Add m-esr52 at 52.6.0

1 files changed, 758 insertions, 0 deletions

diff --git a/devtools/client/framework/devtools-browser.js b/devtools/client/framework/devtools-browser.js
new file mode 100644
index 000000000..b9f4d92ba
--- /dev/null
+++ b/devtools/client/framework/devtools-browser.js
@@ -0,0 +1,758 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/**
+ * This is the main module loaded in Firefox desktop that handles browser
+ * windows and coordinates devtools around each window.
+ *
+ * This module is loaded lazily by devtools-clhandler.js, once the first
+ * browser window is ready (i.e. fired browser-delayed-startup-finished event)
+ **/
+
+const {Cc, Ci, Cu} = require("chrome");
+const Services = require("Services");
+const promise = require("promise");
+const defer = require("devtools/shared/defer");
+const Telemetry = require("devtools/client/shared/telemetry");
+const { gDevTools } = require("./devtools");
+const { when: unload } = require("sdk/system/unload");
+
+// Load target and toolbox lazily as they need gDevTools to be fully initialized
+loader.lazyRequireGetter(this, "TargetFactory", "devtools/client/framework/target", true);
+loader.lazyRequireGetter(this, "Toolbox", "devtools/client/framework/toolbox", true);
+loader.lazyRequireGetter(this, "DebuggerServer", "devtools/server/main", true);
+loader.lazyRequireGetter(this, "DebuggerClient", "devtools/shared/client/main", true);
+loader.lazyRequireGetter(this, "BrowserMenus", "devtools/client/framework/browser-menus");
+
+loader.lazyImporter(this, "CustomizableUI", "resource:///modules/CustomizableUI.jsm");
+loader.lazyImporter(this, "AppConstants", "resource://gre/modules/AppConstants.jsm");
+
+const {LocalizationHelper} = require("devtools/shared/l10n");
+const L10N = new LocalizationHelper("devtools/client/locales/toolbox.properties");
+
+const TABS_OPEN_PEAK_HISTOGRAM = "DEVTOOLS_TABS_OPEN_PEAK_LINEAR";
+const TABS_OPEN_AVG_HISTOGRAM = "DEVTOOLS_TABS_OPEN_AVERAGE_LINEAR";
+const TABS_PINNED_PEAK_HISTOGRAM = "DEVTOOLS_TABS_PINNED_PEAK_LINEAR";
+const TABS_PINNED_AVG_HISTOGRAM = "DEVTOOLS_TABS_PINNED_AVERAGE_LINEAR";
+
+/**
+ * gDevToolsBrowser exposes functions to connect the gDevTools instance with a
+ * Firefox instance.
+ */
+var gDevToolsBrowser = exports.gDevToolsBrowser = {
+  /**
+   * A record of the windows whose menus we altered, so we can undo the changes
+   * as the window is closed
+   */
+  _trackedBrowserWindows: new Set(),
+
+  _telemetry: new Telemetry(),
+
+  _tabStats: {
+    peakOpen: 0,
+    peakPinned: 0,
+    histOpen: [],
+    histPinned: []
+  },
+
+  /**
+   * This function is for the benefit of Tools:DevToolbox in
+   * browser/base/content/browser-sets.inc and should not be used outside
+   * of there
+   */
+  // used by browser-sets.inc, command
+  toggleToolboxCommand: function (gBrowser) {
+    let target = TargetFactory.forTab(gBrowser.selectedTab);
+    let toolbox = gDevTools.getToolbox(target);
+
+    // If a toolbox exists, using toggle from the Main window :
+    // - should close a docked toolbox
+    // - should focus a windowed toolbox
+    let isDocked = toolbox && toolbox.hostType != Toolbox.HostType.WINDOW;
+    isDocked ? gDevTools.closeToolbox(target) : gDevTools.showToolbox(target);
+  },
+
+  /**
+   * This function ensures the right commands are enabled in a window,
+   * depending on their relevant prefs. It gets run when a window is registered,
+   * or when any of the devtools prefs change.
