browser/components/BrowserGlue.jsm
author Cosmin Sabou <csabou@mozilla.com>
Sat, 02 Mar 2019 20:40:01 +0200
changeset 462132 bf3cbcc825276823afba2778333cf62cfa75039c
parent 462023 443087a359f9baec6e41e9693adc32ad420c561c
child 462440 e2b8ea7e00d9ccb32e57775b343667bf833e50ab
permissions -rw-r--r--
Backed out 16 changesets (bug 827976) for causing bug 1532054. a=backout Backed out changeset 54c0b12443ed (bug 827976) Backed out changeset 92b45080d080 (bug 827976) Backed out changeset 443087a359f9 (bug 827976) Backed out changeset f976c2d4cebb (bug 827976) Backed out changeset 66cffb171024 (bug 827976) Backed out changeset 845e1d0b2402 (bug 827976) Backed out changeset fd94066a1d76 (bug 827976) Backed out changeset e253b264e7bd (bug 827976) Backed out changeset 07ef335770a8 (bug 827976) Backed out changeset 9d3805d77b99 (bug 827976) Backed out changeset eed600ceb606 (bug 827976) Backed out changeset 3b64368cff52 (bug 827976) Backed out changeset 69d0378e0c09 (bug 827976) Backed out changeset 9203871a5c6f (bug 827976) Backed out changeset 96a507c818e2 (bug 827976) Backed out changeset e254496ff95b (bug 827976)

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

var EXPORTED_SYMBOLS = ["BrowserGlue", "ContentPermissionPrompt"];

const XULNS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";

const {XPCOMUtils} = ChromeUtils.import("resource://gre/modules/XPCOMUtils.jsm");
const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");
const {AppConstants} = ChromeUtils.import("resource://gre/modules/AppConstants.jsm");

ChromeUtils.defineModuleGetter(this, "ActorManagerParent",
                               "resource://gre/modules/ActorManagerParent.jsm");

const PREF_PDFJS_ENABLED_CACHE_STATE = "pdfjs.enabledCache.state";

let ACTORS = {
  AboutReader: {
    child: {
      module: "resource:///actors/AboutReaderChild.jsm",
      group: "browsers",
      events: {
        "AboutReaderContentLoaded": {wantUntrusted: true},
        "DOMContentLoaded": {},
        "pageshow": {mozSystemGroup: true},
        "pagehide": {mozSystemGroup: true},
      },
      messages: [
        "Reader:ToggleReaderMode",
        "Reader:PushState",
      ],
    },
  },

  BlockedSite: {
    child: {
      module: "resource:///actors/BlockedSiteChild.jsm",
      events: {
        "AboutBlockedLoaded": {wantUntrusted: true},
        "click": {},
      },
      matches: ["about:blocked?*"],
      allFrames: true,
      messages: [
        "DeceptiveBlockedDetails",
      ],
    },
  },

  BrowserTab: {
    child: {
      module: "resource:///actors/BrowserTabChild.jsm",
      group: "browsers",

      events: {
        "DOMWindowCreated": {once: true},
        "MozAfterPaint": {once: true},
        "MozDOMPointerLock:Entered": {},
        "MozDOMPointerLock:Exited": {},
      },

      messages: [
        "AllowScriptsToClose",
        "Browser:AppTab",
        "Browser:HasSiblings",
        "Browser:Reload",
        "MixedContent:ReenableProtection",
        "SwitchDocumentDirection",
        "UpdateCharacterSet",
      ],
    },
  },

  ClickHandler: {
    child: {
      module: "resource:///actors/ClickHandlerChild.jsm",
      events: {
        "click": {capture: true, mozSystemGroup: true},
      },
    },
  },

  ContextMenu: {
    child: {
      module: "resource:///actors/ContextMenuChild.jsm",
      events: {
        "contextmenu": {mozSystemGroup: true},
      },
    },
  },

  ContentSearch: {
    child: {
      module: "resource:///actors/ContentSearchChild.jsm",
      group: "browsers",
      matches: ["about:home", "about:newtab", "about:welcome", "about:privatebrowsing",
                "chrome://mochitests/content/*"],
      events: {
        "ContentSearchClient": {capture: true, wantUntrusted: true},
      },
      messages: [
        "ContentSearch",
      ],
    },
  },

  DOMFullscreen: {
    child: {
      module: "resource:///actors/DOMFullscreenChild.jsm",
      group: "browsers",
      events: {
        "MozDOMFullscreen:Request": {},
        "MozDOMFullscreen:Entered": {},
        "MozDOMFullscreen:NewOrigin": {},
        "MozDOMFullscreen:Exit": {},
        "MozDOMFullscreen:Exited": {},
      },
      messages: [
        "DOMFullscreen:Entered",
        "DOMFullscreen:CleanUp",
      ],
    },
  },

  FormValidation: {
    child: {
      module: "resource:///actors/FormValidationChild.jsm",
      events: {
        "MozInvalidForm": {},
      },
    },
  },

  LightWeightThemeInstall: {
    child: {
      module: "resource:///actors/LightWeightThemeInstallChild.jsm",
      events: {
        "InstallBrowserTheme": {wantUntrusted: true},
        "PreviewBrowserTheme": {wantUntrusted: true},
        "ResetBrowserThemePreview": {wantUntrusted: true},
      },
    },
  },

  LightweightTheme: {
    child: {
      module: "resource:///actors/LightweightThemeChild.jsm",
      matches: ["about:home", "about:newtab", "about:welcome"],
      events: {
        "pageshow": {mozSystemGroup: true},
      },
    },
  },

  LinkHandler: {
    child: {
      module: "resource:///actors/LinkHandlerChild.jsm",
      events: {
        "DOMHeadElementParsed": {},
        "DOMLinkAdded": {},
        "DOMLinkChanged": {},
        "pageshow": {},
        "pagehide": {},
      },
    },
  },

  NetError: {
    child: {
      module: "resource:///actors/NetErrorChild.jsm",
      events: {
        "AboutNetErrorLoad": {wantUntrusted: true},
        "AboutNetErrorOpenCaptivePortal": {wantUntrusted: true},
        "AboutNetErrorSetAutomatic": {wantUntrusted: true},
        "AboutNetErrorResetPreferences": {wantUntrusted: true},
        "click": {},
      },
      matches: ["about:certerror?*", "about:neterror?*"],
      allFrames: true,
      messages: [
        "Browser:CaptivePortalFreed",
        "CertErrorDetails",
      ],
    },
  },

  OfflineApps: {
    child: {
      module: "resource:///actors/OfflineAppsChild.jsm",
      events: {
        "MozApplicationManifest": {},
      },
      messages: [
        "OfflineApps:StartFetching",
      ],
    },
  },

  PageInfo: {
    child: {
      module: "resource:///actors/PageInfoChild.jsm",
      messages: ["PageInfo:getData"],
    },
  },

  PageStyle: {
    child: {
      module: "resource:///actors/PageStyleChild.jsm",
      group: "browsers",
      events: {
        "pageshow": {},
      },
      messages: [
        "PageStyle:Switch",
        "PageStyle:Disable",
      ],
    },
  },

  Plugin: {
    child: {
      module: "resource:///actors/PluginChild.jsm",
      events: {
        "PluginBindingAttached": {capture: true, wantUntrusted: true},
        "PluginCrashed": {capture: true},
        "PluginOutdated": {capture: true},
        "PluginInstantiated": {capture: true},
        "PluginRemoved": {capture: true},
        "HiddenPlugin": {capture: true},
      },

      messages: [
        "BrowserPlugins:ActivatePlugins",
        "BrowserPlugins:ContextMenuCommand",
        "BrowserPlugins:NPAPIPluginProcessCrashed",
        "BrowserPlugins:CrashReportSubmitted",
        "BrowserPlugins:Test:ClearCrashData",
      ],

      observers: [
        "decoder-doctor-notification",
      ],
    },
  },

  RFPHelper: {
    child: {
      module: "resource:///actors/RFPHelperChild.jsm",
      group: "browsers",
      events: {
        "resize": {},
      },
    },
  },

  SearchTelemetry: {
    child: {
      module: "resource:///actors/SearchTelemetryChild.jsm",
      events: {
        DOMContentLoaded: {},
        "pageshow": {mozSystemGroup: true},
      },
    },
  },

  ShieldFrame: {
    child: {
      module: "resource://normandy-content/ShieldFrameChild.jsm",
      events: {
        "ShieldPageEvent": {wantUntrusted: true},
      },
      matches: ["about:studies"],
    },
  },

  UITour: {
    child: {
      module: "resource:///modules/UITourChild.jsm",
      events: {
        "mozUITour": {wantUntrusted: true},
      },
      permissions: ["uitour"],
    },
  },

  URIFixup: {
    child: {
      module: "resource:///actors/URIFixupChild.jsm",
      group: "browsers",
      observers: ["keyword-uri-fixup"],
    },
  },

  WebRTC: {
    child: {
      module: "resource:///actors/WebRTCChild.jsm",
      messages: [
        "rtcpeer:Allow",
        "rtcpeer:Deny",
        "webrtc:Allow",
        "webrtc:Deny",
        "webrtc:StopSharing",
      ],
    },
  },
};

(function earlyBlankFirstPaint() {
  if (!Services.prefs.getBoolPref("browser.startup.blankWindow", false))
    return;

  // Until bug 1450626 and bug 1488384 are fixed, skip the blank window when
  // using a non-default theme.
  if (Services.prefs.getCharPref("lightweightThemes.selectedThemeID", "") !=
        "default-theme@mozilla.org")
    return;

  let store = Services.xulStore;
  let getValue = attr =>
    store.getValue(AppConstants.BROWSER_CHROME_URL, "main-window", attr);
  let width = getValue("width");
  let height = getValue("height");

  // The clean profile case isn't handled yet. Return early for now.
  if (!width || !height)
    return;

  let browserWindowFeatures =
    "chrome,all,dialog=no,extrachrome,menubar,resizable,scrollbars,status," +
    "location,toolbar,personalbar";
  let win = Services.ww.openWindow(null, "about:blank", null,
                                   browserWindowFeatures, null);

  // Hide the titlebar if the actual browser window will draw in it.
  let hiddenTitlebar =
    Services.prefs.getBoolPref("browser.tabs.drawInTitlebar",
      win.matchMedia("(-moz-gtk-csd-hide-titlebar-by-default)").matches);
  if (hiddenTitlebar) {
    win.windowUtils.setChromeMargin(0, 2, 2, 2);
  }

  let docElt = win.document.documentElement;
  docElt.setAttribute("screenX", getValue("screenX"));
  docElt.setAttribute("screenY", getValue("screenY"));

  // The sizemode="maximized" attribute needs to be set before first paint.
  let sizemode = getValue("sizemode");
  if (sizemode == "maximized") {
    docElt.setAttribute("sizemode", sizemode);

    // Set the size to use when the user leaves the maximized mode.
    // The persisted size is the outer size, but the height/width
    // attributes set the inner size.
    let xulWin = win.docShell.treeOwner
                    .QueryInterface(Ci.nsIInterfaceRequestor)
                    .getInterface(Ci.nsIXULWindow);
    height -= xulWin.outerToInnerHeightDifferenceInCSSPixels;
    width -= xulWin.outerToInnerWidthDifferenceInCSSPixels;
    docElt.setAttribute("height", height);
    docElt.setAttribute("width", width);
  } else {
    // Setting the size of the window in the features string instead of here
    // causes the window to grow by the size of the titlebar.
    win.resizeTo(width, height);
  }

  // Set this before showing the window so that graphics code can use it to
  // decide to skip some expensive code paths (eg. starting the GPU process).
  docElt.setAttribute("windowtype", "navigator:blank");

  // The window becomes visible after OnStopRequest, so make this happen now.
  win.stop();

  let { TelemetryTimestamps } =
    ChromeUtils.import("resource://gre/modules/TelemetryTimestamps.jsm");
  TelemetryTimestamps.add("blankWindowShown");
})();

XPCOMUtils.defineLazyServiceGetters(this, {
  aboutNewTabService: ["@mozilla.org/browser/aboutnewtab-service;1", "nsIAboutNewTabService"],
});
XPCOMUtils.defineLazyGetter(this, "WeaveService", () =>
  Cc["@mozilla.org/weave/service;1"].getService().wrappedJSObject
);

// lazy module getters

XPCOMUtils.defineLazyModuleGetters(this, {
  AboutPrivateBrowsingHandler: "resource:///modules/aboutpages/AboutPrivateBrowsingHandler.jsm",
  AddonManager: "resource://gre/modules/AddonManager.jsm",
  AppMenuNotifications: "resource://gre/modules/AppMenuNotifications.jsm",
  AsyncShutdown: "resource://gre/modules/AsyncShutdown.jsm",
  AutoCompletePopup: "resource://gre/modules/AutoCompletePopup.jsm",
  Blocklist: "resource://gre/modules/Blocklist.jsm",
  BookmarkHTMLUtils: "resource://gre/modules/BookmarkHTMLUtils.jsm",
  BookmarkJSONUtils: "resource://gre/modules/BookmarkJSONUtils.jsm",
  BrowserUsageTelemetry: "resource:///modules/BrowserUsageTelemetry.jsm",
  BrowserWindowTracker: "resource:///modules/BrowserWindowTracker.jsm",
  ContextualIdentityService: "resource://gre/modules/ContextualIdentityService.jsm",
  DateTimePickerParent: "resource://gre/modules/DateTimePickerParent.jsm",
  Discovery: "resource:///modules/Discovery.jsm",
  ExtensionsUI: "resource:///modules/ExtensionsUI.jsm",
  FileSource: "resource://gre/modules/L10nRegistry.jsm",
  FxAccounts: "resource://gre/modules/FxAccounts.jsm",
  HomePage: "resource:///modules/HomePage.jsm",
  HybridContentTelemetry: "resource://gre/modules/HybridContentTelemetry.jsm",
  Integration: "resource://gre/modules/Integration.jsm",
  L10nRegistry: "resource://gre/modules/L10nRegistry.jsm",
  LightweightThemeManager: "resource://gre/modules/LightweightThemeManager.jsm",
  LiveBookmarkMigrator: "resource:///modules/LiveBookmarkMigrator.jsm",
  NewTabUtils: "resource://gre/modules/NewTabUtils.jsm",
  Normandy: "resource://normandy/Normandy.jsm",
  ObjectUtils: "resource://gre/modules/ObjectUtils.jsm",
  OS: "resource://gre/modules/osfile.jsm",
  PageActions: "resource:///modules/PageActions.jsm",
  PageThumbs: "resource://gre/modules/PageThumbs.jsm",
  PdfJs: "resource://pdf.js/PdfJs.jsm",
  PermissionUI: "resource:///modules/PermissionUI.jsm",
  PingCentre: "resource:///modules/PingCentre.jsm",
  PlacesBackups: "resource://gre/modules/PlacesBackups.jsm",
  PlacesUtils: "resource://gre/modules/PlacesUtils.jsm",
  PluralForm: "resource://gre/modules/PluralForm.jsm",
  PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.jsm",
  ProcessHangMonitor: "resource:///modules/ProcessHangMonitor.jsm",
  RemoteSettings: "resource://services-settings/remote-settings.js",
  RFPHelper: "resource://gre/modules/RFPHelper.jsm",
  SafeBrowsing: "resource://gre/modules/SafeBrowsing.jsm",
  Sanitizer: "resource:///modules/Sanitizer.jsm",
  SaveToPocket: "chrome://pocket/content/SaveToPocket.jsm",
  SearchTelemetry: "resource:///modules/SearchTelemetry.jsm",
  SessionStartup: "resource:///modules/sessionstore/SessionStartup.jsm",
  SessionStore: "resource:///modules/sessionstore/SessionStore.jsm",
  ShellService: "resource:///modules/ShellService.jsm",
  TabCrashHandler: "resource:///modules/ContentCrashHandlers.jsm",
  TabUnloader: "resource:///modules/TabUnloader.jsm",
  UIState: "resource://services-sync/UIState.jsm",
  UITour: "resource:///modules/UITour.jsm",
  WebChannel: "resource://gre/modules/WebChannel.jsm",
  WindowsRegistry: "resource://gre/modules/WindowsRegistry.jsm",
});

// eslint-disable-next-line no-unused-vars
XPCOMUtils.defineLazyModuleGetters(this, {
  AsyncPrefs: "resource://gre/modules/AsyncPrefs.jsm",
  ContentClick: "resource:///modules/ContentClick.jsm",
  FormValidationHandler: "resource:///modules/FormValidationHandler.jsm",
  LoginManagerParent: "resource://gre/modules/LoginManagerParent.jsm",
  PictureInPicture: "resource://gre/modules/PictureInPicture.jsm",
  ReaderParent: "resource:///modules/ReaderParent.jsm",
  RemotePrompt: "resource:///modules/RemotePrompt.jsm",
});

/* global ContentPrefServiceParent:false, ContentSearch:false,
          UpdateListener:false, webrtcUI:false */

/**
 * IF YOU ADD OR REMOVE FROM THIS LIST, PLEASE UPDATE THE LIST ABOVE AS WELL.
 * XXX Bug 1325373 is for making eslint detect these automatically.
 */

let initializedModules = {};

