diff --git a/.eslintignore b/.eslintignore
index 89b5e01c1ba4..be7ca64405f6 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -77,6 +77,10 @@ browser/base/content/newtab/**
 # Test files that are really json not js, and don't need to be linted.
 browser/components/sessionstore/test/unit/data/sessionstore_valid.js
 browser/components/sessionstore/test/unit/data/sessionstore_invalid.js
+# This file is split into two in order to keep it as a valid json file
+# for documentation purposes (policies.json) but to be accessed by the
+# code as a .jsm (schema.jsm)
+browser/components/enterprisepolicies/schemas/schema.jsm
 # generated & special files in cld2
 browser/components/translation/cld2/**
 # Screenshots and Follow-on search are imported as a system add-on and have
diff --git a/browser/components/enterprisepolicies/EnterprisePolicies.js b/browser/components/enterprisepolicies/EnterprisePolicies.js
new file mode 100644
index 000000000000..ba1189c25f94
--- /dev/null
+++ b/browser/components/enterprisepolicies/EnterprisePolicies.js
@@ -0,0 +1,358 @@
+/* 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 Ci = Components.interfaces;
+const Cc = Components.classes;
+const Cr = Components.results;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/AppConstants.jsm");
+
+XPCOMUtils.defineLazyModuleGetters(this, {
+  NetUtil: "resource://gre/modules/NetUtil.jsm",
+  Policies: "resource:///modules/policies/Policies.jsm",
+  PoliciesValidator: "resource:///modules/policies/PoliciesValidator.jsm",
+});
+
+// This is the file that will be searched for in the
+// ${InstallDir}/distribution folder.
+const POLICIES_FILENAME = "policies.json";
+
+// For easy testing, modify the helpers/sample.json file,
+// and set PREF_ALTERNATE_PATH in firefox.js as:
+// /your/repo/browser/components/enterprisepolicies/helpers/sample.json
+const PREF_ALTERNATE_PATH     = "browser.policies.alternatePath";
+
+// This pref is meant to be temporary: it will only be used while we're
+// testing this feature without rolling it out officially. When the
+// policy engine is released, this pref should be removed.
+const PREF_ENABLED            = "browser.policies.enabled";
+const PREF_LOGLEVEL           = "browser.policies.loglevel";
+
+XPCOMUtils.defineLazyGetter(this, "log", () => {
+  let { ConsoleAPI } = Cu.import("resource://gre/modules/Console.jsm", {});
+  return new ConsoleAPI({
+    prefix: "Enterprise Policies",
+    // tip: set maxLogLevel to "debug" and use log.debug() to create detailed
+    // messages during development. See LOG_LEVELS in Console.jsm for details.
+    maxLogLevel: "error",
+    maxLogLevelPref: PREF_LOGLEVEL,
+  });
+});
+
+// ==== Start XPCOM Boilerplate ==== \\
+
+// Factory object
+const EnterprisePoliciesFactory = {
+  _instance: null,
+  createInstance: function BGSF_createInstance(outer, iid) {
+    if (outer != null)
+      throw Components.results.NS_ERROR_NO_AGGREGATION;
+    return this._instance == null ?
+      this._instance = new EnterprisePoliciesManager() : this._instance;
+  }
+};
+
+// ==== End XPCOM Boilerplate ==== //
+
+// Constructor
+function EnterprisePoliciesManager() {
+  Services.obs.addObserver(this, "profile-after-change", true);
+  Services.obs.addObserver(this, "final-ui-startup", true);
+  Services.obs.addObserver(this, "sessionstore-windows-restored", true);
+  Services.obs.addObserver(this, "EnterprisePolicies:Restart", true);
+}
+
+EnterprisePoliciesManager.prototype = {
+  // for XPCOM
+  classID:          Components.ID("{ea4e1414-779b-458b-9d1f-d18e8efbc145}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver,
+                                         Ci.nsISupportsWeakReference,
+                                         Ci.nsIEnterprisePolicies]),
+
+  // redefine the default factory for XPCOMUtils
+  _xpcom_factory: EnterprisePoliciesFactory,
+
+  _initialize() {
+    if (!Services.prefs.getBoolPref(PREF_ENABLED, false)) {
+      this.status = Ci.nsIEnterprisePolicies.INACTIVE;
+      return;
+    }
+
+    this._file = new JSONFileReader(getConfigurationFile());
+    this._file.readData();
+
+    if (!this._file.exists) {
+      this.status = Ci.nsIEnterprisePolicies.INACTIVE;
+      return;
+    }
+
+    if (this._file.failed) {
+      this.status = Ci.nsIEnterprisePolicies.FAILED;
+      return;
+    }
+
+    this.status = Ci.nsIEnterprisePolicies.ACTIVE;
+    this._activatePolicies();
+  },
+
+  _activatePolicies() {
+    let { schema } = Cu.import("resource:///modules/policies/schema.jsm", {});
+    let json = this._file.json;
+
+    for (let policyName of Object.keys(json.policies)) {
+      let policySchema = schema.properties[policyName];
+      let policyParameters = json.policies[policyName];
+
+      if (!policySchema) {
+        log.error(`Unknown policy: ${policyName}`);
+        continue;
+      }
+
+      let [parametersAreValid, parsedParameters] =
+        PoliciesValidator.validateAndParseParameters(policyParameters,
+                                                     policySchema);
+
+      if (!parametersAreValid) {
+        log.error(`Invalid parameters specified for ${policyName}.`);
+        continue;
+      }
+
+      let policyImpl = Policies[policyName];
+
+      for (let timing of Object.keys(this._callbacks)) {
+        let policyCallback = policyImpl["on" + timing];
+        if (policyCallback) {
+          this._schedulePolicyCallback(
+            timing,
+            policyCallback.bind(null,
+                                this, /* the EnterprisePoliciesManager */
+                                parsedParameters));
+        }
+      }
+    }
+  },
+
+  _callbacks: {
+    BeforeAddons: [],
+    ProfileAfterChange: [],
+    BeforeUIStartup: [],
+    AllWindowsRestored: [],
+  },
+
+  _schedulePolicyCallback(timing, callback) {
+    this._callbacks[timing].push(callback);
+  },
+
+  _runPoliciesCallbacks(timing) {
+    let callbacks = this._callbacks[timing];
+    while (callbacks.length > 0) {
+      let callback = callbacks.shift();
+      try {
+        callback();
+      } catch (ex) {
+        log.error("Error running ", callback, `for ${timing}:`, ex);
+      }
+    }
+  },
+
+  async _restart() {
+    if (!Cu.isInAutomation) {
+      return;
+    }
+
+    DisallowedFeatures = {};
+
+    this._status = Ci.nsIEnterprisePolicies.UNINITIALIZED;
+    for (let timing of Object.keys(this._callbacks)) {
+      this._callbacks[timing] = [];
+    }
+    delete Services.ppmm.initialProcessData.policies;
+    Services.ppmm.broadcastAsyncMessage("EnterprisePolicies:Restart", null);
+
+    let { PromiseUtils } = Cu.import("resource://gre/modules/PromiseUtils.jsm",
+                                     {});
+
+    // Simulate the startup process. This step-by-step is a bit ugly but it
+    // tries to emulate the same behavior as of a normal startup.
