverLength)));
-    carryover = replaced.slice(-carryoverLength);
-  };
-
-  filter.onstop = event => {
-    if (carryover.length) {
-      filter.write(encoder.encode(carryover));
-    }
-    filter.close();
-  };
-};
-
-const CUSTOM_FUNCTIONS = {
-  noSniffFix: injection => {
-    const { urls, contentType } = injection.data;
-    const listener = (injection.data.listener = e => {
-      e.responseHeaders.push(contentType);
-      return { responseHeaders: e.responseHeaders };
-    });
-
-    browser.webRequest.onHeadersReceived.addListener(listener, { urls }, [
-      "blocking",
-      "responseHeaders",
-    ]);
-  },
-  noSniffFixDisable: injection => {
-    const { listener } = injection.data;
-    browser.webRequest.onHeadersReceived.removeListener(listener);
-    delete injection.data.listener;
-  },
-  pdk5fix: injection => {
-    const { urls, types } = injection.data;
-    const listener = (injection.data.listener = ({ requestId }) => {
-      replaceStringInRequest(
-        requestId,
-        "VideoContextChromeAndroid",
-        "VideoContextAndroid"
-      );
-      return {};
-    });
-    browser.webRequest.onBeforeRequest.addListener(listener, { urls, types }, [
-      "blocking",
-    ]);
-  },
-  pdk5fixDisable: injection => {
-    const { listener } = injection.data;
-    browser.webRequest.onBeforeRequest.removeListener(listener);
-    delete injection.data.listener;
-  },
-};
-
-module.exports = CUSTOM_FUNCTIONS;
diff --git a/mobile/android/extensions/webcompat/lib/google.js b/mobile/android/extensions/webcompat/lib/google.js
deleted file mode 100644
index 22c5ba9c67be..000000000000
--- a/mobile/android/extensions/webcompat/lib/google.js
+++ /dev/null
@@ -1,215 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* globals module */
-
-const GOOGLE_TLDS = [
-  "com",
-  "ac",
-  "ad",
-  "ae",
-  "com.af",
-  "com.ag",
-  "com.ai",
-  "al",
-  "am",
-  "co.ao",
-  "com.ar",
-  "as",
-  "at",
-  "com.au",
-  "az",
-  "ba",
-  "com.bd",
-  "be",
-  "bf",
-  "bg",
-  "com.bh",
-  "bi",
-  "bj",
-  "com.bn",
-  "com.bo",
-  "com.br",
-  "bs",
-  "bt",
-  "co.bw",
-  "by",
-  "com.bz",
-  "ca",
-  "com.kh",
-  "cc",
-  "cd",
-  "cf",
-  "cat",
-  "cg",
-  "ch",
-  "ci",
-  "co.ck",
-  "cl",
-  "cm",
-  "cn",
-  "com.co",
-  "co.cr",
-  "com.cu",
-  "cv",
-  "com.cy",
-  "cz",
-  "de",
-  "dj",
-  "dk",
-  "dm",
-  "com.do",
-  "dz",
-  "com.ec",
-  "ee",
-  "com.eg",
-  "es",
-  "com.et",
-  "fi",
-  "com.fj",
-  "fm",
-  "fr",
-  "ga",
-  "ge",
-  "gf",
-  "gg",
-  "com.gh",
-  "com.gi",
-  "gl",
-  "gm",
-  "gp",
-  "gr",
-  "com.gt",
-  "gy",
-  "com.hk",
-  "hn",
-  "hr",
-  "ht",
-  "hu",
-  "co.id",
-  "iq",
-  "ie",
-  "co.il",
-  "im",
-  "co.in",
-  "io",
-  "is",
-  "it",
-  "je",
-  "com.jm",
-  "jo",
-  "co.jp",
-  "co.ke",
-  "ki",
-  "kg",
-  "co.kr",
-  "com.kw",
-  "kz",
-  "la",
-  "com.lb",
-  "com.lc",
-  "li",
-  "lk",
-  "co.ls",
-  "lt",
-  "lu",
-  "lv",
-  "com.ly",
-  "co.ma",
-  "md",
-  "me",
-  "mg",
-  "mk",
-  "ml",
-  "com.mm",
-  "mn",
-  "ms",
-  "com.mt",
-  "mu",
-  "mv",
-  "mw",
-  "com.mx",
-  "com.my",
-  "co.mz",
-  "com.na",
-  "ne",
-  "com.nf",
-  "com.ng",
-  "com.ni",
-  "nl",
-  "no",
-  "com.np",
-  "nr",
-  "nu",
-  "co.nz",
-  "com.om",
-  "com.pk",
-  "com.pa",
-  "com.pe",
-  "com.ph",