[
  ["ContentPrefServiceParent", "resource://gre/modules/ContentPrefServiceParent.jsm", "alwaysInit"],
  ["ContentSearch", "resource:///modules/ContentSearch.jsm", "init"],
  ["UpdateListener", "resource://gre/modules/UpdateListener.jsm", "init"],
  ["webrtcUI", "resource:///modules/webrtcUI.jsm", "init"],
].forEach(([name, resource, init]) => {
  XPCOMUtils.defineLazyGetter(this, name, () => {
    ChromeUtils.import(resource, initializedModules);
    initializedModules[name][init]();
    return initializedModules[name];
  });
});

if (AppConstants.MOZ_CRASHREPORTER) {
  XPCOMUtils.defineLazyModuleGetters(this, {
    PluginCrashReporter: "resource:///modules/ContentCrashHandlers.jsm",
    UnsubmittedCrashHandler: "resource:///modules/ContentCrashHandlers.jsm",
  });
}

XPCOMUtils.defineLazyGetter(this, "gBrandBundle", function() {
  return Services.strings.createBundle("chrome://branding/locale/brand.properties");
});

XPCOMUtils.defineLazyGetter(this, "gBrowserBundle", function() {
  return Services.strings.createBundle("chrome://browser/locale/browser.properties");
});

XPCOMUtils.defineLazyGetter(this, "gTabbrowserBundle", function() {
  return Services.strings.createBundle("chrome://browser/locale/tabbrowser.properties");
});

const global = this;

const listeners = {
  observers: {
    "update-staged": ["UpdateListener"],
    "update-downloaded": ["UpdateListener"],
    "update-available": ["UpdateListener"],
    "update-error": ["UpdateListener"],
  },

  ppmm: {
    // PLEASE KEEP THIS LIST IN SYNC WITH THE LISTENERS ADDED IN ContentPrefServiceParent.init
    "ContentPrefs:FunctionCall": ["ContentPrefServiceParent"],
    "ContentPrefs:AddObserverForName": ["ContentPrefServiceParent"],
    "ContentPrefs:RemoveObserverForName": ["ContentPrefServiceParent"],
    // PLEASE KEEP THIS LIST IN SYNC WITH THE LISTENERS ADDED IN ContentPrefServiceParent.init

    // PLEASE KEEP THIS LIST IN SYNC WITH THE LISTENERS ADDED IN AsyncPrefs.init
    "AsyncPrefs:SetPref": ["AsyncPrefs"],
    "AsyncPrefs:ResetPref": ["AsyncPrefs"],
    // PLEASE KEEP THIS LIST IN SYNC WITH THE LISTENERS ADDED IN AsyncPrefs.init

    "webrtc:UpdateGlobalIndicators": ["webrtcUI"],
    "webrtc:UpdatingIndicators": ["webrtcUI"],
  },

  mm: {
    "Content:Click": ["ContentClick"],
    "ContentSearch": ["ContentSearch"],
    "FormValidation:ShowPopup": ["FormValidationHandler"],
    "FormValidation:HidePopup": ["FormValidationHandler"],
    "PictureInPicture:Request": ["PictureInPicture"],
    "PictureInPicture:Close": ["PictureInPicture"],
    "Prompt:Open": ["RemotePrompt"],
    "Reader:FaviconRequest": ["ReaderParent"],
    "Reader:UpdateReaderButton": ["ReaderParent"],
    // PLEASE KEEP THIS LIST IN SYNC WITH THE MOBILE LISTENERS IN BrowserCLH.js
    "RemoteLogins:findLogins": ["LoginManagerParent"],
    "RemoteLogins:findRecipes": ["LoginManagerParent"],
    "RemoteLogins:onFormSubmit": ["LoginManagerParent"],
    "RemoteLogins:autoCompleteLogins": ["LoginManagerParent"],
    "RemoteLogins:removeLogin": ["LoginManagerParent"],
    "RemoteLogins:insecureLoginFormPresent": ["LoginManagerParent"],
    // PLEASE KEEP THIS LIST IN SYNC WITH THE MOBILE LISTENERS IN BrowserCLH.js
    "rtcpeer:CancelRequest": ["webrtcUI"],
    "rtcpeer:Request": ["webrtcUI"],
    "webrtc:CancelRequest": ["webrtcUI"],
    "webrtc:Request": ["webrtcUI"],
    "webrtc:StopRecording": ["webrtcUI"],
    "webrtc:UpdateBrowserIndicators": ["webrtcUI"],
  },

  observe(subject, topic, data) {
    for (let module of this.observers[topic]) {
      try {
        global[module].observe(subject, topic, data);
      } catch (e) {
        Cu.reportError(e);
      }
    }
  },

  receiveMessage(modules, data) {
    let val;
    for (let module of modules[data.name]) {
      try {
        val = global[module].receiveMessage(data) || val;
      } catch (e) {
        Cu.reportError(e);
      }
    }
    return val;
  },

  init() {
    for (let observer of Object.keys(this.observers)) {
      Services.obs.addObserver(this, observer);
    }

    let receiveMessageMM = this.receiveMessage.bind(this, this.mm);
    for (let message of Object.keys(this.mm)) {
      Services.mm.addMessageListener(message, receiveMessageMM);
    }

    let receiveMessagePPMM = this.receiveMessage.bind(this, this.ppmm);
    for (let message of Object.keys(this.ppmm)) {
      Services.ppmm.addMessageListener(message, receiveMessagePPMM);
    }
  },
};

// Seconds of idle before trying to create a bookmarks backup.
const BOOKMARKS_BACKUP_IDLE_TIME_SEC = 8 * 60;
// Minimum interval between backups.  We try to not create more than one backup
// per interval.
const BOOKMARKS_BACKUP_MIN_INTERVAL_DAYS = 1;
// Maximum interval between backups.  If the last backup is older than these
// days we will try to create a new one more aggressively.
const BOOKMARKS_BACKUP_MAX_INTERVAL_DAYS = 3;
// Seconds of idle time before the late idle tasks will be scheduled.
const LATE_TASKS_IDLE_TIME_SEC = 20;
// Time after we stop tracking startup crashes.
const STARTUP_CRASHES_END_DELAY_MS = 30 * 1000;

/*
 * OS X has the concept of zero-window sessions and therefore ignores the
 * browser-lastwindow-close-* topics.
 */
const OBSERVE_LASTWINDOW_CLOSE_TOPICS = AppConstants.platform != "macosx";

function BrowserGlue() {
  XPCOMUtils.defineLazyServiceGetter(this, "_idleService",
                                     "@mozilla.org/widget/idleservice;1",
                                     "nsIIdleService");

  XPCOMUtils.defineLazyGetter(this, "_distributionCustomizer", function() {
                                const {DistributionCustomizer} = ChromeUtils.import("resource:///modules/distribution.js");
                                return new DistributionCustomizer();
                              });

  XPCOMUtils.defineLazyServiceGetter(this, "AlertsService", "@mozilla.org/alerts-service;1", "nsIAlertsService");

  this._init();
}

BrowserGlue.prototype = {
  _saveSession: false,
  _migrationImportsDefaultBookmarks: false,
  _placesBrowserInitComplete: false,

  _setPrefToSaveSession: function BG__setPrefToSaveSession(aForce) {
    if (!this._saveSession && !aForce)
      return;

    if (!PrivateBrowsingUtils.permanentPrivateBrowsing) {
      Services.prefs.setBoolPref("browser.sessionstore.resume_session_once", true);
    }

    // This method can be called via [NSApplication terminate:] on Mac, which
    // ends up causing prefs not to be flushed to disk, so we need to do that
    // explicitly here. See bug 497652.
    Services.prefs.savePrefFile(null);
  },

  _setSyncAutoconnectDelay: function BG__setSyncAutoconnectDelay() {
    // Assume that a non-zero value for services.sync.autoconnectDelay should override
    if (Services.prefs.prefHasUserValue("services.sync.autoconnectDelay")) {
      let prefDelay = Services.prefs.getIntPref("services.sync.autoconnectDelay");

      if (prefDelay > 0)
        return;
    }

    // delays are in seconds
    const MAX_DELAY = 300;
    let delay = 3;
    for (let win of Services.wm.getEnumerator("navigator:browser")) {
      // browser windows without a gBrowser almost certainly means we are
      // shutting down, so instead of just ignoring that window we abort.
      if (win.closed || !win.gBrowser) {
        return;
      }
      delay += win.gBrowser.tabs.length;
    }
    delay = delay <= MAX_DELAY ? delay : MAX_DELAY;

    const {Weave} = ChromeUtils.import("resource://services-sync/main.js");
    Weave.Service.scheduler.delayedAutoConnect(delay);
  },

  /**
   * Lazily initialize PingCentre
   */
  get pingCentre() {
    const MAIN_TOPIC_ID = "main";
    Object.defineProperty(this, "pingCentre", {
      value: new PingCentre({ topic: MAIN_TOPIC_ID }),
    });
    return this.pingCentre;
  },

  _sendMainPingCentrePing() {
    let newTabSetting;
    let homePageSetting;

    // Check whether or not about:home and about:newtab have been overridden at this point.
    // Different settings are encoded as follows:
    //   * Value 0: default
    //   * Value 1: about:blank
    //   * Value 2: web extension
    //   * Value 3: other custom URL(s)
    // Settings for about:newtab and about:home are combined in a bitwise manner.

    // Note that a user could use about:blank and web extension at the same time
    // to overwrite the about:newtab, but the web extension takes priority, so the
    // ordering matters in the following check.
    if (Services.prefs.getBoolPref("browser.newtabpage.enabled") &&
                                   !aboutNewTabService.overridden) {
      newTabSetting = 0;
    } else if (aboutNewTabService.newTabURL.startsWith("moz-extension://")) {
      newTabSetting = 2;
    } else if (!Services.prefs.getBoolPref("browser.newtabpage.enabled")) {
      newTabSetting = 1;
    } else {
      newTabSetting = 3;
    }

    const homePageURL = HomePage.get();
    if (homePageURL === "about:home") {
      homePageSetting = 0;
    } else if (homePageURL === "about:blank") {
      homePageSetting = 1;
    } else if (homePageURL.startsWith("moz-extension://")) {
      homePageSetting = 2;
    } else {
      homePageSetting = 3;
    }

    const payload = {
      event: "AS_ENABLED",
      value: newTabSetting | (homePageSetting << 2),
    };
    const ACTIVITY_STREAM_ID = "activity-stream";
    const options = {filter: ACTIVITY_STREAM_ID};
    this.pingCentre.sendPing(payload, options);
  },

  // nsIObserver implementation
  observe: async function BG_observe(subject, topic, data) {
    switch (topic) {
      case "notifications-open-settings":
        this._openPreferences("privacy-permissions", { origin: "notifOpenSettings" });
        break;
      case "final-ui-startup":
        this._beforeUIStartup();
        break;
      case "browser-delayed-startup-finished":
        this._onFirstWindowLoaded(subject);
        Services.obs.removeObserver(this, "browser-delayed-startup-finished");
        break;
      case "sessionstore-windows-restored":
        this._onWindowsRestored();
        break;
      case "browser:purge-session-history":
        // reset the console service's error buffer
        Services.console.logStringMessage(null); // clear the console (in case it's open)
        Services.console.reset();
        break;
      case "restart-in-safe-mode":
        this._onSafeModeRestart();
        break;
      case "quit-application-requested":
        this._onQuitRequest(subject, data);
        break;
      case "quit-application-granted":
        this._onQuitApplicationGranted();
        break;
      case "browser-lastwindow-close-requested":
        if (OBSERVE_LASTWINDOW_CLOSE_TOPICS) {
          // The application is not actually quitting, but the last full browser
          // window is about to be closed.
          this._onQuitRequest(subject, "lastwindow");
        }
        break;
      case "browser-lastwindow-close-granted":
        if (OBSERVE_LASTWINDOW_CLOSE_TOPICS) {
          this._setPrefToSaveSession();
        }
        break;
      case "weave:service:ready":
        this._setSyncAutoconnectDelay();
        break;
      case "fxaccounts:onverified":
        this._showSyncStartedDoorhanger();
        break;
      case "fxaccounts:device_connected":
        this._onDeviceConnected(data);
        break;
      case "fxaccounts:verify_login":
        this._onVerifyLoginNotification(JSON.parse(data));
        break;
      case "fxaccounts:device_disconnected":
        data = JSON.parse(data);
        if (data.isLocalDevice) {
          this._onDeviceDisconnected();
        }
        break;
      case "fxaccounts:commands:open-uri":
      case "weave:engine:clients:display-uris":
        this._onDisplaySyncURIs(subject);
        break;
      case "session-save":
        this._setPrefToSaveSession(true);
        subject.QueryInterface(Ci.nsISupportsPRBool);
        subject.data = true;
        break;
      case "places-init-complete":
        Services.obs.removeObserver(this, "places-init-complete");
        if (!this._migrationImportsDefaultBookmarks)
          this._initPlaces(false);
        break;
      case "idle":
        this._backupBookmarks();
        break;
      case "distribution-customization-complete":
        Services.obs.removeObserver(this, "distribution-customization-complete");
        // Customization has finished, we don't need the customizer anymore.
        delete this._distributionCustomizer;
        break;
      case "browser-glue-test": // used by tests
        if (data == "post-update-notification") {
          if (Services.prefs.prefHasUserValue("app.update.postupdate"))
            this._showUpdateNotification();
        } else if (data == "force-ui-migration") {
          this._migrateUI();
        } else if (data == "force-distribution-customization") {
          this._distributionCustomizer.applyCustomizations();
          // To apply distribution bookmarks use "places-init-complete".
        } else if (data == "force-places-init") {
          this._initPlaces(false);
        } else if (data == "mock-alerts-service") {
          Object.defineProperty(this, "AlertsService", {
            value: subject.wrappedJSObject,
          });
        } else if (data == "places-browser-init-complete") {
          if (this._placesBrowserInitComplete) {
            Services.obs.notifyObservers(null, "places-browser-init-complete");
          }
        } else if (data == "migrateMatchBucketsPrefForUI66") {
          this._migrateMatchBucketsPrefForUI66().then(() => {
            Services.obs.notifyObservers(null, "browser-glue-test",
                                         "migrateMatchBucketsPrefForUI66-done");
          });
        }
        break;
      case "initial-migration-will-import-default-bookmarks":
        this._migrationImportsDefaultBookmarks = true;
        break;
      case "initial-migration-did-import-default-bookmarks":
        this._initPlaces(true);
        break;
      case "handle-xul-text-link":
        let linkHandled = subject.QueryInterface(Ci.nsISupportsPRBool);
        if (!linkHandled.data) {
          let win = BrowserWindowTracker.getTopWindow();
          if (win) {
            data = JSON.parse(data);
            let where = win.whereToOpenLink(data);
            // Preserve legacy behavior of non-modifier left-clicks
            // opening in a new selected tab.
            if (where == "current") {
              where = "tab";
            }
            win.openTrustedLinkIn(data.href, where);
            linkHandled.data = true;
          }
        }
        break;
      case "profile-before-change":
         // Any component depending on Places should be finalized in
         // _onPlacesShutdown.  Any component that doesn't need to act after
         // the UI has gone should be finalized in _onQuitApplicationGranted.
        this._dispose();
        break;
      case "keyword-search":
        // This notification is broadcast by the docshell when it "fixes up" a
        // URI that it's been asked to load into a keyword search.
        let engine = null;
        try {
          engine = subject.QueryInterface(Ci.nsISearchEngine);
        } catch (ex) {
          Cu.reportError(ex);
        }
        let win = BrowserWindowTracker.getTopWindow();
        win.BrowserSearch.recordSearchInTelemetry(engine, "urlbar");
        break;
      case "browser-search-engine-modified":
        // Ensure we cleanup the hiddenOneOffs pref when removing
        // an engine, and that newly added engines are visible.
        if (data == "engine-added" || data == "engine-removed") {
          let engineName = subject.QueryInterface(Ci.nsISearchEngine).name;
          let pref = Services.prefs.getStringPref("browser.search.hiddenOneOffs");
          let hiddenList = pref ? pref.split(",") : [];
          hiddenList = hiddenList.filter(x => x !== engineName);
          Services.prefs.setStringPref("browser.search.hiddenOneOffs", hiddenList.join(","));
        }
        break;
      case "flash-plugin-hang":
        this._handleFlashHang();
        break;
      case "xpi-signature-changed":
        let disabledAddons = JSON.parse(data).disabled;
        let addons = await AddonManager.getAddonsByIDs(disabledAddons);
        if (addons.some(addon => addon)) {
          this._notifyUnsignedAddonsDisabled();
        }
        break;
      case "sync-ui-state:update":
        this._updateFxaBadges();
        break;
      case "handlersvc-store-initialized":
        // Initialize PdfJs when running in-process and remote. This only
        // happens once since PdfJs registers global hooks. If the PdfJs
        // extension is installed the init method below will be overridden
        // leaving initialization to the extension.
        // parent only: configure default prefs, set up pref observers, register
        // pdf content handler, and initializes parent side message manager
        // shim for privileged api access.
        PdfJs.init(true);
        break;
      case "shield-init-complete":
        this._shieldInitComplete = true;
        this._sendMainPingCentrePing();
        break;
    }
  },