+
+    await PromiseUtils.idleDispatch(() => {
+      this.observe(null, "policies-startup", null);
+    });
+
+    await PromiseUtils.idleDispatch(() => {
+      this.observe(null, "profile-after-change", null);
+    });
+
+    await PromiseUtils.idleDispatch(() => {
+      this.observe(null, "final-ui-startup", null);
+    });
+
+    await PromiseUtils.idleDispatch(() => {
+      this.observe(null, "sessionstore-windows-restored", null);
+    });
+  },
+
+  // nsIObserver implementation
+  observe: function BG_observe(subject, topic, data) {
+    switch (topic) {
+      case "policies-startup":
+        this._initialize();
+        this._runPoliciesCallbacks("BeforeAddons");
+        break;
+
+      case "profile-after-change":
+        // Before the first set of policy callbacks runs, we must
+        // initialize the service.
+        this._runPoliciesCallbacks("ProfileAfterChange");
+        break;
+
+      case "final-ui-startup":
+        this._runPoliciesCallbacks("BeforeUIStartup");
+        break;
+
+      case "sessionstore-windows-restored":
+        this._runPoliciesCallbacks("AllWindowsRestored");
+
+        // After the last set of policy callbacks ran, notify the test observer.
+        Services.obs.notifyObservers(null,
+                                     "EnterprisePolicies:AllPoliciesApplied");
+        break;
+
+      case "EnterprisePolicies:Restart":
+        this._restart().then(null, Cu.reportError);
+        break;
+    }
+  },
+
+  disallowFeature(feature, neededOnContentProcess = false) {
+    DisallowedFeatures[feature] = true;
+
+    // NOTE: For optimization purposes, only features marked as needed
+    // on content process will be passed onto the child processes.
+    if (neededOnContentProcess) {
+      Services.ppmm.initialProcessData.policies
+                                      .disallowedFeatures.push(feature);
+
+      if (Services.ppmm.childCount > 1) {
+        // If there has been a content process already initialized, let's
+        // broadcast the newly disallowed feature.
+        Services.ppmm.broadcastAsyncMessage(
+          "EnterprisePolicies:DisallowFeature", {feature}
+        );
+      }
+    }
+  },
+
+  // ------------------------------
+  // public nsIEnterprisePolicies members
+  // ------------------------------
+
+  _status: Ci.nsIEnterprisePolicies.UNINITIALIZED,
+
+  set status(val) {
+    this._status = val;
+    if (val != Ci.nsIEnterprisePolicies.INACTIVE) {
+      Services.ppmm.initialProcessData.policies = {
+        status: val,
+        disallowedFeatures: [],
+      };
+    }
+    return val;
+  },
+
+  get status() {
+    return this._status;
+  },
+
+  isAllowed: function BG_sanitize(feature) {
+    return !(feature in DisallowedFeatures);
+  },
+};
+
+let DisallowedFeatures = {};
+
+function JSONFileReader(file) {
+  this._file = file;
+  this._data = {
+    exists: null,
+    failed: false,
+    json: null,
+  };
+}
+
+JSONFileReader.prototype = {
+  get exists() {
+    if (this._data.exists === null) {
+      this.readData();
+    }
+
+    return this._data.exists;
+  },
+
+  get failed() {
+    return this._data.failed;
+  },
+
+  get json() {
+    if (this._data.failed) {
+      return null;
+    }
+
+    if (this._data.json === null) {
+      this.readData();
+    }
+
+    return this._data.json;
+  },
+
+  readData() {
+    try {
+      let data = Cu.readUTF8File(this._file);
+      if (data) {
+        this._data.exists = true;
+        this._data.json = JSON.parse(data);
+      } else {
+        this._data.exists = false;
+      }
+    } catch (ex) {
+      if (ex instanceof Components.Exception &&
+          ex.result == Cr.NS_ERROR_FILE_NOT_FOUND) {
+        this._data.exists = false;
+      } else if (ex instanceof SyntaxError) {
+        log.error("Error parsing JSON file");
+        this._data.failed = true;
+      } else {
+        log.error("Error reading file");
+        this._data.failed = true;
+      }
+    }
+  }
+};
+
+function getConfigurationFile() {
+  let configFile = Services.dirsvc.get("XREAppDist", Ci.nsIFile);
+  configFile.append(POLICIES_FILENAME);
+
+  let prefType = Services.prefs.getPrefType(PREF_ALTERNATE_PATH);
+
+  if ((prefType == Services.prefs.PREF_STRING) && !configFile.exists()) {
+    // We only want to use the alternate file path if the file on the install
+    // folder doesn't exist. Otherwise it'd be possible for a user to override
+    // the admin-provided policies by changing the user-controlled prefs.
+    // This pref is only meant for tests, so it's fine to use this extra
+    // synchronous configFile.exists() above.
