forked from mirrors/gecko-dev
		
	 2f419065da
			
		
	
	
		2f419065da
		
	
	
	
	
		
			
			This is a start, there are more modules and scripts we can/should move, as well as tests. Differential Revision: https://phabricator.services.mozilla.com/D210676
		
			
				
	
	
		
			756 lines
		
	
	
	
		
			24 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
			
		
		
	
	
			756 lines
		
	
	
	
		
			24 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
| /* This Source Code Form is subject to the terms of the Mozilla Public
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|  * License, v. 2.0. If a copy of the MPL was not distributed with this
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|  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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| 
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| // This file is loaded into the browser window scope.
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| /* eslint-env mozilla/browser-window */
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| 
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| /**
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|  * Controls the "full zoom" setting and its site-specific preferences.
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|  */
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| var FullZoom = {
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|   // Identifies the setting in the content prefs database.
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|   name: "browser.content.full-zoom",
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| 
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|   // browser.zoom.siteSpecific preference cache
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|   _siteSpecificPref: undefined,
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| 
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|   // browser.zoom.updateBackgroundTabs preference cache
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|   updateBackgroundTabs: undefined,
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| 
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|   // This maps the browser to monotonically increasing integer
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|   // tokens. _browserTokenMap[browser] is increased each time the zoom is
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|   // changed in the browser. See _getBrowserToken and _ignorePendingZoomAccesses.
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|   _browserTokenMap: new WeakMap(),
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| 
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|   // Stores initial locations if we receive onLocationChange
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|   // events before we're initialized.
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|   _initialLocations: new WeakMap(),
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| 
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|   get siteSpecific() {
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|     if (this._siteSpecificPref === undefined) {
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|       this._siteSpecificPref = Services.prefs.getBoolPref(
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|         "browser.zoom.siteSpecific"
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|       );
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|     }
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|     return this._siteSpecificPref;
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|   },
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| 
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|   // nsISupports
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| 
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|   QueryInterface: ChromeUtils.generateQI([
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|     "nsIObserver",
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|     "nsIContentPrefObserver",
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|     "nsISupportsWeakReference",
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|   ]),
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| 
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|   // Initialization & Destruction
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| 
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|   init: function FullZoom_init() {
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|     gBrowser.addEventListener("DoZoomEnlargeBy10", this);
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|     gBrowser.addEventListener("DoZoomReduceBy10", this);
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|     window.addEventListener("MozScaleGestureComplete", this);
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| 
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|     // Register ourselves with the service so we know when our pref changes.
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|     this._cps2 = Cc["@mozilla.org/content-pref/service;1"].getService(
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|       Ci.nsIContentPrefService2
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|     );
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|     this._cps2.addObserverForName(this.name, this);
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| 
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|     this.updateBackgroundTabs = Services.prefs.getBoolPref(
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|       "browser.zoom.updateBackgroundTabs"
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|     );
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| 
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|     // Listen for changes to the browser.zoom branch so we can enable/disable
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|     // updating background tabs and per-site saving and restoring of zoom levels.
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|     Services.prefs.addObserver("browser.zoom.", this, true);
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| 
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|     // If we received onLocationChange events for any of the current browsers
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|     // before we were initialized we want to replay those upon initialization.