-  "pl",
-  "com.pg",
-  "pn",
-  "com.pr",
-  "ps",
-  "pt",
-  "com.py",
-  "com.qa",
-  "ro",
-  "rs",
-  "ru",
-  "rw",
-  "com.sa",
-  "com.sb",
-  "sc",
-  "se",
-  "com.sg",
-  "sh",
-  "si",
-  "sk",
-  "com.sl",
-  "sn",
-  "sm",
-  "so",
-  "st",
-  "sr",
-  "com.sv",
-  "td",
-  "tg",
-  "co.th",
-  "com.tj",
-  "tk",
-  "tl",
-  "tm",
-  "to",
-  "tn",
-  "com.tr",
-  "tt",
-  "com.tw",
-  "co.tz",
-  "com.ua",
-  "co.ug",
-  "co.uk",
-  "com",
-  "com.uy",
-  "co.uz",
-  "com.vc",
-  "co.ve",
-  "vg",
-  "co.vi",
-  "com.vn",
-  "vu",
-  "ws",
-  "co.za",
-  "co.zm",
-  "co.zw",
-];
-
-function getMatchPatternsForGoogleURL(url, path = "*") {
-  return GOOGLE_TLDS.map(domain => `*://${url}.${domain}/${path}`);
-}
-
-module.exports = getMatchPatternsForGoogleURL;
diff --git a/mobile/android/extensions/webcompat/lib/injections.js b/mobile/android/extensions/webcompat/lib/injections.js
deleted file mode 100644
index 15170ad53010..000000000000
--- a/mobile/android/extensions/webcompat/lib/injections.js
+++ /dev/null
@@ -1,165 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* globals browser, module */
-
-class Injections {
-  constructor(availableInjections, customFunctions) {
-    this.INJECTION_PREF = "perform_injections";
-
-    this._injectionsEnabled = true;
-
-    this._availableInjections = availableInjections;
-    this._activeInjections = new Map();
-    this._customFunctions = customFunctions;
-  }
-
-  bindAboutCompatBroker(broker) {
-    this._aboutCompatBroker = broker;
-  }
-
-  bootup() {
-    browser.aboutConfigPrefs.onPrefChange.addListener(() => {
-      this.checkInjectionPref();
-    }, this.INJECTION_PREF);
-    this.checkInjectionPref();
-  }
-
-  checkInjectionPref() {
-    browser.aboutConfigPrefs.getPref(this.INJECTION_PREF).then(value => {
-      if (value === undefined) {
-        browser.aboutConfigPrefs.setPref(this.INJECTION_PREF, true);
-      } else if (value === false) {
-        this.unregisterContentScripts();
-      } else {
-        this.registerContentScripts();
-      }
-    });
-  }
-
-  getAvailableInjections() {
-    return this._availableInjections;
-  }
-
-  isEnabled() {
-    return this._injectionsEnabled;
-  }
-
-  async registerContentScripts() {
-    const platformMatches = ["all"];
-    let platformInfo = await browser.runtime.getPlatformInfo();
-    platformMatches.push(platformInfo.os == "android" ? "android" : "desktop");
-
-    for (const injection of this._availableInjections) {
-      if (platformMatches.includes(injection.platform)) {
-        injection.availableOnPlatform = true;
-        await this.enableInjection(injection);
-      }
-    }
-
-    this._injectionsEnabled = true;
-    this._aboutCompatBroker.portsToAboutCompatTabs.broadcast({
-      interventionsChanged: this._aboutCompatBroker.filterOverrides(
-        this._availableInjections
-      ),
-    });
-  }
-
-  assignContentScriptDefaults(contentScripts) {
-    let finalConfig = Object.assign({}, contentScripts);
-
-    if (!finalConfig.runAt) {
-      finalConfig.runAt = "document_start";
-    }
-
-    return finalConfig;
-  }
-
-  async enableInjection(injection) {
-    if (injection.active) {
-      return undefined;
-    }
-
-    if (injection.customFunc) {
-      return this.enableCustomInjection(injection);