+   */
+  updateCommandAvailability: function (win) {
+    let doc = win.document;
+
+    function toggleMenuItem(id, isEnabled) {
+      let cmd = doc.getElementById(id);
+      if (isEnabled) {
+        cmd.removeAttribute("disabled");
+        cmd.removeAttribute("hidden");
+      } else {
+        cmd.setAttribute("disabled", "true");
+        cmd.setAttribute("hidden", "true");
+      }
+    }
+
+    // Enable developer toolbar?
+    let devToolbarEnabled = Services.prefs.getBoolPref("devtools.toolbar.enabled");
+    toggleMenuItem("menu_devToolbar", devToolbarEnabled);
+    let focusEl = doc.getElementById("menu_devToolbar");
+    if (devToolbarEnabled) {
+      focusEl.removeAttribute("disabled");
+    } else {
+      focusEl.setAttribute("disabled", "true");
+    }
+    if (devToolbarEnabled && Services.prefs.getBoolPref("devtools.toolbar.visible")) {
+      win.DeveloperToolbar.show(false).catch(console.error);
+    }
+
+    // Enable WebIDE?
+    let webIDEEnabled = Services.prefs.getBoolPref("devtools.webide.enabled");
+    toggleMenuItem("menu_webide", webIDEEnabled);
+
+    let showWebIDEWidget = Services.prefs.getBoolPref("devtools.webide.widget.enabled");
+    if (webIDEEnabled && showWebIDEWidget) {
+      gDevToolsBrowser.installWebIDEWidget();
+    } else {
+      gDevToolsBrowser.uninstallWebIDEWidget();
+    }
+
+    // Enable Browser Toolbox?
+    let chromeEnabled = Services.prefs.getBoolPref("devtools.chrome.enabled");
+    let devtoolsRemoteEnabled = Services.prefs.getBoolPref("devtools.debugger.remote-enabled");
+    let remoteEnabled = chromeEnabled && devtoolsRemoteEnabled;
+    toggleMenuItem("menu_browserToolbox", remoteEnabled);
+    toggleMenuItem("menu_browserContentToolbox", remoteEnabled && win.gMultiProcessBrowser);
+
+    // Enable DevTools connection screen, if the preference allows this.
+    toggleMenuItem("menu_devtools_connect", devtoolsRemoteEnabled);
+  },
+
+  observe: function (subject, topic, prefName) {
+    switch (topic) {
+      case "browser-delayed-startup-finished":
+        this._registerBrowserWindow(subject);
+        break;
+      case "nsPref:changed":
+        if (prefName.endsWith("enabled")) {
+          for (let win of this._trackedBrowserWindows) {
+            this.updateCommandAvailability(win);
+          }
+        }
+        break;
+    }
+  },
+
+  _prefObserverRegistered: false,
+
+  ensurePrefObserver: function () {
+    if (!this._prefObserverRegistered) {
+      this._prefObserverRegistered = true;
+      Services.prefs.addObserver("devtools.", this, false);
+    }
+  },
+
+  /**
+   * This function is for the benefit of Tools:{toolId} commands,
+   * triggered from the WebDeveloper menu and keyboard shortcuts.
+   *
+   * selectToolCommand's behavior:
+   * - if the toolbox is closed,
+   *   we open the toolbox and select the tool
+   * - if the toolbox is open, and the targeted tool is not selected,
+   *   we select it
+   * - if the toolbox is open, and the targeted tool is selected,
+   *   and the host is NOT a window, we close the toolbox
+   * - if the toolbox is open, and the targeted tool is selected,
+   *   and the host is a window, we raise the toolbox window
+   */
+  // Used when: - registering a new tool
+  //            - new xul window, to add menu items
+  selectToolCommand: function (gBrowser, toolId) {
+    let target = TargetFactory.forTab(gBrowser.selectedTab);
+    let toolbox = gDevTools.getToolbox(target);
+    let toolDefinition = gDevTools.getToolDefinition(toolId);
+
+    if (toolbox &&
+        (toolbox.currentToolId == toolId ||
+          (toolId == "webconsole" && toolbox.splitConsole)))
+    {
+      toolbox.fireCustomKey(toolId);
+
+      if (toolDefinition.preventClosingOnKey || toolbox.hostType == Toolbox.HostType.WINDOW) {
+        toolbox.raise();
+      } else {
+        gDevTools.closeToolbox(target);
+      }
+      gDevTools.emit("select-tool-command", toolId);
+    } else {
+      gDevTools.showToolbox(target, toolId).then(() => {
+        let target = TargetFactory.forTab(gBrowser.selectedTab);
+        let toolbox = gDevTools.getToolbox(target);
+
+        toolbox.fireCustomKey(toolId);
+        gDevTools.emit("select-tool-command", toolId);
+      });
+    }
+  },
+
+  /**
+   * Open a tab on "about:debugging", optionally pre-select a given tab.