+    configFile = Cc["@mozilla.org/file/local;1"]
+                   .createInstance(Ci.nsIFile);
+    let alternatePath = Services.prefs.getStringPref(PREF_ALTERNATE_PATH);
+    configFile.initWithPath(alternatePath);
+  }
+
+  return configFile;
+}
+
+var components = [EnterprisePoliciesManager];
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory(components);
diff --git a/browser/components/enterprisepolicies/EnterprisePolicies.manifest b/browser/components/enterprisepolicies/EnterprisePolicies.manifest
new file mode 100644
index 000000000000..571ae1362996
--- /dev/null
+++ b/browser/components/enterprisepolicies/EnterprisePolicies.manifest
@@ -0,0 +1,5 @@
+component {ea4e1414-779b-458b-9d1f-d18e8efbc145} EnterprisePolicies.js process=main
+contract @mozilla.org/browser/enterprisepolicies;1 {ea4e1414-779b-458b-9d1f-d18e8efbc145} process=main
+
+component {dc6358f8-d167-4566-bf5b-4350b5e6a7a2} EnterprisePoliciesContent.js process=content
+contract @mozilla.org/browser/enterprisepolicies;1 {dc6358f8-d167-4566-bf5b-4350b5e6a7a2} process=content
diff --git a/browser/components/enterprisepolicies/EnterprisePoliciesContent.js b/browser/components/enterprisepolicies/EnterprisePoliciesContent.js
new file mode 100644
index 000000000000..bc9bda2f8c13
--- /dev/null
+++ b/browser/components/enterprisepolicies/EnterprisePoliciesContent.js
@@ -0,0 +1,91 @@
+/* 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 Ci = Components.interfaces;
+const Cc = Components.classes;
+const Cr = Components.results;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+const PREF_LOGLEVEL           = "browser.policies.loglevel";
+
+XPCOMUtils.defineLazyGetter(this, "log", () => {
+  let { ConsoleAPI } = Cu.import("resource://gre/modules/Console.jsm", {});
+  return new ConsoleAPI({
+    prefix: "Enterprise Policies Child",
+    // tip: set maxLogLevel to "debug" and use log.debug() to create detailed
+    // messages during development. See LOG_LEVELS in Console.jsm for details.
+    maxLogLevel: "error",
+    maxLogLevelPref: PREF_LOGLEVEL,
+  });
+});
+
+
+// ==== Start XPCOM Boilerplate ==== \\
+
+// Factory object
+const EnterprisePoliciesFactory = {
+  _instance: null,
+  createInstance: function BGSF_createInstance(outer, iid) {
+    if (outer != null)
+      throw Components.results.NS_ERROR_NO_AGGREGATION;
+    return this._instance == null ?
+      this._instance = new EnterprisePoliciesManagerContent() : this._instance;
+  }
+};
+
+// ==== End XPCOM Boilerplate ==== //
+
+
+function EnterprisePoliciesManagerContent() {
+  let policies = Services.cpmm.initialProcessData.policies;
+  if (policies) {
+    this._status = policies.status;
+    // make a copy of the array so that we can keep adding to it
+    // in a way that is not confusing.
+    this._disallowedFeatures = policies.disallowedFeatures.slice();
+  }
+
+  Services.cpmm.addMessageListener("EnterprisePolicies:DisallowFeature", this);
+  Services.cpmm.addMessageListener("EnterprisePolicies:Restart", this);
+}
+
+EnterprisePoliciesManagerContent.prototype = {
+  // for XPCOM
+  classID:          Components.ID("{dc6358f8-d167-4566-bf5b-4350b5e6a7a2}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIMessageListener,
+                                         Ci.nsIEnterprisePolicies]),
+
+  // redefine the default factory for XPCOMUtils
+  _xpcom_factory: EnterprisePoliciesFactory,
+
+  _status: Ci.nsIEnterprisePolicies.INACTIVE,
+
+  _disallowedFeatures: [],
+
+  receiveMessage({name, data}) {
+    switch (name) {
+      case "EnterprisePolicies:DisallowFeature":
+        this._disallowedFeatures.push(data.feature);
+        break;
+
+      case "EnterprisePolicies:Restart":
+        this._disallowedFeatures = [];
+        break;
+    }
+  },
+
+  get status() {
+    return this._status;
+  },
+
+  isAllowed(feature) {
+    return !this._disallowedFeatures.includes(feature);
+  }
+};
+
+var components = [EnterprisePoliciesManagerContent];
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory(components);
diff --git a/browser/components/enterprisepolicies/Policies.jsm b/browser/components/enterprisepolicies/Policies.jsm
new file mode 100644
index 000000000000..ab1531bbf322
--- /dev/null
+++ b/browser/components/enterprisepolicies/Policies.jsm
@@ -0,0 +1,38 @@
+/* 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 Ci = Components.interfaces;
+const Cc = Components.classes;
+const Cr = Components.results;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+const PREF_LOGLEVEL           = "browser.policies.loglevel";
+
+XPCOMUtils.defineLazyGetter(this, "log", () => {
+  let { ConsoleAPI } = Cu.import("resource://gre/modules/Console.jsm", {});
+  return new ConsoleAPI({
+    prefix: "Policies.jsm",
+    // tip: set maxLogLevel to "debug" and use log.debug() to create detailed
+    // messages during development. See LOG_LEVELS in Console.jsm for details.
+    maxLogLevel: "error",
+    maxLogLevelPref: PREF_LOGLEVEL,
+  });
+});
+
+this.EXPORTED_SYMBOLS = ["Policies"];
+
+this.Policies = {
+  "block_about_config": {
+    onBeforeUIStartup(manager, param) {
+      if (param == true) {
+        manager.disallowFeature("about:config", true);
+      }
+    }
+  },
+};
diff --git a/browser/components/enterprisepolicies/PoliciesValidator.jsm b/browser/components/enterprisepolicies/PoliciesValidator.jsm
new file mode 100644
index 000000000000..cfbb20f6e3b0
--- /dev/null
+++ b/browser/components/enterprisepolicies/PoliciesValidator.jsm
@@ -0,0 +1,148 @@
+/* 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 Ci = Components.interfaces;
+const Cc = Components.classes;
+const Cr = Components.results;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+
+const PREF_LOGLEVEL           = "browser.policies.loglevel";
+
+XPCOMUtils.defineLazyGetter(this, "log", () => {
+  let { ConsoleAPI } = Cu.import("resource://gre/modules/Console.jsm", {});
+  return new ConsoleAPI({
+    prefix: "PoliciesValidator.jsm",
+    // tip: set maxLogLevel to "debug" and use log.debug() to create detailed
+    // messages during development. See LOG_LEVELS in Console.jsm for details.
