Merge mozilla-central and ux

accessible/tests/mochitest/events/test_focus_general.html

@@ -96,7 +96,7 @@
       gQueue.push(new focusElmWhileSubdocIsFocused("link"));
 
       gQueue.push(new synthTab(editableDoc, new focusChecker(editableDoc)));
-      if (WIN) {
+      if (WIN || LINUX) {
         // Alt key is used to active menubar and focus menu item on Windows,
         // other platforms requires setting a ui.key.menuAccessKeyFocuses
         // preference.

accessible/tests/mochitest/events/test_menu.xul

@@ -156,7 +156,7 @@
       // Alt key is used to active menubar and focus menu item on Windows,
       // other platforms requires setting a ui.key.menuAccessKeyFocuses
       // preference.
-      if (WIN) {
+      if (WIN || LINUX) {
         gQueue.push(new focusFileMenu());
         gQueue.push(new focusEditMenu());
         gQueue.push(new leaveMenubar());

browser/app/profile/firefox.js

@@ -457,11 +457,10 @@ pref("browser.tabs.loadDivertedInBackground", false);
 pref("browser.tabs.loadBookmarksInBackground", false);
 pref("browser.tabs.tabClipWidth", 140);
 pref("browser.tabs.animate", true);
-pref("browser.tabs.onTop", true);
+#ifdef UNIX_BUT_NOT_MAC
-#ifdef XP_WIN
-pref("browser.tabs.drawInTitlebar", true);
-#else
 pref("browser.tabs.drawInTitlebar", false);
+#else
+pref("browser.tabs.drawInTitlebar", true);
 #endif
 
 // Where to show tab close buttons:
@@ -1338,3 +1337,6 @@ pref("geo.wifi.uri", "https://www.googleapis.com/geolocation/v1/geolocate?key=%G
 // Necko IPC security checks only needed for app isolation for cookies/cache/etc:
 // currently irrelevant for desktop e10s
 pref("network.disable.ipc.security", true);
+
+// CustomizableUI debug logging.
+pref("browser.uiCustomization.debug", false);

browser/base/content/browser-addons.js

@@ -178,50 +178,6 @@ const gXPInstallObserver = {
   }
 };
 
-/*
- * When addons are installed/uninstalled, check and see if the number of items
- * on the add-on bar changed:
- * - If an add-on was installed, incrementing the count, show the bar.
- * - If an add-on was uninstalled, and no more items are left, hide the bar.
- */
-let AddonsMgrListener = {
-  get addonBar() document.getElementById("addon-bar"),
-  get statusBar() document.getElementById("status-bar"),
-  getAddonBarItemCount: function() {
-    // Take into account the contents of the status bar shim for the count.
-    var itemCount = this.statusBar.childNodes.length;
-
-    var defaultOrNoninteractive = this.addonBar.getAttribute("defaultset")
-                                      .split(",")
-                                      .concat(["separator", "spacer", "spring"]);
-    for (let item of this.addonBar.currentSet.split(",")) {
-      if (defaultOrNoninteractive.indexOf(item) == -1)
-        itemCount++;
-    }
-
-    return itemCount;
-  },
-  onInstalling: function(aAddon) {
-    this.lastAddonBarCount = this.getAddonBarItemCount();
-  },
-  onInstalled: function(aAddon) {
-    if (this.getAddonBarItemCount() > this.lastAddonBarCount)
-      setToolbarVisibility(this.addonBar, true);
-  },
-  onUninstalling: function(aAddon) {
-    this.lastAddonBarCount = this.getAddonBarItemCount();
-  },
-  onUninstalled: function(aAddon) {
-    if (this.getAddonBarItemCount() == 0)
-      setToolbarVisibility(this.addonBar, false);
-  },
-  onEnabling: function(aAddon) this.onInstalling(),
-  onEnabled: function(aAddon) this.onInstalled(),
-  onDisabling: function(aAddon) this.onUninstalling(),
-  onDisabled: function(aAddon) this.onUninstalled(),
-};
-
-
 var LightWeightThemeWebInstaller = {
   handleEvent: function (event) {
     switch (event.type) {
@@ -415,3 +371,60 @@ var LightWeightThemeWebInstaller = {
                                     node.baseURI);
   }
 }
+
+/*
+ * Listen for Lightweight Theme styling changes and update the browser's theme accordingly.
+ */
+let LightweightThemeListener = {
+  _modifiedStyles: [],
+
+  init: function () {
+    XPCOMUtils.defineLazyGetter(this, "styleSheet", function() {
+      for (let i = document.styleSheets.length - 1; i >= 0; i--) {
+        let sheet = document.styleSheets[i];
+        if (sheet.href == "chrome://browser/skin/browser-lightweightTheme.css")
+          return sheet;
+      }
+    });
+
+    Services.obs.addObserver(this, "lightweight-theme-styling-update", false);
+    if (document.documentElement.hasAttribute("lwtheme"))
+      this.updateStyleSheet(document.documentElement.style.backgroundImage);
+  },
+
+  uninit: function () {
+    Services.obs.removeObserver(this, "lightweight-theme-styling-update");
+  },
+
+  /**
+   * Append the headerImage to the background-image property of all rulesets in
+   * browser-lightweightTheme.css.
+   *
+   * @param headerImage - a string containing a CSS image for the lightweight theme header.
+   */
+  updateStyleSheet: function(headerImage) {
+    if (!this.styleSheet)
+      return;
+    for (let i = 0; i < this.styleSheet.cssRules.length; i++) {
+      let rule = this.styleSheet.cssRules[i];
+      if (!rule.style.backgroundImage)
+        continue;
+
+      if (!this._modifiedStyles[i])
+        this._modifiedStyles[i] = { backgroundImage: rule.style.backgroundImage };
+
+      rule.style.backgroundImage = this._modifiedStyles[i].backgroundImage + ", " + headerImage;
+    }
+  },
+
+  // nsIObserver
+  observe: function (aSubject, aTopic, aData) {
+    if (aTopic != "lightweight-theme-styling-update" || !this.styleSheet)
+      return;
+
+    let themeData = JSON.parse(aData);
+    if (!themeData)
+      return;
+    this.updateStyleSheet("url(" + themeData.headerURL + ")");
+  },
+};