+   */
+   // Used by browser-sets.inc, command
+  openAboutDebugging: function (gBrowser, hash) {
+    let url = "about:debugging" + (hash ? "#" + hash : "");
+    gBrowser.selectedTab = gBrowser.addTab(url);
+  },
+
+  /**
+   * Open a tab to allow connects to a remote browser
+   */
+   // Used by browser-sets.inc, command
+  openConnectScreen: function (gBrowser) {
+    gBrowser.selectedTab = gBrowser.addTab("chrome://devtools/content/framework/connect/connect.xhtml");
+  },
+
+  /**
+   * Open WebIDE
+   */
+   // Used by browser-sets.inc, command
+   //         itself, webide widget
+  openWebIDE: function () {
+    let win = Services.wm.getMostRecentWindow("devtools:webide");
+    if (win) {
+      win.focus();
+    } else {
+      Services.ww.openWindow(null, "chrome://webide/content/", "webide", "chrome,centerscreen,resizable", null);
+    }
+  },
+
+  _getContentProcessTarget: function (processId) {
+    // Create a DebuggerServer in order to connect locally to it
+    if (!DebuggerServer.initialized) {
+      DebuggerServer.init();
+      DebuggerServer.addBrowserActors();
+    }
+    DebuggerServer.allowChromeProcess = true;
+
+    let transport = DebuggerServer.connectPipe();
+    let client = new DebuggerClient(transport);
+
+    let deferred = defer();
+    client.connect().then(() => {
+      client.getProcess(processId)
+            .then(response => {
+              let options = {
+                form: response.form,
+                client: client,
+                chrome: true,
+                isTabActor: false
+              };
+              return TargetFactory.forRemoteTab(options);
+            })
+            .then(target => {
+              // Ensure closing the connection in order to cleanup
+              // the debugger client and also the server created in the
+              // content process
+              target.on("close", () => {
+                client.close();
+              });
+              deferred.resolve(target);
+            });
+    });
+
+    return deferred.promise;
+  },
+
+   // Used by menus.js
+  openContentProcessToolbox: function (gBrowser) {
+    let { childCount } = Services.ppmm;
+    // Get the process message manager for the current tab
+    let mm = gBrowser.selectedBrowser.messageManager.processMessageManager;
+    let processId = null;
+    for (let i = 1; i < childCount; i++) {
+      let child = Services.ppmm.getChildAt(i);
+      if (child == mm) {
+        processId = i;
+        break;
+      }
+    }
+    if (processId) {
+      this._getContentProcessTarget(processId)
+          .then(target => {
+            // Display a new toolbox, in a new window, with debugger by default
+            return gDevTools.showToolbox(target, "jsdebugger",
+                                         Toolbox.HostType.WINDOW);
+          });
+    } else {
+      let msg = L10N.getStr("toolbox.noContentProcessForTab.message");
+      Services.prompt.alert(null, "", msg);
+    }
+  },
+
+  /**
+   * Install Developer widget
+   */
+  installDeveloperWidget: function () {
+    let id = "developer-button";
+    let widget = CustomizableUI.getWidget(id);
+    if (widget && widget.provider == CustomizableUI.PROVIDER_API) {
+      return;
+    }
+    CustomizableUI.createWidget({
+      id: id,
+      type: "view",
+      viewId: "PanelUI-developer",
+      shortcutId: "key_devToolboxMenuItem",
+      tooltiptext: "developer-button.tooltiptext2",
+      defaultArea: AppConstants.MOZ_DEV_EDITION ?
+                     CustomizableUI.AREA_NAVBAR :
+                     CustomizableUI.AREA_PANEL,
+      onViewShowing: function (aEvent) {
+        // Populate the subview with whatever menuitems are in the developer
+        // menu. We skip menu elements, because the menu panel has no way
+        // of dealing with those right now.