+    maxLogLevel: "error",
+    maxLogLevelPref: PREF_LOGLEVEL,
+  });
+});
+
+this.EXPORTED_SYMBOLS = ["PoliciesValidator"];
+
+this.PoliciesValidator = {
+  validateAndParseParameters(param, properties) {
+    return validateAndParseParamRecursive(param, properties);
+  }
+};
+
+function validateAndParseParamRecursive(param, properties) {
+  if (properties.enum) {
+    if (properties.enum.includes(param)) {
+      return [true, param];
+    }
+    return [false, null];
+  }
+
+  log.debug(`checking @${param}@ for type ${properties.type}`);
+  switch (properties.type) {
+    case "boolean":
+    case "number":
+    case "integer":
+    case "string":
+    case "URL":
+    case "origin":
+      return validateAndParseSimpleParam(param, properties.type);
+
+    case "array":
+      if (!Array.isArray(param)) {
+        log.error("Array expected but not received");
+        return [false, null];
+      }
+
+      let parsedArray = [];
+      for (let item of param) {
+        log.debug(`in array, checking @${item}@ for type ${properties.items.type}`);
+        let [valid, parsedValue] = validateAndParseParamRecursive(item, properties.items);
+        if (!valid) {
+          return [false, null];
+        }
+
+        parsedArray.push(parsedValue);
+      }
+
+      return [true, parsedArray];
+
+    case "object": {
+      if (typeof(param) != "object") {
+        log.error("Object expected but not received");
+        return [false, null];
+      }
+
+      let parsedObj = {};
+      for (let property of Object.keys(properties.properties)) {
+        log.debug(`in object, for property ${property} checking @${param[property]}@ for type ${properties.properties[property].type}`);
+        let [valid, parsedValue] = validateAndParseParamRecursive(param[property], properties.properties[property]);
+        if (!valid) {
+          return [false, null];
+        }
+
+        parsedObj[property] = parsedValue;
+      }
+
+      return [true, parsedObj];
+    }
+  }
+
+  return [false, null];
+}
+
+function validateAndParseSimpleParam(param, type) {
+  let valid = false;
+  let parsedParam = param;
+
+  switch (type) {
+    case "boolean":
+    case "number":
+    case "string":
+      valid = (typeof(param) == type);
+      break;
+
+    // integer is an alias to "number" that some JSON schema tools use
+    case "integer":
+      valid = (typeof(param) == "number");
+      break;
+
+    case "origin":
+      if (typeof(param) != "string") {
+        break;
+      }
+
+      try {
+        parsedParam = Services.io.newURI(param);
+
+        let pathQueryRef = parsedParam.pathQueryRef;
+        // Make sure that "origin" types won't accept full URLs.
+        if (pathQueryRef != "/" && pathQueryRef != "") {
+          valid = false;
+        } else {
+          valid = true;
+        }
+      } catch (ex) {
+        valid = false;
+      }
+      break;
+
+    case "URL":
+      if (typeof(param) != "string") {
+        break;
+      }
+
+      try {
+        parsedParam = Services.io.newURI(param);
+        valid = true;
+      } catch (ex) {
+        valid = false;
+      }
+      break;
+  }
+
+  return [valid, parsedParam];
+}
diff --git a/browser/components/enterprisepolicies/helpers/moz.build b/browser/components/enterprisepolicies/helpers/moz.build
new file mode 100644
index 000000000000..560d837fc699
--- /dev/null
+++ b/browser/components/enterprisepolicies/helpers/moz.build
@@ -0,0 +1,8 @@
+# -*- 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", "Enterprise Policies")
diff --git a/browser/components/enterprisepolicies/helpers/sample.json b/browser/components/enterprisepolicies/helpers/sample.json
new file mode 100644
index 000000000000..ab503c3ffe4b
--- /dev/null
+++ b/browser/components/enterprisepolicies/helpers/sample.json
@@ -0,0 +1,18 @@
+{
+  "policies": {
+    "block_about_config": true,
+    "dont_check_default_browser": true,
+
+    "flash_plugin": {
+      "allow": [
+        "https://www.example.com"
+      ],
+
+      "block": [
+        "https://www.example.org"
+      ]
+    },
+
+    "block_about_profiles": true
+  }
+}
diff --git a/browser/components/enterprisepolicies/moz.build b/browser/components/enterprisepolicies/moz.build
new file mode 100644
index 000000000000..b4cea960f5b0
--- /dev/null
+++ b/browser/components/enterprisepolicies/moz.build
@@ -0,0 +1,30 @@
+# -*- 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", "Enterprise Policies")
+
+DIRS += [
+    'helpers',
+    'schemas',
+]
+
+TEST_DIRS += [
+	'tests'
+]
+
+EXTRA_COMPONENTS += [
+    'EnterprisePolicies.js',
+    'EnterprisePolicies.manifest',
+    'EnterprisePoliciesContent.js',
+]
+
+EXTRA_JS_MODULES.policies += [
+    'Policies.jsm',
+    'PoliciesValidator.jsm',
+]
+
+FINAL_LIBRARY = 'browsercomps'
diff --git a/browser/components/enterprisepolicies/schemas/configuration.json b/browser/components/enterprisepolicies/schemas/configuration.json
new file mode 100644
index 000000000000..8d3e9e43c25c
--- /dev/null
+++ b/browser/components/enterprisepolicies/schemas/configuration.json
@@ -0,0 +1,10 @@
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
+  "properties": {
+    "policies": {
+      "$ref": "policies.json"
+    }
+  },
+  "required": ["policies"]
+}
diff --git a/browser/components/enterprisepolicies/schemas/moz.build b/browser/components/enterprisepolicies/schemas/moz.build
new file mode 100644
index 000000000000..54c07f173169
--- /dev/null
+++ b/browser/components/enterprisepolicies/schemas/moz.build
@@ -0,0 +1,12 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+with Files("**"):
+    BUG_COMPONENT = ("Firefox", "Enterprise Policies")
+
+EXTRA_PP_JS_MODULES.policies += [
+    'schema.jsm',
+]
diff --git a/browser/components/enterprisepolicies/schemas/policies-schema.json b/browser/components/enterprisepolicies/schemas/policies-schema.json