browser/base/content/browser-appmenu.inc

@@ -1,406 +0,0 @@
-# -*- Mode: HTML -*-
-# 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/.
-
-<menupopup id="appmenu-popup"
-           onpopupshowing="if (event.target == this) {
-                             updateEditUIVisibility();
-#ifdef MOZ_SERVICES_SYNC
-                             gSyncUI.updateUI();
-#endif
-                             return;
-                           }
-                           updateCharacterEncodingMenuState();
-                           if (event.target.parentNode.parentNode.parentNode.parentNode == this)
-                             this._currentPopup = event.target;">
-  <hbox>
-    <vbox id="appmenuPrimaryPane">
-      <splitmenu id="appmenu_newTab"
-                 label="&tabCmd.label;"
-                 command="cmd_newNavigatorTab">
-          <menupopup>
-            <menuitem id="appmenu_newTab_popup"
-                      label="&tabCmd.label;"
-                      command="cmd_newNavigatorTab"
-                      key="key_newNavigatorTab"/>
-            <menuitem id="appmenu_newNavigator"
-                      label="&newNavigatorCmd.label;"
-                      command="cmd_newNavigator"
-                      key="key_newNavigator"/>
-            <menuseparator/>
-            <menuitem id="appmenu_openFile"
-                      label="&openFileCmd.label;"
-                      command="Browser:OpenFile"
-                      key="openFileKb"/>
-          </menupopup>
-      </splitmenu>
-      <menuitem id="appmenu_newPrivateWindow"
-                class="menuitem-iconic menuitem-iconic-tooltip"
-                label="&newPrivateWindow.label;"
-                command="Tools:PrivateBrowsing"
-                key="key_privatebrowsing"/>
-      <menuitem label="&goOfflineCmd.label;"
-                id="appmenu_offlineModeRecovery"
-                type="checkbox"
-                observes="workOfflineMenuitemState"
-                oncommand="BrowserOffline.toggleOfflineStatus();"/>
-      <menuseparator class="appmenu-menuseparator"/>
-      <hbox>
-        <menuitem id="appmenu-edit-label"
-                  label="&appMenuEdit.label;"
-                  disabled="true"/>
-        <toolbarbutton id="appmenu-cut"
-                       class="appmenu-edit-button"
-                       command="cmd_cut"
-                       onclick="if (!this.disabled) hidePopup();"
-                       tooltiptext="&cutButton.tooltip;"/>
-        <toolbarbutton id="appmenu-copy"
-                       class="appmenu-edit-button"
-                       command="cmd_copy"
-                       onclick="if (!this.disabled) hidePopup();"
-                       tooltiptext="&copyButton.tooltip;"/>
-        <toolbarbutton id="appmenu-paste"
-                       class="appmenu-edit-button"
-                       command="cmd_paste"
-                       onclick="if (!this.disabled) hidePopup();"
-                       tooltiptext="&pasteButton.tooltip;"/>
-        <spacer flex="1"/>
-        <menu id="appmenu-editmenu">
-          <menupopup id="appmenu-editmenu-menupopup">
-            <menuitem id="appmenu-editmenu-cut"
-                      class="menuitem-iconic"
-                      label="&cutCmd.label;"
-                      key="key_cut"
-                      command="cmd_cut"/>
-            <menuitem id="appmenu-editmenu-copy"
-                      class="menuitem-iconic"
-                      label="&copyCmd.label;"
-                      key="key_copy"
-                      command="cmd_copy"/>
-            <menuitem id="appmenu-editmenu-paste"
-                      class="menuitem-iconic"
-                      label="&pasteCmd.label;"
-                      key="key_paste"
-                      command="cmd_paste"/>
-            <menuseparator/>
-            <menuitem id="appmenu-editmenu-undo"
-                      label="&undoCmd.label;"
-                      key="key_undo"
-                      command="cmd_undo"/>
-            <menuitem id="appmenu-editmenu-redo"
-                      label="&redoCmd.label;"
-                      key="key_redo"
-                      command="cmd_redo"/>
-            <menuseparator/>
-            <menuitem id="appmenu-editmenu-selectAll"
-                      label="&selectAllCmd.label;"
-                      key="key_selectAll"
-                      command="cmd_selectAll"/>
-            <menuseparator/>
-            <menuitem id="appmenu-editmenu-delete"
-                      label="&deleteCmd.label;"
-                      key="key_delete"
-                      command="cmd_delete"/>
-          </menupopup>
-        </menu>
-      </hbox>
-      <menuitem id="appmenu_find"
-                class="menuitem-tooltip"
-                label="&appMenuFind.label;"
-                command="cmd_find"
-                key="key_find"/>
-      <menuseparator class="appmenu-menuseparator"/>
-      <menuitem id="appmenu_savePage"
-                class="menuitem-tooltip"
-                label="&savePageCmd.label;"
-                command="Browser:SavePage"
-                key="key_savePage"/>
-      <menuitem id="appmenu_sendLink"
-                label="&emailPageCmd.label;"
-                command="Browser:SendLink"/>
-      <splitmenu id="appmenu_print"
-                 iconic="true"
-                 label="&printCmd.label;"
-                 command="cmd_print">
-          <menupopup>
-            <menuitem id="appmenu_print_popup"
-                      class="menuitem-iconic"
-                      label="&printCmd.label;"
-                      command="cmd_print"
-                      key="printKb"/>
-            <menuitem id="appmenu_printPreview"
-                      label="&printPreviewCmd.label;"
-                      command="cmd_printPreview"/>
-            <menuitem id="appmenu_printSetup"
-                      label="&printSetupCmd.label;"
-                      command="cmd_pageSetup"/>
-          </menupopup>
-      </splitmenu>
-      <menuseparator class="appmenu-menuseparator"/>
-      <splitmenu id="appmenu_webDeveloper"
-                 command="Tools:DevToolbox"
-                 label="&appMenuWebDeveloper.label;">
-        <menupopup id="appmenu_webDeveloper_popup">
-          <menuitem id="appmenu_devToolbox"
-                    observes="devtoolsMenuBroadcaster_DevToolbox"/>
-          <menuseparator id="appmenu_devtools_separator"/>
-          <menuitem id="appmenu_devToolbar"
-                    observes="devtoolsMenuBroadcaster_DevToolbar"/>
-          <menuitem id="appmenu_devAppMgr"
-                    observes="devtoolsMenuBroadcaster_DevAppMgr"/>
-          <menuitem id="appmenu_chromeDebugger"
-                    observes="devtoolsMenuBroadcaster_ChromeDebugger"/>
-          <menuitem id="appmenu_browserConsole"
-                    observes="devtoolsMenuBroadcaster_BrowserConsole"/>
-          <menuitem id="appmenu_responsiveUI"
-                    observes="devtoolsMenuBroadcaster_ResponsiveUI"/>
-          <menuitem id="appmenu_scratchpad"
-                    observes="devtoolsMenuBroadcaster_Scratchpad"/>
-          <menuitem id="appmenu_pageSource"
-                    observes="devtoolsMenuBroadcaster_PageSource"/>
-          <menuitem id="appmenu_errorConsole"
-                    observes="devtoolsMenuBroadcaster_ErrorConsole"/>
-          <menuitem id="appmenu_devtools_connect"
-                    observes="devtoolsMenuBroadcaster_connect"/>
-          <menuseparator id="appmenu_devToolsEndSeparator"/>
-          <menuitem id="appmenu_getMoreDevtools"
-                    observes="devtoolsMenuBroadcaster_GetMoreTools"/>
-          <menuseparator/>
-#define ID_PREFIX appmenu_developer_
-#define OMIT_ACCESSKEYS
-#include browser-charsetmenu.inc
-#undef ID_PREFIX
-#undef OMIT_ACCESSKEYS
-          <menuitem label="&goOfflineCmd.label;"
-                    type="checkbox"
-                    observes="workOfflineMenuitemState"
-                    oncommand="BrowserOffline.toggleOfflineStatus();"/>
-        </menupopup>
-      </splitmenu>
-      <menuseparator class="appmenu-menuseparator"/>
-#define ID_PREFIX appmenu_
-#define OMIT_ACCESSKEYS
-#include browser-charsetmenu.inc
-#undef ID_PREFIX
-#undef OMIT_ACCESSKEYS
-      <menuitem id="appmenu_fullScreen"
-                class="menuitem-tooltip"
-                label="&fullScreenCmd.label;"
-                type="checkbox"
-                observes="View:FullScreen"
-                key="key_fullScreen"/>
-#ifdef MOZ_SERVICES_SYNC
-      <!-- only one of sync-setup or sync-syncnow will be showing at once -->
-      <menuitem id="sync-setup-appmenu"
-                label="&syncSetup.label;"
-                observes="sync-setup-state"
-                oncommand="gSyncUI.openSetup()"/>
-      <menuitem id="sync-syncnowitem-appmenu"
-                label="&syncSyncNowItem.label;"
-                observes="sync-syncnow-state"
-                oncommand="gSyncUI.doSync(event);"/>
-#endif
-      <menuitem id="appmenu-quit"
-                class="menuitem-iconic"
-#ifdef XP_WIN
-                label="&quitApplicationCmdWin.label;"
-#else
-                label="&quitApplicationCmd.label;"
-#endif
-                command="cmd_quitApplication"/>
-    </vbox>
-    <vbox id="appmenuSecondaryPane">
-      <splitmenu id="appmenu_bookmarks"
-                 iconic="true"
-                 label="&bookmarksMenu.label;"
-                 command="Browser:ShowAllBookmarks">
-          <menupopup id="appmenu_bookmarksPopup"
-                     placespopup="true"
-                     context="placesContext"
-                     openInTabs="children"
-                     oncommand="BookmarksEventHandler.onCommand(event, this.parentNode._placesView);"
-                     onclick="BookmarksEventHandler.onClick(event, this.parentNode._placesView);"
-                     onpopupshowing="BookmarkingUI.onPopupShowing(event);
-                                     if (!this.parentNode._placesView)
-                                       new PlacesMenu(event, 'place:folder=BOOKMARKS_MENU');"
-                     tooltip="bhTooltip"
-                     popupsinherittooltip="true">
-            <menuitem id="appmenu_showAllBookmarks"
-                      label="&showAllBookmarks2.label;"
-                      command="Browser:ShowAllBookmarks"
-                      context=""
-                      key="manBookmarkKb"/>
-            <menuseparator/>
-            <menuitem id="appmenu_bookmarkThisPage"
-                      class="menuitem-iconic"
-                      label="&bookmarkThisPageCmd.label;"
-                      command="Browser:AddBookmarkAs"
-                      key="addBookmarkAsKb"/>
-            <menuitem id="appmenu_subscribeToPage"
-                      class="menuitem-iconic"
-                      label="&subscribeToPageMenuitem.label;"
-                      oncommand="return FeedHandler.subscribeToFeed(null, event);"
-                      onclick="checkForMiddleClick(this, event);"
-                      observes="singleFeedMenuitemState"/>
-            <menu id="appmenu_subscribeToPageMenu"
-                  class="menu-iconic"
-                  label="&subscribeToPageMenupopup.label;"
-                  observes="multipleFeedsMenuState">
-              <menupopup id="appmenu_subscribeToPageMenupopup"
-                         onpopupshowing="return FeedHandler.buildFeedList(event.target);"
-                         oncommand="return FeedHandler.subscribeToFeed(null, event);"
-                         onclick="checkForMiddleClick(this, event);"/>
-            </menu>
-            <menuseparator/>
-            <menu id="appmenu_bookmarksToolbar"
-                  placesanonid="toolbar-autohide"
-                  class="menu-iconic bookmark-item"
-                  label="&personalbarCmd.label;"
-                  container="true">
-              <menupopup id="appmenu_bookmarksToolbarPopup"
-                         placespopup="true"
-                         context="placesContext"
-                         onpopupshowing="if (!this.parentNode._placesView)
-                                           new PlacesMenu(event, 'place:folder=TOOLBAR');"/>
-            </menu>
-            <menuseparator/>
-            <!-- Bookmarks menu items -->
-            <menuseparator builder="end"
-                           class="hide-if-empty-places-result"/>
-            <menuitem id="appmenu_unsortedBookmarks"
-                      label="&appMenuUnsorted.label;"
-                      oncommand="PlacesCommandHook.showPlacesOrganizer('UnfiledBookmarks');"
-                      class="menuitem-iconic"/>
-          </menupopup>
-      </splitmenu>
-      <splitmenu id="appmenu_history"
-                 iconic="true"
-                 label="&historyMenu.label;"
-                 command="Browser:ShowAllHistory">
-          <menupopup id="appmenu_historyMenupopup"
-                     placespopup="true"
-                     oncommand="this.parentNode._placesView._onCommand(event);"
-                     onclick="checkForMiddleClick(this, event);"
-                     onpopupshowing="if (!this.parentNode._placesView)
-                                       new HistoryMenu(event);"
-                     tooltip="bhTooltip"
-                     popupsinherittooltip="true">
-            <menuitem id="appmenu_showAllHistory"
-                      label="&showAllHistoryCmd2.label;"
-                      command="Browser:ShowAllHistory"
-                      key="showAllHistoryKb"/>
-            <menuseparator/>
-            <menuitem id="appmenu_sanitizeHistory"
-                      label="&clearRecentHistory.label;"
-                      key="key_sanitize"
-                      command="Tools:Sanitize"/>
-            <menuseparator class="hide-if-empty-places-result"/>
-#ifdef MOZ_SERVICES_SYNC
-            <menuitem id="appmenu_sync-tabs"
-                      class="syncTabsMenuItem"
-                      label="&syncTabsMenu2.label;"
-                      oncommand="BrowserOpenSyncTabs();"
-                      disabled="true"/>
-#endif
-            <menuitem id="appmenu_restoreLastSession"
-                      label="&historyRestoreLastSession.label;"
-                      command="Browser:RestoreLastSession"/>
-            <menu id="appmenu_recentlyClosedTabsMenu"
-                  class="recentlyClosedTabsMenu"
-                  label="&historyUndoMenu.label;"
-                  disabled="true">
-              <menupopup id="appmenu_recentlyClosedTabsMenupopup"
-                         onpopupshowing="document.getElementById('appmenu_history')._placesView.populateUndoSubmenu();"/>
-            </menu>
-            <menu id="appmenu_recentlyClosedWindowsMenu"
-                  class="recentlyClosedWindowsMenu"
-                  label="&historyUndoWindowMenu.label;"
-                  disabled="true">
-              <menupopup id="appmenu_recentlyClosedWindowsMenupopup"
-                         onpopupshowing="document.getElementById('appmenu_history')._placesView.populateUndoWindowSubmenu();"/>
-            </menu>
-            <menuseparator/>
-          </menupopup>
-      </splitmenu>
-      <menuitem id="appmenu_downloads"
-                class="menuitem-tooltip"
-                label="&downloads.label;"
-                command="Tools:Downloads"
-                key="key_openDownloads"/>
-      <spacer id="appmenuSecondaryPane-spacer"/>
-      <menuitem id="appmenu_addons"
-                class="menuitem-iconic menuitem-iconic-tooltip"
-                label="&addons.label;"
-                command="Tools:Addons"
-                key="key_openAddons"/>
-      <splitmenu id="appmenu_customize"
-#ifdef XP_UNIX
-                 label="&preferencesCmdUnix.label;"
-#else
-                 label="&preferencesCmd2.label;"
-#endif
-                 oncommand="openPreferences();">
-          <menupopup id="appmenu_customizeMenu"
-                     onpopupshowing="onViewToolbarsPopupShowing(event, document.getElementById('appmenu_toggleToolbarsSeparator'));">
-            <menuitem id="appmenu_preferences"
-#ifdef XP_UNIX
-                      label="&preferencesCmdUnix.label;"
-#else
-                      label="&preferencesCmd2.label;"
-#endif
-                      oncommand="openPreferences();"/>
-            <menuseparator/>
-            <menuseparator id="appmenu_toggleToolbarsSeparator"/>
-            <menuitem id="appmenu_toggleTabsOnTop"
-                      label="&viewTabsOnTop.label;"
-                      type="checkbox"
-                      command="cmd_ToggleTabsOnTop"/>
-            <menuitem id="appmenu_toolbarLayout"
-                      label="&appMenuToolbarLayout.label;"
-                      command="cmd_CustomizeToolbars"/>
-          </menupopup>
-      </splitmenu>
-      <splitmenu id="appmenu_help"
-                 label="&helpMenu.label;"
-                 oncommand="openHelpLink('firefox-help')">
-          <menupopup id="appmenu_helpMenupopup">
-            <menuitem id="appmenu_openHelp"
-                      label="&helpMenu.label;"
-                      oncommand="openHelpLink('firefox-help')"
-                      onclick="checkForMiddleClick(this, event);"/>
-            <menuitem id="appmenu_gettingStarted"
-                      label="&appMenuGettingStarted.label;"
-                      oncommand="gBrowser.loadOneTab('https://www.mozilla.org/firefox/central/', {inBackground: false});"
-                      onclick="checkForMiddleClick(this, event);"/>
-            <menuitem id="appmenu_keyboardShortcuts"
-                      label="&helpKeyboardShortcuts.label;"
-                      oncommand="openHelpLink('keyboard-shortcuts')"
-                      onclick="checkForMiddleClick(this, event);"/>
-#ifdef MOZ_SERVICES_HEALTHREPORT
-            <menuitem id="appmenu_healthReport"
-                      label="&healthReport.label;"
-                      oncommand="openHealthReport()"
-                      onclick="checkForMiddleClick(this, event);"/>
-#endif
-            <menuitem id="appmenu_troubleshootingInfo"
-                      label="&helpTroubleshootingInfo.label;"
-                      oncommand="openTroubleshootingPage()"
-                      onclick="checkForMiddleClick(this,event);"/>
-            <menuitem id="appmenu_feedbackPage"
-                      label="&helpFeedbackPage.label;"
-                      oncommand="openFeedbackPage()"
-                      onclick="checkForMiddleClick(this, event);"/>
-            <menuseparator/>
-            <menuitem id="appmenu_safeMode"
-                      label="&appMenuSafeMode.label;"
-                      oncommand="safeModeRestart();"/>
-            <menuseparator/>
-            <menuitem id="appmenu_about"
-                      label="&aboutProduct.label;"
-                      oncommand="openAboutDialog();"/>
-          </menupopup>
-      </splitmenu>
-    </vbox>
-  </hbox>
-</menupopup>

browser/base/content/browser-customization.js

@@ -0,0 +1,97 @@
+# -*- Mode: javascript; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/**
+ * Customization handler prepares this browser window for entering and exiting
+ * customization mode by handling customizationstarting and customizationending
+ * events.
+ */
+let CustomizationHandler = {
+  handleEvent: function(aEvent) {
+    switch(aEvent.type) {
+      case "customizationstarting":
+        this._customizationStarting();
+        break;
+      case "customizationending":
+        this._customizationEnding(aEvent.detail);
+        break;
+    }
+  },
+
+  isCustomizing: function() {
+    return document.documentElement.hasAttribute("customizing") ||
+           document.documentElement.hasAttribute("customize-exiting");
+  },
+
+  _customizationStarting: function() {
+    // Disable the toolbar context menu items
+    let menubar = document.getElementById("main-menubar");
+    for (let childNode of menubar.childNodes)
+      childNode.setAttribute("disabled", true);
+
+    let cmd = document.getElementById("cmd_CustomizeToolbars");
+    cmd.setAttribute("disabled", "true");
+
+    let splitter = document.getElementById("urlbar-search-splitter");
+    if (splitter) {
+      splitter.parentNode.removeChild(splitter);
+    }
+
+    CombinedStopReload.uninit();
+    PlacesToolbarHelper.customizeStart();
+    BookmarkingUI.customizeStart();
+    DownloadsButton.customizeStart();
+  },
+
+  _customizationEnding: function(aDetails) {
+    // Update global UI elements that may have been added or removed
+    if (aDetails.changed) {
+      gURLBar = document.getElementById("urlbar");
+
+      gProxyFavIcon = document.getElementById("page-proxy-favicon");
+      gHomeButton.updateTooltip();
+      gIdentityHandler._cacheElements();
+      XULBrowserWindow.init();
+
+#ifndef XP_MACOSX
+      updateEditUIVisibility();
+#endif
+
+      // Hacky: update the PopupNotifications' object's reference to the iconBox,
+      // if it already exists, since it may have changed if the URL bar was
+      // added/removed.
+      if (!window.__lookupGetter__("PopupNotifications")) {
+        PopupNotifications.iconBox =
+          document.getElementById("notification-popup-box");
+      }
+
+    }
+
+    PlacesToolbarHelper.customizeDone();
+    BookmarkingUI.customizeDone();
+    DownloadsButton.customizeDone();
+
+    // The url bar splitter state is dependent on whether stop/reload
+    // and the location bar are combined, so we need this ordering
+    CombinedStopReload.init();
+    UpdateUrlbarSearchSplitterState();
+
+    // Update the urlbar
+    if (gURLBar) {
+      URLBarSetURI();
+      XULBrowserWindow.asyncUpdateUI();
+      BookmarkingUI.updateStarState();
+    }
+
+    // Re-enable parts of the UI we disabled during the dialog
+    let menubar = document.getElementById("main-menubar");
+    for (let childNode of menubar.childNodes)
+      childNode.setAttribute("disabled", false);
+    let cmd = document.getElementById("cmd_CustomizeToolbars");
+    cmd.removeAttribute("disabled");
+
+    gBrowser.selectedBrowser.focus();
+  }
+}

browser/base/content/browser-feeds.js

@@ -8,66 +8,53 @@
  * and shows UI when they are discovered.
  */
 var FeedHandler = {
-  /**
+  /** Called when the user clicks on the Subscribe to This Page... menu item,
-   * The click handler for the Feed icon in the toolbar. Opens the
+   * or when the user clicks the feed button when the page contains multiple
-   * subscription page if user is not given a choice of feeds.
+   * feeds.
-   * (Otherwise the list of available feeds will be presented to the
-   * user in a popup menu.)
-   */
-  onFeedButtonClick: function(event) {
-    event.stopPropagation();
-
-    let feeds = gBrowser.selectedBrowser.feeds || [];
-    // If there are multiple feeds, the menu will open, so no need to do
-    // anything. If there are no feeds, nothing to do either.
-    if (feeds.length != 1)
-      return;
-
-    if (event.eventPhase == Event.AT_TARGET &&
-        (event.button == 0 || event.button == 1)) {
-      this.subscribeToFeed(feeds[0].href, event);
-    }
-  },
-
- /** Called when the user clicks on the Subscribe to This Page... menu item.
    * Builds a menu of unique feeds associated with the page, and if there
    * is only one, shows the feed inline in the browser window.
-   * @param   menuPopup
+   * @param   container
-   *          The feed list menupopup to be populated.
+   *          The feed list container (menupopup or subview) to be populated.
-   * @returns true if the menu should be shown, false if there was only
+   * @param   isSubview
+   *          Whether we're creating a subview (true) or menu (false/undefined)
+   * @returns true if the menu/subview should be shown, false if there was only
    *          one feed and the feed should be shown inline in the browser
-   *          window (do not show the menupopup).
+   *          window (do not show the menupopup/subview).
    */
-  buildFeedList: function(menuPopup) {
+  buildFeedList: function(container, isSubview) {
     var feeds = gBrowser.selectedBrowser.feeds;
-    if (feeds == null) {
+    if (!isSubview && feeds == null) {
       // XXX hack -- menu opening depends on setting of an "open"
       // attribute, and the menu refuses to open if that attribute is
       // set (because it thinks it's already open).  onpopupshowing gets
       // called after the attribute is unset, and it doesn't get unset
       // if we return false.  so we unset it here; otherwise, the menu
       // refuses to work past this point.
-      menuPopup.parentNode.removeAttribute("open");
+      container.parentNode.removeAttribute("open");
       return false;
     }
 