+        let doc = aEvent.target.ownerDocument;
+        let win = doc.defaultView;
+
+        let menu = doc.getElementById("menuWebDeveloperPopup");
+
+        let itemsToDisplay = [...menu.children];
+        // Hardcode the addition of the "work offline" menuitem at the bottom:
+        itemsToDisplay.push({localName: "menuseparator", getAttribute: () => {}});
+        itemsToDisplay.push(doc.getElementById("goOfflineMenuitem"));
+
+        let developerItems = doc.getElementById("PanelUI-developerItems");
+        // Import private helpers from CustomizableWidgets
+        let { clearSubview, fillSubviewFromMenuItems } =
+          Cu.import("resource:///modules/CustomizableWidgets.jsm", {});
+        clearSubview(developerItems);
+        fillSubviewFromMenuItems(itemsToDisplay, developerItems);
+      },
+      onBeforeCreated: function (doc) {
+        // Bug 1223127, CUI should make this easier to do.
+        if (doc.getElementById("PanelUI-developerItems")) {
+          return;
+        }
+        let view = doc.createElement("panelview");
+        view.id = "PanelUI-developerItems";
+        let panel = doc.createElement("vbox");
+        panel.setAttribute("class", "panel-subview-body");
+        view.appendChild(panel);
+        doc.getElementById("PanelUI-multiView").appendChild(view);
+      }
+    });
+  },
+
+  /**
+   * Install WebIDE widget
+   */
+  // Used by itself
+  installWebIDEWidget: function () {
+    if (this.isWebIDEWidgetInstalled()) {
+      return;
+    }
+
+    let defaultArea;
+    if (Services.prefs.getBoolPref("devtools.webide.widget.inNavbarByDefault")) {
+      defaultArea = CustomizableUI.AREA_NAVBAR;
+    } else {
+      defaultArea = CustomizableUI.AREA_PANEL;
+    }
+
+    CustomizableUI.createWidget({
+      id: "webide-button",
+      shortcutId: "key_webide",
+      label: "devtools-webide-button2.label",
+      tooltiptext: "devtools-webide-button2.tooltiptext",
+      defaultArea: defaultArea,
+      onCommand: function (aEvent) {
+        gDevToolsBrowser.openWebIDE();
+      }
+    });
+  },
+
+  isWebIDEWidgetInstalled: function () {
+    let widgetWrapper = CustomizableUI.getWidget("webide-button");
+    return !!(widgetWrapper && widgetWrapper.provider == CustomizableUI.PROVIDER_API);
+  },
+
+  /**
+   * The deferred promise will be resolved by WebIDE's UI.init()
+   */
+  isWebIDEInitialized: defer(),
+
+  /**
+   * Uninstall WebIDE widget
+   */
+  uninstallWebIDEWidget: function () {
+    if (this.isWebIDEWidgetInstalled()) {
+      CustomizableUI.removeWidgetFromArea("webide-button");
+    }
+    CustomizableUI.destroyWidget("webide-button");
+  },
+
+  /**
+   * Move WebIDE widget to the navbar
+   */
+   // Used by webide.js
+  moveWebIDEWidgetInNavbar: function () {
+    CustomizableUI.addWidgetToArea("webide-button", CustomizableUI.AREA_NAVBAR);
+  },
+
+  /**
+   * Add this DevTools's presence to a browser window's document
+   *
+   * @param {XULDocument} doc
+   *        The document to which devtools should be hooked to.
+   */
+  _registerBrowserWindow: function (win) {
+    if (gDevToolsBrowser._trackedBrowserWindows.has(win)) {
+      return;
+    }
+    gDevToolsBrowser._trackedBrowserWindows.add(win);
+
+    BrowserMenus.addMenus(win.document);
+
+    // Register the Developer widget in the Hamburger menu or navbar
+    // only once menus are registered as it depends on it.