-    }
-
-    return this.enableContentScripts(injection);
-  }
-
-  enableCustomInjection(injection) {
-    if (injection.customFunc in this._customFunctions) {
-      this._customFunctions[injection.customFunc](injection);
-      injection.active = true;
-    } else {
-      console.error(
-        `Provided function ${
-          injection.customFunc
-        } wasn't found in functions list`
-      );
-    }
-  }
-
-  async enableContentScripts(injection) {
-    try {
-      const handle = await browser.contentScripts.register(
-        this.assignContentScriptDefaults(injection.contentScripts)
-      );
-      this._activeInjections.set(injection, handle);
-      injection.active = true;
-    } catch (ex) {
-      console.error(
-        "Registering WebCompat GoFaster content scripts failed: ",
-        ex
-      );
-    }
-  }
-
-  unregisterContentScripts() {
-    for (const injection of this._availableInjections) {
-      this.disableInjection(injection);
-    }
-
-    this._injectionsEnabled = false;
-    this._aboutCompatBroker.portsToAboutCompatTabs.broadcast({
-      interventionsChanged: false,
-    });
-  }
-
-  async disableInjection(injection) {
-    if (!injection.active) {
-      return undefined;
-    }
-
-    if (injection.customFunc) {
-      return this.disableCustomInjections(injection);
-    }
-
-    return this.disableContentScripts(injection);
-  }
-
-  disableCustomInjections(injection) {
-    const disableFunc = injection.customFunc + "Disable";
-
-    if (disableFunc in this._customFunctions) {
-      this._customFunctions[disableFunc](injection);
-      injection.active = false;
-    } else {
-      console.error(
-        `Provided function ${disableFunc} for disabling injection wasn't found in functions list`
-      );
-    }
-  }
-
-  async disableContentScripts(injection) {
-    const contentScript = this._activeInjections.get(injection);
-    await contentScript.unregister();
-    this._activeInjections.delete(injection);
-    injection.active = false;
-  }
-}
-
-module.exports = Injections;
diff --git a/mobile/android/extensions/webcompat/lib/module_shim.js b/mobile/android/extensions/webcompat/lib/module_shim.js
deleted file mode 100644
index 2fd39fdbbd9e..000000000000
--- a/mobile/android/extensions/webcompat/lib/module_shim.js
+++ /dev/null
@@ -1,24 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/**
- * We cannot yet use proper JS modules within webextensions, as support for them
- * is highly experimental and highly instable. So we end up just including all
- * the JS files we need as separate background scripts, and since they all are
- * executed within the same context, this works for our in-browser deployment.
- *
- * However, this code is tracked outside of mozilla-central, and we work on
- * shipping this code in other products, like android-components as well.
- * Because of that, we have automated tests running within that repository. To
- * make our lives easier, we add `module.exports` statements to the JS source
- * files, so we can easily import their contents into our NodeJS-based test
- * suite.
- *
- * This works fine, but obviously, `module` is not defined when running
- * in-browser. So let's use this empty object as a shim, so we don't run into
- * runtime exceptions because of that.