-    while (menuPopup.firstChild)
+    while (container.firstChild)
-      menuPopup.removeChild(menuPopup.firstChild);
+      container.removeChild(container.firstChild);
 
-    if (feeds.length <= 1)
+    if (!feeds || feeds.length <= 1)
       return false;
 
     // Build the menu showing the available feed choices for viewing.
+    var itemNodeType = isSubview ? "toolbarbutton" : "menuitem";
     for (let feedInfo of feeds) {
-      var menuItem = document.createElement("menuitem");
+      var item = document.createElement(itemNodeType);
       var baseTitle = feedInfo.title || feedInfo.href;
       var labelStr = gNavigatorBundle.getFormattedString("feedShowFeedNew", [baseTitle]);
-      menuItem.setAttribute("class", "feed-menuitem");
+      item.setAttribute("class", "feed-" + itemNodeType);
-      menuItem.setAttribute("label", labelStr);
+      item.setAttribute("label", labelStr);
-      menuItem.setAttribute("feed", feedInfo.href);
+      item.setAttribute("feed", feedInfo.href);
-      menuItem.setAttribute("tooltiptext", feedInfo.href);
+      item.setAttribute("tooltiptext", feedInfo.href);
-      menuItem.setAttribute("crop", "center");
+      item.setAttribute("crop", "center");
-      menuPopup.appendChild(menuItem);
+      if (isSubview) {
+        item.setAttribute("tabindex", "0");
+      }
+      container.appendChild(item);
     }
     return true;
   },
@@ -76,7 +63,7 @@ var FeedHandler = {
    * Subscribe to a given feed.  Called when
    *   1. Page has a single feed and user clicks feed icon in location bar
    *   2. Page has a single feed and user selects Subscribe menu item
-   *   3. Page has multiple feeds and user selects from feed icon popup
+   *   3. Page has multiple feeds and user selects from feed icon popup (or subview)
    *   4. Page has multiple feeds and user selects from Subscribe submenu
    * @param   href
    *          The feed to subscribe to. May be null, in which case the

browser/base/content/browser-fullScreen.js

@@ -17,7 +17,7 @@ var FullScreen = {
       enterFS = !enterFS;
 
     // Toggle the View:FullScreen command, which controls elements like the
-    // fullscreen menuitem, menubars, and the appmenu.
+    // fullscreen menuitem, and menubars.
     let fullscreenCommand = document.getElementById("View:FullScreen");
     if (enterFS) {
       fullscreenCommand.setAttribute("checked", enterFS);
@@ -517,15 +517,6 @@ var FullScreen = {
       // XXX don't interfere with previously collapsed toolbars
       if (el.getAttribute("fullscreentoolbar") == "true") {
         if (!aShow) {
-
-          var toolbarMode = el.getAttribute("mode");
-          if (toolbarMode != "text") {
-            el.setAttribute("saved-mode", toolbarMode);
-            el.setAttribute("saved-iconsize", el.getAttribute("iconsize"));
-            el.setAttribute("mode", "icons");
-            el.setAttribute("iconsize", "small");
-          }
-
           // Give the main nav bar and the tab bar the fullscreen context menu,
           // otherwise remove context menu to prevent breakage
           el.setAttribute("saved-context", el.getAttribute("context"));
@@ -539,18 +530,10 @@ var FullScreen = {
           el.setAttribute("inFullscreen", true);
         }
         else {
-          var restoreAttr = function restoreAttr(attrName) {
+          if (el.hasAttribute("saved-context")) {
-            var savedAttr = "saved-" + attrName;
+            el.setAttribute("context", el.getAttribute("saved-context"));
-            if (el.hasAttribute(savedAttr)) {
+            el.removeAttribute("saved-context");
-              el.setAttribute(attrName, el.getAttribute(savedAttr));
-              el.removeAttribute(savedAttr);
-            }
           }
-
-          restoreAttr("mode");
-          restoreAttr("iconsize");
-          restoreAttr("context");
-
           el.removeAttribute("inFullscreen");
         }
       } else {
@@ -571,11 +554,9 @@ var FullScreen = {
       document.documentElement.setAttribute("inFullscreen", true);
     }
 
-    // In tabs-on-top mode, move window controls to the tab bar,
-    // and in tabs-on-bottom mode, move them back to the navigation toolbar.
     var fullscreenctls = document.getElementById("window-controls");
     var navbar = document.getElementById("nav-bar");
-    var ctlsOnTabbar = window.toolbar.visible && (navbar.collapsed || TabsOnTop.enabled);
+    var ctlsOnTabbar = window.toolbar.visible;
     if (fullscreenctls.parentNode == navbar && ctlsOnTabbar) {
       fullscreenctls.removeAttribute("flex");
       document.getElementById("TabsToolbar").appendChild(fullscreenctls);

browser/base/content/browser-fullZoom.js

@@ -397,6 +397,7 @@ var FullZoom = {
    * @param browser  The zoom of this browser will be saved.  Required.
    */
   _applyZoomToPref: function FullZoom__applyZoomToPref(browser) {
+    Services.obs.notifyObservers(null, "browser-fullZoom:zoomChange", "");
     if (!this.siteSpecific ||
         gInPrintPreviewMode ||
         browser.contentDocument.mozSyntheticDocument)
@@ -417,6 +418,7 @@ var FullZoom = {
    * @param browser  The zoom of this browser will be removed.  Required.
    */
   _removePref: function FullZoom__removePref(browser) {
+    Services.obs.notifyObservers(null, "browser-fullZoom:zoomReset", "");
     if (browser.contentDocument.mozSyntheticDocument)
       return;
     let ctxt = this._loadContextFromWindow(browser.contentWindow);

browser/base/content/browser-menubar.inc

@@ -185,11 +185,6 @@
                       accesskey="&viewToolbarsMenu.accesskey;">
                   <menupopup onpopupshowing="onViewToolbarsPopupShowing(event);">
                     <menuseparator/>
-                    <menuitem id="menu_tabsOnTop"
-                              command="cmd_ToggleTabsOnTop"
-                              type="checkbox"
-                              label="&viewTabsOnTop.label;"
-                              accesskey="&viewTabsOnTop.accesskey;"/>
                     <menuitem id="menu_customizeToolbars"
                               label="&viewCustomizeToolbar.label;"
                               accesskey="&viewCustomizeToolbar.accesskey;"

browser/base/content/browser-places.js

@@ -134,9 +134,6 @@ var StarUI = {
     document.loadOverlay(
       "chrome://browser/content/places/editBookmarkOverlay.xul",
       (function (aSubject, aTopic, aData) {
-        //XXX We just caused localstore.rdf to be re-applied (bug 640158)
-        retrieveToolbarIconsizesFromTheme();
-
         // Move the header (star, title, button) into the grid,
         // so that it aligns nicely with the other items (bug 484022).
         let header = this._element("editBookmarkPanelHeader");
@@ -745,9 +742,10 @@ var BookmarksEventHandler = {
 // Handles special drag and drop functionality for Places menus that are not
 // part of a Places view (e.g. the bookmarks menu in the menubar).
 var PlacesMenuDNDHandler = {
-  _springLoadDelay: 350, // milliseconds
+  _springLoadDelayMs: 350,
+  _closeDelayMs: 500,
   _loadTimer: null,
-  _closerTimer: null,
+  _closeTimer: null,
 
   /**
    * Called when the user enters the <menu> element during a drag.
@@ -768,7 +766,7 @@ var PlacesMenuDNDHandler = {
       this._loadTimer = null;
       popup.setAttribute("autoopened", "true");
       popup.showPopup(popup);
-    }, this._springLoadDelay, Ci.nsITimer.TYPE_ONE_SHOT);
+    }, this._springLoadDelayMs, Ci.nsITimer.TYPE_ONE_SHOT);
     event.preventDefault();
     event.stopPropagation();
   },
@@ -781,7 +779,8 @@ var PlacesMenuDNDHandler = {
   onDragLeave: function PMDH_onDragLeave(event) {
     // Handle menu-button separate targets.
     if (event.relatedTarget === event.currentTarget ||
-        event.relatedTarget.parentNode === event.currentTarget)
+        (event.relatedTarget &&
+         event.relatedTarget.parentNode === event.currentTarget))
       return;
 
     // Closing menus in a Places popup is handled by the view itself.
@@ -807,7 +806,7 @@ var PlacesMenuDNDHandler = {
         popup.removeAttribute("autoopened");
         popup.hidePopup();
       }
-    }, this._springLoadDelay, Ci.nsITimer.TYPE_ONE_SHOT);
+    }, this._closeDelayMs, Ci.nsITimer.TYPE_ONE_SHOT);
   },
 
   /**
@@ -875,30 +874,52 @@ let PlacesToolbarHelper = {
     if (!viewElt || viewElt._placesView)
       return;
 
-    // If the bookmarks toolbar item is hidden because the parent toolbar is
+    // If the bookmarks toolbar item is:
-    // collapsed or hidden (i.e. in a popup), spare the initialization.  Also,
+    // - not in a toolbar, or;
-    // there is no need to initialize the toolbar if customizing because
+    // - the toolbar is collapsed, or;
-    // init() will be called when the customization is done.
+    // - the toolbar is hidden some other way:
-    let toolbar = viewElt.parentNode.parentNode;
+    // don't initialize.  Also, there is no need to initialize the toolbar if
-    if (toolbar.collapsed ||
+    // customizing, because that will happen when the customization is done.
-        getComputedStyle(toolbar, "").display == "none" ||
+    let toolbar = this._getParentToolbar(viewElt);
-        this._isCustomizing)
+    if (!toolbar || toolbar.collapsed || this._isCustomizing ||
+        getComputedStyle(toolbar, "").display == "none")
       return;
 
     new PlacesToolbar(this._place);
   },
 
   customizeStart: function PTH_customizeStart() {
-    let viewElt = this._viewElt;
+    try {
-    if (viewElt && viewElt._placesView)
+      let viewElt = this._viewElt;
-      viewElt._placesView.uninit();
+      if (viewElt && viewElt._placesView)
-
+        viewElt._placesView.uninit();
-    this._isCustomizing = true;
+    } finally {
+      this._isCustomizing = true;
+    }
   },
 
   customizeDone: function PTH_customizeDone() {
     this._isCustomizing = false;
     this.init();
+  },
+
+  onPlaceholderCommand: function () {
+    let widgetGroup = CustomizableUI.getWidget("personal-bookmarks");
+    let widget = widgetGroup.forWindow(window);
+    if (widget.overflowed ||
+        widgetGroup.areaType == CustomizableUI.TYPE_MENU_PANEL) {
+      PlacesCommandHook.showPlacesOrganizer("BookmarksToolbar");
+    }
+  },
+
+  _getParentToolbar: function(element) {
+    while (element) {
+      if (element.localName == "toolbar") {
+        return element;
+      }
+      element = element.parentNode;
+    }
+    return null;
   }
 };
 
@@ -906,31 +927,33 @@ let PlacesToolbarHelper = {
 //// BookmarkingUI
 
 /**
- * Handles the bookmarks star button in the URL bar, as well as the bookmark
+ * Handles the bookmarks menu-button in the toolbar.
- * menu button.
  */
 
 let BookmarkingUI = {
   get button() {
-    if (!this._button) {
+    let widgetGroup = CustomizableUI.getWidget("bookmarks-menu-button");
-      this._button = document.getElementById("bookmarks-menu-button");
+    if (widgetGroup.areaType == CustomizableUI.TYPE_TOOLBAR) {
+      return widgetGroup.forWindow(window).node;
     }
-    return this._button;
+    return null;
   },
 
   get star() {
-    if (!this._star) {
+    let button = this.button;
-      this._star = document.getElementById("star-button");
+    return button && document.getAnonymousElementByAttribute(button, "anonid",
-    }
+                                                             "button");
-    return this._star;
   },
 
   get anchor() {
-    if (this.star && isElementVisible(this.star)) {
+    let widget = CustomizableUI.getWidget("bookmarks-menu-button")
-      // Anchor to the icon, so the panel looks more natural.
+                               .forWindow(window);
-      return this.star;
+    if (widget.overflowed)
-    }
+      return widget.anchor;
-    return null;
+
+    let star = this.star;
+    return star && document.getAnonymousElementByAttribute(star, "class",
+                                                           "toolbarbutton-icon");
   },
 
   STATUS_UPDATING: -1,
@@ -939,9 +962,9 @@ let BookmarkingUI = {
   get status() {
     if (this._pendingStmt)
       return this.STATUS_UPDATING;
-    return this.star &&
+    let button = this.button;
-           this.star.hasAttribute("starred") ? this.STATUS_STARRED
+    return button && button.hasAttribute("starred") ? this.STATUS_STARRED
-                                             : this.STATUS_UNSTARRED;
+                                                    : this.STATUS_UNSTARRED;
   },
 
   get _starredTooltip()
@@ -974,6 +997,16 @@ let BookmarkingUI = {
     if (event.target != event.currentTarget)
       return;
 
+    let widget = CustomizableUI.getWidget("bookmarks-menu-button")
+                               .forWindow(window);
+    if (widget.overflowed) {
+      // Don't open a popup in the overflow popup, rather just open the Library.
+      event.preventDefault();
+      widget.node.removeAttribute("noautoclose");
+      PlacesCommandHook.showPlacesOrganizer("BookmarksMenu");
+      return;
+    }
+
     if (!this._popupNeedsUpdate)
       return;
     this._popupNeedsUpdate = false;
@@ -990,14 +1023,6 @@ let BookmarkingUI = {
       let personalToolbar = document.getElementById("PersonalToolbar");
       viewToolbarMenuitem.setAttribute("checked", !personalToolbar.collapsed);
     }
-
-    let toolbarMenuitem = getPlacesAnonymousElement("toolbar-autohide");
-    if (toolbarMenuitem) {
-      // If bookmarks items are visible, hide Bookmarks Toolbar menu and the
-      // separator after it.
-      toolbarMenuitem.collapsed = toolbarMenuitem.nextSibling.collapsed =
-        isElementVisible(document.getElementById("personal-bookmarks"));
-    }
   },
 
   /**
@@ -1010,29 +1035,31 @@ let BookmarkingUI = {
 
     if (aState == "invalid") {
       this.star.setAttribute("disabled", "true");
-      this.star.removeAttribute("starred");
+      this.button.removeAttribute("starred");
+      this.button.setAttribute("buttontooltiptext", "");
     }
     else {
       this.star.removeAttribute("disabled");
     }
+    this._updateToolbarStyle();
   },
 