new file mode 100644
index 000000000000..c0257dd93fd6
--- /dev/null
+++ b/browser/components/enterprisepolicies/schemas/policies-schema.json
@@ -0,0 +1,13 @@
+{
+  "$schema": "http://json-schema.org/draft-04/schema#",
+  "type": "object",
+  "properties": {
+     "block_about_config": {
+      "description": "Blocks access to the about:config page.",
+      "first_available": "60.0",
+
+      "type": "boolean",
+      "enum": [true]
+    }
+  }
+}
diff --git a/browser/components/enterprisepolicies/schemas/schema.jsm b/browser/components/enterprisepolicies/schemas/schema.jsm
new file mode 100644
index 000000000000..3624bfd0344c
--- /dev/null
+++ b/browser/components/enterprisepolicies/schemas/schema.jsm
@@ -0,0 +1,10 @@
+/* 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";
+
+this.EXPORTED_SYMBOLS = ["schema"];
+
+this.schema =
+#include policies-schema.json
diff --git a/browser/components/enterprisepolicies/tests/browser/.eslintrc.js b/browser/components/enterprisepolicies/tests/browser/.eslintrc.js
new file mode 100644
index 000000000000..b1c842d8a6db
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/.eslintrc.js
@@ -0,0 +1,7 @@
+"use strict";
+
+module.exports = {
+  "extends": [
+    "plugin:mozilla/browser-test"
+  ]
+};
diff --git a/browser/components/enterprisepolicies/tests/browser/browser.ini b/browser/components/enterprisepolicies/tests/browser/browser.ini
new file mode 100644
index 000000000000..28ef70bff8b9
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/browser.ini
@@ -0,0 +1,11 @@
+[DEFAULT]
+prefs =
+  browser.policies.enabled=true
+support-files =
+  head.js
+  config_simple_policies.json
+  config_broken_json.json
+
+[browser_policies_broken_json.js]
+[browser_policies_simple_policies.js]
+[browser_policies_validate_and_parse_API.js]
diff --git a/browser/components/enterprisepolicies/tests/browser/browser_policies_broken_json.js b/browser/components/enterprisepolicies/tests/browser/browser_policies_broken_json.js
new file mode 100644
index 000000000000..7d1f5d6f3c68
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/browser_policies_broken_json.js
@@ -0,0 +1,15 @@
+/* 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";
+
+add_task(async function test_clean_slate() {
+  await startWithCleanSlate();
+});
+
+add_task(async function test_broken_json() {
+  await setupPolicyEngineWithJson("config_broken_json.json");
+
+  is(Services.policies.status, Ci.nsIEnterprisePolicies.FAILED, "Engine was correctly set to the error state");
+});
diff --git a/browser/components/enterprisepolicies/tests/browser/browser_policies_simple_policies.js b/browser/components/enterprisepolicies/tests/browser/browser_policies_simple_policies.js
new file mode 100644
index 000000000000..55f368c2fff6
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/browser_policies_simple_policies.js
@@ -0,0 +1,101 @@
+/* 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";
+
+add_task(async function test_clean_slate() {
+  await startWithCleanSlate();
+});
+
+add_task(async function test_simple_policies() {
+  await ContentTask.spawn(gBrowser.selectedBrowser, null, async function() {
+    // Initialize the service in the content process, in case it hasn't
+    // already started.
+    Services.policies;
+  });
+
+  let { Policies } = Cu.import("resource:///modules/policies/Policies.jsm", {});
+
+  let policy0Ran = false, policy1Ran = false, policy2Ran = false, policy3Ran = false;
+
+  // Implement functions to handle the four simple policies that will be added
+  // to the schema.
+  Policies.simple_policy0 = {
+    onProfileAfterChange(manager, param) {
+      is(param, true, "Param matches what was passed in config file");
+      policy0Ran = true;
+    }
+  };
+
+  Policies.simple_policy1 = {
+    onProfileAfterChange(manager, param) {
+      is(param, true, "Param matches what was passed in config file");
+      manager.disallowFeature("feature1", /* needed in content process */ true);
+      policy1Ran = true;
+    }
+  };
+
+  Policies.simple_policy2 = {
+    onBeforeUIStartup(manager, param) {
+      is(param, true, "Param matches what was passed in config file");
+      manager.disallowFeature("feature2", /* needed in content process */ false);
+      policy2Ran = true;
+    }
+  };
+
+  Policies.simple_policy3 = {
+    onAllWindowsRestored(manager, param) {
+      is(param, false, "Param matches what was passed in config file");
+      policy3Ran = true;
+    }
+  };
+
+  await setupPolicyEngineWithJson(
+    "config_simple_policies.json",
+    /* custom schema */
+    {
+      properties: {
+        "simple_policy0": {
+          "type": "boolean"
+        },
+
+        "simple_policy1": {
+          "type": "boolean"
+        },
+
+        "simple_policy2": {
+          "type": "boolean"
+        },
+
+        "simple_policy3": {
+          "type": "boolean"
+        }
+
+      }
+    }
+  );
+
+  is(Services.policies.status, Ci.nsIEnterprisePolicies.ACTIVE, "Engine is active");
+  is(Services.policies.isAllowed("feature1"), false, "Dummy feature was disallowed");
+  is(Services.policies.isAllowed("feature2"), false, "Dummy feature was disallowed");
+
+  ok(policy0Ran, "Policy 0 ran correctly through BeforeAddons");
+  ok(policy1Ran, "Policy 1 ran correctly through onProfileAfterChange");
+  ok(policy2Ran, "Policy 2 ran correctly through onBeforeUIStartup");
+  ok(policy3Ran, "Policy 3 ran correctly through onAllWindowsRestored");
+
+  await ContentTask.spawn(gBrowser.selectedBrowser, null, async function() {
+    if (Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT) {
+      is(Services.policies.isAllowed("feature1"), false, "Correctly disallowed in the content process");
+      // Feature 2 wasn't explictly marked as needed in the content process, so it is not marked
+      // as disallowed there.