- */
-var module = {};
diff --git a/mobile/android/extensions/webcompat/lib/ua_overrides.js b/mobile/android/extensions/webcompat/lib/ua_overrides.js
deleted file mode 100644
index 40f6c5192f25..000000000000
--- a/mobile/android/extensions/webcompat/lib/ua_overrides.js
+++ /dev/null
@@ -1,254 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* globals browser, module */
-
-class UAOverrides {
-  constructor(availableOverrides) {
-    this.OVERRIDE_PREF = "perform_ua_overrides";
-
-    this._overridesEnabled = true;
-
-    this._availableOverrides = availableOverrides;
-    this._activeListeners = new Map();
-  }
-
-  bindAboutCompatBroker(broker) {
-    this._aboutCompatBroker = broker;
-  }
-
-  bootup() {
-    browser.aboutConfigPrefs.onPrefChange.addListener(() => {
-      this.checkOverridePref();
-    }, this.OVERRIDE_PREF);
-    this.checkOverridePref();
-  }
-
-  checkOverridePref() {
-    browser.aboutConfigPrefs.getPref(this.OVERRIDE_PREF).then(value => {
-      if (value === undefined) {
-        browser.aboutConfigPrefs.setPref(this.OVERRIDE_PREF, true);
-      } else if (value === false) {
-        this.unregisterUAOverrides();
-      } else {
-        this.registerUAOverrides();
-      }
-    });
-  }
-
-  getAvailableOverrides() {
-    return this._availableOverrides;
-  }
-
-  isEnabled() {
-    return this._overridesEnabled;
-  }
-
-  enableOverride(override) {
-    if (override.active) {
-      return;
-    }
-
-    const { blocks, matches, telemetryKey, uaTransformer } = override.config;
-    const listener = details => {
-      // We set the "used" telemetry key if the user would have had the
-      // override applied, regardless of whether it is actually applied.
-      if (!details.frameId && override.shouldSendDetailedTelemetry) {
-        // For now, we only care about Telemetry on Fennec, where telemetry
-        // is sent in Java code (as part of the core ping). That code must
-        // be aware of each key we send, which we send as a SharedPreference.
-        browser.sharedPreferences.setBoolPref(`${telemetryKey}Used`, true);
-      }
-
-      // Don't actually override the UA for an experiment if the user is not
-      // part of the experiment (unless they force-enabed the override).
-      if (
-        !override.config.experiment ||
-        override.experimentActive ||
-        override.permanentPrefEnabled === true
-      ) {
-        for (const header of details.requestHeaders) {
-          if (header.name.toLowerCase() === "user-agent") {
-            header.value = uaTransformer(header.value);
-          }
-        }
-      }
-      return { requestHeaders: details.requestHeaders };
-    };
-
-    browser.webRequest.onBeforeSendHeaders.addListener(
-      listener,
-      { urls: matches },
-      ["blocking", "requestHeaders"]
-    );
-
-    const listeners = { onBeforeSendHeaders: listener };
-    if (blocks) {
-      const blistener = details => {
-        return { cancel: true };
-      };
-
-      browser.webRequest.onBeforeRequest.addListener(
-        blistener,
-        { urls: blocks },
-        ["blocking"]
-      );
-
-      listeners.onBeforeRequest = blistener;
-    }
-    this._activeListeners.set(override, listeners);
-    override.active = true;
-
-    // If telemetry is being collected, note the addon version.
-    if (telemetryKey) {
-      const { version } = browser.runtime.getManifest();
-      browser.sharedPreferences.setCharPref(`${telemetryKey}Version`, version);
-    }
-
-    // If collecting detailed telemetry on the override, note that it was activated.
-    if (override.shouldSendDetailedTelemetry) {
-      browser.sharedPreferences.setBoolPref(`${telemetryKey}Ready`, true);
-    }
-  }
-
-  onOverrideConfigChanged(override) {
-    // Check whether the override should be hidden from about:compat.
-    override.hidden = override.config.hidden;
-
-    // Also hide if the override is in an experiment the user is not part of.
-    if (override.config.experiment && !override.experimentActive) {
-      override.hidden = true;
-    }
-
-    // Setting the override's permanent pref overrules whether it is hidden.
-    if (override.permanentPrefEnabled !== undefined) {
-      override.hidden = !override.permanentPrefEnabled;
-    }
-
-    // Also check whether the override should be active.
-    let shouldBeActive = true;
-
-    // Overrides can be force-deactivated by their permanent preference.
-    if (override.permanentPrefEnabled === false) {
-      shouldBeActive = false;
-    }
-
-    // Only send detailed telemetry if the user is actively in an experiment or
-    // has opted into an experimental feature.
-    override.shouldSendDetailedTelemetry =
-      override.config.telemetryKey &&
-      (override.experimentActive || override.permanentPrefEnabled);
-
-    // Overrides gated behind an experiment the user is not part of do not
-    // have to be activated, unless they are gathering telemetry, or the
-    // user has force-enabled them with their permanent pref.