   _updateToolbarStyle: function BUI__updateToolbarStyle() {
-    if (!this.button) {
+    let button = this.button;
+    if (!button)
       return;
-    }
 
     let personalToolbar = document.getElementById("PersonalToolbar");
-    let onPersonalToolbar = this.button.parentNode == personalToolbar ||
+    let onPersonalToolbar = button.parentNode == personalToolbar ||
-                            this.button.parentNode.parentNode == personalToolbar;
+                            button.parentNode.parentNode == personalToolbar;
 
     if (onPersonalToolbar) {
-      this.button.classList.add("bookmark-item");
+      button.classList.add("bookmark-item");
-      this.button.classList.remove("toolbarbutton-1");
+      button.classList.remove("toolbarbutton-1");
     }
     else {
-      this.button.classList.remove("bookmark-item");
+      button.classList.remove("bookmark-item");
-      this.button.classList.add("toolbarbutton-1");
+      button.classList.add("toolbarbutton-1");
     }
   },
 
@@ -1040,9 +1067,9 @@ let BookmarkingUI = {
     // When an element with a placesView attached is removed and re-inserted,
     // XBL reapplies the binding causing any kind of issues and possible leaks,
     // so kill current view and let popupshowing generate a new one.
-    if (this.button && this.button._placesView) {
+    let button = this.button;
-      this.button._placesView.uninit();
+    if (button && button._placesView)
-    }
+      button._placesView.uninit();
   },
 
   customizeStart: function BUI_customizeStart() {
@@ -1054,7 +1081,6 @@ let BookmarkingUI = {
   },
 
   customizeDone: function BUI_customizeDone() {
-    delete this._button;
     this.onToolbarVisibilityChange();
     this._updateToolbarStyle();
   },
@@ -1074,7 +1100,7 @@ let BookmarkingUI = {
   },
 
   updateStarState: function BUI_updateStarState() {
-    if (!this.star || (this._uri && gBrowser.currentURI.equals(this._uri))) {
+    if (!this.button || (this._uri && gBrowser.currentURI.equals(this._uri))) {
       return;
     }
 
@@ -1123,17 +1149,17 @@ let BookmarkingUI = {
   },
 
   _updateStar: function BUI__updateStar() {
-    if (!this.star) {
+    let button = this.button;
+    if (!button)
       return;
-    }
 
     if (this._itemIds.length > 0) {
-      this.star.setAttribute("starred", "true");
+      button.setAttribute("starred", "true");
-      this.star.setAttribute("tooltiptext", this._starredTooltip);
+      button.setAttribute("buttontooltiptext", this._starredTooltip);
     }
     else {
-      this.star.removeAttribute("starred");
+      button.removeAttribute("starred");
-      this.star.setAttribute("tooltiptext", this._unstarredTooltip);
+      button.setAttribute("buttontooltiptext", this._unstarredTooltip);
     }
   },
 
@@ -1141,15 +1167,71 @@ let BookmarkingUI = {
     if (aEvent.target != aEvent.currentTarget) {
       return;
     }
+
+    // Handle special case when the button is in the panel.
+    let widgetGroup = CustomizableUI.getWidget("bookmarks-menu-button");
+    let widget = widgetGroup.forWindow(window);
+    if (widgetGroup.areaType == CustomizableUI.TYPE_MENU_PANEL) {
+      let view = document.getElementById("PanelUI-bookmarks");
+      view.addEventListener("ViewShowing", this.onPanelMenuViewShowing);
+      view.addEventListener("ViewHiding", this.onPanelMenuViewHiding);
+      widget.node.setAttribute("noautoclose", "true");
+      PanelUI.showSubView("PanelUI-bookmarks", widget.node,
+                          CustomizableUI.AREA_PANEL);
+      return;
+    }
+    else if (widget.overflowed) {
+      // Allow to close the panel if the page is already bookmarked, cause
+      // we are going to open the edit bookmark panel.
+      if (this._itemIds.length > 0)
+        widget.node.removeAttribute("noautoclose");
+      else
+        widget.node.setAttribute("noautoclose", "true");
+    }
+
     // Ignore clicks on the star if we are updating its state.
     if (!this._pendingStmt) {
       PlacesCommandHook.bookmarkCurrentPage(this._itemIds.length > 0);
     }
   },
 
+  onPanelMenuViewShowing: function BUI_onViewShowing(aEvent) {
+    // Update checked status of the toolbar toggle.
+    let viewToolbar = document.getElementById("panelMenu_viewBookmarksToolbar");
+    let personalToolbar = document.getElementById("PersonalToolbar");
+    if (personalToolbar.collapsed)
+      viewToolbar.removeAttribute("checked");
+    else
+      viewToolbar.setAttribute("checked", "true");
+    // Setup the Places view.
+    this._panelMenuView = new PlacesPanelMenuView("place:folder=BOOKMARKS_MENU",
+                                                  "panelMenu_bookmarksMenu",
+                                                  "panelMenu_bookmarksMenu");
+  },
+
+  onPanelMenuViewHiding: function BUI_onViewHiding(aEvent) {
+    this._panelMenuView.uninit();
+    delete this._panelMenuView;
+  },
+
+  onPanelMenuViewCommand: function BUI_onPanelMenuViewCommand(aEvent, aView) {
+    let target = aEvent.originalTarget;
+    if (!target._placesNode)
+      return;
+    if (PlacesUtils.nodeIsContainer(target._placesNode))
+      PlacesCommandHook.showPlacesOrganizer([ "BookmarksMenu", target._placesNode.itemId ]);
+    else
+      PlacesUIUtils.openNodeWithEvent(target._placesNode, aEvent, aView);
+    PanelUI.hide();
+  },
+
   // nsINavBookmarkObserver
   onItemAdded: function BUI_onItemAdded(aItemId, aParentId, aIndex, aItemType,
                                         aURI) {
+    if (!this.button) {
+      return;
+    }
+
     if (aURI && aURI.equals(this._uri)) {
       // If a new bookmark has been added to the tracked uri, register it.
       if (this._itemIds.indexOf(aItemId) == -1) {
@@ -1160,6 +1242,10 @@ let BookmarkingUI = {
   },
 
   onItemRemoved: function BUI_onItemRemoved(aItemId) {
+    if (!this.button) {
+      return;
+    }
+
     let index = this._itemIds.indexOf(aItemId);
     // If one of the tracked bookmarks has been removed, unregister it.
     if (index != -1) {
@@ -1170,6 +1256,10 @@ let BookmarkingUI = {
 
   onItemChanged: function BUI_onItemChanged(aItemId, aProperty,
                                             aIsAnnotationProperty, aNewValue) {
+    if (!this.button) {
+      return;
+    }
+
     if (aProperty == "uri") {
       let index = this._itemIds.indexOf(aItemId);
       // If the changed bookmark was tracked, check if it is now pointing to

browser/base/content/browser-sets.inc

@@ -32,7 +32,6 @@
     <command id="cmd_printPreview" oncommand="PrintUtils.printPreview(PrintPreviewListener);"/>
     <command id="cmd_close" oncommand="BrowserCloseTabOrWindow()"/>
     <command id="cmd_closeWindow" oncommand="BrowserTryToCloseWindow()"/>
-    <command id="cmd_ToggleTabsOnTop" oncommand="TabsOnTop.toggle()"/>
     <command id="cmd_CustomizeToolbars" oncommand="BrowserCustomizeToolbar()"/>
     <command id="cmd_quitApplication" oncommand="goQuitApplication()"/>
 
@@ -109,13 +108,13 @@
       oncommand="OpenBrowserWindow({private: true});"/>
     <command id="History:UndoCloseTab" oncommand="undoCloseTab();"/>
     <command id="History:UndoCloseWindow" oncommand="undoCloseWindow();"/>
-    <command id="Browser:ToggleAddonBar" oncommand="toggleAddonBar();"/>
     <command id="Social:SharePage" oncommand="SocialShare.sharePage();" disabled="true"/>
     <command id="Social:ToggleSidebar" oncommand="Social.toggleSidebar();" hidden="true"/>
     <command id="Social:ToggleNotifications" oncommand="Social.toggleNotifications();" hidden="true"/>
     <command id="Social:FocusChat" oncommand="SocialChatBar.focus();" hidden="true" disabled="true"/>
     <command id="Social:Toggle" oncommand="Social.toggle();" hidden="true"/>
     <command id="Social:Addons" oncommand="BrowserOpenAddonsMgr('addons://list/service');"/>
+    <command id="MenuPanel:Toggle" oncommand="PanelUI.toggle(event);"/>
   </commandset>
 
   <commandset id="placesCommands">
@@ -412,6 +411,13 @@
 #endif
     <key id="key_undoCloseWindow" command="History:UndoCloseWindow" key="&newNavigatorCmd.key;" modifiers="accel,shift"/>
 
+    <key id="key_menuButton" command="MenuPanel:Toggle"
+#ifdef XP_MACOSX
+         key="&toggleMenuPanelMac.key;" modifiers="accel,shift"/>
+#else
+         key="&toggleMenuPanel.key;" modifiers="accel"/>
+#endif
+
 #ifdef XP_GNOME
 #define NUM_SELECT_TAB_MODIFIER alt
 #else
@@ -428,8 +434,6 @@
 #expand    <key id="key_selectTab8" oncommand="gBrowser.selectTabAtIndex(7, event);" key="8" modifiers="__NUM_SELECT_TAB_MODIFIER__"/>
 #expand    <key id="key_selectLastTab" oncommand="gBrowser.selectTabAtIndex(-1, event);" key="9" modifiers="__NUM_SELECT_TAB_MODIFIER__"/>
 
-    <key id="key_toggleAddonBar" command="Browser:ToggleAddonBar" key="&toggleAddonBarCmd.key;" modifiers="accel"/>
-
   </keyset>
 
 # Used by baseMenuOverlay

browser/base/content/browser-social.js

@@ -789,9 +789,7 @@ SocialShare = {
     iframe.setAttribute("src", shareEndpoint);
 
     let navBar = document.getElementById("nav-bar");
-    let anchor = navBar.getAttribute("mode") == "text" ?
+    let anchor = document.getAnonymousElementByAttribute(this.shareButton, "class", "toolbarbutton-icon");
-                   document.getAnonymousElementByAttribute(this.shareButton, "class", "toolbarbutton-text") :
-                   document.getAnonymousElementByAttribute(this.shareButton, "class", "toolbarbutton-icon");
     this.panel.openPopup(anchor, "bottomcenter topright", 0, 0, false, false);
     Social.setErrorListener(iframe, this.setErrorMessage.bind(this));
   }
@@ -1124,9 +1122,7 @@ SocialToolbar = {
     });
 
     let navBar = document.getElementById("nav-bar");
-    let anchor = navBar.getAttribute("mode") == "text" ?
+    let anchor = document.getAnonymousElementByAttribute(aToolbarButton, "class", "toolbarbutton-badge-container");
-                   document.getAnonymousElementByAttribute(aToolbarButton, "class", "toolbarbutton-text") :
-                   document.getAnonymousElementByAttribute(aToolbarButton, "class", "toolbarbutton-badge-container");
     // Bug 849216 - open the popup in a setTimeout so we avoid the auto-rollup
     // handling from preventing it being opened in some cases.
     setTimeout(function() {

browser/base/content/browser-tabview.js

@@ -418,16 +418,13 @@ let TabView = {
 
     let toolbar = document.getElementById("TabsToolbar");
     let currentSet = toolbar.currentSet.split(",");
-
     let alltabsPos = currentSet.indexOf("alltabs-button");
     if (-1 == alltabsPos)
       return;
 
-    currentSet[alltabsPos] += "," + buttonId;
+    let allTabsBtn = document.getElementById("alltabs-button");
-    currentSet = currentSet.join(",");
+    let nextItem = allTabsBtn.nextSibling;
-    toolbar.currentSet = currentSet;
+    toolbar.insertItem(buttonId, nextItem);
-    toolbar.setAttribute("currentset", currentSet);
-    document.persist(toolbar.id, "currentset");
   },
 
   // ----------

browser/base/content/browser.css

@@ -21,6 +21,63 @@ searchbar {
   -moz-binding: url("chrome://global/content/bindings/remote-browser.xml#remote-browser");
 }
 
+toolbar[customizable="true"] {
+  -moz-binding: url("chrome://browser/content/customizableui/toolbar.xml#toolbar");
+}
+
+%ifdef XP_MACOSX
+#toolbar-menubar {
+  -moz-binding: url("chrome://browser/content/customizableui/toolbar.xml#toolbar-menubar-stub");
+}
+
+toolbar[customizable="true"]:not([nowindowdrag="true"]) {
+  -moz-binding: url("chrome://browser/content/customizableui/toolbar.xml#toolbar-drag");
+}
+%endif
+
+#toolbar-menubar[autohide="true"] {
+  -moz-binding: url("chrome://browser/content/customizableui/toolbar.xml#toolbar-menubar-autohide");
+}
+
+#addon-bar {
+  -moz-binding: url("chrome://browser/content/customizableui/toolbar.xml#addonbar-delegating");
+  visibility: visible;
+  margin: 0;
+  height: 0 !important;
+  overflow: hidden;
+  padding: 0;
+  border: 0 none;
+}
+
+#addonbar-closebutton {
+  visibility: visible;
+  height: 0 !important;
+}
+
+#status-bar {
+  height: 0 !important;
+  -moz-binding: none;
+  padding: 0;
+  margin: 0;
+}
+
+panelmultiview {
+  -moz-binding: url("chrome://browser/content/customizableui/panelUI.xml#panelmultiview");
+}
+
+panelview {
+  -moz-binding: url("chrome://browser/content/customizableui/panelUI.xml#panelview");
+  -moz-box-orient: vertical;
+}
+
+.panel-mainview {
+  transition: transform 150ms;
+}
+
+panelview:not([mainview]):not([current]) {
+  display: none;
+}
+
 tabbrowser {
   -moz-binding: url("chrome://browser/content/tabbrowser.xml#tabbrowser");
 }
@@ -47,21 +104,19 @@ tabbrowser {
 
 .tabbrowser-tab:not([pinned]) {
   -moz-box-flex: 100;
-  max-width: 250px;
+  max-width: 180px;
   min-width: 100px;
   width: 0;
   transition: min-width 200ms ease-out,
-              max-width 250ms ease-out,
+              max-width 230ms ease-out;
-              opacity 50ms ease-out 20ms /* hide the tab for the first 20ms of the max-width transition */;
 }
 
 .tabbrowser-tab:not([pinned]):not([fadein]) {
   max-width: 0.1px;
   min-width: 0.1px;
-  opacity: 0 !important;
+  visibility: hidden;
   transition: min-width 200ms ease-out,
-              max-width 250ms ease-out,
+              max-width 230ms ease-out;
-              opacity 50ms ease-out 180ms /* hide the tab for the last 20ms of the max-width transition */;
 }
 
 .tab-throbber:not([fadein]):not([pinned]),
@@ -94,20 +149,13 @@ toolbar[printpreview="true"] {
   -moz-binding: url("chrome://global/content/printPreviewBindings.xml#printpreviewtoolbar");
 }
 
-#toolbar-menubar {
+toolbar[overflowable] > .customization-target {
-  -moz-box-ordinal-group: 5;
+  overflow: hidden;
 }
 