  // initialization (called on application startup)
  _init: function BG__init() {
    let os = Services.obs;
    os.addObserver(this, "notifications-open-settings");
    os.addObserver(this, "final-ui-startup");
    os.addObserver(this, "browser-delayed-startup-finished");
    os.addObserver(this, "sessionstore-windows-restored");
    os.addObserver(this, "browser:purge-session-history");
    os.addObserver(this, "quit-application-requested");
    os.addObserver(this, "quit-application-granted");
    if (OBSERVE_LASTWINDOW_CLOSE_TOPICS) {
      os.addObserver(this, "browser-lastwindow-close-requested");
      os.addObserver(this, "browser-lastwindow-close-granted");
    }
    os.addObserver(this, "weave:service:ready");
    os.addObserver(this, "fxaccounts:onverified");
    os.addObserver(this, "fxaccounts:device_connected");
    os.addObserver(this, "fxaccounts:verify_login");
    os.addObserver(this, "fxaccounts:device_disconnected");
    os.addObserver(this, "fxaccounts:commands:open-uri");
    os.addObserver(this, "weave:engine:clients:display-uris");
    os.addObserver(this, "session-save");
    os.addObserver(this, "places-init-complete");
    os.addObserver(this, "distribution-customization-complete");
    os.addObserver(this, "handle-xul-text-link");
    os.addObserver(this, "profile-before-change");
    os.addObserver(this, "keyword-search");
    os.addObserver(this, "browser-search-engine-modified");
    os.addObserver(this, "restart-in-safe-mode");
    os.addObserver(this, "flash-plugin-hang");
    os.addObserver(this, "xpi-signature-changed");
    os.addObserver(this, "sync-ui-state:update");
    os.addObserver(this, "handlersvc-store-initialized");
    os.addObserver(this, "shield-init-complete");

    ActorManagerParent.addActors(ACTORS);
    ActorManagerParent.flush();

    this._flashHangCount = 0;
    this._firstWindowReady = new Promise(resolve => this._firstWindowLoaded = resolve);
    if (AppConstants.platform == "win") {
      JawsScreenReaderVersionCheck.init();
    }
  },

  // cleanup (called on application shutdown)
  _dispose: function BG__dispose() {
    let os = Services.obs;
    os.removeObserver(this, "notifications-open-settings");
    os.removeObserver(this, "final-ui-startup");
    os.removeObserver(this, "sessionstore-windows-restored");
    os.removeObserver(this, "browser:purge-session-history");
    os.removeObserver(this, "quit-application-requested");
    os.removeObserver(this, "quit-application-granted");
    os.removeObserver(this, "restart-in-safe-mode");
    if (OBSERVE_LASTWINDOW_CLOSE_TOPICS) {
      os.removeObserver(this, "browser-lastwindow-close-requested");
      os.removeObserver(this, "browser-lastwindow-close-granted");
    }
    os.removeObserver(this, "weave:service:ready");
    os.removeObserver(this, "fxaccounts:onverified");
    os.removeObserver(this, "fxaccounts:device_connected");
    os.removeObserver(this, "fxaccounts:verify_login");
    os.removeObserver(this, "fxaccounts:device_disconnected");
    os.removeObserver(this, "fxaccounts:commands:open-uri");
    os.removeObserver(this, "weave:engine:clients:display-uris");
    os.removeObserver(this, "session-save");
    if (this._bookmarksBackupIdleTime) {
      this._idleService.removeIdleObserver(this, this._bookmarksBackupIdleTime);
      delete this._bookmarksBackupIdleTime;
    }
    if (this._lateTasksIdleObserver) {
      this._idleService.removeIdleObserver(this._lateTasksIdleObserver, LATE_TASKS_IDLE_TIME_SEC);
      delete this._lateTasksIdleObserver;
    }
    if (this._gmpInstallManager) {
      this._gmpInstallManager.uninit();
      delete this._gmpInstallManager;
    }
    try {
      os.removeObserver(this, "places-init-complete");
    } catch (ex) { /* Could have been removed already */ }
    os.removeObserver(this, "handle-xul-text-link");
    os.removeObserver(this, "profile-before-change");
    os.removeObserver(this, "keyword-search");
    os.removeObserver(this, "browser-search-engine-modified");
    os.removeObserver(this, "flash-plugin-hang");
    os.removeObserver(this, "xpi-signature-changed");
    os.removeObserver(this, "sync-ui-state:update");
    os.removeObserver(this, "shield-init-complete");

    Services.prefs.removeObserver("privacy.trackingprotection", this._matchCBCategory);
    Services.prefs.removeObserver("urlclassifier.trackingTable", this._matchCBCategory);
    Services.prefs.removeObserver("network.cookie.cookieBehavior", this._matchCBCategory);
    Services.prefs.removeObserver(ContentBlockingCategoriesPrefs.PREF_CB_CATEGORY, this._updateCBCategory);
  },

  // runs on startup, before the first command line handler is invoked
  // (i.e. before the first window is opened)
  _beforeUIStartup: function BG__beforeUIStartup() {
    SessionStartup.init();

    if (Services.prefs.prefHasUserValue(PREF_PDFJS_ENABLED_CACHE_STATE)) {
      Services.ppmm.sharedData.set(
        "pdfjs.enabled",
        Services.prefs.getBoolPref(PREF_PDFJS_ENABLED_CACHE_STATE));
    } else {
      PdfJs.earlyInit();
    }

    // Initialize the default l10n resource sources for L10nRegistry.
    let locales = Services.locale.packagedLocales;
    const greSource = new FileSource("toolkit", locales, "resource://gre/localization/{locale}/");
    L10nRegistry.registerSource(greSource);

    const appSource = new FileSource("app", locales, "resource://app/localization/{locale}/");
    L10nRegistry.registerSource(appSource);

    // check if we're in safe mode
    if (Services.appinfo.inSafeMode) {
      Services.ww.openWindow(null, "chrome://browser/content/safeMode.xul",
                             "_blank", "chrome,centerscreen,modal,resizable=no", null);
    }

    // apply distribution customizations
    this._distributionCustomizer.applyCustomizations();

    // handle any UI migration
    this._migrateUI();

    listeners.init();

    SessionStore.init();

    let vendorShortName = gBrandBundle.GetStringFromName("vendorShortName");

    LightweightThemeManager.addBuiltInTheme({
      id: "firefox-compact-light@mozilla.org",
      name: gBrowserBundle.GetStringFromName("lightTheme.name"),
      description: gBrowserBundle.GetStringFromName("lightTheme.description"),
      iconURL: "resource:///chrome/browser/content/browser/defaultthemes/light.icon.svg",
      textcolor: "rgb(24, 25, 26)",
      icon_color: "rgb(24, 25, 26, 0.7)",
      accentcolor: "#E3E4E6",
      popup: "#fff",
      popup_text: "#0c0c0d",
      popup_border: "#ccc",
      tab_line: "#0a84ff",
      toolbarColor: "#f5f6f7",
      toolbar_bottom_separator: "#ccc",
      toolbar_field: "#fff",
      toolbar_field_border: "#ccc",
      author: vendorShortName,
    });
    LightweightThemeManager.addBuiltInTheme({
      id: "firefox-compact-dark@mozilla.org",
      name: gBrowserBundle.GetStringFromName("darkTheme.name"),
      description: gBrowserBundle.GetStringFromName("darkTheme.description"),
      iconURL: "resource:///chrome/browser/content/browser/defaultthemes/dark.icon.svg",
      textcolor: "rgb(249, 249, 250)",
      icon_color: "rgb(249, 249, 250, 0.7)",
      accentcolor: "hsl(240, 5%, 5%)",
      popup: "#4a4a4f",
      popup_text: "rgb(249, 249, 250)",
      popup_border: "#27272b",
      tab_line: "#0a84ff",
      toolbarColor: "hsl(240, 1%, 20%)",
      toolbar_bottom_separator: "hsl(240, 5%, 5%)",
      toolbar_field: "rgb(71, 71, 73)",
      toolbar_field_border: "rgba(249, 249, 250, 0.2)",
      toolbar_field_separator: "#5F6670",
      toolbar_field_text: "rgb(249, 249, 250)",
      ntp_background: "#2A2A2E",
      ntp_text: "rgb(249, 249, 250)",
      sidebar: "#38383D",
      sidebar_text: "rgb(249, 249, 250)",
      sidebar_border: "rgba(255, 255, 255, 0.1)",
      author: vendorShortName,
    }, {
      useInDarkMode: true,
    });

    Normandy.init();

    SaveToPocket.init();
    Services.obs.notifyObservers(null, "browser-ui-startup-complete");
  },

  _checkForOldBuildUpdates() {
    // check for update if our build is old
    if (AppConstants.MOZ_UPDATER &&
        Services.prefs.getBoolPref("app.update.checkInstallTime")) {
      let buildID = Services.appinfo.appBuildID;
      let today = new Date().getTime();
      /* eslint-disable no-multi-spaces */
      let buildDate = new Date(buildID.slice(0, 4),     // year
                               buildID.slice(4, 6) - 1, // months are zero-based.
                               buildID.slice(6, 8),     // day
                               buildID.slice(8, 10),    // hour
                               buildID.slice(10, 12),   // min
                               buildID.slice(12, 14))   // ms
      .getTime();
      /* eslint-enable no-multi-spaces */

      const millisecondsIn24Hours = 86400000;
      let acceptableAge = Services.prefs.getIntPref("app.update.checkInstallTime.days") * millisecondsIn24Hours;

      if (buildDate + acceptableAge < today) {
        Cc["@mozilla.org/updates/update-service;1"].getService(Ci.nsIApplicationUpdateService).checkForBackgroundUpdates();
      }
    }
  },

  _onSafeModeRestart: function BG_onSafeModeRestart() {
    // prompt the user to confirm
    let strings = gBrowserBundle;
    let promptTitle = strings.GetStringFromName("safeModeRestartPromptTitle");
    let promptMessage = strings.GetStringFromName("safeModeRestartPromptMessage");
    let restartText = strings.GetStringFromName("safeModeRestartButton");
    let buttonFlags = (Services.prompt.BUTTON_POS_0 *
                       Services.prompt.BUTTON_TITLE_IS_STRING) +
                      (Services.prompt.BUTTON_POS_1 *
                       Services.prompt.BUTTON_TITLE_CANCEL) +
                      Services.prompt.BUTTON_POS_0_DEFAULT;

    let rv = Services.prompt.confirmEx(null, promptTitle, promptMessage,
                                       buttonFlags, restartText, null, null,
                                       null, {});
    if (rv != 0)
      return;

    let cancelQuit = Cc["@mozilla.org/supports-PRBool;1"]
                       .createInstance(Ci.nsISupportsPRBool);
    Services.obs.notifyObservers(cancelQuit, "quit-application-requested", "restart");

    if (!cancelQuit.data) {
      Services.startup.restartInSafeMode(Ci.nsIAppStartup.eAttemptQuit);
    }
  },

  _trackSlowStartup() {
    if (Services.startup.interrupted ||
        Services.prefs.getBoolPref("browser.slowStartup.notificationDisabled"))
      return;

    let currentTime = Date.now() - Services.startup.getStartupInfo().process;
    let averageTime = 0;
    let samples = 0;
    try {
      averageTime = Services.prefs.getIntPref("browser.slowStartup.averageTime");
      samples = Services.prefs.getIntPref("browser.slowStartup.samples");
    } catch (e) { }

    let totalTime = (averageTime * samples) + currentTime;
    samples++;
    averageTime = totalTime / samples;

    if (samples >= Services.prefs.getIntPref("browser.slowStartup.maxSamples")) {
      if (averageTime > Services.prefs.getIntPref("browser.slowStartup.timeThreshold"))
        this._calculateProfileAgeInDays().then(this._showSlowStartupNotification, null);
      averageTime = 0;
      samples = 0;
    }

    Services.prefs.setIntPref("browser.slowStartup.averageTime", averageTime);
    Services.prefs.setIntPref("browser.slowStartup.samples", samples);
  },

  async _calculateProfileAgeInDays() {
    let ProfileAge = ChromeUtils.import("resource://gre/modules/ProfileAge.jsm", {}).ProfileAge;
    let profileAge = await ProfileAge();

    let creationDate = await profileAge.created;
    let resetDate = await profileAge.reset;

    // if the profile was reset, consider the
    // reset date for its age.
    let profileDate = resetDate || creationDate;

    const ONE_DAY = 24 * 60 * 60 * 1000;
    return (Date.now() - profileDate) / ONE_DAY;
  },

  _showSlowStartupNotification(profileAge) {
    if (profileAge < 90) // 3 months
      return;

    let win = BrowserWindowTracker.getTopWindow();
    if (!win)
      return;

    let productName = gBrandBundle.GetStringFromName("brandFullName");
    let message = win.gNavigatorBundle.getFormattedString("slowStartup.message", [productName]);

    let buttons = [
      {
        label:     win.gNavigatorBundle.getString("slowStartup.helpButton.label"),
        accessKey: win.gNavigatorBundle.getString("slowStartup.helpButton.accesskey"),
        callback() {
          win.openTrustedLinkIn("https://support.mozilla.org/kb/reset-firefox-easily-fix-most-problems", "tab");
        },
      },
      {
        label:     win.gNavigatorBundle.getString("slowStartup.disableNotificationButton.label"),
        accessKey: win.gNavigatorBundle.getString("slowStartup.disableNotificationButton.accesskey"),
        callback() {
          Services.prefs.setBoolPref("browser.slowStartup.notificationDisabled", true);
        },
      },
    ];

    win.gNotificationBox.appendNotification(message, "slow-startup",
      "chrome://browser/skin/slowStartup-16.png",
      win.gNotificationBox.PRIORITY_INFO_LOW, buttons);
  },

  /**
   * Show a notification bar offering a reset.
   *
   * @param reason
   *        String of either "unused" or "uninstall", specifying the reason
   *        why a profile reset is offered.
   */
  _resetProfileNotification(reason) {
    let win = BrowserWindowTracker.getTopWindow();
    if (!win)
      return;

    const {ResetProfile} = ChromeUtils.import("resource://gre/modules/ResetProfile.jsm");
    if (!ResetProfile.resetSupported())
      return;

    let productName = gBrandBundle.GetStringFromName("brandShortName");
    let resetBundle = Services.strings
                              .createBundle("chrome://global/locale/resetProfile.properties");

    let message;
    if (reason == "unused") {
      message = resetBundle.formatStringFromName("resetUnusedProfile.message", [productName], 1);
    } else if (reason == "uninstall") {
      message = resetBundle.formatStringFromName("resetUninstalled.message", [productName], 1);
    } else {
      throw new Error(`Unknown reason (${reason}) given to _resetProfileNotification.`);
    }
    let buttons = [
      {
        label:     resetBundle.formatStringFromName("refreshProfile.resetButton.label", [productName], 1),
        accessKey: resetBundle.GetStringFromName("refreshProfile.resetButton.accesskey"),
        callback() {
          ResetProfile.openConfirmationDialog(win);
        },
      },
    ];

    win.gNotificationBox.appendNotification(message, "reset-profile-notification",
      "chrome://global/skin/icons/question-16.png",
      win.gNotificationBox.PRIORITY_INFO_LOW, buttons);
  },

  _notifyUnsignedAddonsDisabled() {
    let win = BrowserWindowTracker.getTopWindow();
    if (!win)
      return;

    let message = win.gNavigatorBundle.getString("unsignedAddonsDisabled.message");
    let buttons = [
      {
        label:     win.gNavigatorBundle.getString("unsignedAddonsDisabled.learnMore.label"),
        accessKey: win.gNavigatorBundle.getString("unsignedAddonsDisabled.learnMore.accesskey"),
        callback() {
          win.BrowserOpenAddonsMgr("addons://list/extension?unsigned=true");
        },
      },
    ];

    win.gHighPriorityNotificationBox.appendNotification(message,
      "unsigned-addons-disabled", "",
      win.gHighPriorityNotificationBox.PRIORITY_WARNING_MEDIUM, buttons);
  },

  _firstWindowTelemetry(aWindow) {
    let scaling = aWindow.devicePixelRatio * 100;
    try {
      Services.telemetry.getHistogramById("DISPLAY_SCALING").add(scaling);
    } catch (ex) {}
  },

  // the first browser window has finished initializing
  _onFirstWindowLoaded: function BG__onFirstWindowLoaded(aWindow) {
    TabCrashHandler.init();
    if (AppConstants.MOZ_CRASHREPORTER) {
      PluginCrashReporter.init();
    }

    ProcessHangMonitor.init();

    // A channel for "remote troubleshooting" code...
    let channel = new WebChannel("remote-troubleshooting", "remote-troubleshooting");
    channel.listen((id, data, target) => {
      if (data.command == "request") {
        let {Troubleshoot} = ChromeUtils.import("resource://gre/modules/Troubleshoot.jsm");
        Troubleshoot.snapshot(snapshotData => {
          // for privacy we remove crash IDs and all preferences (but bug 1091944
          // exists to expose prefs once we are confident of privacy implications)
          delete snapshotData.crashes;
          delete snapshotData.modifiedPreferences;
          channel.send(snapshotData, target);
        });
      }
    });

    this._trackSlowStartup();