+    gDevToolsBrowser.installDeveloperWidget();
+
+    // Inject lazily DeveloperToolbar on the chrome window
+    loader.lazyGetter(win, "DeveloperToolbar", function () {
+      let { DeveloperToolbar } = require("devtools/client/shared/developer-toolbar");
+      return new DeveloperToolbar(win);
+    });
+
+    this.updateCommandAvailability(win);
+    this.ensurePrefObserver();
+    win.addEventListener("unload", this);
+
+    let tabContainer = win.gBrowser.tabContainer;
+    tabContainer.addEventListener("TabSelect", this, false);
+    tabContainer.addEventListener("TabOpen", this, false);
+    tabContainer.addEventListener("TabClose", this, false);
+    tabContainer.addEventListener("TabPinned", this, false);
+    tabContainer.addEventListener("TabUnpinned", this, false);
+  },
+
+  /**
+   * Hook the JS debugger tool to the "Debug Script" button of the slow script
+   * dialog.
+   */
+  setSlowScriptDebugHandler: function DT_setSlowScriptDebugHandler() {
+    let debugService = Cc["@mozilla.org/dom/slow-script-debug;1"]
+                         .getService(Ci.nsISlowScriptDebug);
+    let tm = Cc["@mozilla.org/thread-manager;1"].getService(Ci.nsIThreadManager);
+
+    function slowScriptDebugHandler(aTab, aCallback) {
+      let target = TargetFactory.forTab(aTab);
+
+      gDevTools.showToolbox(target, "jsdebugger").then(toolbox => {
+        let threadClient = toolbox.getCurrentPanel().panelWin.gThreadClient;
+
+        // Break in place, which means resuming the debuggee thread and pausing
+        // right before the next step happens.
+        switch (threadClient.state) {
+          case "paused":
+            // When the debugger is already paused.
+            threadClient.resumeThenPause();
+            aCallback();
+            break;
+          case "attached":
+            // When the debugger is already open.
+            threadClient.interrupt(() => {
+              threadClient.resumeThenPause();
+              aCallback();
+            });
+            break;
+          case "resuming":
+            // The debugger is newly opened.
+            threadClient.addOneTimeListener("resumed", () => {
+              threadClient.interrupt(() => {
+                threadClient.resumeThenPause();
+                aCallback();
+              });
+            });
+            break;
+          default:
+            throw Error("invalid thread client state in slow script debug handler: " +
+                        threadClient.state);
+        }
+      });
+    }
+
+    debugService.activationHandler = function (aWindow) {
+      let chromeWindow = aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+                                .getInterface(Ci.nsIWebNavigation)
+                                .QueryInterface(Ci.nsIDocShellTreeItem)
+                                .rootTreeItem
+                                .QueryInterface(Ci.nsIInterfaceRequestor)
+                                .getInterface(Ci.nsIDOMWindow)
+                                .QueryInterface(Ci.nsIDOMChromeWindow);
+
+      let setupFinished = false;
+      slowScriptDebugHandler(chromeWindow.gBrowser.selectedTab,
+                             () => { setupFinished = true; });
+
+      // Don't return from the interrupt handler until the debugger is brought
+      // up; no reason to continue executing the slow script.
+      let utils = aWindow.QueryInterface(Ci.nsIInterfaceRequestor)
+                         .getInterface(Ci.nsIDOMWindowUtils);
+      utils.enterModalState();
+      while (!setupFinished) {
+        tm.currentThread.processNextEvent(true);
+      }
+      utils.leaveModalState();
+    };
+
+    debugService.remoteActivationHandler = function (aBrowser, aCallback) {
+      let chromeWindow = aBrowser.ownerDocument.defaultView;
+      let tab = chromeWindow.gBrowser.getTabForBrowser(aBrowser);
+      chromeWindow.gBrowser.selected = tab;
+
+      function callback() {
+        aCallback.finishDebuggerStartup();
+      }
+
+      slowScriptDebugHandler(tab, callback);
+    };
+  },
+
+  /**
+   * Unset the slow script debug handler.
+   */
+  unsetSlowScriptDebugHandler: function DT_unsetSlowScriptDebugHandler() {
+    let debugService = Cc["@mozilla.org/dom/slow-script-debug;1"]
+                         .getService(Ci.nsISlowScriptDebug);
+    debugService.activationHandler = undefined;
+  },
+
+  /**
+   * Add the menuitem for a tool to all open browser windows.