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|     for (let browser of gBrowser.browsers) {
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|       if (this._initialLocations.has(browser)) {
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|         this.onLocationChange(...this._initialLocations.get(browser), browser);
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|       }
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|     }
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| 
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|     // This should be nulled after initialization.
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|     this._initialLocations = null;
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|   },
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| 
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|   destroy: function FullZoom_destroy() {
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|     Services.prefs.removeObserver("browser.zoom.", this);
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|     this._cps2.removeObserverForName(this.name, this);
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|     gBrowser.removeEventListener("DoZoomEnlargeBy10", this);
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|     gBrowser.removeEventListener("DoZoomReduceBy10", this);
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|     window.removeEventListener("MozScaleGestureComplete", this);
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|   },
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| 
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|   // Event Handlers
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| 
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|   // EventListener
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| 
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|   handleEvent: function FullZoom_handleEvent(event) {
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|     switch (event.type) {
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|       case "DoZoomEnlargeBy10":
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|         this.changeZoomBy(this._getTargetedBrowser(event), 0.1);
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|         break;
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|       case "DoZoomReduceBy10":
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|         this.changeZoomBy(this._getTargetedBrowser(event), -0.1);
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|         break;
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|       case "MozScaleGestureComplete": {
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|         let nonDefaultScalingZoom = event.detail != 1.0;
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|         this.updateCommands(nonDefaultScalingZoom);
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|         break;
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|       }
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|     }
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|   },
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| 
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|   // nsIObserver
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| 
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|   observe(aSubject, aTopic, aData) {
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|     switch (aTopic) {
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|       case "nsPref:changed":
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|         switch (aData) {
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|           case "browser.zoom.siteSpecific":
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|             // Invalidate pref cache.
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|             this._siteSpecificPref = undefined;
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|             break;
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|           case "browser.zoom.updateBackgroundTabs":
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|             this.updateBackgroundTabs = Services.prefs.getBoolPref(
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|               "browser.zoom.updateBackgroundTabs"
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|             );
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|             break;
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|           case "browser.zoom.full": {
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|             this.updateCommands();
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|             break;
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|           }
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|         }
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|         break;
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|     }
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|   },
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| 
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|   // nsIContentPrefObserver
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| 
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|   onContentPrefSet: function FullZoom_onContentPrefSet(
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|     aGroup,
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|     aName,
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|     aValue,
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|     aIsPrivate
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|   ) {
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|     this._onContentPrefChanged(aGroup, aValue, aIsPrivate);
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|   },
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| 
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|   onContentPrefRemoved: function FullZoom_onContentPrefRemoved(
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|     aGroup,
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|     aName,
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|     aIsPrivate
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|   ) {
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|     this._onContentPrefChanged(aGroup, undefined, aIsPrivate);
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|   },
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| 
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|   /**