-    if (
-      override.config.experiment &&
-      !override.experimentActive &&
-      !override.config.telemetryKey &&
-      override.permanentPrefEnabled !== true
-    ) {
-      shouldBeActive = false;
-    }
-
-    if (shouldBeActive) {
-      this.enableOverride(override);
-    } else {
-      this.disableOverride(override);
-    }
-
-    if (this._overridesEnabled) {
-      this._aboutCompatBroker.portsToAboutCompatTabs.broadcast({
-        overridesChanged: this._aboutCompatBroker.filterOverrides(
-          this._availableOverrides
-        ),
-      });
-    }
-  }
-
-  async registerUAOverrides() {
-    const platformMatches = ["all"];
-    let platformInfo = await browser.runtime.getPlatformInfo();
-    platformMatches.push(platformInfo.os == "android" ? "android" : "desktop");
-
-    for (const override of this._availableOverrides) {
-      if (platformMatches.includes(override.platform)) {
-        override.availableOnPlatform = true;
-
-        // Note whether the user is actively in the override's experiment (if any).
-        override.experimentActive = false;
-        const experiment = override.config.experiment;
-        if (experiment) {
-          // We expect the definition to have either one string for 'experiment'
-          // (just one branch) or an array of strings (multiple branches). So
-          // here we turn the string case into a one-element array for the loop.
-          const branches = Array.isArray(experiment)
-            ? experiment
-            : [experiment];
-          for (const branch of branches) {
-            if (await browser.experiments.isActive(branch)) {
-              override.experimentActive = true;
-              break;
-            }
-          }
-        }
-
-        // If there is a specific about:config preference governing
-        // this override, monitor its state.
-        const pref = override.config.permanentPref;
-        override.permanentPrefEnabled =
-          pref && (await browser.aboutConfigPrefs.getPref(pref));
-        if (pref) {
-          const checkOverridePref = () => {
-            browser.aboutConfigPrefs.getPref(pref).then(value => {
-              override.permanentPrefEnabled = value;
-              this.onOverrideConfigChanged(override);
-            });
-          };
-          browser.aboutConfigPrefs.onPrefChange.addListener(
-            checkOverridePref,
-            pref
-          );
-        }
-
-        this.onOverrideConfigChanged(override);
-      }
-    }
-
-    this._overridesEnabled = true;
-    this._aboutCompatBroker.portsToAboutCompatTabs.broadcast({
-      overridesChanged: this._aboutCompatBroker.filterOverrides(
-        this._availableOverrides
-      ),
-    });
-  }
-
-  unregisterUAOverrides() {
-    for (const override of this._availableOverrides) {
-      this.disableOverride(override);
-    }
-
-    this._overridesEnabled = false;
-    this._aboutCompatBroker.portsToAboutCompatTabs.broadcast({
-      overridesChanged: false,
-    });
-  }
-
-  disableOverride(override) {
-    if (!override.active) {
-      return;
-    }
-
-    const listeners = this._activeListeners.get(override);
-    for (const [name, listener] of Object.entries(listeners)) {
-      browser.webRequest[name].removeListener(listener);
-    }
-    override.active = false;
-    this._activeListeners.delete(override);
-  }
-}
-
-module.exports = UAOverrides;
diff --git a/mobile/android/extensions/webcompat/manifest.json b/mobile/android/extensions/webcompat/manifest.json
deleted file mode 100644
index c209723ea384..000000000000
--- a/mobile/android/extensions/webcompat/manifest.json