    // Offer to reset a user's profile if it hasn't been used for 60 days.
    const OFFER_PROFILE_RESET_INTERVAL_MS = 60 * 24 * 60 * 60 * 1000;
    let lastUse = Services.appinfo.replacedLockTime;
    let disableResetPrompt = Services.prefs.getBoolPref("browser.disableResetPrompt", false);

    if (!disableResetPrompt && lastUse &&
        Date.now() - lastUse >= OFFER_PROFILE_RESET_INTERVAL_MS) {
      this._resetProfileNotification("unused");
    } else if (AppConstants.platform == "win" && !disableResetPrompt) {
      // Check if we were just re-installed and offer Firefox Reset
      let updateChannel;
      try {
        updateChannel = ChromeUtils.import("resource://gre/modules/UpdateUtils.jsm", {}).UpdateUtils.UpdateChannel;
      } catch (ex) {}
      if (updateChannel) {
        let uninstalledValue =
          WindowsRegistry.readRegKey(Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER,
                                     "Software\\Mozilla\\Firefox",
                                     `Uninstalled-${updateChannel}`);
        let removalSuccessful =
          WindowsRegistry.removeRegKey(Ci.nsIWindowsRegKey.ROOT_KEY_CURRENT_USER,
                                       "Software\\Mozilla\\Firefox",
                                       `Uninstalled-${updateChannel}`);
        if (removalSuccessful && uninstalledValue == "True") {
          this._resetProfileNotification("uninstall");
        }
      }
    }

    this._checkForOldBuildUpdates();

    AutoCompletePopup.init();
    DateTimePickerParent.init();
    // Check if Sync is configured
    if (Services.prefs.prefHasUserValue("services.sync.username")) {
      WeaveService.init();
    }

    PageThumbs.init();

    NewTabUtils.init();

    AboutPrivateBrowsingHandler.init();

    PageActions.init();

    this._firstWindowTelemetry(aWindow);
    this._firstWindowLoaded();

    // Set the default favicon size for UI views that use the page-icon protocol.
    PlacesUtils.favicons.setDefaultIconURIPreferredSize(16 * aWindow.devicePixelRatio);

    this._matchCBCategory();
    // This observes the entire privacy.trackingprotection.* pref tree.
    Services.prefs.addObserver("privacy.trackingprotection", this._matchCBCategory);
    Services.prefs.addObserver("urlclassifier.trackingTable", this._matchCBCategory);
    Services.prefs.addObserver("network.cookie.cookieBehavior", this._matchCBCategory);
    Services.prefs.addObserver(ContentBlockingCategoriesPrefs.PREF_CB_CATEGORY, this._updateCBCategory);
    Services.prefs.addObserver("media.autoplay.default", this._updateAutoplayPref);
  },

  _updateAutoplayPref() {
    let blocked = Services.prefs.getIntPref("media.autoplay.default", 1);
    Services.telemetry.scalarSet("media.autoplay_default_blocked", blocked);
  },

  _matchCBCategory() {
    ContentBlockingCategoriesPrefs.matchCBCategory();
  },

  _updateCBCategory() {
    ContentBlockingCategoriesPrefs.updateCBCategory();
  },

  _recordContentBlockingTelemetry() {
    let recordIdentityPopupEvents = Services.prefs.getBoolPref("security.identitypopup.recordEventElemetry");
    Services.telemetry.setEventRecordingEnabled("security.ui.identitypopup", recordIdentityPopupEvents);

    let tpEnabled = Services.prefs.getBoolPref("privacy.trackingprotection.enabled");
    Services.telemetry.getHistogramById("TRACKING_PROTECTION_ENABLED").add(tpEnabled);

    let tpPBDisabled = Services.prefs.getBoolPref("privacy.trackingprotection.pbmode.enabled");
    Services.telemetry.getHistogramById("TRACKING_PROTECTION_PBM_DISABLED").add(!tpPBDisabled);

    let cookieBehavior = Services.prefs.getIntPref("network.cookie.cookieBehavior");
    Services.telemetry.getHistogramById("COOKIE_BEHAVIOR").add(cookieBehavior);

    let exceptions = 0;
    for (let permission of Services.perms.enumerator) {
      if (permission.type == "trackingprotection") {
        exceptions++;
      }
    }
    Services.telemetry.scalarSet("contentblocking.exceptions", exceptions);

    let fpEnabled = Services.prefs.getBoolPref("privacy.trackingprotection.fingerprinting.enabled");
    let cmEnabled = Services.prefs.getBoolPref("privacy.trackingprotection.cryptomining.enabled");
    let categoryPref;
    switch (Services.prefs.getStringPref("browser.contentblocking.category", null)) {
    case "standard":
      categoryPref = 0;
      break;
    case "strict":
      categoryPref = 1;
      break;
    case "custom":
      categoryPref = 2;
      break;
    default:
      // Any other value is unsupported.
      categoryPref = 3;
      break;
    }

    Services.telemetry.scalarSet("contentblocking.fingerprinting_blocking_enabled", fpEnabled);
    Services.telemetry.scalarSet("contentblocking.cryptomining_blocking_enabled", cmEnabled);
    Services.telemetry.scalarSet("contentblocking.category", categoryPref);
  },

  _sendMediaTelemetry() {
    let win = Services.appShell.hiddenDOMWindow;
    let v = win.document.createElementNS("http://www.w3.org/1999/xhtml", "video");
    v.reportCanPlayTelemetry();
  },

  /**
   * Application shutdown handler.
   */
  _onQuitApplicationGranted() {
    // This pref must be set here because SessionStore will use its value
    // on quit-application.
    this._setPrefToSaveSession();

    // Call trackStartupCrashEnd here in case the delayed call on startup hasn't
    // yet occurred (see trackStartupCrashEnd caller in browser.js).
    try {
      Services.startup.trackStartupCrashEnd();
    } catch (e) {
      Cu.reportError("Could not end startup crash tracking in quit-application-granted: " + e);
    }

    if (this._bookmarksBackupIdleTime) {
      this._idleService.removeIdleObserver(this, this._bookmarksBackupIdleTime);
      delete this._bookmarksBackupIdleTime;
    }

    for (let mod of Object.values(initializedModules)) {
      if (mod.uninit) {
        mod.uninit();
      }
    }

    BrowserUsageTelemetry.uninit();
    SearchTelemetry.uninit();
    // Only uninit PingCentre if the getter has initialized it
    if (Object.prototype.hasOwnProperty.call(this, "pingCentre")) {
      this.pingCentre.uninit();
    }

    PageThumbs.uninit();
    NewTabUtils.uninit();
    AboutPrivateBrowsingHandler.uninit();
    AutoCompletePopup.uninit();
    DateTimePickerParent.uninit();

    Normandy.uninit();
    RFPHelper.uninit();
  },

  // Set up a listener to enable/disable the screenshots extension
  // based on its preference.
  _monitorScreenshotsPref() {
    const PREF = "extensions.screenshots.disabled";
    const ID = "screenshots@mozilla.org";
    const _checkScreenshotsPref = async () => {
      let addon = await AddonManager.getAddonByID(ID);
      let disabled = Services.prefs.getBoolPref(PREF, false);
      if (disabled) {
        await addon.disable({allowSystemAddons: true});
      } else {
        await addon.enable({allowSystemAddons: true});
      }
    };
    Services.prefs.addObserver(PREF, _checkScreenshotsPref);
    _checkScreenshotsPref();
  },

  _monitorWebcompatReporterPref() {
    const PREF = "extensions.webcompat-reporter.enabled";
    const ID = "webcompat-reporter@mozilla.org";
    Services.prefs.addObserver(PREF, async () => {
      let addon = await AddonManager.getAddonByID(ID);
      let enabled = Services.prefs.getBoolPref(PREF, false);
      if (enabled && !addon.isActive) {
        await addon.enable({allowSystemAddons: true});
      } else if (!enabled && addon.isActive) {
        await addon.disable({allowSystemAddons: true});
      }
    });
  },

  _showNewInstallModal() {
    // Allow other observers of the same topic to run while we open the dialog.
    Services.tm.dispatchToMainThread(() => {
      let win = BrowserWindowTracker.getTopWindow();

      let stack = win.gBrowser.getPanel().querySelector(".browserStack");
      let mask = win.document.createElementNS(XULNS, "box");
      mask.setAttribute("id", "content-mask");
      stack.appendChild(mask);

      Services.ww.openWindow(win, "chrome://browser/content/newInstall.xul",
                             "_blank", "chrome,modal,resizable=no,centerscreen", null);
      mask.remove();
    });
  },

  // All initial windows have opened.
  _onWindowsRestored: function BG__onWindowsRestored() {
    if (this._windowsWereRestored) {
      return;
    }
    this._windowsWereRestored = true;

    BrowserUsageTelemetry.init();
    SearchTelemetry.init();

    // Show update notification, if needed.
    if (Services.prefs.prefHasUserValue("app.update.postupdate"))
      this._showUpdateNotification();

    ExtensionsUI.init();

    let signingRequired;
    if (AppConstants.MOZ_REQUIRE_SIGNING) {
      signingRequired = true;
    } else {
      signingRequired = Services.prefs.getBoolPref("xpinstall.signatures.required");
    }

    if (signingRequired) {
      let disabledAddons = AddonManager.getStartupChanges(AddonManager.STARTUP_CHANGE_DISABLED);
      AddonManager.getAddonsByIDs(disabledAddons).then(addons => {
        for (let addon of addons) {
          if (addon.signedState <= AddonManager.SIGNEDSTATE_MISSING) {
            this._notifyUnsignedAddonsDisabled();
            break;
          }
        }
      });
    }

    if (AppConstants.MOZ_CRASHREPORTER) {
      UnsubmittedCrashHandler.init();
    }

    Sanitizer.onStartup();
    this._scheduleStartupIdleTasks();
    this._lateTasksIdleObserver = (idleService, topic, data) => {
      if (topic == "idle") {
        idleService.removeIdleObserver(this._lateTasksIdleObserver,
                                       LATE_TASKS_IDLE_TIME_SEC);
        delete this._lateTasksIdleObserver;
        this._scheduleArbitrarilyLateIdleTasks();
      }
    };
    this._idleService.addIdleObserver(
      this._lateTasksIdleObserver, LATE_TASKS_IDLE_TIME_SEC);

    this._monitorScreenshotsPref();
    this._monitorWebcompatReporterPref();

    let pService = Cc["@mozilla.org/toolkit/profile-service;1"].
                  getService(Ci.nsIToolkitProfileService);
    if (pService.createdAlternateProfile) {
      this._showNewInstallModal();
    }
  },

  /**
   * Use this function as an entry point to schedule tasks that
   * need to run only once after startup, and can be scheduled
   * by using an idle callback.
   *
   * The functions scheduled here will fire from idle callbacks
   * once every window has finished being restored by session
   * restore, and it's guaranteed that they will run before
   * the equivalent per-window idle tasks
   * (from _schedulePerWindowIdleTasks in browser.js).
   *
   * If you have something that can wait even further than the
   * per-window initialization, please schedule them using
   * _scheduleArbitrarilyLateIdleTasks.
   * Don't be fooled by thinking that the use of the timeout parameter
   * will delay your function: it will just ensure that it potentially
   * happens _earlier_ than expected (when the timeout limit has been reached),
   * but it will not make it happen later (and out of order) compared
   * to the other ones scheduled together.
   */
  _scheduleStartupIdleTasks() {
    Services.tm.idleDispatchToMainThread(async () => {
      await ContextualIdentityService.load();
      Discovery.update();
    });

    Services.tm.idleDispatchToMainThread(() => {
      let enableCertErrorUITelemetry =
        Services.prefs.getBoolPref("security.certerrors.recordEventTelemetry", false);
      Services.telemetry.setEventRecordingEnabled("security.ui.certerror",
        enableCertErrorUITelemetry);
    });

    Services.tm.idleDispatchToMainThread(() => {
      this._recordContentBlockingTelemetry();
    });

    // Load the Login Manager data from disk off the main thread, some time
    // after startup.  If the data is required before this runs, for example
    // because a restored page contains a password field, it will be loaded on
    // the main thread, and this initialization request will be ignored.
    Services.tm.idleDispatchToMainThread(() => {
      try {
        Services.logins;
      } catch (ex) {
        Cu.reportError(ex);
      }
    }, 3000);

    // It's important that SafeBrowsing is initialized reasonably
    // early, so we use a maximum timeout for it.
    Services.tm.idleDispatchToMainThread(() => {
      SafeBrowsing.init();
    }, 5000);

    if (AppConstants.MOZ_CRASHREPORTER) {
      UnsubmittedCrashHandler.scheduleCheckForUnsubmittedCrashReports();
    }

    if (AppConstants.ASAN_REPORTER) {
      var {AsanReporter} = ChromeUtils.import("resource:///modules/AsanReporter.jsm");
      AsanReporter.init();
    }

    if (AppConstants.platform == "win") {
      Services.tm.idleDispatchToMainThread(() => {
        // For Windows 7, initialize the jump list module.
        const WINTASKBAR_CONTRACTID = "@mozilla.org/windows-taskbar;1";
        if (WINTASKBAR_CONTRACTID in Cc &&
            Cc[WINTASKBAR_CONTRACTID].getService(Ci.nsIWinTaskbar).available) {
          let temp = {};
          ChromeUtils.import("resource:///modules/WindowsJumpLists.jsm", temp);
          temp.WinTaskbarJumpList.startup();
        }
      });
    }

    Services.tm.idleDispatchToMainThread(() => {
      this._checkForDefaultBrowser();
    });

    Services.tm.idleDispatchToMainThread(() => {
      let {setTimeout} = ChromeUtils.import("resource://gre/modules/Timer.jsm");
      setTimeout(function() {
        Services.tm.idleDispatchToMainThread(Services.startup.trackStartupCrashEnd);
      }, STARTUP_CRASHES_END_DELAY_MS);
    });

    Services.tm.idleDispatchToMainThread(() => {
      let handlerService = Cc["@mozilla.org/uriloader/handler-service;1"].
                           getService(Ci.nsIHandlerService);
      handlerService.asyncInit();
    });

    if (AppConstants.platform == "win") {
      Services.tm.idleDispatchToMainThread(() => {
        JawsScreenReaderVersionCheck.onWindowsRestored();
      });
    }

    Services.tm.idleDispatchToMainThread(() => {
      RFPHelper.init();
    });

    Services.tm.idleDispatchToMainThread(() => {
      Blocklist.loadBlocklistAsync();
    });

    if (Services.prefs.getIntPref("browser.livebookmarks.migrationAttemptsLeft", 0) > 0) {
      Services.tm.idleDispatchToMainThread(() => {
        LiveBookmarkMigrator.migrate().catch(Cu.reportError);
      });
    }

    Services.tm.idleDispatchToMainThread(() => {
      TabUnloader.init();
    });
  },

  /**
   * Use this function as an entry point to schedule tasks that need
   * to run once per session, at any arbitrary point in time.
   * This function will be called from an idle observer. Check the value of
   * LATE_TASKS_IDLE_TIME_SEC to see the current value for this idle
   * observer.
   *
   * Note: this function may never be called if the user is never idle for the
   * full length of the period of time specified. But given a reasonably low
   * value, this is unlikely.
   */
  _scheduleArbitrarilyLateIdleTasks() {
    Services.tm.idleDispatchToMainThread(() => {
      this._sendMediaTelemetry();
    });

    Services.tm.idleDispatchToMainThread(() => {
      // Telemetry for master-password - we do this after a delay as it
      // can cause IO if NSS/PSM has not already initialized.
      let tokenDB = Cc["@mozilla.org/security/pk11tokendb;1"]
                .getService(Ci.nsIPK11TokenDB);
      let token = tokenDB.getInternalKeyToken();
      let mpEnabled = token.hasPassword;
      if (mpEnabled) {
        Services.telemetry.getHistogramById("MASTER_PASSWORD_ENABLED").add(mpEnabled);
      }
    });

    Services.tm.idleDispatchToMainThread(() => {
      let obj = {};
      ChromeUtils.import("resource://gre/modules/GMPInstallManager.jsm", obj);
      this._gmpInstallManager = new obj.GMPInstallManager();
      // We don't really care about the results, if someone is interested they
      // can check the log.
      this._gmpInstallManager.simpleCheckAndInstall().catch(() => {});
    });

    Services.tm.idleDispatchToMainThread(() => {
      RemoteSettings.init();
    });
  },

  _onQuitRequest: function BG__onQuitRequest(aCancelQuit, aQuitType) {
    // If user has already dismissed quit request, then do nothing
    if ((aCancelQuit instanceof Ci.nsISupportsPRBool) && aCancelQuit.data)
      return;

    // There are several cases where we won't show a dialog here:
    // 1. There is only 1 tab open in 1 window
    // 2. browser.warnOnQuit == false
    // 3. The browser is currently in Private Browsing mode
    // 4. The browser will be restarted.
    // 5. The user has automatic session restore enabled and
    //    browser.sessionstore.warnOnQuit is not set to true.
    // 6. The user doesn't have automatic session restore enabled
    //    and browser.tabs.warnOnClose is not set to true.
    //
    // Otherwise, we will show the "closing multiple tabs" dialog.
    //
    // aQuitType == "lastwindow" is overloaded. "lastwindow" is used to indicate
    // "the last window is closing but we're not quitting (a non-browser window is open)"
    // and also "we're quitting by closing the last window".