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|    * Appropriately updates the zoom level after a content preference has
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|    * changed.
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|    *
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|    * @param aGroup  The group of the changed preference.
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|    * @param aValue  The new value of the changed preference.  Pass undefined to
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|    *                indicate the preference's removal.
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|    */
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|   _onContentPrefChanged: function FullZoom__onContentPrefChanged(
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|     aGroup,
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|     aValue,
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|     aIsPrivate
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|   ) {
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|     if (this._isNextContentPrefChangeInternal) {
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|       // Ignore changes that FullZoom itself makes.  This works because the
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|       // content pref service calls callbacks before notifying observers, and it
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|       // does both in the same turn of the event loop.
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|       delete this._isNextContentPrefChangeInternal;
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|       return;
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|     }
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| 
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|     let browser = gBrowser.selectedBrowser;
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|     if (!browser.currentURI) {
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|       return;
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|     }
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| 
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|     if (this._isPDFViewer(browser)) {
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|       return;
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|     }
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| 
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|     let ctxt = this._loadContextFromBrowser(browser);
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|     let domain = this._cps2.extractDomain(browser.currentURI.spec);
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|     if (aGroup) {
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|       if (aGroup == domain && ctxt.usePrivateBrowsing == aIsPrivate) {
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|         this._applyPrefToZoom(aValue, browser);
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|       }
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|       return;
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|     }
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| 
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|     // If the current page doesn't have a site-specific preference, then its
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|     // zoom should be set to the new global preference now that the global
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|     // preference has changed.
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|     let hasPref = false;
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|     let token = this._getBrowserToken(browser);
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|     this._cps2.getByDomainAndName(browser.currentURI.spec, this.name, ctxt, {
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|       handleResult() {
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|         hasPref = true;
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|       },
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|       handleCompletion: () => {
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|         if (!hasPref && token.isCurrent) {
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|           this._applyPrefToZoom(undefined, browser);
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|         }
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|       },
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|     });
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|   },
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| 
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|   // location change observer
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| 
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|   /**
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|    * Called when the location of a tab changes.
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|    * When that happens, we need to update the current zoom level if appropriate.
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|    *
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|    * @param aURI
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|    *        A URI object representing the new location.
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|    * @param aIsTabSwitch
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|    *        Whether this location change has happened because of a tab switch.
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|    * @param aBrowser
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|    *        (optional) browser object displaying the document
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|    */
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|   onLocationChange: function FullZoom_onLocationChange(
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|     aURI,
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|     aIsTabSwitch,
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|     aBrowser
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|   ) {
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|     let browser = aBrowser || gBrowser.selectedBrowser;
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| 
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|     // If we haven't been initialized yet but receive an onLocationChange