+++ /dev/null
@@ -1,70 +0,0 @@
-{
-  "manifest_version": 2,
-  "name": "Web Compat",
-  "description": "Urgent post-release fixes for web compatibility.",
-  "version": "6.4.0",
-
-  "applications": {
-    "gecko": {
-      "id": "webcompat@mozilla.org",
-      "strict_min_version": "59.0b5"
-    }
-  },
-
-  "experiment_apis": {
-    "aboutConfigPrefs": {
-      "schema": "experiment-apis/aboutConfigPrefs.json",
-      "parent": {
-        "scopes": ["addon_parent"],
-        "script": "experiment-apis/aboutConfigPrefs.js",
-        "paths": [["aboutConfigPrefs"]]
-      }
-    },
-    "aboutPage": {
-      "schema": "about-compat/aboutPage.json",
-      "parent": {
-        "scopes": ["addon_parent"],
-        "script": "about-compat/aboutPage.js",
-        "events": ["startup"]
-      }
-    },
-    "experiments": {
-      "schema": "experiment-apis/experiments.json",
-      "parent": {
-        "scopes": ["addon_parent"],
-        "script": "experiment-apis/experiments.js",
-        "paths": [["experiments"]]
-      }
-    },
-    "sharedPreferences": {
-      "schema": "experiment-apis/sharedPreferences.json",
-      "parent": {
-        "scopes": ["addon_parent"],
-        "script": "experiment-apis/sharedPreferences.js",
-        "paths": [["sharedPreferences"]]
-      }
-    }
-  },
-
-  "content_security_policy": "script-src 'self' 'sha256-MmZkN2QaIHhfRWPZ8TVRjijTn5Ci1iEabtTEWrt9CCo='; default-src 'self'; base-uri moz-extension://*; object-src 'none'",
-
-  "permissions": [
-    "webRequest",
-    "webRequestBlocking",
-    "<all_urls>"
-  ],
-
-  "background": {
-    "scripts": [
-      "lib/module_shim.js",
-      "lib/google.js",
-      "data/injections.js",
-      "data/ua_overrides.js",
-      "lib/about_compat_broker.js",
-      "lib/custom_functions.js",
-      "lib/injections.js",
-      "lib/ua_overrides.js",
-      "run.js"
-    ]
-  }
-}
diff --git a/mobile/android/extensions/webcompat/moz.build b/mobile/android/extensions/webcompat/moz.build
deleted file mode 100644
index d15f816d75f2..000000000000
--- a/mobile/android/extensions/webcompat/moz.build
+++ /dev/null
@@ -1,81 +0,0 @@
-# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
-# vim: set filetype=python:
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-DEFINES['MOZ_APP_VERSION'] = CONFIG['MOZ_APP_VERSION']
-DEFINES['MOZ_APP_MAXVERSION'] = CONFIG['MOZ_APP_MAXVERSION']
-
-FINAL_TARGET_FILES.features['webcompat@mozilla.org'] += [
-  'manifest.json',
-  'run.js',
-]
-
-FINAL_TARGET_FILES.features['webcompat@mozilla.org']['about-compat'] += [
-  'about-compat/aboutCompat.css',
-  'about-compat/aboutCompat.html',
-  'about-compat/aboutCompat.js',
-  'about-compat/AboutCompat.jsm',
-  'about-compat/aboutPage.js',
-  'about-compat/aboutPage.json',
-  'about-compat/aboutPageProcessScript.js',
-]
-
-FINAL_TARGET_FILES.features['webcompat@mozilla.org']['data'] += [
-  'data/injections.js',
-  'data/ua_overrides.js',
-]
-
-FINAL_TARGET_FILES.features['webcompat@mozilla.org']['experiment-apis'] += [
-  'experiment-apis/aboutConfigPrefs.js',
-  'experiment-apis/aboutConfigPrefs.json',
-  'experiment-apis/experiments.js',
-  'experiment-apis/experiments.json',
-  'experiment-apis/sharedPreferences.js',
-  'experiment-apis/sharedPreferences.json',
-]
-
-FINAL_TARGET_FILES.features['webcompat@mozilla.org']['injections']['css'] += [
-  'injections/css/bug0000000-testbed-css-injection.css',
-  'injections/css/bug1305028-gaming.youtube.com-webkit-scrollbar.css',
-  'injections/css/bug1432935-discordapp.com-webkit-scorllbar-white-line.css',
-  'injections/css/bug1518781-twitch.tv-webkit-scrollbar.css',