-#navigator-toolbox > toolbar:not(#toolbar-menubar):not(#TabsToolbar) {
+toolbar:not([overflowing]) > .overflow-button,
-  -moz-box-ordinal-group: 50;
+toolbar[customizing] > .overflow-button {
-}
+  display: none;
-
-#TabsToolbar {
-  -moz-box-ordinal-group: 100;
-}
-
-#TabsToolbar[tabsontop="true"] {
-  -moz-box-ordinal-group: 10;
 }
 
 %ifdef CAN_DRAW_IN_TITLEBAR
@@ -125,45 +173,71 @@ toolbar[printpreview="true"] {
   pointer-events: none;
 }
 
-#main-window[tabsintitlebar] #appmenu-button-container,
 #main-window[tabsintitlebar] #titlebar-buttonbox {
   position: relative;
 }
+
+#titlebar-buttonbox {
+  -moz-appearance: -moz-window-button-box;
+}
+
+%ifdef XP_MACOSX
+#titlebar-fullscreen-button {
+  -moz-appearance: -moz-mac-fullscreen-button;
+}
 %endif
 
-.bookmarks-toolbar-customize,
+%ifdef XP_WIN
-#wrapper-personal-bookmarks > #personal-bookmarks > #PlacesToolbar > hbox > #PlacesToolbarItems {
+#main-window[sizemode="maximized"] #titlebar-buttonbox {
+  -moz-appearance: -moz-window-button-box-maximized;
+}
+%endif
+
+%endif
+
+#bookmarks-toolbar-placeholder,
+toolbarpaletteitem > #personal-bookmarks > #PlacesToolbar,
+#personal-bookmarks[cui-areatype="menu-panel"] > #PlacesToolbar,
+#personal-bookmarks[cui-areatype="toolbar"].overflowedItem > #PlacesToolbar {
   display: none;
 }
 
-#wrapper-personal-bookmarks[place="toolbar"] > #personal-bookmarks > #PlacesToolbar > .bookmarks-toolbar-customize {
+toolbarpaletteitem > #personal-bookmarks > #bookmarks-toolbar-placeholder,
+#personal-bookmarks[cui-areatype="menu-panel"] > #bookmarks-toolbar-placeholder,
+#personal-bookmarks[cui-areatype="toolbar"].overflowedItem > #bookmarks-toolbar-placeholder {
   display: -moz-box;
 }
 
-#main-window[disablechrome] #navigator-toolbox[tabsontop="true"] > toolbar:not(#toolbar-menubar):not(#TabsToolbar) {
+#zoom-controls[cui-areatype="toolbar"]:not(.overflowedItem) > #zoom-reset-button > .toolbarbutton-text {
+  display: -moz-box;
+}
+
+#wrapper-urlbar-container > #urlbar-container > #urlbar-wrapper > #urlbar > toolbarbutton,
+#urlbar-reload-button:not([displaystop]) + #urlbar-stop-button,
+#urlbar-reload-button[displaystop] {
   visibility: collapse;
 }
 
-#wrapper-urlbar-container #urlbar-container > #urlbar > toolbarbutton,
+#PanelUI-feeds > .feed-toolbarbutton:-moz-locale-dir(rtl) {
-#urlbar-container:not([combined]) > #urlbar > toolbarbutton,
-#urlbar-container[combined] + #reload-button + #stop-button,
-#urlbar-container[combined] + #reload-button,
-toolbar:not([mode="icons"]) > #urlbar-container > #urlbar > toolbarbutton,
-toolbar[mode="icons"] > #urlbar-container > #urlbar > #urlbar-reload-button:not([displaystop]) + #urlbar-stop-button,
-toolbar[mode="icons"] > #urlbar-container > #urlbar > #urlbar-reload-button[displaystop],
-toolbar[mode="icons"] > #reload-button:not([displaystop]) + #stop-button,
-toolbar[mode="icons"] > #reload-button[displaystop] {
-  visibility: collapse;
-}
-
-#feed-button > .toolbarbutton-menu-dropmarker {
-  display: none;
-}
-
-#feed-menu > .feed-menuitem:-moz-locale-dir(rtl) {
   direction: rtl;
 }
 
+#panelMenu_bookmarksMenu {
+  overflow-x: hidden;
+  overflow-y: auto;
+}
+#panelMenu_bookmarksMenu > .bookmark-item {
+  max-width: none;
+}
+
+#urlbar-container {
+  min-width: 50ch;
+}
+
+#search-container {
+  min-width: 25ch;
+}
+
 #main-window:-moz-lwtheme {
   background-repeat: no-repeat;
   background-position: top right;
@@ -180,27 +254,6 @@ toolbar[mode="icons"] > #reload-button[displaystop] {
   background-position: bottom left;
 }
 
-splitmenu {
-  -moz-binding: url("chrome://browser/content/urlbarBindings.xml#splitmenu");
-}
-
-.splitmenu-menuitem {
-  -moz-binding: url("chrome://global/content/bindings/menu.xml#menuitem");
-  list-style-image: inherit;
-  -moz-image-region: inherit;
-}
-
-.splitmenu-menuitem[iconic="true"] {
-  -moz-binding: url("chrome://global/content/bindings/menu.xml#menuitem-iconic");
-}
-
-.splitmenu-menu > .menu-text,
-:-moz-any(.splitmenu-menu, .splitmenu-menuitem) > .menu-accel-container,
-#appmenu-editmenu > .menu-text,
-#appmenu-editmenu > .menu-accel-container {
-  display: none;
-}
-
 .menuitem-tooltip {
   -moz-binding: url("chrome://browser/content/urlbarBindings.xml#menuitem-tooltip");
 }
@@ -211,18 +264,6 @@ splitmenu {
   -moz-binding: url("chrome://browser/content/urlbarBindings.xml#menuitem-iconic-tooltip");
 }
 
-%ifdef MENUBAR_CAN_AUTOHIDE
-%ifndef CAN_DRAW_IN_TITLEBAR
-#appmenu-toolbar-button > .toolbarbutton-text {
-  display: -moz-box;
-}
-%endif
-
-#appmenu_offlineModeRecovery:not([checked=true]) {
-  display: none;
-}
-%endif
-
 /* Hide menu elements intended for keyboard access support */
 #main-menubar[openedwithkey=false] .show-only-for-keyboard {
   display: none;
@@ -257,7 +298,7 @@ panel[noactions] > richlistbox > richlistitem[type~="action"] > .ac-url-box > .a
   display: none;
 }
 
-#wrapper-urlbar-container > #urlbar-container > #urlbar {
+#wrapper-urlbar-container > #urlbar-container > #urlbar-wrapper > #urlbar {
   -moz-user-input: disabled;
   cursor: grab;
 }
@@ -270,9 +311,7 @@ panel[noactions] > richlistbox > richlistitem[type~="action"] > .ac-url-box > .a
   -moz-binding: url("chrome://browser/content/urlbarBindings.xml#urlbar-rich-result-popup");
 }
 
-#urlbar-container[combined] > #urlbar > #urlbar-icons > #go-button,
+#urlbar[pageproxystate="invalid"] > #urlbar-icons > .urlbar-icon,
-#urlbar[pageproxystate="invalid"] > #urlbar-icons > .urlbar-icon:not(#go-button),
-#urlbar[pageproxystate="valid"] > #urlbar-icons > #go-button,
 #urlbar[pageproxystate="invalid"][focused="true"] > #urlbar-go-button ~ toolbarbutton,
 #urlbar[pageproxystate="valid"] > #urlbar-go-button,
 #urlbar:not([focused="true"]) > #urlbar-go-button {
@@ -316,18 +355,20 @@ toolbarbutton.bookmark-item {
   max-width: 13em;
 }
 
-%ifdef MENUBAR_CAN_AUTOHIDE
-#toolbar-menubar:not([autohide="true"]) ~ toolbar > #bookmarks-menu-button,
-#toolbar-menubar:not([autohide="true"]) > #bookmarks-menu-button {
-  display: none;
-}
-%endif
-
 #editBMPanel_tagsSelector {
   /* override default listbox width from xul.css */
   width: auto;
 }
 
+/* The star doesn't make sense as text */
+toolbar[mode="text"] #bookmarks-menu-button > .toolbarbutton-menubutton-button > .toolbarbutton-icon {
+  display: -moz-box !important;
+}
+toolbar[mode="text"] #bookmarks-menu-button > .toolbarbutton-menubutton-button > .toolbarbutton-text,
+toolbar[mode="full"] #bookmarks-menu-button.bookmark-item > .toolbarbutton-menubutton-button > .toolbarbutton-text {
+  display: none;
+}
+
 menupopup[emptyplacesresult="true"] > .hide-if-empty-places-result {
   display: none;
 }
@@ -352,7 +393,6 @@ window[chromehidden~="toolbar"] toolbar:not(.toolbar-primary):not(.chromeclass-m
 }
 
 #navigator-toolbox ,
-#status-bar ,
 #mainPopupSet {
   min-width: 1px;
 }
@@ -451,14 +491,6 @@ window[chromehidden~="toolbar"] toolbar:not(.toolbar-primary):not(.chromeclass-m
   min-width: 1px;
 }
 
-#nav-bar[mode="text"] > #window-controls > toolbarbutton > .toolbarbutton-icon {
-  display: -moz-box;
-}
-
-#nav-bar[mode="text"] > #window-controls > toolbarbutton > .toolbarbutton-text {
-  display: none;
-}
-
 /* ::::: Ctrl-Tab Panel ::::: */
 
 .ctrlTab-preview > html|img,
@@ -523,17 +555,6 @@ window[chromehidden~="toolbar"] toolbar:not(.toolbar-primary):not(.chromeclass-m
   -moz-binding: url("chrome://browser/content/urlbarBindings.xml#plugin-popupnotification-center-item");
 }
 
-/* override hidden="true" for the status bar compatibility shim
-   in case it was persisted for the real status bar */
-#status-bar {
-  display: -moz-box;
-}
-
-/* Remove the resizer from the statusbar compatibility shim */
-#status-bar[hideresizer] > .statusbar-resizerpanel {
-  display: none;
-}
-
 browser[tabmodalPromptShowing] {
   -moz-user-focus: none !important;
 }
@@ -775,3 +796,14 @@ chatbox:-moz-full-screen-ancestor > .chat-titlebar {
 .contentSelectDropdown-ingroup {
   -moz-margin-start: 2em;
 }
+
+/* Give this menupopup an arrow panel styling */
+#BMB_bookmarksPopup {
+  -moz-appearance: none;
+  -moz-binding: url("chrome://browser/content/places/menu.xml#places-popup-arrow");
+  background: transparent;
+  border: none;
+  transition: opacity 300ms;
+  /* The popup inherits -moz-image-region from the button, must reset it */
+  -moz-image-region: auto;
+}

browser/base/content/global-scripts.inc

@@ -9,5 +9,6 @@
 <script type="application/javascript" src="chrome://browser/content/browser.js"/>
 <script type="application/javascript" src="chrome://browser/content/downloads/downloads.js"/>
 <script type="application/javascript" src="chrome://browser/content/downloads/indicator.js"/>
+<script type="application/javascript" src="chrome://browser/content/customizableui/panelUI.js"/>
 <script type="application/javascript" src="chrome://global/content/inlineSpellCheckUI.js"/>
 <script type="application/javascript" src="chrome://global/content/viewSourceUtils.js"/>

browser/base/content/newtab/newTab.xul

@@ -31,6 +31,7 @@
                       label="&newtab.undo.restoreButton;"
                       class="newtab-undo-button" />
           <xul:toolbarbutton id="newtab-undo-close-button" tabindex="-1"
+                             class="close-icon"
                              tooltiptext="&newtab.undo.closeTooltip;" />
         </div>
       </div>

browser/base/content/sync/notification.xml

@@ -83,7 +83,7 @@
     <content>
       <xul:hbox class="notification-inner outset" flex="1" xbl:inherits="type">
         <xul:toolbarbutton ondblclick="event.stopPropagation();"
-                           class="messageCloseButton tabbable"
+                           class="messageCloseButton close-icon tabbable"
                            xbl:inherits="hidden=hideclose"
                            tooltiptext="&closeNotification.tooltip;"
                            oncommand="document.getBindingParent(this).close()"/>

browser/base/content/tab-shape.inc.svg

@@ -0,0 +1,11 @@
+<!-- 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/. -->
+
+<svg:clipPath id="tab-curve-clip-path-start" clipPathUnits="objectBoundingBox">
+  <svg:path d="m 1,0.0625 0.05,0 0,0.938 -1,0 0,-0.028 C 0.32082458,0.95840561 0.4353096,0.81970962 0.48499998,0.5625 0.51819998,0.3905 0.535,0.0659 1,0.0625 z"/>
+</svg:clipPath>
+
+<svg:clipPath id="tab-curve-clip-path-end" clipPathUnits="objectBoundingBox">
+  <svg:path d="m 0,0.0625 -0.05,0 0,0.938 1,0 0,-0.028 C 0.67917542,0.95840561 0.56569036,0.81970962 0.51599998,0.5625 0.48279998,0.3905 0.465,0.0659 0,0.0625 z"/>
+</svg:clipPath>

browser/base/content/tabbrowser.css

@@ -41,6 +41,7 @@ tabpanels {
   z-index: 2;
 }
 
+.tab-icon-image:not([src]):not([pinned]),
 .tab-throbber:not([busy]),
 .tab-throbber[busy] + .tab-icon-image {
   display: none;

browser/base/content/tabbrowser.xml

@@ -207,8 +207,7 @@
           if (!window.gShowPageResizers)
             return;
 
-          var show = document.getElementById("addon-bar").collapsed &&
+          var show = window.windowState == window.STATE_NORMAL;
-                     window.windowState == window.STATE_NORMAL;
           for (let i = 0; i < this.browsers.length; i++) {
             this.browsers[i].showWindowResizer = show;
           }
@@ -999,7 +998,7 @@
             this.mCurrentTab = this.tabContainer.selectedItem;
             this.showTab(this.mCurrentTab);
 
-            var backForwardContainer = document.getElementById("unified-back-forward-button");
+            var backForwardContainer = document.getElementById("urlbar-container");
             if (backForwardContainer) {
               backForwardContainer.setAttribute("switchingtabs", "true");
               window.addEventListener("MozAfterPaint", function removeSwitchingtabsAttr() {
@@ -1495,8 +1494,7 @@
             if (remote)
               b.setAttribute("remote", "true");
 
-            if (window.gShowPageResizers && document.getElementById("addon-bar").collapsed &&
+            if (window.gShowPageResizers && window.windowState == window.STATE_NORMAL) {
-                window.windowState == window.STATE_NORMAL) {
               b.setAttribute("showresizer", "true");
             }
 