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|     // notification then let's store and replay it upon initialization.
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|     if (this._initialLocations) {
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|       this._initialLocations.set(browser, [aURI, aIsTabSwitch]);
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|       return;
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|     }
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| 
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|     // Ignore all pending async zoom accesses in the browser.  Pending accesses
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|     // that started before the location change will be prevented from applying
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|     // to the new location.
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|     this._ignorePendingZoomAccesses(browser);
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| 
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|     if (!aURI || (aIsTabSwitch && !this._isSiteSpecific(browser))) {
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|       this._notifyOnLocationChange(browser);
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|       return;
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|     }
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| 
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|     if (aURI.spec == "about:blank") {
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|       if (
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|         !browser.contentPrincipal ||
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|         browser.contentPrincipal.isNullPrincipal
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|       ) {
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|         // For an about:blank with a null principal, zooming any amount does not
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|         // make any sense - so simply do 100%.
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|         this._applyPrefToZoom(
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|           1,
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|           browser,
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|           this._notifyOnLocationChange.bind(this, browser)
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|         );
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|       } else {
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|         // If it's not a null principal, there may be content loaded into it,
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|         // so use the global pref. This will avoid a cps2 roundtrip if we've
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|         // already loaded the global pref once. Really, this should probably
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|         // use the contentPrincipal's origin if it's an http(s) principal.
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|         // (See bug 1457597)
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|         this._applyPrefToZoom(
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|           undefined,
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|           browser,
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|           this._notifyOnLocationChange.bind(this, browser)
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|         );
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|       }
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|       return;
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|     }
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| 
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|     // Media documents should always start at 1, and are not affected by prefs.
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|     if (!aIsTabSwitch && browser.isSyntheticDocument) {
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|       ZoomManager.setZoomForBrowser(browser, 1);
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|       // _ignorePendingZoomAccesses already called above, so no need here.
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|       this._notifyOnLocationChange(browser);
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|       return;
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|     }
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| 
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|     // The PDF viewer zooming isn't handled by `ZoomManager`, ensure that the
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|     // browser zoom level always gets reset to 100% on load (to prevent the
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|     // UI elements of the PDF viewer from being zoomed in/out on load).
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|     if (this._isPDFViewer(browser)) {
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|       this._applyPrefToZoom(
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|         1,
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|         browser,
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|         this._notifyOnLocationChange.bind(this, browser)
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|       );
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|       return;
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|     }
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| 
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|     // See if the zoom pref is cached.
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|     let ctxt = this._loadContextFromBrowser(browser);
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|     let pref = this._cps2.getCachedByDomainAndName(aURI.spec, this.name, ctxt);
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|     if (pref) {
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|       this._applyPrefToZoom(
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|         pref.value,
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|         browser,
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|         this._notifyOnLocationChange.bind(this, browser)
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|       );
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|       return;
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|     }
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| 