+      is(Services.policies.isAllowed("feature2"), true, "Correctly missing in the content process");
+    }
+  });
+
+  delete Policies.simple_policy0;
+  delete Policies.simple_policy1;
+  delete Policies.simple_policy2;
+  delete Policies.simple_policy3;
+});
diff --git a/browser/components/enterprisepolicies/tests/browser/browser_policies_validate_and_parse_API.js b/browser/components/enterprisepolicies/tests/browser/browser_policies_validate_and_parse_API.js
new file mode 100644
index 000000000000..4dc81acc4b74
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/browser_policies_validate_and_parse_API.js
@@ -0,0 +1,231 @@
+/* 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";
+
+/* This file will test the parameters parsing and validation directly through
+   the PoliciesValidator API.
+ */
+
+const { PoliciesValidator } = Cu.import("resource:///modules/policies/PoliciesValidator.jsm", {});
+
+add_task(async function test_boolean_values() {
+  let schema = {
+    type: "boolean"
+  };
+
+  let valid, parsed;
+  [valid, parsed] = PoliciesValidator.validateAndParseParameters(true, schema);
+  ok(valid && parsed === true, "Parsed boolean value correctly");
+
+  [valid, parsed] = PoliciesValidator.validateAndParseParameters(false, schema);
+  ok(valid && parsed === false, "Parsed boolean value correctly");
+
+  // Invalid values:
+  ok(!PoliciesValidator.validateAndParseParameters("0", schema)[0], "No type coercion");
+  ok(!PoliciesValidator.validateAndParseParameters("true", schema)[0], "No type coercion");
+  ok(!PoliciesValidator.validateAndParseParameters(undefined, schema)[0], "Invalid value");
+  ok(!PoliciesValidator.validateAndParseParameters({}, schema)[0], "Invalid value");
+  ok(!PoliciesValidator.validateAndParseParameters(null, schema)[0], "Invalid value");
+});
+
+add_task(async function test_number_values() {
+  let schema = {
+    type: "number"
+  };
+
+  let valid, parsed;
+  [valid, parsed] = PoliciesValidator.validateAndParseParameters(1, schema);
+  ok(valid && parsed === 1, "Parsed number value correctly");
+
+  // Invalid values:
+  ok(!PoliciesValidator.validateAndParseParameters("1", schema)[0], "No type coercion");
+  ok(!PoliciesValidator.validateAndParseParameters(true, schema)[0], "Invalid value");
+  ok(!PoliciesValidator.validateAndParseParameters({}, schema)[0], "Invalid value");
+  ok(!PoliciesValidator.validateAndParseParameters(null, schema)[0], "Invalid value");
+});
+
+add_task(async function test_integer_values() {
+  // Integer is an alias for number
+  let schema = {
+    type: "integer"
+  };
+
+  let valid, parsed;
+  [valid, parsed] = PoliciesValidator.validateAndParseParameters(1, schema);
+  ok(valid && parsed == 1, "Parsed integer value correctly");
+
+  // Invalid values:
+  ok(!PoliciesValidator.validateAndParseParameters("1", schema)[0], "No type coercion");
+  ok(!PoliciesValidator.validateAndParseParameters(true, schema)[0], "Invalid value");
+  ok(!PoliciesValidator.validateAndParseParameters({}, schema)[0], "Invalid value");
+  ok(!PoliciesValidator.validateAndParseParameters(null, schema)[0], "Invalid value");
+});
+
+add_task(async function test_string_values() {
+  let schema = {
+    type: "string"
+  };
+
+  let valid, parsed;
+  [valid, parsed] = PoliciesValidator.validateAndParseParameters("foobar", schema);
+  ok(valid && parsed == "foobar", "Parsed string value correctly");
+
+  // Invalid values:
+  ok(!PoliciesValidator.validateAndParseParameters(1, schema)[0], "No type coercion");
+  ok(!PoliciesValidator.validateAndParseParameters(true, schema)[0], "No type coercion");
+  ok(!PoliciesValidator.validateAndParseParameters(undefined, schema)[0], "Invalid value");
+  ok(!PoliciesValidator.validateAndParseParameters({}, schema)[0], "Invalid value");
+  ok(!PoliciesValidator.validateAndParseParameters(null, schema)[0], "Invalid value");
+});
+
+add_task(async function test_URL_values() {
+  let schema = {
+    type: "URL"
+  };
+
+  let valid, parsed;
+  [valid, parsed] = PoliciesValidator.validateAndParseParameters("https://www.example.com/foo#bar", schema);
+  ok(valid, "URL is valid");
+  ok(parsed instanceof Ci.nsIURI, "parsed is a nsIURI");
+  is(parsed.prePath, "https://www.example.com", "prePath is correct");
+  is(parsed.pathQueryRef, "/foo#bar", "pathQueryRef is correct");
+
+  // Invalid values:
+  ok(!PoliciesValidator.validateAndParseParameters("www.example.com", schema)[0], "Scheme is required for URL");
+  ok(!PoliciesValidator.validateAndParseParameters("https://:!$%", schema)[0], "Invalid URL");
+  ok(!PoliciesValidator.validateAndParseParameters({}, schema)[0], "Invalid value");
+});
+
+add_task(async function test_origin_values() {
+  // Origin is a URL that doesn't contain a path/query string (i.e., it's only scheme + host + port)
+  let schema = {
+    type: "origin"
+  };
+
+  let valid, parsed;
+  [valid, parsed] = PoliciesValidator.validateAndParseParameters("https://www.example.com", schema);
+  ok(valid, "Origin is valid");
+  ok(parsed instanceof Ci.nsIURI, "parsed is a nsIURI");
+  is(parsed.prePath, "https://www.example.com", "prePath is correct");
+  is(parsed.pathQueryRef, "/", "pathQueryRef is corect");
+
+  // Invalid values:
+  ok(!PoliciesValidator.validateAndParseParameters("https://www.example.com/foobar", schema)[0], "Origin cannot contain a path part");
+  ok(!PoliciesValidator.validateAndParseParameters("https://:!$%", schema)[0], "Invalid origin");