+   *
+   * @param {object} toolDefinition
+   *        properties of the tool to add
+   */
+  _addToolToWindows: function DT_addToolToWindows(toolDefinition) {
+    // No menu item or global shortcut is required for options panel.
+    if (!toolDefinition.inMenu) {
+      return;
+    }
+
+    // Skip if the tool is disabled.
+    try {
+      if (toolDefinition.visibilityswitch &&
+         !Services.prefs.getBoolPref(toolDefinition.visibilityswitch)) {
+        return;
+      }
+    } catch (e) {}
+
+    // We need to insert the new tool in the right place, which means knowing
+    // the tool that comes before the tool that we're trying to add
+    let allDefs = gDevTools.getToolDefinitionArray();
+    let prevDef;
+    for (let def of allDefs) {
+      if (!def.inMenu) {
+        continue;
+      }
+      if (def === toolDefinition) {
+        break;
+      }
+      prevDef = def;
+    }
+
+    for (let win of gDevToolsBrowser._trackedBrowserWindows) {
+      BrowserMenus.insertToolMenuElements(win.document, toolDefinition, prevDef);
+    }
+
+    if (toolDefinition.id === "jsdebugger") {
+      gDevToolsBrowser.setSlowScriptDebugHandler();
+    }
+  },
+
+  hasToolboxOpened: function (win) {
+    let tab = win.gBrowser.selectedTab;
+    for (let [target, toolbox] of gDevTools._toolboxes) {
+      if (target.tab == tab) {
+        return true;
+      }
+    }
+    return false;
+  },
+
+  /**
+   * Update the "Toggle Tools" checkbox in the developer tools menu. This is
+   * called when a toolbox is created or destroyed.
+   */
+  _updateMenuCheckbox: function DT_updateMenuCheckbox() {
+    for (let win of gDevToolsBrowser._trackedBrowserWindows) {
+
+      let hasToolbox = gDevToolsBrowser.hasToolboxOpened(win);
+
+      let menu = win.document.getElementById("menu_devToolbox");
+      if (hasToolbox) {
+        menu.setAttribute("checked", "true");
+      } else {
+        menu.removeAttribute("checked");
+      }
+    }
+  },
+
+  /**
+   * Remove the menuitem for a tool to all open browser windows.
+   *
+   * @param {string} toolId
+   *        id of the tool to remove
+   */
+  _removeToolFromWindows: function DT_removeToolFromWindows(toolId) {
+    for (let win of gDevToolsBrowser._trackedBrowserWindows) {
+      BrowserMenus.removeToolFromMenu(toolId, win.document);
+    }
+
+    if (toolId === "jsdebugger") {
+      gDevToolsBrowser.unsetSlowScriptDebugHandler();
+    }
+  },
+
+  /**
+   * Called on browser unload to remove menu entries, toolboxes and event
+   * listeners from the closed browser window.
+   *
+   * @param  {XULWindow} win
+   *         The window containing the menu entry
+   */
+  _forgetBrowserWindow: function (win) {
+    if (!gDevToolsBrowser._trackedBrowserWindows.has(win)) {
+      return;
+    }
+    gDevToolsBrowser._trackedBrowserWindows.delete(win);
+    win.removeEventListener("unload", this);
+
+    BrowserMenus.removeMenus(win.document);
+
+    // Destroy toolboxes for closed window
+    for (let [target, toolbox] of gDevTools._toolboxes) {
+      if (toolbox.win.top == win) {
+        toolbox.destroy();
+      }
+    }
+
+    // Destroy the Developer toolbar if it has been accessed
+    let desc = Object.getOwnPropertyDescriptor(win, "DeveloperToolbar");
+    if (desc && !desc.get) {
+      win.DeveloperToolbar.destroy();
+    }
+
+    let tabContainer = win.gBrowser.tabContainer;
+    tabContainer.removeEventListener("TabSelect", this, false);
+    tabContainer.removeEventListener("TabOpen", this, false);
+    tabContainer.removeEventListener("TabClose", this, false);
+    tabContainer.removeEventListener("TabPinned", this, false);