@@ -1920,6 +1918,11 @@
             aTab.closing = true;
             this._removingTabs.push(aTab);
             this._visibleTabs = null; // invalidate cache
+
+            // Invalidate hovered tab state tracking for this closing tab.
+            if (this.tabContainer._hoveredTab == aTab)
+              aTab._mouseleave();
+
             if (newTab)
               this.addTab(BROWSER_NEW_TAB_URL, {skipAnimation: true});
             else
@@ -3238,6 +3241,28 @@
           return !tab.pinned && !tab.hidden;
         ]]></body>
       </method>
+      <field name="_tabMarginLeft">null</field>
+      <field name="_tabMarginRight">null</field>
+      <method name="_adjustElementStartAndEnd">
+        <parameter name="aTab"/>
+        <parameter name="tabStart"/>
+        <parameter name="tabEnd"/>
+        <body><![CDATA[
+          if (this._tabMarginLeft === null || this._tabMarginRight === null) {
+            let tabMiddle = document.getAnonymousElementByAttribute(aTab, "class", "tab-background-middle");
+            let tabMiddleStyle = window.getComputedStyle(tabMiddle, null);
+            this._tabMarginLeft = parseFloat(tabMiddleStyle.marginLeft);
+            this._tabMarginRight = parseFloat(tabMiddleStyle.marginRight);
+          }
+          if (this._tabMarginLeft < 0) {
+            tabStart = tabStart + this._tabMarginLeft;
+          }
+          if (this._tabMarginRight < 0) {
+            tabEnd = tabEnd - this._tabMarginRight;
+          }
+          return [tabStart, tabEnd];
+        ]]></body>
+      </method>
     </implementation>
 
     <handlers>
@@ -3259,8 +3284,11 @@
       <handler event="overflow"><![CDATA[
         if (event.detail == 0)
           return; // Ignore vertical events
-
         var tabs = document.getBindingParent(this);
+        var numberOfTabs = tabs.tabbrowser.visibleTabs.length;
+        if (numberOfTabs == 1)
+          return;
+
         tabs.setAttribute("overflow", "true");
         tabs._positionPinnedTabs();
         tabs._handleTabSelect(false);
@@ -3357,6 +3385,15 @@
       <field name="_afterSelectedTab">null</field>
       <field name="_beforeHoveredTab">null</field>
       <field name="_afterHoveredTab">null</field>
+      <field name="_hoveredTab">null</field>
+
+      <property name="_isCustomizing" readonly="true">
+        <getter>
+          let root = document.documentElement;
+          return root.getAttribute("customizing") == "true" ||
+                 root.getAttribute("customize-exiting") == "true";
+        </getter>
+      </property>
 
       <method name="_setPositionalAttributes">
         <body><![CDATA[
@@ -3387,6 +3424,12 @@
             this._lastTab.removeAttribute("last-visible-tab");
           this._lastTab = visibleTabs[lastVisible];
           this._lastTab.setAttribute("last-visible-tab", "true");
+
+          let hoveredTab = this._hoveredTab;
+          if (hoveredTab) {
+            hoveredTab._mouseleave();
+            hoveredTab._mouseenter();
+          }
         ]]></body>
       </method>
 
@@ -3465,10 +3508,6 @@
           document.getElementById("menu_close").setAttribute("label",
             this.tabbrowser.mStringBundle.getString(visible ? "tabs.closeTab" : "tabs.close"));
 
-          goSetCommandEnabled("cmd_ToggleTabsOnTop", visible);
-
-          TabsOnTop.syncUI();
-
           TabsInTitlebar.allowedBy("tabs-visible", visible);
         ]]></body>
       </method>
@@ -3820,16 +3859,16 @@
               if (aEvent.target != window)
                 break;
 
-              let sizemode = document.documentElement.getAttribute("sizemode");
+              TabsInTitlebar.updateAppearance();
-              TabsInTitlebar.allowedBy("sizemode",
-                                       sizemode == "maximized" || sizemode == "fullscreen");
 
-              var width = this.mTabstrip.boxObject.width;
+              if (this.tabbrowser.visibleTabs.length > 1) {
-              if (width != this.mTabstripWidth) {
+                var width = this.mTabstrip.boxObject.width;
-                this.adjustTabstrip();
+                if (width != this.mTabstripWidth) {
-                this._fillTrailingGap();
+                  this.adjustTabstrip();
-                this._handleTabSelect();
+                  this._fillTrailingGap();
-                this.mTabstripWidth = width;
+                  this._handleTabSelect();
+                  this.mTabstripWidth = width;
+                }
               }
 
               this.tabbrowser.updateWindowResizers();
@@ -4123,8 +4162,7 @@
         // When the tabbar has an unified appearance with the titlebar
         // and menubar, a double-click in it should have the same behavior
         // as double-clicking the titlebar
-        if (TabsInTitlebar.enabled ||
+        if (TabsInTitlebar.enabled || this.parentNode._dragBindingAlive)
-            (TabsOnTop.enabled && this.parentNode._dragBindingAlive))
           return;
 #endif
 
@@ -4247,7 +4285,7 @@
 
       <handler event="dragstart"><![CDATA[
         var tab = this._getDragTargetTab(event);
-        if (!tab)
+        if (!tab || this._isCustomizing)
           return;
 
         let dt = event.dataTransfer;
@@ -4491,7 +4529,7 @@
 
         var dt = event.dataTransfer;
         var draggedTab = dt.mozGetDataAt(TAB_DROP_TYPE, 0);
-        if (dt.mozUserCancelled || dt.dropEffect != "none") {
+        if (dt.mozUserCancelled || dt.dropEffect != "none" || this._isCustomizing) {
           delete draggedTab._dragData;
           return;
         }
@@ -4623,7 +4661,7 @@
                      role="presentation"/>
           <xul:toolbarbutton anonid="close-button"
                              xbl:inherits="fadein,pinned,selected"
-                             class="tab-close-button"/>
+                             class="tab-close-button close-icon"/>
         </xul:hbox>
       </xul:stack>
     </content>
@@ -4644,6 +4682,54 @@
       <field name="mCorrespondingMenuitem">null</field>
       <field name="closing">false</field>
       <field name="lastAccessed">0</field>
+
+      <method name="_mouseenter">
+        <body><![CDATA[
+          if (this.closing)
+            return;
+
+          let tabContainer = this.parentNode;
+          let visibleTabs = tabContainer.tabbrowser.visibleTabs;
+          let tabIndex = visibleTabs.indexOf(this);
+          if (tabIndex == 0) {
+            tabContainer._beforeHoveredTab = null;
+          } else {
+            let candidate = visibleTabs[tabIndex - 1];
+            if (!candidate.selected) {
+              tabContainer._beforeHoveredTab = candidate;
+              candidate.setAttribute("beforehovered", "true");
+            }
+          }
+
+          if (tabIndex == visibleTabs.length - 1) {
+            tabContainer._afterHoveredTab = null;
+          } else {
+            let candidate = visibleTabs[tabIndex + 1];
+            if (!candidate.selected) {
+              tabContainer._afterHoveredTab = candidate;
+              candidate.setAttribute("afterhovered", "true");
+            }
+          }
+
+          tabContainer._hoveredTab = this;
+        ]]></body>
+      </method>
+
+      <method name="_mouseleave">
+        <body><![CDATA[
+          let tabContainer = this.parentNode;
+          if (tabContainer._beforeHoveredTab) {
+            tabContainer._beforeHoveredTab.removeAttribute("beforehovered");
+            tabContainer._beforeHoveredTab = null;
+          }
+          if (tabContainer._afterHoveredTab) {
+            tabContainer._afterHoveredTab.removeAttribute("afterhovered");
+            tabContainer._afterHoveredTab = null;
+          }
+
+          tabContainer._hoveredTab = null;
+        ]]></body>
+      </method>
     </implementation>
 
     <handlers>
@@ -4652,47 +4738,14 @@
         if (anonid == "close-button")
           this.mOverCloseButton = true;
 
-        let tab = event.target;
+        this._mouseenter();
-        if (tab.closing)
-          return;
-
-        let tabContainer = this.parentNode;
-        let visibleTabs = tabContainer.tabbrowser.visibleTabs;
-        let tabIndex = visibleTabs.indexOf(tab);
-        if (tabIndex == 0) {
-          tabContainer._beforeHoveredTab = null;
-        } else {
-          let candidate = visibleTabs[tabIndex - 1];
-          if (!candidate.selected) {
-            tabContainer._beforeHoveredTab = candidate;
-            candidate.setAttribute("beforehovered", "true");
-          }
-        }
-
-        if (tabIndex == visibleTabs.length - 1) {
-          tabContainer._afterHoveredTab = null;
-        } else {
-          let candidate = visibleTabs[tabIndex + 1];
-          if (!candidate.selected) {
-            tabContainer._afterHoveredTab = candidate;
-            candidate.setAttribute("afterhovered", "true");
-          }
-        }
       ]]></handler>
       <handler event="mouseout"><![CDATA[
         let anonid = event.originalTarget.getAttribute("anonid");
         if (anonid == "close-button")
           this.mOverCloseButton = false;
 
-        let tabContainer = this.parentNode;
+        this._mouseleave();
-        if (tabContainer._beforeHoveredTab) {
-          tabContainer._beforeHoveredTab.removeAttribute("beforehovered");
-          tabContainer._beforeHoveredTab = null;
-        }
-        if (tabContainer._afterHoveredTab) {
-          tabContainer._afterHoveredTab.removeAttribute("afterhovered");
-          tabContainer._afterHoveredTab = null;
-        }
       ]]></handler>
       <handler event="dragstart" phase="capturing">
         this.style.MozUserFocus = '';

browser/base/content/test/general/browser.ini

@@ -17,7 +17,6 @@ support-files =
   bug792517.html
   bug792517.sjs
   bug839103.css
-  disablechrome.html
   discovery.html
   domplate_test.js
   download_page.html
@@ -93,9 +92,6 @@ support-files =
 [browser_aboutHome.js]
 [browser_aboutSyncProgress.js]
 [browser_addKeywordSearch.js]
-[browser_addon_bar_aomlistener.js]
-[browser_addon_bar_close_button.js]
-[browser_addon_bar_shortcut.js]
 [browser_alltabslistener.js]
 [browser_blob-channelname.js]
 [browser_bug304198.js]
@@ -166,10 +162,7 @@ support-files =
 [browser_bug595507.js]
 [browser_bug596687.js]
 [browser_bug597218.js]
-[browser_bug598923.js]
-[browser_bug599325.js]
 [browser_bug609700.js]
-[browser_bug616836.js]
 [browser_bug623155.js]
 [browser_bug623893.js]
 [browser_bug624734.js]
@@ -215,9 +208,7 @@ support-files =
 [browser_contentAreaClick.js]
 [browser_contextSearchTabPosition.js]
 [browser_ctrlTab.js]
-[browser_customize.js]
 [browser_customize_popupNotification.js]
-[browser_disablechrome.js]
 [browser_discovery.js]
 [browser_duplicateIDs.js]
 [browser_findbarClose.js]
@@ -288,6 +279,7 @@ support-files =
 [browser_visibleTabs_bookmarkAllTabs.js]
 [browser_visibleTabs_contextMenu.js]
 [browser_visibleTabs_tabPreview.js]
+[browser_windowopen_reflows.js]
 [browser_wyciwyg_urlbarCopying.js]
 [browser_zbug569342.js]
 [browser_registerProtocolHandler_notification.js]

browser/base/content/test/general/browser_addon_bar.js

@@ -1,63 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-function test() {
-  waitForExplicitFinish();
-
-  let addonbar = document.getElementById("addon-bar");
-  ok(addonbar.collapsed, "addon bar is collapsed by default");
-
-  let topMenu, toolbarMenu;
-
-  function onTopMenuShown(event) {
-    ok(1, "top menu popupshown listener called");
-    event.currentTarget.removeEventListener("popupshown", arguments.callee, false);
-    // open the customize or toolbars menu
-    toolbarMenu = document.getElementById("appmenu_customizeMenu") ||
-                      document.getElementById("viewToolbarsMenu").firstElementChild;
-    toolbarMenu.addEventListener("popupshown", onToolbarMenuShown, false);
-    toolbarMenu.addEventListener("popuphidden", onToolbarMenuHidden, false);
-    toolbarMenu.openPopup();
-  }
-
-  function onTopMenuHidden(event) {
-    ok(1, "top menu popuphidden listener called");
-    event.currentTarget.removeEventListener("popuphidden", arguments.callee, false);
-    finish();
-  }
-
-  function onToolbarMenuShown(event) {
-    ok(1, "sub menu popupshown listener called");
-    event.currentTarget.removeEventListener("popupshown", arguments.callee, false);
-
-    // test the menu item's default state
-    let menuitem = document.getElementById("toggle_addon-bar");
-    ok(menuitem, "found the menu item");
-    is(menuitem.getAttribute("checked"), "false", "menuitem is not checked by default");
-
-    // click on the menu item
-    // TODO: there's got to be a way to check+command in one shot
-    menuitem.setAttribute("checked", "true");
-    menuitem.click();
-
-    // now the addon bar should be visible and the menu checked
-    is(addonbar.getAttribute("collapsed"), "false", "addon bar is visible after executing the command");
-    is(menuitem.getAttribute("checked"), "true", "menuitem is checked after executing the command");
-
-    toolbarMenu.hidePopup();
-  }
-
-  function onToolbarMenuHidden(event) {
-    ok(1, "toolbar menu popuphidden listener called");
-    event.currentTarget.removeEventListener("popuphidden", arguments.callee, false);
-    topMenu.hidePopup();
-  }
-
-  // open the appmenu or view menu
-  topMenu = document.getElementById("appmenu-popup") ||
-            document.getElementById("menu_viewPopup");
-  topMenu.addEventListener("popupshown", onTopMenuShown, false);
-  topMenu.addEventListener("popuphidden", onTopMenuHidden, false);
-  topMenu.openPopup();
-}

browser/base/content/test/general/browser_addon_bar_aomlistener.js

@@ -1,67 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-function test() {
-
-  let addonbar = document.getElementById("addon-bar");
-  ok(addonbar.collapsed, "addon bar is collapsed by default");
-
-  function addItem(id) {
-    let button = document.createElement("toolbarbutton");
-    button.id = id;
-    let palette = document.getElementById("navigator-toolbox").palette;
-    palette.appendChild(button);
-    addonbar.insertItem(id, null, null, false);
-  }
-
-  // call onInstalling
-  AddonsMgrListener.onInstalling();
-
-  // add item to the bar
-  let id = "testbutton";
-  addItem(id);
-
-  // call onInstalled
-  AddonsMgrListener.onInstalled();
-
-  // confirm bar is visible
-  ok(!addonbar.collapsed, "addon bar is not collapsed after toggle");
-
-  // call onUninstalling
-  AddonsMgrListener.onUninstalling();
-
-  // remove item from the bar
-  addonbar.currentSet = addonbar.currentSet.replace("," + id, "");
-
-  // call onUninstalled
-  AddonsMgrListener.onUninstalled();
-
-  // confirm bar is not visible
-  ok(addonbar.collapsed, "addon bar is collapsed after toggle");
-
-  // call onEnabling
-  AddonsMgrListener.onEnabling();
-
-  // add item to the bar
-  let id = "testbutton";
-  addItem(id);
-
-  // call onEnabled
-  AddonsMgrListener.onEnabled();
-
-  // confirm bar is visible
-  ok(!addonbar.collapsed, "addon bar is not collapsed after toggle");
-
-  // call onDisabling
-  AddonsMgrListener.onDisabling();
-
-  // remove item from the bar
-  addonbar.currentSet = addonbar.currentSet.replace("," + id, "");
-
-  // call onDisabled
-  AddonsMgrListener.onDisabled();
-
-  // confirm bar is not visible
-  ok(addonbar.collapsed, "addon bar is collapsed after toggle");
-}