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|     // It's not cached, so we have to asynchronously fetch it.
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|     let value = undefined;
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|     let token = this._getBrowserToken(browser);
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|     this._cps2.getByDomainAndName(aURI.spec, this.name, ctxt, {
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|       handleResult(resultPref) {
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|         value = resultPref.value;
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|       },
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|       handleCompletion: () => {
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|         if (!token.isCurrent) {
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|           this._notifyOnLocationChange(browser);
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|           return;
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|         }
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|         this._applyPrefToZoom(
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|           value,
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|           browser,
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|           this._notifyOnLocationChange.bind(this, browser)
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|         );
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|       },
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|     });
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|   },
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| 
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|   // update state of zoom menu items
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| 
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|   /**
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|    * Updates the current windows Zoom commands for zooming in, zooming out
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|    * and resetting the zoom level.
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|    *
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|    * @param {boolean} [forceResetEnabled=false]
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|    *   Set to true if the zoom reset command should be enabled regardless of
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|    *   whether or not the ZoomManager.zoom level is at 1.0. This is specifically
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|    *   for when using scaling zoom via the pinch gesture which doesn't cause
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|    *   the ZoomManager.zoom level to change.
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|    * @returns Promise
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|    * @resolves undefined
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|    */
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|   updateCommands: async function FullZoom_updateCommands(
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|     forceResetEnabled = false
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|   ) {
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|     let zoomLevel = ZoomManager.zoom;
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|     let defaultZoomLevel = await ZoomUI.getGlobalValue();
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|     let reduceCmd = document.getElementById("cmd_fullZoomReduce");
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|     if (zoomLevel == ZoomManager.MIN) {
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|       reduceCmd.setAttribute("disabled", "true");
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|     } else {
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|       reduceCmd.removeAttribute("disabled");
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|     }
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| 
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|     let enlargeCmd = document.getElementById("cmd_fullZoomEnlarge");
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|     if (zoomLevel == ZoomManager.MAX) {
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|       enlargeCmd.setAttribute("disabled", "true");
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|     } else {
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|       enlargeCmd.removeAttribute("disabled");
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|     }
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| 
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|     let resetCmd = document.getElementById("cmd_fullZoomReset");
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|     if (zoomLevel == defaultZoomLevel && !forceResetEnabled) {
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|       resetCmd.setAttribute("disabled", "true");
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|     } else {
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|       resetCmd.removeAttribute("disabled");
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|     }
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| 
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|     let fullZoomCmd = document.getElementById("cmd_fullZoomToggle");
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|     if (!ZoomManager.useFullZoom) {
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|       fullZoomCmd.setAttribute("checked", "true");
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|     } else {
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|       fullZoomCmd.setAttribute("checked", "false");
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|     }
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|   },
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| 
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|   // Setting & Pref Manipulation
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| 
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|   sendMessageToPDFViewer(browser, name) {
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|     try {
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|       browser.sendMessageToActor(name, {}, "Pdfjs");
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|     } catch (ex) {
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|       console.error(ex);
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|     }