+    tabContainer.removeEventListener("TabUnpinned", this, false);
+  },
+
+  handleEvent: function (event) {
+    switch (event.type) {
+      case "TabOpen":
+      case "TabClose":
+      case "TabPinned":
+      case "TabUnpinned":
+        let open = 0;
+        let pinned = 0;
+
+        for (let win of this._trackedBrowserWindows) {
+          let tabContainer = win.gBrowser.tabContainer;
+          let numPinnedTabs = win.gBrowser._numPinnedTabs || 0;
+          let numTabs = tabContainer.itemCount - numPinnedTabs;
+
+          open += numTabs;
+          pinned += numPinnedTabs;
+        }
+
+        this._tabStats.histOpen.push(open);
+        this._tabStats.histPinned.push(pinned);
+        this._tabStats.peakOpen = Math.max(open, this._tabStats.peakOpen);
+        this._tabStats.peakPinned = Math.max(pinned, this._tabStats.peakPinned);
+        break;
+      case "TabSelect":
+        gDevToolsBrowser._updateMenuCheckbox();
+        break;
+      case "unload":
+        // top-level browser window unload
+        gDevToolsBrowser._forgetBrowserWindow(event.target.defaultView);
+        break;
+    }
+  },
+
+  _pingTelemetry: function () {
+    let mean = function (arr) {
+      if (arr.length === 0) {
+        return 0;
+      }
+
+      let total = arr.reduce((a, b) => a + b);
+      return Math.ceil(total / arr.length);
+    };
+
+    let tabStats = gDevToolsBrowser._tabStats;
+    this._telemetry.log(TABS_OPEN_PEAK_HISTOGRAM, tabStats.peakOpen);
+    this._telemetry.log(TABS_OPEN_AVG_HISTOGRAM, mean(tabStats.histOpen));
+    this._telemetry.log(TABS_PINNED_PEAK_HISTOGRAM, tabStats.peakPinned);
+    this._telemetry.log(TABS_PINNED_AVG_HISTOGRAM, mean(tabStats.histPinned));
+  },
+
+  /**
+   * All browser windows have been closed, tidy up remaining objects.
+   */
+  destroy: function () {
+    Services.prefs.removeObserver("devtools.", gDevToolsBrowser);
+    Services.obs.removeObserver(gDevToolsBrowser, "browser-delayed-startup-finished");
+    Services.obs.removeObserver(gDevToolsBrowser.destroy, "quit-application");
+
+    gDevToolsBrowser._pingTelemetry();
+    gDevToolsBrowser._telemetry = null;
+
+    for (let win of gDevToolsBrowser._trackedBrowserWindows) {
+      gDevToolsBrowser._forgetBrowserWindow(win);
+    }
+  },
+};
+
+// Handle all already registered tools,
+gDevTools.getToolDefinitionArray()
+         .forEach(def => gDevToolsBrowser._addToolToWindows(def));
+// and the new ones.
+gDevTools.on("tool-registered", function (ev, toolId) {
+  let toolDefinition = gDevTools._tools.get(toolId);
+  gDevToolsBrowser._addToolToWindows(toolDefinition);
+});
+
+gDevTools.on("tool-unregistered", function (ev, toolId) {
+  if (typeof toolId != "string") {
+    toolId = toolId.id;
+  }
+  gDevToolsBrowser._removeToolFromWindows(toolId);
+});
+
+gDevTools.on("toolbox-ready", gDevToolsBrowser._updateMenuCheckbox);
+gDevTools.on("toolbox-destroyed", gDevToolsBrowser._updateMenuCheckbox);
+
+Services.obs.addObserver(gDevToolsBrowser.destroy, "quit-application", false);
+Services.obs.addObserver(gDevToolsBrowser, "browser-delayed-startup-finished", false);
+
+// Fake end of browser window load event for all already opened windows
+// that is already fully loaded.
+let enumerator = Services.wm.getEnumerator(gDevTools.chromeWindowType);
+while (enumerator.hasMoreElements()) {
+  let win = enumerator.getNext();
+  if (win.gBrowserInit && win.gBrowserInit.delayedStartupFinished) {
+    gDevToolsBrowser._registerBrowserWindow(win);
+  }
+}
+
+// Watch for module loader unload. Fires when the tools are reloaded.
+unload(function () {
+  gDevToolsBrowser.destroy();
+});