    if (aQuitType == "restart" || aQuitType == "os-restart")
      return;

    var windowcount = 0;
    var pagecount = 0;
    for (let win of BrowserWindowTracker.orderedWindows) {
      if (win.closed) {
        continue;
      }
      windowcount++;
      let tabbrowser = win.gBrowser;
      if (tabbrowser) {
        pagecount += tabbrowser.browsers.length - tabbrowser._numPinnedTabs -
                     tabbrowser._removingTabs.length;
      }
    }

    if (pagecount < 2)
      return;

    if (!aQuitType)
      aQuitType = "quit";

    // browser.warnOnQuit is a hidden global boolean to override all quit prompts
    if (!Services.prefs.getBoolPref("browser.warnOnQuit"))
      return;

    // If we're going to automatically restore the session, only warn if the user asked for that.
    let sessionWillBeRestored = Services.prefs.getIntPref("browser.startup.page") == 3 ||
                                Services.prefs.getBoolPref("browser.sessionstore.resume_session_once");
    // In the sessionWillBeRestored case, we only check the sessionstore-specific pref:
    if (sessionWillBeRestored) {
      if (!Services.prefs.getBoolPref("browser.sessionstore.warnOnQuit", false)) {
        return;
      }
    // Otherwise, we check browser.tabs.warnOnClose
    } else if (!Services.prefs.getBoolPref("browser.tabs.warnOnClose")) {
      return;
    }

    let win = BrowserWindowTracker.getTopWindow();

    let warningMessage;
    // More than 1 window. Compose our own message.
    if (windowcount > 1) {
      let tabSubstring = gTabbrowserBundle.GetStringFromName("tabs.closeWarningMultipleWindowsTabSnippet");
      tabSubstring = PluralForm.get(pagecount, tabSubstring).replace(/#1/, pagecount);

      let stringID = sessionWillBeRestored ? "tabs.closeWarningMultipleWindowsSessionRestore2"
                                           : "tabs.closeWarningMultipleWindows";
      let windowString = gTabbrowserBundle.GetStringFromName(stringID);
      windowString = PluralForm.get(windowcount, windowString).replace(/#1/, windowcount);
      warningMessage = windowString.replace(/%(?:1\$)?S/i, tabSubstring);
    } else {
      let stringID = sessionWillBeRestored ? "tabs.closeWarningMultipleSessionRestore2"
                                           : "tabs.closeWarningMultiple";
      warningMessage = gTabbrowserBundle.GetStringFromName(stringID);
      warningMessage = PluralForm.get(pagecount, warningMessage).replace("#1", pagecount);
    }

    let warnOnClose = {value: true};
    let titleId = AppConstants.platform == "win" ? "tabs.closeAndQuitTitleTabsWin"
                                                 : "tabs.closeAndQuitTitleTabs";
    let flags = (Services.prompt.BUTTON_TITLE_IS_STRING * Services.prompt.BUTTON_POS_0) +
      (Services.prompt.BUTTON_TITLE_CANCEL * Services.prompt.BUTTON_POS_1);
    // Only display the checkbox in the non-sessionrestore case.
    let checkboxLabel = !sessionWillBeRestored ?
      gTabbrowserBundle.GetStringFromName("tabs.closeWarningPromptMe") : null;

    // buttonPressed will be 0 for closing, 1 for cancel (don't close/quit)
    let buttonPressed = Services.prompt.confirmEx(win,
      gTabbrowserBundle.GetStringFromName(titleId),
      warningMessage, flags,
      gTabbrowserBundle.GetStringFromName("tabs.closeButtonMultiple"),
      null, null,
      checkboxLabel,
      warnOnClose);
    // If the user has unticked the box, and has confirmed closing, stop showing
    // the warning.
    if (!sessionWillBeRestored && buttonPressed == 0 && !warnOnClose.value) {
      Services.prefs.setBoolPref("browser.tabs.warnOnClose", false);
    }
    aCancelQuit.data = buttonPressed != 0;
  },

  _showUpdateNotification: function BG__showUpdateNotification() {
    Services.prefs.clearUserPref("app.update.postupdate");

    var um = Cc["@mozilla.org/updates/update-manager;1"].
             getService(Ci.nsIUpdateManager);
    try {
      // If the updates.xml file is deleted then getUpdateAt will throw.
      var update = um.getUpdateAt(0).QueryInterface(Ci.nsIWritablePropertyBag);
    } catch (e) {
      // This should never happen.
      Cu.reportError("Unable to find update: " + e);
      return;
    }

    var actions = update.getProperty("actions");
    if (!actions || actions.includes("silent"))
      return;

    var appName = gBrandBundle.GetStringFromName("brandShortName");

    function getNotifyString(aPropData) {
      var propValue = update.getProperty(aPropData.propName);
      if (!propValue) {
        if (aPropData.prefName)
          propValue = Services.urlFormatter.formatURLPref(aPropData.prefName);
        else if (aPropData.stringParams)
          propValue = gBrowserBundle.formatStringFromName(aPropData.stringName,
                                                          aPropData.stringParams,
                                                          aPropData.stringParams.length);
        else
          propValue = gBrowserBundle.GetStringFromName(aPropData.stringName);
      }
      return propValue;
    }

    if (actions.includes("showNotification")) {
      let text = getNotifyString({propName: "notificationText",
                                  stringName: "puNotifyText",
                                  stringParams: [appName]});
      let url = getNotifyString({propName: "notificationURL",
                                 prefName: "startup.homepage_override_url"});
      let label = getNotifyString({propName: "notificationButtonLabel",
                                   stringName: "pu.notifyButton.label"});
      let key = getNotifyString({propName: "notificationButtonAccessKey",
                                 stringName: "pu.notifyButton.accesskey"});

      let win = BrowserWindowTracker.getTopWindow();

      let buttons = [
                      {
                        label,
                        accessKey: key,
                        popup:     null,
                        callback(aNotificationBar, aButton) {
                          win.openTrustedLinkIn(url, "tab");
                        },
                      },
                    ];

      win.gHighPriorityNotificationBox.appendNotification(text,
        "post-update-notification", null,
        win.gHighPriorityNotificationBox.PRIORITY_INFO_LOW, buttons);
    }

    if (!actions.includes("showAlert"))
      return;

    let title = getNotifyString({propName: "alertTitle",
                                 stringName: "puAlertTitle",
                                 stringParams: [appName]});
    let text = getNotifyString({propName: "alertText",
                                stringName: "puAlertText",
                                stringParams: [appName]});
    let url = getNotifyString({propName: "alertURL",
                               prefName: "startup.homepage_override_url"});

    function clickCallback(subject, topic, data) {
      // This callback will be called twice but only once with this topic
      if (topic != "alertclickcallback")
        return;
      let win = BrowserWindowTracker.getTopWindow();
      win.openTrustedLinkIn(data, "tab");
    }

    try {
      // This will throw NS_ERROR_NOT_AVAILABLE if the notification cannot
      // be displayed per the idl.
      this.AlertsService.showAlertNotification(null, title, text,
                                          true, url, clickCallback);
    } catch (e) {
      Cu.reportError(e);
    }
  },

  /**
   * Initialize Places
   * - imports the bookmarks html file if bookmarks database is empty, try to
   *   restore bookmarks from a JSON backup if the backend indicates that the
   *   database was corrupt.
   *
   * These prefs can be set up by the frontend:
   *
   * WARNING: setting these preferences to true will overwite existing bookmarks
   *
   * - browser.places.importBookmarksHTML
   *   Set to true will import the bookmarks.html file from the profile folder.
   * - browser.bookmarks.restore_default_bookmarks
   *   Set to true by safe-mode dialog to indicate we must restore default
   *   bookmarks.
   */
  _initPlaces: function BG__initPlaces(aInitialMigrationPerformed) {
    // We must instantiate the history service since it will tell us if we
    // need to import or restore bookmarks due to first-run, corruption or
    // forced migration (due to a major schema change).
    // If the database is corrupt or has been newly created we should
    // import bookmarks.
    let dbStatus = PlacesUtils.history.databaseStatus;

    // Show a notification with a "more info" link for a locked places.sqlite.
    if (dbStatus == PlacesUtils.history.DATABASE_STATUS_LOCKED) {
      // Note: initPlaces should always happen when the first window is ready,
      // in any case, better safe than sorry.
      this._firstWindowReady.then(() => {
        this._showPlacesLockedNotificationBox();
        this._placesBrowserInitComplete = true;
        Services.obs.notifyObservers(null, "places-browser-init-complete");
      });
      return;
    }

    let importBookmarks = !aInitialMigrationPerformed &&
                          (dbStatus == PlacesUtils.history.DATABASE_STATUS_CREATE ||
                           dbStatus == PlacesUtils.history.DATABASE_STATUS_CORRUPT);

    // Check if user or an extension has required to import bookmarks.html
    let importBookmarksHTML = false;
    try {
      importBookmarksHTML =
        Services.prefs.getBoolPref("browser.places.importBookmarksHTML");
      if (importBookmarksHTML)
        importBookmarks = true;
    } catch (ex) {}

    // Support legacy bookmarks.html format for apps that depend on that format.
    let autoExportHTML = Services.prefs.getBoolPref("browser.bookmarks.autoExportHTML", false); // Do not export.
    if (autoExportHTML) {
      // Sqlite.jsm and Places shutdown happen at profile-before-change, thus,
      // to be on the safe side, this should run earlier.
      AsyncShutdown.profileChangeTeardown.addBlocker(
        "Places: export bookmarks.html",
        () => BookmarkHTMLUtils.exportToFile(BookmarkHTMLUtils.defaultPath));
    }

    (async () => {
      // Check if Safe Mode or the user has required to restore bookmarks from
      // default profile's bookmarks.html
      let restoreDefaultBookmarks = false;
      try {
        restoreDefaultBookmarks =
          Services.prefs.getBoolPref("browser.bookmarks.restore_default_bookmarks");
        if (restoreDefaultBookmarks) {
          // Ensure that we already have a bookmarks backup for today.
          await this._backupBookmarks();
          importBookmarks = true;
        }
      } catch (ex) {}

      // This may be reused later, check for "=== undefined" to see if it has
      // been populated already.
      let lastBackupFile;

      // If the user did not require to restore default bookmarks, or import
      // from bookmarks.html, we will try to restore from JSON
      if (importBookmarks && !restoreDefaultBookmarks && !importBookmarksHTML) {
        // get latest JSON backup
        lastBackupFile = await PlacesBackups.getMostRecentBackup();
        if (lastBackupFile) {
          // restore from JSON backup
          await BookmarkJSONUtils.importFromFile(lastBackupFile, {
            replace: true,
            source: PlacesUtils.bookmarks.SOURCES.RESTORE_ON_STARTUP,
          });
          importBookmarks = false;
        } else {
          // We have created a new database but we don't have any backup available
          importBookmarks = true;
          if (await OS.File.exists(BookmarkHTMLUtils.defaultPath)) {
            // If bookmarks.html is available in current profile import it...
            importBookmarksHTML = true;
          } else {
            // ...otherwise we will restore defaults
            restoreDefaultBookmarks = true;
          }
        }
      }

      // Import default bookmarks when necessary.
      // Otherwise, if any kind of import runs, default bookmarks creation should be
      // delayed till the import operations has finished.  Not doing so would
      // cause them to be overwritten by the newly imported bookmarks.
      if (!importBookmarks) {
        // Now apply distribution customized bookmarks.
        // This should always run after Places initialization.
        try {
          await this._distributionCustomizer.applyBookmarks();
        } catch (e) {
          Cu.reportError(e);
        }
      } else {
        // An import operation is about to run.
        let bookmarksUrl = null;
        if (restoreDefaultBookmarks) {
          // User wants to restore bookmarks.html file from default profile folder
          bookmarksUrl = "chrome://browser/locale/bookmarks.html";
        } else if (await OS.File.exists(BookmarkHTMLUtils.defaultPath)) {
          bookmarksUrl = OS.Path.toFileURI(BookmarkHTMLUtils.defaultPath);
        }

        if (bookmarksUrl) {
          // Import from bookmarks.html file.
          try {
            if (Services.policies.isAllowed("defaultBookmarks")) {
              await BookmarkHTMLUtils.importFromURL(bookmarksUrl, {
                replace: true,
                source: PlacesUtils.bookmarks.SOURCES.RESTORE_ON_STARTUP,
              });
            }
          } catch (e) {
            Cu.reportError("Bookmarks.html file could be corrupt. " + e);
          }
          try {
            // Now apply distribution customized bookmarks.
            // This should always run after Places initialization.
            await this._distributionCustomizer.applyBookmarks();
          } catch (e) {
            Cu.reportError(e);
          }
        } else {
          Cu.reportError(new Error("Unable to find bookmarks.html file."));
        }

        // Reset preferences, so we won't try to import again at next run
        if (importBookmarksHTML)
          Services.prefs.setBoolPref("browser.places.importBookmarksHTML", false);
        if (restoreDefaultBookmarks)
          Services.prefs.setBoolPref("browser.bookmarks.restore_default_bookmarks",
                                     false);
      }

      // Initialize bookmark archiving on idle.
      if (!this._bookmarksBackupIdleTime) {
        this._bookmarksBackupIdleTime = BOOKMARKS_BACKUP_IDLE_TIME_SEC;

        // If there is no backup, or the last bookmarks backup is too old, use
        // a more aggressive idle observer.
        if (lastBackupFile === undefined)
          lastBackupFile = await PlacesBackups.getMostRecentBackup();
        if (!lastBackupFile) {
            this._bookmarksBackupIdleTime /= 2;
        } else {
          let lastBackupTime = PlacesBackups.getDateForFile(lastBackupFile);
          let profileLastUse = Services.appinfo.replacedLockTime || Date.now();

          // If there is a backup after the last profile usage date it's fine,
          // regardless its age.  Otherwise check how old is the last
          // available backup compared to that session.
          if (profileLastUse > lastBackupTime) {
            let backupAge = Math.round((profileLastUse - lastBackupTime) / 86400000);
            // Report the age of the last available backup.
            try {
              Services.telemetry
                      .getHistogramById("PLACES_BACKUPS_DAYSFROMLAST")
                      .add(backupAge);
            } catch (ex) {
              Cu.reportError(new Error("Unable to report telemetry."));
            }

            if (backupAge > BOOKMARKS_BACKUP_MAX_INTERVAL_DAYS)
              this._bookmarksBackupIdleTime /= 2;
          }
        }
        this._idleService.addIdleObserver(this, this._bookmarksBackupIdleTime);
      }
    })().catch(ex => {
      Cu.reportError(ex);
    }).then(() => {
      // NB: deliberately after the catch so that we always do this, even if
      // we threw halfway through initializing in the Task above.
      this._placesBrowserInitComplete = true;
      Services.obs.notifyObservers(null, "places-browser-init-complete");
    });
  },

  /**
   * If a backup for today doesn't exist, this creates one.
   */
  _backupBookmarks: function BG__backupBookmarks() {
    return (async function() {
      let lastBackupFile = await PlacesBackups.getMostRecentBackup();
      // Should backup bookmarks if there are no backups or the maximum
      // interval between backups elapsed.
      if (!lastBackupFile ||
          new Date() - PlacesBackups.getDateForFile(lastBackupFile) > BOOKMARKS_BACKUP_MIN_INTERVAL_DAYS * 86400000) {
        let maxBackups = Services.prefs.getIntPref("browser.bookmarks.max_backups");
        await PlacesBackups.create(maxBackups);
      }
    })();
  },

  /**
   * Show the notificationBox for a locked places database.
   */
  _showPlacesLockedNotificationBox: function BG__showPlacesLockedNotificationBox() {
    var applicationName = gBrandBundle.GetStringFromName("brandShortName");
    var placesBundle = Services.strings.createBundle("chrome://browser/locale/places/places.properties");
    var title = placesBundle.GetStringFromName("lockPrompt.title");
    var text = placesBundle.formatStringFromName("lockPrompt.text", [applicationName], 1);
    var buttonText = placesBundle.GetStringFromName("lockPromptInfoButton.label");
    var accessKey = placesBundle.GetStringFromName("lockPromptInfoButton.accessKey");

    var helpTopic = "places-locked";
    var url = Services.urlFormatter.formatURLPref("app.support.baseURL");
    url += helpTopic;

    var win = BrowserWindowTracker.getTopWindow();

    var buttons = [
                    {
                      label:     buttonText,
                      accessKey,
                      popup:     null,
                      callback(aNotificationBar, aButton) {
                        win.openTrustedLinkIn(url, "tab");
                      },
                    },
                  ];

    var notifyBox = win.gBrowser.getNotificationBox();
    var notification = notifyBox.appendNotification(text, title, null,
                                                    notifyBox.PRIORITY_CRITICAL_MEDIUM,
                                                    buttons);
    notification.persistence = -1; // Until user closes it
  },

  _showSyncStartedDoorhanger() {
    let bundle = Services.strings.createBundle("chrome://browser/locale/accounts.properties");
    let productName = gBrandBundle.GetStringFromName("brandShortName");
    let title = bundle.GetStringFromName("syncStartNotification.title");
    let body = bundle.formatStringFromName("syncStartNotification.body2",
                                            [productName], 1);

    let clickCallback = (subject, topic, data) => {
      if (topic != "alertclickcallback")
        return;
      this._openPreferences("sync", { origin: "doorhanger" });
    };
    this.AlertsService.showAlertNotification(null, title, body, true, null, clickCallback);
  },