+  ok(!PoliciesValidator.validateAndParseParameters({}, schema)[0], "Invalid value");
+});
+
+add_task(async function test_array_values() {
+  // The types inside an array object must all be the same
+  let schema = {
+    type: "array",
+    items: {
+      type: "number"
+    }
+  };
+
+  let valid, parsed;
+  [valid, parsed] = PoliciesValidator.validateAndParseParameters([1, 2, 3], schema);
+  ok(valid, "Array is valid");
+  ok(Array.isArray(parsed), "parsed is an array");
+  is(parsed.length, 3, "array is correct");
+
+  // An empty array is also valid
+  [valid, parsed] = PoliciesValidator.validateAndParseParameters([], schema);
+  ok(valid, "Array is valid");
+  ok(Array.isArray(parsed), "parsed is an array");
+  is(parsed.length, 0, "array is correct");
+
+  // Invalid values:
+  ok(!PoliciesValidator.validateAndParseParameters([1, true, 3], schema)[0], "Mixed types");
+  ok(!PoliciesValidator.validateAndParseParameters(2, schema)[0], "Type is correct but not in an array");
+  ok(!PoliciesValidator.validateAndParseParameters({}, schema)[0], "Object is not an array");
+});
+
+add_task(async function test_object_values() {
+  let schema = {
+    type: "object",
+    properties: {
+      url: {
+        type: "URL"
+      },
+      title: {
+        type: "string"
+      }
+    }
+  };
+
+  let valid, parsed;
+  [valid, parsed] = PoliciesValidator.validateAndParseParameters(
+    {
+      url: "https://www.example.com/foo#bar",
+      title: "Foo",
+      alias: "Bar"
+    },
+    schema);
+
+  ok(valid, "Object is valid");
+  ok(typeof(parsed) == "object", "parsed in an object");
+  ok(parsed.url instanceof Ci.nsIURI, "types inside the object are also parsed");
+  is(parsed.url.spec, "https://www.example.com/foo#bar", "URL was correctly parsed");
+  is(parsed.title, "Foo", "title was correctly parsed");
+  is(parsed.alias, undefined, "property not described in the schema is not present in the parsed object");
+
+  // Invalid values:
+  ok(!PoliciesValidator.validateAndParseParameters(
+    {
+      url: "https://www.example.com/foo#bar",
+      title: 3,
+    },
+    schema)[0], "Mismatched type for title");
+
+  ok(!PoliciesValidator.validateAndParseParameters(
+    {
+      url: "www.example.com",
+      title: 3,
+    },
+    schema)[0], "Invalid URL inside the object");
+});
+
+add_task(async function test_array_of_objects() {
+  // This schema is used, for example, for bookmarks
+  let schema = {
+    type: "array",
+    items: {
+      type: "object",
+      properties: {
+        url: {
+          type: "URL",
+        },
+        title: {
+          type: "string"
+        }
+      }
+    }
+  };
+
+  let valid, parsed;
+  [valid, parsed] = PoliciesValidator.validateAndParseParameters(
+    [{
+      url: "https://www.example.com/bookmark1",
+      title: "Foo",
+    },
+    {
+      url: "https://www.example.com/bookmark2",
+      title: "Bar",
+    }],
+    schema);
+
+  ok(valid, "Array is valid");
+  is(parsed.length, 2, "Correct number of items");
+
+  ok(typeof(parsed[0]) == "object" && typeof(parsed[1]) == "object", "Correct objects inside array");
+
+  is(parsed[0].url.spec, "https://www.example.com/bookmark1", "Correct URL for bookmark 1");
+  is(parsed[1].url.spec, "https://www.example.com/bookmark2", "Correct URL for bookmark 2");
+
+  is(parsed[0].title, "Foo", "Correct title for bookmark 1");
+  is(parsed[1].title, "Bar", "Correct title for bookmark 2");
+});
diff --git a/browser/components/enterprisepolicies/tests/browser/config_broken_json.json b/browser/components/enterprisepolicies/tests/browser/config_broken_json.json
new file mode 100644
index 000000000000..7e13efdd8880
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/config_broken_json.json
@@ -0,0 +1,3 @@
+{
+  "policies
+}
diff --git a/browser/components/enterprisepolicies/tests/browser/config_simple_policies.json b/browser/components/enterprisepolicies/tests/browser/config_simple_policies.json
new file mode 100644
index 000000000000..0fc759605f79
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/config_simple_policies.json
@@ -0,0 +1,8 @@
+{
+  "policies": {
+    "simple_policy0": true,
+    "simple_policy1": true,
+    "simple_policy2": true,
+    "simple_policy3": false
+  }
+}
diff --git a/browser/components/enterprisepolicies/tests/browser/head.js b/browser/components/enterprisepolicies/tests/browser/head.js
new file mode 100644
index 000000000000..9bbfc485eeda
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/browser/head.js
@@ -0,0 +1,34 @@
+/* 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";
+
+async function setupPolicyEngineWithJson(jsonName, customSchema) {
+  let filePath = getTestFilePath(jsonName ? jsonName : "non-existing-file.json");
+  Services.prefs.setStringPref("browser.policies.alternatePath", filePath);
+
+  let resolve = null;
+  let promise = new Promise((r) => resolve = r);
+
+  Services.obs.addObserver(function observer() {
+    Services.obs.removeObserver(observer, "EnterprisePolicies:AllPoliciesApplied");
+    resolve();
+  }, "EnterprisePolicies:AllPoliciesApplied");
+
+  // Clear any previously used custom schema
+  Cu.unload("resource:///modules/policies/schema.jsm");
+
+  if (customSchema) {
+    let schemaModule = Cu.import("resource:///modules/policies/schema.jsm", {});
+    schemaModule.schema = customSchema;
+  }
+
+  Services.obs.notifyObservers(null, "EnterprisePolicies:Restart");
+  return promise;
+}
+
+async function startWithCleanSlate() {