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|   },
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| 
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|   /**
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|    * If browser in reader mode sends message to reader in order to decrease font size,
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|    * Otherwise reduces the zoom level of the page in the current browser.
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|    */
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|   async reduce() {
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|     let browser = gBrowser.selectedBrowser;
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|     if (browser.currentURI.spec.startsWith("about:reader")) {
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|       browser.sendMessageToActor("Reader:ZoomOut", {}, "AboutReader");
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|     } else if (this._isPDFViewer(browser)) {
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|       this.sendMessageToPDFViewer(browser, "PDFJS:ZoomOut");
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|     } else {
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|       ZoomManager.reduce();
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|       this._ignorePendingZoomAccesses(browser);
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|       await this._applyZoomToPref(browser);
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|     }
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|   },
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| 
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|   /**
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|    * If browser in reader mode sends message to reader in order to increase font size,
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|    * Otherwise enlarges the zoom level of the page in the current browser.
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|    */
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|   async enlarge() {
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|     let browser = gBrowser.selectedBrowser;
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|     if (browser.currentURI.spec.startsWith("about:reader")) {
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|       browser.sendMessageToActor("Reader:ZoomIn", {}, "AboutReader");
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|     } else if (this._isPDFViewer(browser)) {
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|       this.sendMessageToPDFViewer(browser, "PDFJS:ZoomIn");
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|     } else {
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|       ZoomManager.enlarge();
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|       this._ignorePendingZoomAccesses(browser);
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|       await this._applyZoomToPref(browser);
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|     }
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|   },
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| 
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|   /**
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|    * If browser in reader mode sends message to reader in order to increase font size,
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|    * Otherwise enlarges the zoom level of the page in the current browser.
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|    * This function is not async like reduce/enlarge, because it is invoked by our
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|    * event handler. This means that the call to _applyZoomToPref is not awaited and
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|    * will happen asynchronously.
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|    */
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|   changeZoomBy(aBrowser, aValue) {
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|     if (aBrowser.currentURI.spec.startsWith("about:reader")) {
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|       const message = aValue > 0 ? "Reader::ZoomIn" : "Reader:ZoomOut";
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|       aBrowser.sendMessageToActor(message, {}, "AboutReader");
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|       return;
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|     } else if (this._isPDFViewer(aBrowser)) {
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|       const message = aValue > 0 ? "PDFJS::ZoomIn" : "PDFJS:ZoomOut";
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|       this.sendMessageToPDFViewer(aBrowser, message);
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|       return;
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|     }
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|     let zoom = ZoomManager.getZoomForBrowser(aBrowser);
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|     zoom += aValue;
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|     if (zoom < ZoomManager.MIN) {
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|       zoom = ZoomManager.MIN;
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|     } else if (zoom > ZoomManager.MAX) {
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|       zoom = ZoomManager.MAX;
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|     }
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|     ZoomManager.setZoomForBrowser(aBrowser, zoom);
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|     this._ignorePendingZoomAccesses(aBrowser);
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|     this._applyZoomToPref(aBrowser);
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|   },
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| 
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|   /**
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|    * Sets the zoom level for the given browser to the given floating
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|    * point value, where 1 is the default zoom level.
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|    */
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|   setZoom(value, browser = gBrowser.selectedBrowser) {
 | |
|     if (this._isPDFViewer(browser)) {
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|       return;
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|     }