  /**
   * Uncollapses PersonalToolbar if its collapsed status is not
   * persisted, and user customized it or changed default bookmarks.
   *
   * If the user does not have a persisted value for the toolbar's
   * "collapsed" attribute, try to determine whether it's customized.
   */
  _maybeToggleBookmarkToolbarVisibility() {
    const BROWSER_DOCURL = AppConstants.BROWSER_CHROME_URL;
    const NUM_TOOLBAR_BOOKMARKS_TO_UNHIDE = 3;
    let xulStore = Services.xulStore;

    if (!xulStore.hasValue(BROWSER_DOCURL, "PersonalToolbar", "collapsed")) {
      // We consider the toolbar customized if it has more than NUM_TOOLBAR_BOOKMARKS_TO_UNHIDE
      // children, or if it has a persisted currentset value.
      let toolbarIsCustomized = xulStore.hasValue(BROWSER_DOCURL, "PersonalToolbar", "currentset");
      let getToolbarFolderCount = () => {
        let toolbarFolder = PlacesUtils.getFolderContents(PlacesUtils.bookmarks.toolbarGuid).root;
        let toolbarChildCount = toolbarFolder.childCount;
        toolbarFolder.containerOpen = false;
        return toolbarChildCount;
      };

      if (toolbarIsCustomized || getToolbarFolderCount() > NUM_TOOLBAR_BOOKMARKS_TO_UNHIDE) {
        xulStore.setValue(BROWSER_DOCURL, "PersonalToolbar", "collapsed", "false");
      }
    }
  },

  // eslint-disable-next-line complexity
  _migrateUI: function BG__migrateUI() {
    // Use an increasing number to keep track of the current migration state.
    // Completely unrelated to the current Firefox release number.
    const UI_VERSION = 80;
    const BROWSER_DOCURL = AppConstants.BROWSER_CHROME_URL;

    let currentUIVersion;
    if (Services.prefs.prefHasUserValue("browser.migration.version")) {
      currentUIVersion = Services.prefs.getIntPref("browser.migration.version");
    } else {
      // This is a new profile, nothing to migrate.
      Services.prefs.setIntPref("browser.migration.version", UI_VERSION);

      try {
        // New profiles may have existing bookmarks (imported from another browser or
        // copied into the profile) and we want to show the bookmark toolbar for them
        // in some cases.
        this._maybeToggleBookmarkToolbarVisibility();
      } catch (ex) {
        Cu.reportError(ex);
      }
      return;
    }

    if (currentUIVersion >= UI_VERSION)
      return;

    let xulStore = Services.xulStore;

    if (currentUIVersion < 44) {
      // Merge the various cosmetic animation prefs into one. If any were set to
      // disable animations, we'll disabled cosmetic animations entirely.
      let animate = Services.prefs.getBoolPref("browser.tabs.animate", true) &&
                    Services.prefs.getBoolPref("browser.fullscreen.animate", true) &&
                    !Services.prefs.getBoolPref("alerts.disableSlidingEffect", false);

      Services.prefs.setBoolPref("toolkit.cosmeticAnimations.enabled", animate);

      Services.prefs.clearUserPref("browser.tabs.animate");
      Services.prefs.clearUserPref("browser.fullscreen.animate");
      Services.prefs.clearUserPref("alerts.disableSlidingEffect");
    }

    if (currentUIVersion < 45) {
      const LEGACY_PREF = "browser.shell.skipDefaultBrowserCheck";
      if (Services.prefs.prefHasUserValue(LEGACY_PREF)) {
        Services.prefs.setBoolPref("browser.shell.didSkipDefaultBrowserCheckOnFirstRun",
                                   !Services.prefs.getBoolPref(LEGACY_PREF));
        Services.prefs.clearUserPref(LEGACY_PREF);
      }
    }

    // Version 46 has been replaced by 47
    if (currentUIVersion < 47) {
      // Search suggestions are now on by default.
      // For privacy reasons, we want to respect previously made user's choice
      // regarding the feature, so if it's known reflect that choice into the
      // current pref.
      // Note that in case of downgrade/upgrade we won't guarantee anything.
      try {
        if (Services.prefs.prefHasUserValue("browser.urlbar.searchSuggestionsChoice")) {
          Services.prefs.setBoolPref(
            "browser.urlbar.suggest.searches",
            Services.prefs.getBoolPref("browser.urlbar.searchSuggestionsChoice")
          );
        } else if (Services.prefs.getBoolPref("browser.urlbar.userMadeSearchSuggestionsChoice")) {
          // If the user made a choice but searchSuggestionsChoice is not set,
          // something went wrong in the upgrade path. For example, due to a
          // now fixed bug, some profilespicking "no" at the opt-in bar and
          // upgrading in the same session wouldn't mirror the pref.
          // Users could also lack the mirrored pref due to skipping one version.
          // In this case just fallback to the safest side and disable suggestions.
          Services.prefs.setBoolPref("browser.urlbar.suggest.searches", false);
        }
      } catch (ex) {
        // A missing pref is not a fatal error.
      }
    }

    if (currentUIVersion < 50) {
      try {
        // Transform prefs related to old DevTools Console.
        // The following prefs might be missing when the old DevTools Console
        // front-end is removed.
        // See also: https://bugzilla.mozilla.org/show_bug.cgi?id=1381834
        if (Services.prefs.getBoolPref("devtools.webconsole.filter.networkinfo")) {
          Services.prefs.setBoolPref("devtools.webconsole.filter.net", true);
        }
        if (Services.prefs.getBoolPref("devtools.webconsole.filter.cssparser")) {
          Services.prefs.setBoolPref("devtools.webconsole.filter.css", true);
        }
      } catch (ex) {
        // It's ok if a pref is missing.
      }
    }

    if (currentUIVersion < 51) {
      // Switch to compact UI density if the user is using a formerly compact
      // dark or light theme.
      let currentTheme = Services.prefs.getCharPref("lightweightThemes.selectedThemeID", "");
      if (currentTheme == "firefox-compact-dark@mozilla.org" ||
          currentTheme == "firefox-compact-light@mozilla.org") {
        Services.prefs.setIntPref("browser.uidensity", 1);
      }
    }

    if (currentUIVersion < 52) {
      // Keep old devtools log persistence behavior after splitting netmonitor and
      // webconsole prefs (bug 1307881).
      if (Services.prefs.getBoolPref("devtools.webconsole.persistlog", false)) {
        Services.prefs.setBoolPref("devtools.netmonitor.persistlog", true);
      }
    }

    // Update user customizations that will interfere with the Safe Browsing V2
    // to V4 migration (bug 1395419).
    if (currentUIVersion < 53) {
      const MALWARE_PREF = "urlclassifier.malwareTable";
      if (Services.prefs.prefHasUserValue(MALWARE_PREF)) {
        let malwareList = Services.prefs.getCharPref(MALWARE_PREF);
        if (malwareList.includes("goog-malware-shavar")) {
          malwareList.replace("goog-malware-shavar", "goog-malware-proto");
          Services.prefs.setCharPref(MALWARE_PREF, malwareList);
        }
      }
    }

    // currentUIVersion < 49 and < 54 were originally used for onboarding prefs and
    // have since then been removed and cleared in currentUIVersion < 76

    if (currentUIVersion < 55) {
      Services.prefs.clearUserPref("browser.customizemode.tip0.shown");
    }

    if (currentUIVersion < 56) {
      // Prior to the end of the Firefox 57 cycle, the sidebarcommand being present
      // or not was the only thing that distinguished whether the sidebar was open.
      // Now, the sidebarcommand always indicates the last opened sidebar, and we
      // correctly persist the checked attribute to indicate whether or not the
      // sidebar was open. We should set the checked attribute in case it wasn't:
      if (xulStore.getValue(BROWSER_DOCURL, "sidebar-box", "sidebarcommand")) {
        xulStore.setValue(BROWSER_DOCURL, "sidebar-box", "checked", "true");
      }
    }

    if (currentUIVersion < 57) {
      // Beginning Firefox 57, the theme accent color is shown as highlight
      // on top of tabs. This didn't look too good with the "A Web Browser Renaissance"
      // theme, so we're changing its accent color.
      let lwthemePrefs = Services.prefs.getBranch("lightweightThemes.");
      if (lwthemePrefs.prefHasUserValue("usedThemes")) {
        try {
          let usedThemes = lwthemePrefs.getStringPref("usedThemes");
          usedThemes = JSON.parse(usedThemes);
          let renaissanceTheme = usedThemes.find(theme => theme.id == "recommended-1");
          if (renaissanceTheme) {
            renaissanceTheme.accentcolor = "#834d29";
            lwthemePrefs.setStringPref("usedThemes", JSON.stringify(usedThemes));
          }
        } catch (e) { /* Don't panic if this pref isn't what we expect it to be. */ }
      }
    }

    if (currentUIVersion < 58) {
      // With Firefox 57, we are doing a one time reset of the geo prefs due to bug 1413652
      Services.prefs.clearUserPref("browser.search.countryCode");
      Services.prefs.clearUserPref("browser.search.region");
      Services.prefs.clearUserPref("browser.search.isUS");
    }

    if (currentUIVersion < 59) {
      let searchInitializedPromise = new Promise(resolve => {
        if (Services.search.isInitialized) {
          resolve();
        }
        const SEARCH_SERVICE_TOPIC = "browser-search-service";
        Services.obs.addObserver(function observer(subject, topic, data) {
          if (data != "init-complete") {
            return;
          }
          Services.obs.removeObserver(observer, SEARCH_SERVICE_TOPIC);
          resolve();
        }, SEARCH_SERVICE_TOPIC);
      });
      searchInitializedPromise.then(() => {
        let currentEngine = Services.search.defaultEngine.wrappedJSObject;
        // Only reset the current engine if it wasn't set by a WebExtension
        // and it is not one of the default engines.
        // If the original default is not a default, the user has a weird
        // configuration probably involving langpacks, it's not worth
        // attempting to reset their settings.
        if (currentEngine._extensionID || currentEngine._isDefault ||
            !Services.search.originalDefaultEngine.wrappedJSObject._isDefault)
          return;

        if (currentEngine._loadPath.startsWith("[https]")) {
          Services.prefs.setCharPref("browser.search.reset.status", "pending");
        } else {
          Services.search.resetToOriginalDefaultEngine();
          Services.prefs.setCharPref("browser.search.reset.status", "silent");
        }
      });

      // Migrate the old requested locales prefs to use the new model
      const SELECTED_LOCALE_PREF = "general.useragent.locale";
      const MATCHOS_LOCALE_PREF = "intl.locale.matchOS";

      if (Services.prefs.prefHasUserValue(MATCHOS_LOCALE_PREF) ||
          Services.prefs.prefHasUserValue(SELECTED_LOCALE_PREF)) {
        if (Services.prefs.getBoolPref(MATCHOS_LOCALE_PREF, false)) {
          Services.locale.requestedLocales = [];
        } else {
          let locale = Services.prefs.getComplexValue(SELECTED_LOCALE_PREF,
            Ci.nsIPrefLocalizedString);
          if (locale) {
            try {
              Services.locale.requestedLocales = [locale.data];
            } catch (e) { /* Don't panic if the value is not a valid locale code. */ }
          }
        }
        Services.prefs.clearUserPref(SELECTED_LOCALE_PREF);
        Services.prefs.clearUserPref(MATCHOS_LOCALE_PREF);
      }
    }

    if (currentUIVersion < 61) {
      // Remove persisted toolbarset from navigator toolbox
      xulStore.removeValue(BROWSER_DOCURL, "navigator-toolbox", "toolbarset");
    }

    if (currentUIVersion < 62) {
      // Remove iconsize and mode from all the toolbars
      let toolbars = ["navigator-toolbox", "nav-bar", "PersonalToolbar",
                      "TabsToolbar", "toolbar-menubar"];
      for (let resourceName of ["mode", "iconsize"]) {
        for (let toolbarId of toolbars) {
          xulStore.removeValue(BROWSER_DOCURL, toolbarId, resourceName);
        }
      }
    }

    if (currentUIVersion < 64) {
      OS.File.remove(OS.Path.join(OS.Constants.Path.profileDir,
                                  "directoryLinks.json"), {ignoreAbsent: true});
    }

    if (currentUIVersion < 65 &&
        Services.prefs.getCharPref("general.config.filename", "") == "dsengine.cfg") {
      let searchInitializedPromise = new Promise(resolve => {
        if (Services.search.isInitialized) {
          resolve();
        }
        const SEARCH_SERVICE_TOPIC = "browser-search-service";
        Services.obs.addObserver(function observer(subject, topic, data) {
          if (data != "init-complete") {
            return;
          }
          Services.obs.removeObserver(observer, SEARCH_SERVICE_TOPIC);
          resolve();
        }, SEARCH_SERVICE_TOPIC);
      });
      searchInitializedPromise.then(() => {
        let engineNames = ["Bing Search Engine",
                           "Yahoo! Search Engine",
                           "Yandex Search Engine"];
        for (let engineName of engineNames) {
          let engine = Services.search.getEngineByName(engineName);
          if (engine) {
            Services.search.removeEngine(engine);
          }
        }
      });
    }

    if (currentUIVersion < 66) {
      // Set whether search suggestions or history/bookmarks results come first
      // in the urlbar results, and uninstall a related Shield study.
      this._migrateMatchBucketsPrefForUI66();
    }

    if (currentUIVersion < 67) {
      // Migrate devtools firebug theme users to light theme (bug 1378108):
      if (Services.prefs.getCharPref("devtools.theme") == "firebug") {
        Services.prefs.setCharPref("devtools.theme", "light");
      }
    }

    if (currentUIVersion < 68) {
      // Remove blocklists legacy storage, now relying on IndexedDB.
      OS.File.remove(OS.Path.join(OS.Constants.Path.profileDir,
                                  "kinto.sqlite"), {ignoreAbsent: true});
    }

    if (currentUIVersion < 69) {
      // Clear old social prefs from profile (bug 1460675)
      let socialPrefs = Services.prefs.getBranch("social.");
      if (socialPrefs) {
        let socialPrefsArray = socialPrefs.getChildList("");
        for (let item of socialPrefsArray) {
          Services.prefs.clearUserPref("social." + item);
        }
      }
    }

    if (currentUIVersion < 70) {
      // Migrate old ctrl-tab pref to new one in existing profiles. (This code
      // doesn't run at all in new profiles.)
      Services.prefs.setBoolPref("browser.ctrlTab.recentlyUsedOrder",
        Services.prefs.getBoolPref("browser.ctrlTab.previews", false));
      Services.prefs.clearUserPref("browser.ctrlTab.previews");
      // Remember that we migrated the pref in case we decide to flip it for
      // these users.
      Services.prefs.setBoolPref("browser.ctrlTab.migrated", true);
    }

    if (currentUIVersion < 71) {
      // Clear legacy saved prefs for content handlers.
      let savedContentHandlers = Services.prefs.getChildList("browser.contentHandlers.types");
      for (let savedHandlerPref of savedContentHandlers) {
        Services.prefs.clearUserPref(savedHandlerPref);
      }
    }

    if (currentUIVersion < 72) {
      // Migrate performance tool's recording interval value from msec to usec.
      let pref = "devtools.performance.recording.interval";
      Services.prefs.setIntPref(pref, Services.prefs.getIntPref(pref, 1) * 1000);
    }

    if (currentUIVersion < 73) {
      // Remove blocklist JSON local dumps in profile.
      OS.File.removeDir(OS.Path.join(OS.Constants.Path.profileDir, "blocklists"),
                        { ignoreAbsent: true });
      OS.File.removeDir(OS.Path.join(OS.Constants.Path.profileDir, "blocklists-preview"),
                        { ignoreAbsent: true });
      for (const filename of ["addons.json", "plugins.json", "gfx.json"]) {
        // Some old versions used to dump without subfolders. Clean them while we are at it.
        const path = OS.Path.join(OS.Constants.Path.profileDir, `blocklists-${filename}`);
        OS.File.remove(path, { ignoreAbsent: true });
      }
    }

    if (currentUIVersion < 75) {
      // Ensure we try to migrate any live bookmarks the user might have, trying up to
      // 5 times. We set this early, and here, to avoid running the migration on
      // new profile (or, indeed, ever creating the pref there).
      Services.prefs.setIntPref("browser.livebookmarks.migrationAttemptsLeft", 5);
    }

    if (currentUIVersion < 76) {
      // Clear old onboarding prefs from profile (bug 1462415)
      let onboardingPrefs = Services.prefs.getBranch("browser.onboarding.");
      if (onboardingPrefs) {
        let onboardingPrefsArray = onboardingPrefs.getChildList("");
        for (let item of onboardingPrefsArray) {
          Services.prefs.clearUserPref("browser.onboarding." + item);
        }
      }
    }

    if (currentUIVersion < 77) {
      // Remove currentset from all the toolbars
      let toolbars = ["nav-bar", "PersonalToolbar", "TabsToolbar", "toolbar-menubar"];
      for (let toolbarId of toolbars) {
        xulStore.removeValue(BROWSER_DOCURL, toolbarId, "currentset");
      }
    }

    if (currentUIVersion < 78) {
      Services.prefs.clearUserPref("browser.search.region");
    }

    if (currentUIVersion < 79) {
      // The handler app service will read this. We need to wait with migrating
      // until the handler service has started up, so just set a pref here.
      Services.prefs.setCharPref("browser.handlers.migrations", "30boxes");
    }

    if (currentUIVersion < 80) {
      let hosts = Services.prefs.getCharPref("network.proxy.no_proxies_on");
      // remove "localhost" and "127.0.0.1" from the no_proxies_on list
      const kLocalHosts = new Set(["localhost", "127.0.0.1"]);
      hosts = hosts.split(/[ ,]+/).filter(host => !kLocalHosts.has(host)).join(", ");
      Services.prefs.setCharPref("network.proxy.no_proxies_on", hosts);
    }