browser/base/content/test/general/browser_addon_bar_close_button.js

@@ -1,19 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-function test() {
-  let addonbar = document.getElementById("addon-bar");
-  ok(addonbar.collapsed, "addon bar is collapsed by default");
-
-  // make add-on bar visible
-  setToolbarVisibility(addonbar, true);
-  ok(!addonbar.collapsed, "addon bar is not collapsed after toggle");
-
-  // click the close button
-  let closeButton = document.getElementById("addonbar-closebutton");
-  EventUtils.synthesizeMouseAtCenter(closeButton, {});
-
-  // confirm addon bar is closed
-  ok(addonbar.collapsed, "addon bar is collapsed after clicking close button");
-}

browser/base/content/test/general/browser_addon_bar_shortcut.js

@@ -1,18 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-function test() {
-  let addonbar = document.getElementById("addon-bar");
-  ok(addonbar.collapsed, "addon bar is collapsed by default");
-
-  // show the add-on bar
-  EventUtils.synthesizeKey("/", { accelKey: true }, window);
-  ok(!addonbar.collapsed, "addon bar is not collapsed after toggle");
-
-  // hide the add-on bar
-  EventUtils.synthesizeKey("/", { accelKey: true }, window);
-
-  // confirm addon bar is closed
-  ok(addonbar.collapsed, "addon bar is collapsed after toggle");
-}

browser/base/content/test/general/browser_bug462289.js

@@ -34,16 +34,9 @@ function step3()
   is(gBrowser.selectedTab, tab1, "2nd click on selected tab1 keeps tab selected");
   isnot(document.activeElement, tab1, "2nd click on selected tab1 does not activate tab");
 
-  if (gNavToolbox.getAttribute("tabsontop") == "true") {
+  ok(true, "focusing URLBar then sending 1 Shift+Tab.");
-    ok(true, "[tabsontop=true] focusing URLBar then sending 1 Shift+Tab.");
+  gURLBar.focus();
-    gURLBar.focus();
+  EventUtils.synthesizeKey("VK_TAB", {shiftKey: true});
-    EventUtils.synthesizeKey("VK_TAB", {shiftKey: true});
-  } else {
-    ok(true, "[tabsontop=false] focusing SearchBar then sending Tab(s) until out of nav-bar.");
-    document.getElementById("searchbar").focus();
-    while (focus_in_navbar())
-      EventUtils.synthesizeKey("VK_TAB", { });
-  }
   is(gBrowser.selectedTab, tab1, "tab key to selected tab1 keeps tab selected");
   is(document.activeElement, tab1, "tab key to selected tab1 activates tab");
 

browser/base/content/test/general/browser_bug598923.js

@@ -1,33 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
- * http://creativecommons.org/publicdomain/zero/1.0/
- */
-
-// Test:
-// * if add-on is installed to the add-on bar, the bar is made visible.
-// * if add-on is uninstalled from the add-on bar, and no more add-ons there,
-//   the bar is hidden.
-
-function test() {
-  let aml = AddonsMgrListener;
-  ok(aml, "AddonsMgrListener exists");
-  // check is hidden
-  is(aml.addonBar.collapsed, true, "add-on bar is hidden initially");
-  // aob gets the count
-  AddonsMgrListener.onInstalling();
-  // add an item
-  let element = document.createElement("toolbaritem");
-  element.id = "bug598923-addon-item";
-  aml.addonBar.appendChild(element);
-  // aob checks the count, makes visible
-  AddonsMgrListener.onInstalled();
-  // check is visible
-  is(aml.addonBar.collapsed, false, "add-on bar has been made visible");
-  // aob gets the count
-  AddonsMgrListener.onUninstalling();
-  // remove an item
-  aml.addonBar.removeChild(element);
-  // aob checks the count, makes hidden
-  AddonsMgrListener.onUninstalled();
-  // check is hidden
-  is(aml.addonBar.collapsed, true, "add-on bar is hidden again");
-}

browser/base/content/test/general/browser_bug599325.js

@@ -1,21 +0,0 @@
-function test() {
-  waitForExplicitFinish();
-
-  let addonBar = document.getElementById("addon-bar");
-  ok(addonBar, "got addon bar");
-  ok(!isElementVisible(addonBar), "addon bar initially hidden");
-
-  openToolbarCustomizationUI(function () {
-    ok(isElementVisible(addonBar),
-       "add-on bar is visible during toolbar customization");
-
-    closeToolbarCustomizationUI(onClose);
-  });
-
-  function onClose() {
-    ok(!isElementVisible(addonBar),
-       "addon bar is hidden after toolbar customization");
-
-    finish();
-  }
-}

browser/base/content/test/general/browser_bug616836.js

@@ -1,4 +0,0 @@
-function test() {
-  is(document.querySelectorAll("#appmenu-popup [accesskey]").length, 0,
-     "there should be no items with access keys in the app menu popup");
-}

browser/base/content/test/general/browser_bug624734.js

@@ -4,6 +4,15 @@
 
 // Bug 624734 - Star UI has no tooltip until bookmarked page is visited
 
+function finishTest() {
+  is(BookmarkingUI.button.getAttribute("buttontooltiptext"),
+     BookmarkingUI._unstarredTooltip,
+     "Star icon should have the unstarred tooltip text");
+
+  gBrowser.removeCurrentTab();
+  finish();
+}
+
 function test() {
   waitForExplicitFinish();
 
@@ -11,12 +20,11 @@ function test() {
   tab.linkedBrowser.addEventListener("load", (function(event) {
     tab.linkedBrowser.removeEventListener("load", arguments.callee, true);
 
-    is(BookmarkingUI.star.getAttribute("tooltiptext"),
+    if (BookmarkingUI.status == BookmarkingUI.STATUS_UPDATING) {
-       BookmarkingUI._unstarredTooltip,
+      waitForCondition(function() BookmarkingUI.status != BookmarkingUI.STATUS_UPDATING, finishTest, "BookmarkingUI was updating for too long");
-       "Star icon should have the unstarred tooltip text");
+    } else {
-  
+      finishTest();
-    gBrowser.removeCurrentTab();
+    }
-    finish();
   }), true);
 
   tab.linkedBrowser.loadURI("http://example.com/browser/browser/base/content/test/general/dummy_page.html");

browser/base/content/test/general/browser_customize.js

@@ -1,24 +0,0 @@
-function test() {
-  waitForExplicitFinish();
-
-  openToolbarCustomizationUI(customizationWindowLoaded);
-}
-
-function customizationWindowLoaded(win) {
-  let x = win.screenX;
-  let iconModeList = win.document.getElementById("modelist");
-
-  iconModeList.addEventListener("popupshown", function popupshown() {
-    iconModeList.removeEventListener("popupshown", popupshown, false);
-
-    executeSoon(function () {
-      is(win.screenX, x,
-         "toolbar customization window shouldn't move when the iconmode menulist is opened");
-      iconModeList.open = false;
-    
-      closeToolbarCustomizationUI(finish);
-    });
-  }, false);
-
-  iconModeList.open = true;
-}

browser/base/content/test/general/browser_disablechrome.js

@@ -1,216 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
- * http://creativecommons.org/publicdomain/zero/1.0/
- */
-
-// Tests that the disablechrome attribute gets propogated to the main UI
-
-const HTTPSRC = "http://example.com/browser/browser/base/content/test/general/";
-
-function is_element_hidden(aElement) {
-  var style = window.getComputedStyle(document.getElementById("nav-bar"), "");
-  if (style.visibility != "visible" || style.display == "none")
-    return true;
-
-  if (aElement.ownerDocument != aElement.parentNode)
-    return is_element_hidden(aElement.parentNode);
-
-  return false;
-}
-
-function is_chrome_hidden() {
-  is(document.documentElement.getAttribute("disablechrome"), "true", "Attribute should be set");
-  if (TabsOnTop.enabled)
-    ok(is_element_hidden(document.getElementById("nav-bar")), "Toolbar should be hidden");
-  else
-    ok(!is_element_hidden(document.getElementById("nav-bar")), "Toolbar should not be hidden");
-}
-
-function is_chrome_visible() {
-  isnot(document.getElementById("main-window").getAttribute("disablechrome"), "true", "Attribute should not be set");
-  ok(!is_element_hidden(document.getElementById("nav-bar")), "Toolbar should not be hidden");
-}
-
-function load_page(aURL, aCanHide, aCallback) {
-  gNewBrowser.addEventListener("pageshow", function() {
-    // Filter out about:blank loads
-    if (gNewBrowser.currentURI.spec != aURL)
-      return;
-
-    gNewBrowser.removeEventListener("pageshow", arguments.callee, false);
-
-    if (aCanHide)
-      is_chrome_hidden();
-    else
-      is_chrome_visible();
-
-    if (aURL == "about:addons") {
-      function check_after_init() {
-        if (aCanHide)
-          is_chrome_hidden();
-        else
-          is_chrome_visible();
-
-        aCallback();
-      }
-
-      if (gNewBrowser.contentWindow.gIsInitializing) {
-        gNewBrowser.contentDocument.addEventListener("Initialized", function() {
-          gNewBrowser.contentDocument.removeEventListener("Initialized", arguments.callee, false);
-
-          check_after_init();
-        }, false);
-      }
-      else {
-        check_after_init();
-      }
-    }
-    else {
-      executeSoon(aCallback);
-    }
-  }, false);
-  gNewBrowser.loadURI(aURL);
-}
-
-var gOldTab;
-var gNewTab;
-var gNewBrowser;
-
-function test() {
-  // Opening the add-ons manager and waiting for it to load the discovery pane
-  // takes more time in windows debug builds
-  requestLongerTimeout(2);
-
-  var gOldTabsOnTop = TabsOnTop.enabled;
-  registerCleanupFunction(function() {
-    TabsOnTop.enabled = gOldTabsOnTop;
-  });
-
-  waitForExplicitFinish();
-
-  gOldTab = gBrowser.selectedTab;
-  gNewTab = gBrowser.selectedTab = gBrowser.addTab("about:blank");
-  gNewBrowser = gBrowser.selectedBrowser;
-
-  info("Tabs on top");
-  TabsOnTop.enabled = true;
-
-  run_http_test_1();
-}
-
-function end_test() {
-  gBrowser.removeTab(gNewTab);
-  finish();
-}
-
-function test_url(aURL, aCanHide, aNextTest) {
-  is_chrome_visible();
-  info("Page load");
-  load_page(aURL, aCanHide, function() {
-    info("Switch away");
-    gBrowser.selectedTab = gOldTab;
-    is_chrome_visible();
-
-    info("Switch back");
-    gBrowser.selectedTab = gNewTab;
-    if (aCanHide)
-      is_chrome_hidden();
-    else
-      is_chrome_visible();
-
-    gBrowser.removeTab(gNewTab);
-    gNewTab = gBrowser.selectedTab = gBrowser.addTab("about:blank");
-    gNewBrowser = gBrowser.selectedBrowser;
-
-    gBrowser.selectedTab = gOldTab;
-
-    info("Background load");
-    load_page(aURL, false, function() {
-      info("Switch back");
-      gBrowser.selectedTab = gNewTab;
-      if (aCanHide)
-        is_chrome_hidden();
-      else
-        is_chrome_visible();
-
-      load_page("about:blank", false, aNextTest);
-    });
-  });
-}
-
-// Should never hide the chrome
-function run_http_test_1() {
-  info("HTTP tests");
-  test_url(HTTPSRC + "disablechrome.html", false, run_chrome_about_test);
-}
-
-// Should hide the chrome
-function run_chrome_about_test() {
-  info("Chrome about: tests");
-  test_url("about:addons", true, function() {
-    info("Tabs on bottom");
-    TabsOnTop.enabled = false;
-    run_http_test_2();
-  });
-}
-
-// Should never hide the chrome
-function run_http_test_2() {
-  info("HTTP tests");
-  test_url(HTTPSRC + "disablechrome.html", false, run_chrome_about_test_2);
-}
-
-// Should not hide the chrome
-function run_chrome_about_test_2() {
-  info("Chrome about: tests");
-  test_url("about:addons", true, run_http_test3);
-}
-
-function run_http_test3() {
-  info("HTTP tests");
-  test_url(HTTPSRC + "disablechrome.html", false, run_chrome_about_test_3);
-}
-
-// Should not hide the chrome
-function run_chrome_about_test_3() {
-  info("Chrome about: tests");
-  test_url("about:Addons", true, function(){
-    info("Tabs on top");
-    TabsOnTop.enabled = true;
-    run_http_test4();
-  });
-}
-
-function run_http_test4() {
-  info("HTTP tests");
-  test_url(HTTPSRC + "disablechrome.html", false, run_chrome_about_test_4);
-}
-
-function run_chrome_about_test_4() {
-  info("Chrome about: tests");
-  test_url("about:Addons", true, run_http_test5);
- }
-
-function run_http_test5() {
-  info("HTTP tests");
-  test_url(HTTPSRC + "disablechrome.html", false, run_chrome_about_test_5);
-}
-
-// Should hide the chrome
-function run_chrome_about_test_5() {
-  info("Chrome about: tests");
-  test_url("about:preferences", true, function(){
-    info("Tabs on bottom");
-    TabsOnTop.enabled = false;
-    run_http_test6();
-  });
-}
-
-function run_http_test6() {
-  info("HTTP tests");
-  test_url(HTTPSRC + "disablechrome.html", false, run_chrome_about_test_6);
-}
-
-function run_chrome_about_test_6() {
-  info("Chrome about: tests");
-  test_url("about:preferences", true, end_test);
-}

browser/base/content/test/general/browser_overflowScroll.js

@@ -7,8 +7,8 @@ function rect(ele)           ele.getBoundingClientRect();
 function width(ele)          rect(ele).width;
 function left(ele)           rect(ele).left;
 function right(ele)          rect(ele).right;
-function isLeft(ele, msg)    is(left(ele), left(scrollbox), msg);
+function isLeft(ele, msg)    is(left(ele) + tabstrip._tabMarginLeft, left(scrollbox), msg);
-function isRight(ele, msg)   is(right(ele), right(scrollbox), msg);
+function isRight(ele, msg)   is(right(ele) - tabstrip._tabMarginRight, right(scrollbox), msg);
 function elementFromPoint(x) tabstrip._elementFromPoint(x);
 function nextLeftElement()   elementFromPoint(left(scrollbox) - 1);
 function nextRightElement()  elementFromPoint(right(scrollbox) + 1);
@@ -62,7 +62,11 @@ function runOverflowTests(aEvent) {
   EventUtils.synthesizeMouse(upButton, 1, 1, {});
   isLeft(element, "Scrolled one tab to the left with a single click");
 