-  'injections/css/bug1526977-sreedharscce.in-login-fix.css',
-  'injections/css/bug1561371-mail.google.com-allow-horizontal-scrolling.css',
-  'injections/css/bug1567610-dns.google.com-moz-fit-content.css',
-  'injections/css/bug1568256-zertifikate.commerzbank.de-flex.css',
-  'injections/css/bug1568908-console.cloud.google.com-scrollbar-fix.css',
-  'injections/css/bug1570119-teamcoco.com-scrollbar-width.css',
-  'injections/css/bug1570328-developer-apple.com-transform-scale.css',
-  'injections/css/bug1574973-patch.com-dropdown-menu-fix.css',
-  'injections/css/bug1575000-apply.lloydsbank.co.uk-radio-buttons-fix.css',
-  'injections/css/bug1575011-holiday-weather.com-scrolling-fix.css',
-  'injections/css/bug1575017-dunkindonuts.com-flex-basis.css',
-  'injections/css/bug1577270-binance.com-calc-height-fix.css',
-  'injections/css/bug1577297-kitkat.com.au-slider-width-fix.css'
-]
-
-FINAL_TARGET_FILES.features['webcompat@mozilla.org']['injections']['js'] += [
-  'injections/js/bug0000000-testbed-js-injection.js',
-  'injections/js/bug1452707-window.controllers-shim-ib.absa.co.za.js',
-  'injections/js/bug1457335-histography.io-ua-change.js',
-  'injections/js/bug1472075-bankofamerica.com-ua-change.js',
-  'injections/js/bug1472081-election.gov.np-window.sidebar-shim.js',
-  'injections/js/bug1482066-portalminasnet.com-window.sidebar-shim.js',
-  'injections/js/bug1570856-medium.com-menu-isTier1.js',
-  'injections/js/bug1577245-salesforce-communities-hide-unsupported.js',
-  'injections/js/bug1579159-m.tailieu.vn-pdfjs-worker-disable.js'
-]
-
-FINAL_TARGET_FILES.features['webcompat@mozilla.org']['lib'] += [
-  'lib/about_compat_broker.js',
-  'lib/custom_functions.js',
-  'lib/google.js',
-  'lib/injections.js',
-  'lib/module_shim.js',
-  'lib/ua_overrides.js',
-]
-
-with Files('**'):
-  BUG_COMPONENT = ('Web Compatibility Tools', 'Go Faster')
diff --git a/mobile/android/extensions/webcompat/run.js b/mobile/android/extensions/webcompat/run.js
deleted file mode 100644
index 5e8cf2df65a4..000000000000
--- a/mobile/android/extensions/webcompat/run.js
+++ /dev/null
@@ -1,20 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/* globals AVAILABLE_INJECTIONS, AVAILABLE_UA_OVERRIDES, AboutCompatBroker,
-           Injections, UAOverrides, CUSTOM_FUNCTIONS */
-
-const injections = new Injections(AVAILABLE_INJECTIONS, CUSTOM_FUNCTIONS);
-const uaOverrides = new UAOverrides(AVAILABLE_UA_OVERRIDES);
-
-const aboutCompatBroker = new AboutCompatBroker({
-  injections,
-  uaOverrides,
-});
-
-aboutCompatBroker.bootup();
-injections.bootup();
-uaOverrides.bootup();
diff --git a/mobile/android/moz.build b/mobile/android/moz.build
index 50c8e471fe37..3a8dea3dd1a3 100644
--- a/mobile/android/moz.build
+++ b/mobile/android/moz.build
@@ -47,7 +47,6 @@ DIRS += [
     'base',
     'chrome',
     'components',
-    'extensions',
     'modules',
     'themes/core',
     'themes/geckoview',
diff --git a/tools/lint/license.yml b/tools/lint/license.yml
index c85b8ea3a19c..11540c9ee24c 100644
--- a/tools/lint/license.yml
+++ b/tools/lint/license.yml
@@ -47,9 +47,7 @@ license:
         - media/mtransport/mdns_service/mdns_service.h
         - media/webrtc/signaling/src/sdp
         - mobile/android/branding
-        - mobile/android/chrome/content/ExtensionPermissions.js
         - mobile/android/components/extensions
-        - mobile/android/extensions/webcompat
         - mobile/android/geckoview/src/main/AndroidManifest.xml
         - mobile/android/geckoview/src/main/res/drawable/ic_generic_file.xml
         - mobile/android/geckoview_example/src/main