    // Update the migration version.
    Services.prefs.setIntPref("browser.migration.version", UI_VERSION);
  },

  _checkForDefaultBrowser() {
    // Perform default browser checking.
    if (!ShellService) {
      return;
    }

    let shouldCheck = AppConstants.DEBUG ? false :
                                           ShellService.shouldCheckDefaultBrowser;

    const skipDefaultBrowserCheck =
      Services.prefs.getBoolPref("browser.shell.skipDefaultBrowserCheckOnFirstRun") &&
      !Services.prefs.getBoolPref("browser.shell.didSkipDefaultBrowserCheckOnFirstRun");

    const usePromptLimit = !AppConstants.RELEASE_OR_BETA;
    let promptCount =
      usePromptLimit ? Services.prefs.getIntPref("browser.shell.defaultBrowserCheckCount") : 0;

    let willRecoverSession =
      (SessionStartup.sessionType == SessionStartup.RECOVER_SESSION);

    // startup check, check all assoc
    let isDefault = false;
    let isDefaultError = false;
    try {
      isDefault = ShellService.isDefaultBrowser(true, false);
    } catch (ex) {
      isDefaultError = true;
    }

    if (isDefault) {
      let now = (Math.floor(Date.now() / 1000)).toString();
      Services.prefs.setCharPref("browser.shell.mostRecentDateSetAsDefault", now);
    }

    let willPrompt = shouldCheck && !isDefault && !willRecoverSession;

    // Skip the "Set Default Browser" check during first-run or after the
    // browser has been run a few times.
    if (willPrompt) {
      if (skipDefaultBrowserCheck) {
        Services.prefs.setBoolPref("browser.shell.didSkipDefaultBrowserCheckOnFirstRun", true);
        willPrompt = false;
      } else {
        promptCount++;
      }
      if (usePromptLimit && promptCount > 3) {
        willPrompt = false;
      }
    }

    if (usePromptLimit && willPrompt) {
      Services.prefs.setIntPref("browser.shell.defaultBrowserCheckCount", promptCount);
    }

    try {
      // Report default browser status on startup to telemetry
      // so we can track whether we are the default.
      Services.telemetry.getHistogramById("BROWSER_IS_USER_DEFAULT")
                        .add(isDefault);
      Services.telemetry.getHistogramById("BROWSER_IS_USER_DEFAULT_ERROR")
                        .add(isDefaultError);
      Services.telemetry.getHistogramById("BROWSER_SET_DEFAULT_ALWAYS_CHECK")
                        .add(shouldCheck);
      Services.telemetry.getHistogramById("BROWSER_SET_DEFAULT_DIALOG_PROMPT_RAWCOUNT")
                        .add(promptCount);
    } catch (ex) { /* Don't break the default prompt if telemetry is broken. */ }

    if (willPrompt) {
      DefaultBrowserCheck.prompt(BrowserWindowTracker.getTopWindow());
    }
  },

  async _migrateMatchBucketsPrefForUI66() {
    // This does two related things.
    //
    // (1) Profiles created on or after Firefox 57's release date were eligible
    // for a Shield study that changed the browser.urlbar.matchBuckets pref in
    // order to show search suggestions above history/bookmarks in the urlbar
    // popup.  This uninstalls that study.  (It's actually slightly more
    // complex.  The study set the pref to several possible values, but the
    // overwhelming number of profiles in the study got search suggestions
    // first, followed by history/bookmarks.)
    //
    // (2) This also ensures that (a) new users see search suggestions above
    // history/bookmarks, thereby effectively making the study permanent, and
    // (b) old users (including those in the study) continue to see whatever
    // they were seeing before.  This works together with UnifiedComplete.js.
    // By default, the browser.urlbar.matchBuckets pref does not exist, and
    // UnifiedComplete.js internally hardcodes a default value for it.  Before
    // Firefox 60, the hardcoded default was to show history/bookmarks first.
    // After 60, it's to show search suggestions first.

    // Wait for Shield init to complete.
    await new Promise(resolve => {
      if (this._shieldInitComplete) {
        resolve();
        return;
      }
      let topic = "shield-init-complete";
      Services.obs.addObserver(function obs() {
        Services.obs.removeObserver(obs, topic);
        resolve();
      }, topic);
    });

    // Now get the pref's value.  If the study is active, the value will have
    // just been set (on the default branch) as part of Shield's init.  The pref
    // should not exist otherwise (normally).
    let prefName = "browser.urlbar.matchBuckets";
    let prefValue = Services.prefs.getCharPref(prefName, "");

    // Get the study (aka experiment).  It may not be installed.
    let experiment = null;
    let experimentName = "pref-flip-search-composition-57-release-1413565";
    let {PreferenceExperiments} =
      ChromeUtils.import("resource://normandy/lib/PreferenceExperiments.jsm");
    try {
      experiment = await PreferenceExperiments.get(experimentName);
    } catch (e) {}

    // Uninstall the study, resetting the pref to its state before the study.
    if (experiment && !experiment.expired) {
      await PreferenceExperiments.stop(experimentName, {
        resetValue: true,
        reason: "external:search-ui-migration",
      });
    }

    // At this point, normally the pref should not exist.  If it does, then it
    // either has a user value, or something unexpectedly set its value on the
    // default branch.  Either way, preserve that value.
    if (Services.prefs.getCharPref(prefName, "")) {
      return;
    }

    // The new default is "suggestion:4,general:5" (show search suggestions
    // before history/bookmarks), but we implement that by leaving the pref
    // undefined, and UnifiedComplete.js hardcodes that value internally.  So if
    // the pref was "suggestion:4,general:5" (modulo whitespace), we're done.
    if (prefValue) {
      let buckets = PlacesUtils.convertMatchBucketsStringToArray(prefValue);
      if (ObjectUtils.deepEqual(buckets, [["suggestion", 4], ["general", 5]])) {
        return;
      }
    }

    // Set the pref on the user branch.  If the pref had a value, then preserve
    // it.  Otherwise, set the previous default value, which was to show history
    // and bookmarks before search suggestions.
    prefValue = prefValue || "general:5,suggestion:Infinity";
    Services.prefs.setCharPref(prefName, prefValue);
  },

  /**
   * Open preferences even if there are no open windows.
   */
  _openPreferences(...args) {
    if (Services.appShell.hiddenDOMWindow.openPreferences) {
      Services.appShell.hiddenDOMWindow.openPreferences(...args);
      return;
    }

    let chromeWindow = BrowserWindowTracker.getTopWindow();
    chromeWindow.openPreferences(...args);
  },

  _openURLInNewWindow(url) {
    let urlString = Cc["@mozilla.org/supports-string;1"].createInstance(Ci.nsISupportsString);
    urlString.data = url;
    return new Promise(resolve => {
      let win = Services.ww.openWindow(null, AppConstants.BROWSER_CHROME_URL,
                                       "_blank", "chrome,all,dialog=no", urlString);
      win.addEventListener("load", () => { resolve(win); }, {once: true});
    });
  },

  /**
   * Called as an observer when Sync's "display URIs" notification is fired.
   *
   * We open the received URIs in background tabs.
   */
  async _onDisplaySyncURIs(data) {
    try {
      // The payload is wrapped weirdly because of how Sync does notifications.
      const URIs = data.wrappedJSObject.object;

      // win can be null, but it's ok, we'll assign it later in openTab()
      let win = BrowserWindowTracker.getTopWindow({private: false});

      const openTab = async (URI) => {
        let tab;
        if (!win) {
          win = await this._openURLInNewWindow(URI.uri);
          let tabs = win.gBrowser.tabs;
          tab = tabs[tabs.length - 1];
        } else {
          tab = win.gBrowser.addWebTab(URI.uri);
        }
        tab.setAttribute("attention", true);
        return tab;
      };

      const firstTab = await openTab(URIs[0]);
      await Promise.all(URIs.slice(1).map(URI => openTab(URI)));

      let title, body;
      const deviceName = URIs[0].sender.name;
      const bundle = Services.strings.createBundle("chrome://browser/locale/accounts.properties");
      if (URIs.length == 1) {
        // Due to bug 1305895, tabs from iOS may not have device information, so
        // we have separate strings to handle those cases. (See Also
        // unnamedTabsArrivingNotificationNoDevice.body below)
        if (deviceName) {
          title = bundle.formatStringFromName("tabArrivingNotificationWithDevice.title", [deviceName], 1);
        } else {
          title = bundle.GetStringFromName("tabArrivingNotification.title");
        }
        // Use the page URL as the body. We strip the fragment and query (after
        // the `?` and `#` respectively) to reduce size, and also format it the
        // same way that the url bar would.
        body = URIs[0].uri.replace(/([?#]).*$/, "$1");
        let wasTruncated = body.length < URIs[0].uri.length;
        if (win.gURLBar) {
          body = win.gURLBar.trimValue(body);
        }
        if (wasTruncated) {
          body = bundle.formatStringFromName("singleTabArrivingWithTruncatedURL.body", [body], 1);
        }
      } else {
        title = bundle.GetStringFromName("multipleTabsArrivingNotification.title");
        const allSameDevice = URIs.every(URI => URI.sender.id == URIs[0].sender.id);
        const unknownDevice = allSameDevice && !deviceName;
        let tabArrivingBody;
        if (unknownDevice) {
          tabArrivingBody = "unnamedTabsArrivingNotificationNoDevice.body";
        } else if (allSameDevice) {
          tabArrivingBody = "unnamedTabsArrivingNotification2.body";
        } else {
          tabArrivingBody = "unnamedTabsArrivingNotificationMultiple2.body";
        }

        body = bundle.GetStringFromName(tabArrivingBody);
        body = PluralForm.get(URIs.length, body);
        body = body.replace("#1", URIs.length);
        body = body.replace("#2", deviceName);
      }

      const clickCallback = (obsSubject, obsTopic, obsData) => {
        if (obsTopic == "alertclickcallback") {
          win.gBrowser.selectedTab = firstTab;
        }
      };

      // Specify an icon because on Windows no icon is shown at the moment
      let imageURL;
      if (AppConstants.platform == "win") {
        imageURL = "chrome://branding/content/icon64.png";
      }
      this.AlertsService.showAlertNotification(imageURL, title, body, true, null, clickCallback);
    } catch (ex) {
      Cu.reportError("Error displaying tab(s) received by Sync: " + ex);
    }
  },

  async _onVerifyLoginNotification({body, title, url}) {
    let tab;
    let imageURL;
    if (AppConstants.platform == "win") {
      imageURL = "chrome://branding/content/icon64.png";
    }
    let win = BrowserWindowTracker.getTopWindow({private: false});
    if (!win) {
      win = await this._openURLInNewWindow(url);
      let tabs = win.gBrowser.tabs;
      tab = tabs[tabs.length - 1];
    } else {
      tab = win.gBrowser.addWebTab(url);
    }
    tab.setAttribute("attention", true);
    let clickCallback = (subject, topic, data) => {
      if (topic != "alertclickcallback")
        return;
      win.gBrowser.selectedTab = tab;
    };

    try {
      this.AlertsService.showAlertNotification(imageURL, title, body, true, null, clickCallback);
    } catch (ex) {
      Cu.reportError("Error notifying of a verify login event: " + ex);
    }
  },

  _onDeviceConnected(deviceName) {
    let accountsBundle = Services.strings.createBundle(
      "chrome://browser/locale/accounts.properties"
    );
    let title = accountsBundle.GetStringFromName("deviceConnectedTitle");
    let body = accountsBundle.formatStringFromName("deviceConnectedBody" +
                                                   (deviceName ? "" : ".noDeviceName"),
                                                   [deviceName], 1);

    let clickCallback = async (subject, topic, data) => {
      if (topic != "alertclickcallback")
        return;
      let url = await FxAccounts.config.promiseManageDevicesURI("device-connected-notification");
      let win = BrowserWindowTracker.getTopWindow({private: false});
      if (!win) {
        this._openURLInNewWindow(url);
      } else {
        win.gBrowser.addWebTab(url);
      }
    };

    try {
      this.AlertsService.showAlertNotification(null, title, body, true, null, clickCallback);
    } catch (ex) {
      Cu.reportError("Error notifying of a new Sync device: " + ex);
    }
  },

  _onDeviceDisconnected() {
    let bundle = Services.strings.createBundle("chrome://browser/locale/accounts.properties");
    let title = bundle.GetStringFromName("deviceDisconnectedNotification.title");
    let body = bundle.GetStringFromName("deviceDisconnectedNotification.body");

    let clickCallback = (subject, topic, data) => {
      if (topic != "alertclickcallback")
        return;
      this._openPreferences("sync", { origin: "devDisconnectedAlert"});
    };
    this.AlertsService.showAlertNotification(null, title, body, true, null, clickCallback);
  },

  _handleFlashHang() {
    ++this._flashHangCount;
    if (this._flashHangCount < 2) {
      return;
    }
    // protected mode only applies to win32
    if (Services.appinfo.XPCOMABI != "x86-msvc") {
      return;
    }

    if (Services.prefs.getBoolPref("dom.ipc.plugins.flash.disable-protected-mode")) {
      return;
    }
    if (!Services.prefs.getBoolPref("browser.flash-protected-mode-flip.enable")) {
      return;
    }
    if (Services.prefs.getBoolPref("browser.flash-protected-mode-flip.done")) {
      return;
    }
    Services.prefs.setBoolPref("dom.ipc.plugins.flash.disable-protected-mode", true);
    Services.prefs.setBoolPref("browser.flash-protected-mode-flip.done", true);

    let win = BrowserWindowTracker.getTopWindow();
    if (!win) {
      return;
    }
    let productName = gBrandBundle.GetStringFromName("brandShortName");
    let message = win.gNavigatorBundle.
      getFormattedString("flashHang.message", [productName]);
    let buttons = [{
      label: win.gNavigatorBundle.getString("flashHang.helpButton.label"),
      accessKey: win.gNavigatorBundle.getString("flashHang.helpButton.accesskey"),
      callback() {
        win.openTrustedLinkIn("https://support.mozilla.org/kb/flash-protected-mode-autodisabled", "tab");
      },
    }];

    win.gNotificationBox.appendNotification(message, "flash-hang", null,
      win.gNotificationBox.PRIORITY_INFO_MEDIUM, buttons);
  },

  _updateFxaBadges() {
    let state = UIState.get();
    if (state.status == UIState.STATUS_LOGIN_FAILED ||
        state.status == UIState.STATUS_NOT_VERIFIED) {
      AppMenuNotifications.showBadgeOnlyNotification("fxa-needs-authentication");
    } else {
      AppMenuNotifications.removeNotification("fxa-needs-authentication");
    }
  },

  QueryInterface: ChromeUtils.generateQI([Ci.nsIObserver,
                                          Ci.nsISupportsWeakReference]),
};

var ContentBlockingCategoriesPrefs = {
  PREF_CB_CATEGORY: "browser.contentblocking.category",
  // The prefs inside CATEGORY_PREFS set expected value for each CB category.
  // A null value means that pref is default.
  CATEGORY_PREFS: {
    strict: [
      ["urlclassifier.trackingTable", null],
      ["network.cookie.cookieBehavior", Ci.nsICookieService.BEHAVIOR_REJECT_TRACKER],
      ["privacy.trackingprotection.pbmode.enabled", true],
      ["privacy.trackingprotection.enabled", true],
      ["privacy.trackingprotection.fingerprinting.enabled", null],
      ["privacy.trackingprotection.cryptomining.enabled", null],
    ],
    standard: [
      ["urlclassifier.trackingTable", null],
      ["network.cookie.cookieBehavior", null],
      ["privacy.trackingprotection.pbmode.enabled", null],
      ["privacy.trackingprotection.enabled", null],
      ["privacy.trackingprotection.fingerprinting.enabled", null],
      ["privacy.trackingprotection.cryptomining.enabled", null],
    ],
  },
  switchingCategory: false,