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|     ZoomManager.setZoomForBrowser(browser, value);
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|     this._ignorePendingZoomAccesses(browser);
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|     this._applyZoomToPref(browser);
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|   },
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| 
 | |
|   /**
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|    * Sets the zoom level of the page in the given browser to the global zoom
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|    * level.
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|    *
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|    * @return A promise which resolves when the zoom reset has been applied.
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|    */
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|   reset: function FullZoom_reset(browser = gBrowser.selectedBrowser) {
 | |
|     let forceValue;
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|     if (browser.currentURI.spec.startsWith("about:reader")) {
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|       browser.sendMessageToActor("Reader:ResetZoom", {}, "AboutReader");
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|     } else if (this._isPDFViewer(browser)) {
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|       this.sendMessageToPDFViewer(browser, "PDFJS:ZoomReset");
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|       // Ensure that the UI elements of the PDF viewer won't be zoomed in/out
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|       // on reset, even if/when browser default zoom value is not set to 100%.
 | |
|       forceValue = 1;
 | |
|     }
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|     let token = this._getBrowserToken(browser);
 | |
|     let result = ZoomUI.getGlobalValue().then(value => {
 | |
|       if (token.isCurrent) {
 | |
|         ZoomManager.setZoomForBrowser(browser, forceValue || value);
 | |
|         this._ignorePendingZoomAccesses(browser);
 | |
|       }
 | |
|     });
 | |
|     this._removePref(browser);
 | |
|     return result;
 | |
|   },
 | |
| 
 | |
|   /**
 | |
|    * Called from the URL bar's inline zoom reset indicator button.
 | |
|    *
 | |
|    * @param {Event} event the click/keyboard event that triggered the call.
 | |
|    */
 | |
|   resetFromURLBar(event) {
 | |
|     if (event.button > 0) {
 | |
|       return;
 | |
|     }
 | |
|     this.reset();
 | |
|     this.resetScalingZoom();
 | |
|   },
 | |
| 
 | |
|   resetScalingZoom: function FullZoom_resetScaling(
 | |
|     browser = gBrowser.selectedBrowser
 | |
|   ) {
 | |
|     browser.browsingContext?.resetScalingZoom();
 | |
|   },
 | |
| 
 | |
|   /**
 | |
|    * Set the zoom level for a given browser.
 | |
|    *
 | |
|    * Per nsPresContext::setFullZoom, we can set the zoom to its current value
 | |
|    * without significant impact on performance, as the setting is only applied
 | |
|    * if it differs from the current setting.  In fact getting the zoom and then
 | |
|    * checking ourselves if it differs costs more.
 | |
|    *
 | |
|    * And perhaps we should always set the zoom even if it was more expensive,
 | |
|    * since nsDocumentViewer::SetTextZoom claims that child documents can have
 | |
|    * a different text zoom (although it would be unusual), and it implies that
 | |
|    * those child text zooms should get updated when the parent zoom gets set,
 | |
|    * and perhaps the same is true for full zoom
 | |
|    * (although nsDocumentViewer::SetFullZoom doesn't mention it).
 | |
|    *
 | |
|    * So when we apply new zoom values to the browser, we simply set the zoom.
 | |
|    * We don't check first to see if the new value is the same as the current
 | |
|    * one.
 | |
|    *
 | |
|    * @param aValue     The zoom level value.
 | |
|    * @param aBrowser   The zoom is set in this browser.  Required.
 | |
|    * @param aCallback  If given, it's asynchronously called when complete.
 | |
|    */
 | |
|   _applyPrefToZoom: function FullZoom__applyPrefToZoom(
 | |
|     aValue,
 | |
|     aBrowser,
 | |
|     aCallback
 | |
|   ) {
 | |
|     // The browser is sometimes half-destroyed because this method is called
 | |
|     // by content pref service callbacks, which themselves can be called at any
 | |
|     // time, even after browsers are closed.
 | |
|     if (
 | |
|       !aBrowser.mInitialized ||
 | |
|       aBrowser.isSyntheticDocument ||
 | |
|       (!this._isSiteSpecific(aBrowser) && aBrowser.tabHasCustomZoom)
 | |
|     ) {
 | |
|       this._executeSoon(aCallback);
 | |
|       return;
 | |
|     }
 | |
| 
 | |
|     if (aValue !== undefined && this._isSiteSpecific(aBrowser)) {
 | |
|       ZoomManager.setZoomForBrowser(aBrowser, this._ensureValid(aValue));
 | |
|       this._ignorePendingZoomAccesses(aBrowser);
 | |
|       this._executeSoon(aCallback);
 | |
|       return;
 | |
|     }
 | |
| 
 | |
|     // Above, we check if site-specific zoom is enabled before setting
 | |
|     // the tab browser zoom, however global zoom should work independent
 | |
|     // of the site-specific pref, so we do no checks here.
 | |
|     let token = this._getBrowserToken(aBrowser);
 | |
|     ZoomUI.getGlobalValue().then(value => {
 | |
|       if (token.isCurrent) {
 | |
|         ZoomManager.setZoomForBrowser(aBrowser, value);
 | |
|         this._ignorePendingZoomAccesses(aBrowser);
 | |
|       }
 | |
|       this._executeSoon(aCallback);
 | |
|     });
 | |
|   },
 | |
| 
 | |
|   /**
 | |
|    * Saves the zoom level of the page in the given browser to the content
 | |
|    * prefs store.
 | |
|    *
 | |
|    * @param browser  The zoom of this browser will be saved.  Required.
 | |
|    */
 | |
|   _applyZoomToPref: function FullZoom__applyZoomToPref(browser) {
 | |
|     if (!this._isSiteSpecific(browser) || browser.isSyntheticDocument) {
 | |
|       // If site-specific zoom is disabled, we have called this function
 | |
|       // to adjust our tab's zoom level. It is now considered "custom"
 | |
|       // and we mark that here.
 | |
|       browser.tabHasCustomZoom = !this._isSiteSpecific(browser);
 | |
|       return null;
 | |
|     }
 | |
| 
 | |
|     return new Promise(resolve => {
 | |
|       this._cps2.set(
 | |
|         browser.currentURI.spec,
 | |
|         this.name,
 | |
|         ZoomManager.getZoomForBrowser(browser),
 | |
|         this._loadContextFromBrowser(browser),
 | |
|         {
 | |