+  await setupPolicyEngineWithJson("");
+  is(Services.policies.status, Ci.nsIEnterprisePolicies.INACTIVE, "Engine is inactive");
+}
diff --git a/browser/components/enterprisepolicies/tests/moz.build b/browser/components/enterprisepolicies/tests/moz.build
new file mode 100644
index 000000000000..9773431fcb3a
--- /dev/null
+++ b/browser/components/enterprisepolicies/tests/moz.build
@@ -0,0 +1,12 @@
+# -*- 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", "General")
+
+BROWSER_CHROME_MANIFESTS += [
+    'browser/browser.ini'
+]
diff --git a/browser/components/moz.build b/browser/components/moz.build
index f92c4b3439e7..aed15a4c98f4 100644
--- a/browser/components/moz.build
+++ b/browser/components/moz.build
@@ -38,6 +38,7 @@ DIRS += [
     'customizableui',
     'dirprovider',
     'downloads',
+    'enterprisepolicies',
     'extensions',
     'feeds',
     'migration',
diff --git a/browser/installer/package-manifest.in b/browser/installer/package-manifest.in
index b215cada67ce..d88d22784e4a 100644
--- a/browser/installer/package-manifest.in
+++ b/browser/installer/package-manifest.in
@@ -229,6 +229,7 @@
 @RESPATH@/components/dom_presentation.xpt
 @RESPATH@/components/downloads.xpt
 @RESPATH@/components/editor.xpt
+@RESPATH@/components/enterprisepolicies.xpt
 @RESPATH@/components/extensions.xpt
 @RESPATH@/components/exthandler.xpt
 @RESPATH@/components/fastfind.xpt
@@ -379,6 +380,9 @@
 @RESPATH@/browser/components/browser-newtab.xpt
 @RESPATH@/browser/components/aboutNewTabService.js
 @RESPATH@/browser/components/NewTabComponents.manifest
+@RESPATH@/browser/components/EnterprisePolicies.js
+@RESPATH@/browser/components/EnterprisePoliciesContent.js
+@RESPATH@/browser/components/EnterprisePolicies.manifest
 @RESPATH@/components/Downloads.manifest
 @RESPATH@/components/DownloadLegacy.js
 @RESPATH@/components/thumbnails.xpt
diff --git a/toolkit/components/enterprisepolicies/moz.build b/toolkit/components/enterprisepolicies/moz.build
new file mode 100644
index 000000000000..87b64c8b046e
--- /dev/null
+++ b/toolkit/components/enterprisepolicies/moz.build
@@ -0,0 +1,14 @@
+# -*- 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", "Enterprise Policies")
+
+XPIDL_SOURCES += [
+    'nsIEnterprisePolicies.idl',
+]
+
+XPIDL_MODULE = 'enterprisepolicies'
diff --git a/toolkit/components/enterprisepolicies/nsIEnterprisePolicies.idl b/toolkit/components/enterprisepolicies/nsIEnterprisePolicies.idl
new file mode 100644
index 000000000000..58252c7bd5da
--- /dev/null
+++ b/toolkit/components/enterprisepolicies/nsIEnterprisePolicies.idl
@@ -0,0 +1,18 @@
+/* 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/. */
+
+#include "nsISupports.idl"
+
+[scriptable, uuid(6a568972-cc91-4bf5-963e-3768f3319b8a)]
+interface nsIEnterprisePolicies : nsISupports
+{
+  const unsigned short UNINITIALIZED = 0;
+  const unsigned short INACTIVE      = 1;
+  const unsigned short ACTIVE        = 2;
+  const unsigned short FAILED        = 3;
+
+  readonly attribute short status;
+
+  bool isAllowed(in ACString feature);
+};
diff --git a/toolkit/components/moz.build b/toolkit/components/moz.build
index 916c2b8dbcbd..3a800b463c2f 100644
--- a/toolkit/components/moz.build
+++ b/toolkit/components/moz.build
@@ -30,6 +30,7 @@ DIRS += [
     'crashmonitor',
     'diskspacewatcher',
     'downloads',
+    'enterprisepolicies',
     'extensions',
     'filewatcher',
     'finalizationwitness',
diff --git a/toolkit/modules/Services.jsm b/toolkit/modules/Services.jsm
index 23066384252d..60b53727a26f 100644
--- a/toolkit/modules/Services.jsm
+++ b/toolkit/modules/Services.jsm
@@ -122,6 +122,9 @@ if (AppConstants.MOZ_GECKO_PROFILER) {
 if (AppConstants.MOZ_TOOLKIT_SEARCH) {
   initTable.search = ["@mozilla.org/browser/search-service;1", "nsIBrowserSearchService"];
 }
+if (AppConstants.MOZ_BUILD_APP == "browser") {
+  initTable.policies = ["@mozilla.org/browser/enterprisepolicies;1", "nsIEnterprisePolicies"];
+}
 
 XPCOMUtils.defineLazyServiceGetters(Services, initTable);
 
diff --git a/toolkit/modules/tests/xpcshell/test_Services.js b/toolkit/modules/tests/xpcshell/test_Services.js
index 9601b81095e9..dc41f1ff9798 100644
--- a/toolkit/modules/tests/xpcshell/test_Services.js
+++ b/toolkit/modules/tests/xpcshell/test_Services.js
@@ -70,6 +70,10 @@ function run_test() {
   if ("nsIAndroidBridge" in Ci) {
     checkService("androidBridge", Ci.nsIAndroidBridge);
   }
+  if ("@mozilla.org/browser/enterprisepolicies;1" in Cc) {
+    checkService("policies", Ci.nsIEnterprisePolicies);
+  }
+
 
   // In xpcshell tests, the "@mozilla.org/xre/app-info;1" component implements
   // only the nsIXULRuntime interface, but not nsIXULAppInfo.  To test the
diff --git a/toolkit/xre/nsXREDirProvider.cpp b/toolkit/xre/nsXREDirProvider.cpp
index 84a3b78efecb..5705bd06d53e 100644
--- a/toolkit/xre/nsXREDirProvider.cpp
+++ b/toolkit/xre/nsXREDirProvider.cpp
@@ -1009,6 +1009,12 @@ nsXREDirProvider::DoStartup()
     static const char16_t kStartup[] = {'s','t','a','r','t','u','p','\0'};
     obsSvc->NotifyObservers(nullptr, "profile-do-change", kStartup);
 
+    // Initialize the Enterprise Policies service
+    nsCOMPtr<nsIObserver> policies(do_GetService("@mozilla.org/browser/enterprisepolicies;1"));
+    if (policies) {
+      policies->Observe(nullptr, "policies-startup", nullptr);
+    }
+
     // Init the Extension Manager
     nsCOMPtr<nsIObserver> em = do_GetService("@mozilla.org/addons/integration;1");
     if (em) {