  /**
   * Checks if CB prefs match perfectly with one of our pre-defined categories.
   */
  prefsMatch(category) {
    // The category pref must be either unset, or match.
    if (Services.prefs.prefHasUserValue(this.PREF_CB_CATEGORY) &&
        Services.prefs.getStringPref(this.PREF_CB_CATEGORY) != category) {
      return false;
    }
    for (let [pref, value] of this.CATEGORY_PREFS[category]) {
      if (!value) {
        if (Services.prefs.prefHasUserValue(pref)) {
          return false;
        }
      } else {
        let prefType = Services.prefs.getPrefType(pref);
        if ((prefType == Services.prefs.PREF_BOOL && Services.prefs.getBoolPref(pref) != value) ||
            (prefType == Services.prefs.PREF_INT && Services.prefs.getIntPref(pref) != value) ||
            (prefType == Services.prefs.PREF_STRING && Services.prefs.getStringPref(pref) != value)) {
          return false;
        }
      }
    }
    return true;
  },

  matchCBCategory() {
    if (this.switchingCategory) {
      return;
    }
    // If PREF_CB_CATEGORY is not set match users to a Content Blocking category. Check if prefs fit
    // perfectly into strict or standard, otherwise match with custom. If PREF_CB_CATEGORY has previously been set,
    // a change of one of these prefs necessarily puts us in "custom".
    if (this.prefsMatch("standard")) {
      Services.prefs.setStringPref(this.PREF_CB_CATEGORY, "standard");
    } else if (this.prefsMatch("strict")) {
      Services.prefs.setStringPref(this.PREF_CB_CATEGORY, "strict");
    } else {
      Services.prefs.setStringPref(this.PREF_CB_CATEGORY, "custom");
    }

    // If there is a custom policy which changes a related pref, then put the user in custom so
    // they still have access to other content blocking prefs, and to keep our default definitions
    // from changing.
    let policy = Services.policies.getActivePolicies();
    if (policy && (policy.EnableTrackingProtection ||
        policy.Cookies)) {
      Services.prefs.setStringPref(this.PREF_CB_CATEGORY, "custom");
    }
  },

  updateCBCategory() {
    if (this.switchingCategory || !Services.prefs.prefHasUserValue(this.PREF_CB_CATEGORY)) {
      return;
    }
    // Turn on switchingCategory flag, to ensure that when the individual prefs that change as a result
    // of the category change do not trigger yet another category change.
    this.switchingCategory = true;
    let value = Services.prefs.getStringPref(this.PREF_CB_CATEGORY);
    this.setPrefsToCategory(value);
    this.switchingCategory = false;
  },

  /**
   * Sets all user-exposed content blocking preferences to values that match the selected category.
   */
  setPrefsToCategory(category) {
    // Leave prefs as they were if we are switching to "custom" category.
    if (category == "custom") {
      return;
    }

    for (let [pref, value] of this.CATEGORY_PREFS[category]) {
      if (!Services.prefs.prefIsLocked(pref)) {
        if (!value) {
          Services.prefs.clearUserPref(pref);
        } else {
          switch (Services.prefs.getPrefType(pref)) {
          case Services.prefs.PREF_BOOL:
            Services.prefs.setBoolPref(pref, value);
            break;
          case Services.prefs.PREF_INT:
            Services.prefs.setIntPref(pref, value);
            break;
          case Services.prefs.PREF_STRING:
            Services.prefs.setStringPref(pref, value);
            break;
          }
        }
      }
    }
  },
};

/**
 * ContentPermissionIntegration is responsible for showing the user
 * simple permission prompts when content requests additional
 * capabilities.
 *
 * While there are some built-in permission prompts, createPermissionPrompt
 * can also be overridden by system add-ons or tests to provide new ones.
 *
 * This override ability is provided by Integration.jsm. See
 * PermissionUI.jsm for an example of how to provide a new prompt
 * from an add-on.
 */
const ContentPermissionIntegration = {
  /**
   * Creates a PermissionPrompt for a given permission type and
   * nsIContentPermissionRequest.
   *
   * @param {string} type
   *        The type of the permission request from content. This normally
   *        matches the "type" field of an nsIContentPermissionType, but it
   *        can be something else if the permission does not use the
   *        nsIContentPermissionRequest model. Note that this type might also
   *        be different from the permission key used in the permissions
   *        database.
   *        Example: "geolocation"
   * @param {nsIContentPermissionRequest} request
   *        The request for a permission from content.
   * @return {PermissionPrompt} (see PermissionUI.jsm),
   *         or undefined if the type cannot be handled.
   */
  createPermissionPrompt(type, request) {
    switch (type) {
      case "geolocation": {
        return new PermissionUI.GeolocationPermissionPrompt(request);
      }
      case "desktop-notification": {
        return new PermissionUI.DesktopNotificationPermissionPrompt(request);
      }
      case "persistent-storage": {
        return new PermissionUI.PersistentStoragePermissionPrompt(request);
      }
      case "midi": {
        return new PermissionUI.MIDIPermissionPrompt(request);
      }
      case "storage-access": {
        return new PermissionUI.StorageAccessPermissionPrompt(request);
      }
    }
    return undefined;
  },
};

function ContentPermissionPrompt() {}

ContentPermissionPrompt.prototype = {
  classID:          Components.ID("{d8903bf6-68d5-4e97-bcd1-e4d3012f721a}"),

  QueryInterface: ChromeUtils.generateQI([Ci.nsIContentPermissionPrompt]),

  /**
   * This implementation of nsIContentPermissionPrompt.prompt ensures
   * that there's only one nsIContentPermissionType in the request,
   * and that it's of type nsIContentPermissionType. Failing to
   * satisfy either of these conditions will result in this method
   * throwing NS_ERRORs. If the combined ContentPermissionIntegration
   * cannot construct a prompt for this particular request, an
   * NS_ERROR_FAILURE will be thrown.
   *
   * Any time an error is thrown, the nsIContentPermissionRequest is
   * cancelled automatically.
   *
   * @param {nsIContentPermissionRequest} request
   *        The request that we're to show a prompt for.
   */
  prompt(request) {
    let type;
    try {
      // Only allow exactly one permission request here.
      let types = request.types.QueryInterface(Ci.nsIArray);
      if (types.length != 1) {
        throw Components.Exception(
          "Expected an nsIContentPermissionRequest with only 1 type.",
          Cr.NS_ERROR_UNEXPECTED);
      }

      type = types.queryElementAt(0, Ci.nsIContentPermissionType).type;
      let combinedIntegration =
        Integration.contentPermission.getCombined(ContentPermissionIntegration);

      let permissionPrompt =
        combinedIntegration.createPermissionPrompt(type, request);
      if (!permissionPrompt) {
        throw Components.Exception(
          `Failed to handle permission of type ${type}`,
          Cr.NS_ERROR_FAILURE);
      }

      permissionPrompt.prompt();
    } catch (ex) {
      Cu.reportError(ex);
      request.cancel();
      throw ex;
    }

    let schemeHistogram = Services.telemetry.getKeyedHistogramById("PERMISSION_REQUEST_ORIGIN_SCHEME");
    let scheme = 0;
    try {
      // URI is null for system principals.
      if (request.principal.URI) {
        switch (request.principal.URI.scheme) {
          case "http":
            scheme = 1;
            break;
          case "https":
            scheme = 2;
            break;
        }
      }
    } catch (ex) {
      // If the request principal is not available at this point,
      // the request has likely been cancelled before being shown to the
      // user. We shouldn't record this request.
      if (ex.result != Cr.NS_ERROR_FAILURE) {
        Cu.reportError(ex);
      }
      return;
    }
    schemeHistogram.add(type, scheme);

    // request.element should be the browser element in e10s.
    if (request.element && request.element.contentPrincipal) {
      let thirdPartyHistogram = Services.telemetry.getKeyedHistogramById("PERMISSION_REQUEST_THIRD_PARTY_ORIGIN");
      let isThirdParty = request.principal.origin != request.element.contentPrincipal.origin;
      thirdPartyHistogram.add(type, isThirdParty);
    }

    let userInputHistogram = Services.telemetry.getKeyedHistogramById("PERMISSION_REQUEST_HANDLING_USER_INPUT");
    userInputHistogram.add(type, request.isHandlingUserInput);
  },
};

var DefaultBrowserCheck = {
  get OPTIONPOPUP() { return "defaultBrowserNotificationPopup"; },

  closePrompt(aNode) {
    if (this._notification) {
      this._notification.close();
    }
  },

  setAsDefault() {
    let claimAllTypes = true;
    let setAsDefaultError = false;
    if (AppConstants.platform == "win") {
      try {
        // In Windows 8+, the UI for selecting default protocol is much
        // nicer than the UI for setting file type associations. So we
        // only show the protocol association screen on Windows 8+.
        // Windows 8 is version 6.2.
        let version = Services.sysinfo.getProperty("version");
        claimAllTypes = (parseFloat(version) < 6.2);
      } catch (ex) { }
    }
    try {
      ShellService.setDefaultBrowser(claimAllTypes, false);
    } catch (ex) {
      setAsDefaultError = true;
      Cu.reportError(ex);
    }
    // Here BROWSER_IS_USER_DEFAULT and BROWSER_SET_USER_DEFAULT_ERROR appear
    // to be inverse of each other, but that is only because this function is
    // called when the browser is set as the default. During startup we record
    // the BROWSER_IS_USER_DEFAULT value without recording BROWSER_SET_USER_DEFAULT_ERROR.
    Services.telemetry.getHistogramById("BROWSER_IS_USER_DEFAULT")
                      .add(!setAsDefaultError);
    Services.telemetry.getHistogramById("BROWSER_SET_DEFAULT_ERROR")
                      .add(setAsDefaultError);
  },

  _createPopup(win, notNowStrings, neverStrings) {
    let doc = win.document;
    let popup = doc.createElement("menupopup");
    popup.id = this.OPTIONPOPUP;

    let notNowItem = doc.createElement("menuitem");
    notNowItem.id = "defaultBrowserNotNow";
    notNowItem.setAttribute("label", notNowStrings.label);
    notNowItem.setAttribute("accesskey", notNowStrings.accesskey);
    popup.appendChild(notNowItem);

    let neverItem = doc.createElement("menuitem");
    neverItem.id = "defaultBrowserNever";
    neverItem.setAttribute("label", neverStrings.label);
    neverItem.setAttribute("accesskey", neverStrings.accesskey);
    popup.appendChild(neverItem);

    popup.addEventListener("command", this);

    let popupset = doc.getElementById("mainPopupSet");
    popupset.appendChild(popup);
  },

  handleEvent(event) {
    if (event.type == "command") {
      if (event.target.id == "defaultBrowserNever") {
        ShellService.shouldCheckDefaultBrowser = false;
      }
      this.closePrompt();
    }
  },

  prompt(win) {
    let useNotificationBar = Services.prefs.getBoolPref("browser.defaultbrowser.notificationbar");

    let brandBundle = win.document.getElementById("bundle_brand");
    let brandShortName = brandBundle.getString("brandShortName");

    let shellBundle = win.document.getElementById("bundle_shell");
    let buttonPrefix = "setDefaultBrowser" + (useNotificationBar ? "" : "Alert");
    let yesButton = shellBundle.getFormattedString(buttonPrefix + "Confirm.label",
                                                   [brandShortName]);
    let notNowButton = shellBundle.getString(buttonPrefix + "NotNow.label");

    if (useNotificationBar) {
      let promptMessage = shellBundle.getFormattedString("setDefaultBrowserMessage2",
                                                         [brandShortName]);
      let optionsMessage = shellBundle.getString("setDefaultBrowserOptions.label");
      let optionsKey = shellBundle.getString("setDefaultBrowserOptions.accesskey");

      let neverLabel = shellBundle.getString("setDefaultBrowserNever.label");
      let neverKey = shellBundle.getString("setDefaultBrowserNever.accesskey");

      let yesButtonKey = shellBundle.getString("setDefaultBrowserConfirm.accesskey");
      let notNowButtonKey = shellBundle.getString("setDefaultBrowserNotNow.accesskey");

      this._createPopup(win, {
        label: notNowButton,
        accesskey: notNowButtonKey,
      }, {
        label: neverLabel,
        accesskey: neverKey,
      });

      let buttons = [
        {
          label: yesButton,
          accessKey: yesButtonKey,
          callback: () => {
            this.setAsDefault();
            this.closePrompt();
          },
        },
        {
          label: optionsMessage,
          accessKey: optionsKey,
          popup: this.OPTIONPOPUP,
        },
      ];

      let iconPixels = win.devicePixelRatio > 1 ? "32" : "16";
      let iconURL = "chrome://branding/content/icon" + iconPixels + ".png";
      const priority = win.gHighPriorityNotificationBox.PRIORITY_WARNING_HIGH;
      let callback = this._onNotificationEvent.bind(this);
      this._notification = win.gHighPriorityNotificationBox.appendNotification(
        promptMessage, "default-browser", iconURL, priority, buttons, callback);
    } else {
      // Modal prompt
      let promptTitle = shellBundle.getString("setDefaultBrowserTitle");
      let promptMessage = shellBundle.getFormattedString("setDefaultBrowserMessage",
                                                         [brandShortName]);
      let askLabel = shellBundle.getFormattedString("setDefaultBrowserDontAsk",
                                                    [brandShortName]);

      let ps = Services.prompt;
      let shouldAsk = { value: true };
      let buttonFlags = (ps.BUTTON_TITLE_IS_STRING * ps.BUTTON_POS_0) +
                        (ps.BUTTON_TITLE_IS_STRING * ps.BUTTON_POS_1) +
                        ps.BUTTON_POS_0_DEFAULT;
      let rv = ps.confirmEx(win, promptTitle, promptMessage, buttonFlags,
                            yesButton, notNowButton, null, askLabel, shouldAsk);
      if (rv == 0) {
        this.setAsDefault();
      } else if (!shouldAsk.value) {
        ShellService.shouldCheckDefaultBrowser = false;
      }

      try {
        let resultEnum = rv * 2 + shouldAsk.value;
        Services.telemetry.getHistogramById("BROWSER_SET_DEFAULT_RESULT")
                          .add(resultEnum);
      } catch (ex) { /* Don't break if Telemetry is acting up. */ }
    }
  },

  _onNotificationEvent(eventType) {
    if (eventType == "removed") {
      let doc = this._notification.ownerDocument;
      let popup = doc.getElementById(this.OPTIONPOPUP);
      popup.removeEventListener("command", this);
      popup.remove();
      delete this._notification;
    }
  },
};

/*
 * Prompts users who have an outdated JAWS screen reader informing
 * them they need to update JAWS or switch to esr. Can be removed
 * 12/31/2018.
 */
var JawsScreenReaderVersionCheck = {
  _prompted: false,

  init() {
    Services.obs.addObserver(this, "a11y-init-or-shutdown", true);
  },

  QueryInterface: ChromeUtils.generateQI([Ci.nsIObserver, Ci.nsISupportsWeakReference]),

  observe(subject, topic, data) {
    if (topic == "a11y-init-or-shutdown" && data == "1") {
      Services.tm.dispatchToMainThread(() => this._checkVersionAndPrompt());
    }
  },

  onWindowsRestored() {
    Services.tm.dispatchToMainThread(() => this._checkVersionAndPrompt());
  },

  _checkVersionAndPrompt() {
    // Make sure we only prompt for versions of JAWS we do not
    // support and never prompt if e10s is disabled or if we're on
    // nightly.
    if (!Services.appinfo.shouldBlockIncompatJaws ||
        !Services.appinfo.browserTabsRemoteAutostart ||
        AppConstants.NIGHTLY_BUILD) {
      return;
    }

    let win = BrowserWindowTracker.getTopWindow();
    if (!win || !win.gBrowser || !win.gBrowser.selectedBrowser) {
      Services.console.logStringMessage(
          "Content access support for older versions of JAWS is disabled " +
          "due to compatibility issues with this version of Firefox.");
      this._prompted = false;
      return;
    }

    // Only prompt once per session
    if (this._prompted) {
      return;
    }
    this._prompted = true;

    let browser = win.gBrowser.selectedBrowser;

    // Prompt JAWS users to let them know they need to update
    let promptMessage = win.gNavigatorBundle.getFormattedString(
                          "e10s.accessibilityNotice.jawsMessage",
                          [gBrandBundle.GetStringFromName("brandShortName")]
                        );
    let notification;
    // main option: an Ok button, keeps running with content accessibility disabled
    let mainAction = {
      label: win.gNavigatorBundle.getString("e10s.accessibilityNotice.acceptButton.label"),
      accessKey: win.gNavigatorBundle.getString("e10s.accessibilityNotice.acceptButton.accesskey"),
      callback() {
        // If the user invoked the button option remove the notification,
        // otherwise keep the alert icon around in the address bar.
        notification.remove();
      },
    };
    let options = {
      popupIconURL: "chrome://browser/skin/e10s-64@2x.png",
      persistWhileVisible: true,
      persistent: true,
      persistence: 100,
    };

    notification =
      win.PopupNotifications.show(browser, "e10s_enabled_with_incompat_jaws",
                                  promptMessage, null, mainAction,
                                  null, options);
  },
};

// Listen for UITour messages.
// Do it here instead of the UITour module itself so that the UITour module is lazy loaded
// when the first message is received.
Services.mm.addMessageListener("UITour:onPageEvent", function(aMessage) {
  UITour.onPageEvent(aMessage, aMessage.data);
});

// Listen for HybridContentTelemetry messages.
// Do it here instead of HybridContentTelemetry.init() so that
// the module can be lazily loaded on the first message.
Services.mm.addMessageListener("HybridContentTelemetry:onTelemetryMessage", aMessage => {
  HybridContentTelemetry.onTelemetryMessage(aMessage, aMessage.data);
});