|           handleCompletion: () => {
 | |
|             this._isNextContentPrefChangeInternal = true;
 | |
|             resolve();
 | |
|           },
 | |
|         }
 | |
|       );
 | |
|     });
 | |
|   },
 | |
| 
 | |
|   /**
 | |
|    * Removes from the content prefs store the zoom level of the given browser.
 | |
|    *
 | |
|    * @param browser  The zoom of this browser will be removed.  Required.
 | |
|    */
 | |
|   _removePref: function FullZoom__removePref(browser) {
 | |
|     if (browser.isSyntheticDocument) {
 | |
|       return;
 | |
|     }
 | |
|     let ctxt = this._loadContextFromBrowser(browser);
 | |
|     this._cps2.removeByDomainAndName(browser.currentURI.spec, this.name, ctxt, {
 | |
|       handleCompletion: () => {
 | |
|         this._isNextContentPrefChangeInternal = true;
 | |
|       },
 | |
|     });
 | |
|   },
 | |
| 
 | |
|   // Utilities
 | |
| 
 | |
|   /**
 | |
|    * Returns the zoom change token of the given browser.  Asynchronous
 | |
|    * operations that access the given browser's zoom should use this method to
 | |
|    * capture the token before starting and use token.isCurrent to determine if
 | |
|    * it's safe to access the zoom when done.  If token.isCurrent is false, then
 | |
|    * after the async operation started, either the browser's zoom was changed or
 | |
|    * the browser was destroyed, and depending on what the operation is doing, it
 | |
|    * may no longer be safe to set and get its zoom.
 | |
|    *
 | |
|    * @param browser  The token of this browser will be returned.
 | |
|    * @return  An object with an "isCurrent" getter.
 | |
|    */
 | |
|   _getBrowserToken: function FullZoom__getBrowserToken(browser) {
 | |
|     let map = this._browserTokenMap;
 | |
|     if (!map.has(browser)) {
 | |
|       map.set(browser, 0);
 | |
|     }
 | |
|     return {
 | |
|       token: map.get(browser),
 | |
|       get isCurrent() {
 | |
|         // At this point, the browser may have been destructed and unbound but
 | |
|         // its outer ID not removed from the map because outer-window-destroyed
 | |
|         // hasn't been received yet.  In that case, the browser is unusable, it
 | |
|         // has no properties, so return false.  Check for this case by getting a
 | |
|         // property, say, docShell.
 | |
|         return map.get(browser) === this.token && browser.mInitialized;
 | |
|       },
 | |
|     };
 | |
|   },
 | |
| 
 | |
|   /**
 | |
|    * Returns the browser that the supplied zoom event is associated with.
 | |
|    * @param event  The zoom event.
 | |
|    * @return  The associated browser element, if one exists, otherwise null.
 | |
|    */
 | |
|   _getTargetedBrowser: function FullZoom__getTargetedBrowser(event) {
 | |
|     let target = event.originalTarget;
 | |
| 
 | |
|     // With remote content browsers, the event's target is the browser
 | |
|     // we're looking for.
 | |
|     const XUL_NS =
 | |
|       "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
 | |
|     if (
 | |
|       window.XULElement.isInstance(target) &&
 | |
|       target.localName == "browser" &&
 | |
|       target.namespaceURI == XUL_NS
 | |
|     ) {
 | |
|       return target;
 | |
|     }
 | |
| 
 | |
|     // With in-process content browsers, the event's target is the content
 | |
|     // document.
 | |
|     if (target.nodeType == Node.DOCUMENT_NODE) {
 | |
|       return target.ownerGlobal.docShell.chromeEventHandler;
 | |
|     }
 | |
| 
 | |
|     throw new Error("Unexpected zoom event source");
 | |
|   },
 | |
| 
 | |
|   /**
 | |
|    * Increments the zoom change token for the given browser so that pending
 | |
|    * async operations know that it may be unsafe to access they zoom when they
 | |
|    * finish.
 | |
|    *
 | |
|    * @param browser  Pending accesses in this browser will be ignored.
 | |
|    */
 | |
|   _ignorePendingZoomAccesses: function FullZoom__ignorePendingZoomAccesses(
 | |
|     browser
 | |
|   ) {
 | |
|     let map = this._browserTokenMap;
 | |
|     map.set(browser, (map.get(browser) || 0) + 1);
 | |
|   },
 | |
| 
 | |
|   _ensureValid: function FullZoom__ensureValid(aValue) {
 | |
|     // Note that undefined is a valid value for aValue that indicates a known-
 | |
|     // not-to-exist value.
 | |
|     if (isNaN(aValue)) {
 | |
|       return 1;
 | |
|     }
 | |
| 
 | |
|     if (aValue < ZoomManager.MIN) {
 | |
|       return ZoomManager.MIN;
 | |
|     }
 | |
| 
 | |
|     if (aValue > ZoomManager.MAX) {
 | |
|       return ZoomManager.MAX;
 | |
|     }
 | |
| 
 | |
|     return aValue;
 | |
|   },
 | |
| 
 | |
|   // Whether to remember the site specific zoom level for this browser.
 | |
|   // This returns false when `browser.zoom.siteSpecific` is false or
 | |
|   // the browser has content loaded that should resist fingerprinting.
 | |
|   _isSiteSpecific(aBrowser) {
 | |
|     if (!this.siteSpecific) {
 | |
|       return false;
 | |
|     }
 | |
|     return (
 | |
|       !aBrowser?.browsingContext?.topWindowContext.shouldResistFingerprinting ||
 | |
|       !ChromeUtils.shouldResistFingerprinting(
 | |
|         "SiteSpecificZoom",
 | |
|         aBrowser?.browsingContext?.topWindowContext
 | |
|           .overriddenFingerprintingSettings
 | |
|       )
 | |
|     );
 | |
|   },
 | |
| 
 | |
|   /**
 | |
|    * Gets the load context from the given Browser.
 | |
|    *
 | |
|    * @param Browser  The Browser whose load context will be returned.
 | |
|    * @return        The nsILoadContext of the given Browser.
 | |
|    */
 | |
|   _loadContextFromBrowser: function FullZoom__loadContextFromBrowser(browser) {
 | |
|     return browser.loadContext;
 | |
|   },
 | |
| 
 | |
|   /**
 | |
|    * Asynchronously broadcasts "browser-fullZoom:location-change" so that
 | |
|    * listeners can be notified when the zoom levels on those pages change.
 | |
|    * The notification is always asynchronous so that observers are guaranteed a
 | |
|    * consistent behavior.
 | |
|    */
 | |
|   _notifyOnLocationChange: function FullZoom__notifyOnLocationChange(browser) {
 | |
|     this._executeSoon(function () {
 | |
|       Services.obs.notifyObservers(browser, "browser-fullZoom:location-change");
 | |
|     });
 | |
|   },
 | |
| 
 | |
|   _executeSoon: function FullZoom__executeSoon(callback) {
 | |
|     if (!callback) {
 | |
|       return;
 | |
|     }
 | |
|     Services.tm.dispatchToMainThread(callback);
 | |
|   },
 | |
| 
 | |
|   _isPDFViewer(browser) {
 | |
|     return !!(
 | |
|       browser.contentPrincipal.spec == "resource://pdf.js/web/viewer.html"
 | |
|     );
 | |
|   },
 | |
| };
 |