-  element = elementFromPoint(left(scrollbox) - width(scrollbox));
+  let elementPoint = left(scrollbox) - width(scrollbox);
+  element = elementFromPoint(elementPoint);
+  if (elementPoint == right(element)) {
+    element = element.nextSibling;
+  }
   EventUtils.synthesizeMouse(upButton, 1, 1, {clickCount: 2});
   isLeft(element, "Scrolled one page of tabs with a double click");
 

browser/base/content/test/general/browser_windowopen_reflows.js

@@ -0,0 +1,115 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const EXPECTED_REFLOWS = [
+  // handleEvent flushes layout to get the tabstrip width after a resize.
+  "handleEvent@chrome://browser/content/tabbrowser.xml|",
+
+  // Loading a tab causes a reflow.
+  "loadTabs@chrome://browser/content/tabbrowser.xml|" +
+    "loadOneOrMoreURIs@chrome://browser/content/browser.js|" +
+    "gBrowserInit._delayedStartup@chrome://browser/content/browser.js|",
+
+  // Selecting the address bar causes a reflow.
+  "select@chrome://global/content/bindings/textbox.xml|" +
+    "focusAndSelectUrlBar@chrome://browser/content/browser.js|" +
+    "gBrowserInit._delayedStartup@chrome://browser/content/browser.js|",
+
+  // Focusing the content area causes a reflow.
+  "gBrowserInit._delayedStartup@chrome://browser/content/browser.js|",
+
+  // Sometimes sessionstore collects data during this test, which causes a sync reflow
+  // (https://bugzilla.mozilla.org/show_bug.cgi?id=892154 will fix this)
+  "ssi_getWindowDimension@resource:///modules/sessionstore/SessionStore.jsm",
+];
+
+if (Services.appinfo.OS == "Darwin") {
+  // TabsInTitlebar._update causes a reflow on OS X trying to do calculations
+  // since layout info is already dirty. This doesn't seem to happen before
+  // MozAfterPaint on other platforms.
+  EXPECTED_REFLOWS.push("rect@chrome://browser/content/browser.js|" +
+                          "TabsInTitlebar._update@chrome://browser/content/browser.js|" +
+                          "updateAppearance@chrome://browser/content/browser.js|" +
+                          "handleEvent@chrome://browser/content/tabbrowser.xml|");
+
+  // _onOverflow causes a reflow getting widths.
+  EXPECTED_REFLOWS.push("OverflowableToolbar.prototype._onOverflow@resource:///modules/CustomizableUI.jsm|" +
+                        "OverflowableToolbar.prototype.init@resource:///modules/CustomizableUI.jsm|" +
+                        "OverflowableToolbar.prototype.observe@resource:///modules/CustomizableUI.jsm|" +
+                        "gBrowserInit._delayedStartup@chrome://browser/content/browser.js|");
+  // Same as above since in packaged builds there are no function names and the resource URI includes "app"
+  EXPECTED_REFLOWS.push("@resource://app/modules/CustomizableUI.jsm|" +
+                          "@resource://app/modules/CustomizableUI.jsm|" +
+                          "@resource://app/modules/CustomizableUI.jsm|" +
+                          "gBrowserInit._delayedStartup@chrome://browser/content/browser.js|");
+}
+
+/*
+ * This test ensures that there are no unexpected
+ * uninterruptible reflows when opening new windows.
+ */
+function test() {
+  waitForExplicitFinish();
+
+  // Add a reflow observer and open a new window
+  let win = OpenBrowserWindow();
+  let docShell = win.QueryInterface(Ci.nsIInterfaceRequestor)
+                    .getInterface(Ci.nsIWebNavigation)
+                    .QueryInterface(Ci.nsIDocShell);
+  docShell.addWeakReflowObserver(observer);
+
+  // Wait until the mozafterpaint event occurs.
+  waitForMozAfterPaint(win, function paintListener() {
+    // Remove reflow observer and clean up.
+    docShell.removeWeakReflowObserver(observer);
+    win.close();
+
+    finish();
+  });
+}
+
+let observer = {
+  reflow: function (start, end) {
+    // Gather information about the current code path.
+    let stack = new Error().stack;
+    let path = stack.split("\n").slice(1).map(line => {
+      return line.replace(/:\d+$/, "");
+    }).join("|");
+    let pathWithLineNumbers = (new Error().stack).split("\n").slice(1).join("|");
+
+    // Stack trace is empty. Reflow was triggered by native code.
+    if (path === "") {
+      return;
+    }
+
+    // Check if this is an expected reflow.
+    for (let expectedStack of EXPECTED_REFLOWS) {
+      if (path.startsWith(expectedStack) ||
+          // Accept an empty function name for gBrowserInit._delayedStartup or TabsInTitlebar._update to workaround bug 906578.
+          path.startsWith(expectedStack.replace(/(^|\|)(gBrowserInit\._delayedStartup|TabsInTitlebar\._update)@/, "$1@"))) {
+        ok(true, "expected uninterruptible reflow '" + expectedStack + "'");
+        return;
+      }
+    }
+
+    ok(false, "unexpected uninterruptible reflow '" + pathWithLineNumbers + "'");
+  },
+
+  reflowInterruptible: function (start, end) {
+    // We're not interested in interruptible reflows.
+  },
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIReflowObserver,
+                                         Ci.nsISupportsWeakReference])
+};
+
+function waitForMozAfterPaint(win, callback) {
+  win.addEventListener("MozAfterPaint", function onEnd(event) {
+    if (event.target != win)
+      return;
+    win.removeEventListener("MozAfterPaint", onEnd);
+    executeSoon(callback);
+  });
+}

browser/base/content/test/general/disablechrome.html

@@ -1,4 +0,0 @@
-<html>
-<body>
-</body>
-</html>

browser/base/content/test/general/head.js

@@ -37,49 +37,27 @@ function updateTabContextMenu(tab) {
   menu.hidePopup();
 }
 
-function findToolbarCustomizationWindow(aBrowserWin) {
-  if (!aBrowserWin)
-    aBrowserWin = window;
-
-  let iframe = aBrowserWin.document.getElementById("customizeToolbarSheetIFrame");
-  let win = iframe && iframe.contentWindow;
-  if (win)
-    return win;
-
-  win = findChromeWindowByURI("chrome://global/content/customizeToolbar.xul");
-  if (win && win.opener == aBrowserWin)
-    return win;
-
-  throw Error("Failed to find the customization window");
-}
-
 function openToolbarCustomizationUI(aCallback, aBrowserWin) {
   if (!aBrowserWin)
     aBrowserWin = window;
 
-  aBrowserWin.document.getElementById("cmd_CustomizeToolbars").doCommand();
+  aBrowserWin.gCustomizeMode.enter();
 
-  aBrowserWin.gNavToolbox.addEventListener("beforecustomization", function UI_loaded() {
+  aBrowserWin.gNavToolbox.addEventListener("customizationready", function UI_loaded() {
-    aBrowserWin.gNavToolbox.removeEventListener("beforecustomization", UI_loaded);
+    aBrowserWin.gNavToolbox.removeEventListener("customizationready", UI_loaded);
-
+    executeSoon(function() {
-    let win = findToolbarCustomizationWindow(aBrowserWin);
+      aCallback(aBrowserWin)
-    waitForFocus(function () {
+    });
-      aCallback(win);
-    }, win);
   });
 }
 
 function closeToolbarCustomizationUI(aCallback, aBrowserWin) {
-  let win = findToolbarCustomizationWindow(aBrowserWin);
+  aBrowserWin.gNavToolbox.addEventListener("aftercustomization", function unloaded() {
-
+    aBrowserWin.gNavToolbox.removeEventListener("aftercustomization", unloaded);
-  win.addEventListener("unload", function unloaded() {
-    win.removeEventListener("unload", unloaded);
     executeSoon(aCallback);
   });
 
-  let button = win.document.getElementById("donebutton");
+  aBrowserWin.gCustomizeMode.exit();
-  button.focus();
-  button.doCommand();
 }
 
 function waitForCondition(condition, nextTest, errorMsg) {

browser/base/content/urlbarBindings.xml

@@ -937,7 +937,7 @@
             <xul:menupopup anonid="menupopup"
                            xbl:inherits="oncommand=menucommand">
               <children/>
-              <xul:menuitem class="menuitem-iconic popup-notification-closeitem"
+              <xul:menuitem class="menuitem-iconic popup-notification-closeitem close-icon"
                             label="&closeNotificationItem.label;"
                             xbl:inherits="oncommand=closeitemcommand"/>
             </xul:menupopup>
@@ -946,7 +946,7 @@
       </xul:vbox>
       <xul:vbox pack="start">
         <xul:toolbarbutton anonid="closebutton"
-                           class="messageCloseButton popup-notification-closebutton tabbable"
+                           class="messageCloseButton close-icon popup-notification-closebutton tabbable"
                            xbl:inherits="oncommand=closebuttoncommand"
                            tooltiptext="&closeNotification.tooltip;"/>
       </xul:vbox>
@@ -1169,7 +1169,7 @@
             <xul:menupopup anonid="menupopup"
                            xbl:inherits="oncommand=menucommand">
               <children/>
-              <xul:menuitem class="menuitem-iconic popup-notification-closeitem"
+              <xul:menuitem class="menuitem-iconic popup-notification-closeitem close-icon"
                             label="&closeNotificationItem.label;"
                             xbl:inherits="oncommand=closeitemcommand"/>
             </xul:menupopup>
@@ -1178,7 +1178,7 @@
       </xul:vbox>
       <xul:vbox pack="start">
         <xul:toolbarbutton anonid="closebutton"
-                           class="messageCloseButton popup-notification-closebutton tabbable"
+                           class="messageCloseButton close-icon popup-notification-closebutton tabbable"
                            xbl:inherits="oncommand=closebuttoncommand"
                            tooltiptext="&closeNotification.tooltip;"/>
       </xul:vbox>
@@ -1508,7 +1508,7 @@
             <xul:label class="text-link click-to-play-plugins-notification-link" anonid="click-to-play-plugins-notification-link" />
           </xul:description>
           <xul:toolbarbutton anonid="closebutton"
-                             class="messageCloseButton popup-notification-closebutton tabbable"
+                             class="messageCloseButton popup-notification-closebutton tabbable close-icon"
                              xbl:inherits="oncommand=closebuttoncommand"
                              tooltiptext="&closeNotification.tooltip;"/>
         </xul:hbox>
@@ -2027,7 +2027,7 @@
                              onclick="document.getBindingParent(this).onLinkClick();"/>
           </xul:description>
         </xul:hbox>
-        <xul:toolbarbutton class="panel-promo-closebutton"
+        <xul:toolbarbutton class="panel-promo-closebutton close-icon"
                            oncommand="document.getBindingParent(this).onCloseButtonCommand();"
                            tooltiptext="&closeNotification.tooltip;"/>
       </xul:hbox>

browser/base/jar.mn

@@ -13,8 +13,7 @@ browser.jar:
 #endif
 %  overlay chrome://global/content/viewSource.xul chrome://browser/content/viewSourceOverlay.xul
 %  overlay chrome://global/content/viewPartialSource.xul chrome://browser/content/viewSourceOverlay.xul
-%  style chrome://global/content/customizeToolbar.xul chrome://browser/content/browser.css
+
-%  style chrome://global/content/customizeToolbar.xul chrome://browser/skin/
 *       content/browser/aboutDialog.xul               (content/aboutDialog.xul)
 *       content/browser/aboutDialog.js                (content/aboutDialog.js)
         content/browser/aboutDialog.css               (content/aboutDialog.css)

browser/branding/nightly/branding.nsi

@@ -8,7 +8,7 @@
 
 # BrandFullNameInternal is used for some registry and file system values
 # instead of BrandFullName and typically should not be modified.
-!define BrandFullNameInternal "Nightly"
+!define BrandFullNameInternal "UX"
 !define CompanyName           "mozilla.org"
 !define URLInfoAbout          "http://www.mozilla.org"
 !define URLUpdateInfo         "http://www.mozilla.org/projects/firefox"

browser/branding/nightly/configure.sh

@@ -2,4 +2,4 @@
 # 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/.
 
-MOZ_APP_DISPLAYNAME=Nightly
+MOZ_APP_DISPLAYNAME=UX

browser/branding/nightly/locales/en-US/brand.dtd

@@ -2,7 +2,7 @@
    - 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/. -->
 
-<!ENTITY  brandShortName        "Nightly">
+<!ENTITY  brandShortName        "UX">
-<!ENTITY  brandFullName         "Nightly">
+<!ENTITY  brandFullName         "UX">
 <!ENTITY  vendorShortName       "Mozilla">
 <!ENTITY  trademarkInfo.part1   " ">

browser/branding/nightly/locales/en-US/brand.properties

@@ -2,8 +2,8 @@
 # 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/.
 
-brandShortName=Nightly
+brandShortName=UX
-brandFullName=Nightly
+brandFullName=UX
 vendorShortName=Mozilla
 
 syncBrandShortName=Sync

browser/components/about/AboutRedirector.cpp

@@ -92,6 +92,8 @@ static RedirEntry kRedirMap[] = {
 #endif
   { "app-manager", "chrome://browser/content/devtools/app-manager/index.xul",
     nsIAboutModule::ALLOW_SCRIPT },
+  { "customizing", "chrome://browser/content/customizableui/aboutCustomizing.xhtml",
+    nsIAboutModule::ALLOW_SCRIPT },
 };
 static const int kRedirTotal = NS_ARRAY_LENGTH(kRedirMap);
 

browser/components/build/nsModule.cpp

@@ -110,6 +110,7 @@ static const mozilla::Module::ContractIDEntry kBrowserContracts[] = {
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "healthreport", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
 #endif
     { NS_ABOUT_MODULE_CONTRACTID_PREFIX "app-manager", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
+    { NS_ABOUT_MODULE_CONTRACTID_PREFIX "customizing", &kNS_BROWSER_ABOUT_REDIRECTOR_CID },
 #if defined(XP_WIN)
     { NS_IEHISTORYENUMERATOR_CONTRACTID, &kNS_WINIEHISTORYENUMERATOR_CID },
 #elif defined(XP_MACOSX)

browser/components/customizableui/content/aboutCustomizing.xhtml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<!DOCTYPE html [
+  <!ENTITY % htmlDTD
+    PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+    "DTD/xhtml1-strict.dtd">
+  %htmlDTD;
+  <!ENTITY % brandDTD SYSTEM "chrome://branding/locale/brand.dtd">
+  %brandDTD;
+  <!ENTITY % browserDTD SYSTEM "chrome://browser/locale/browser.dtd">
+  %browserDTD;
+]>
+
+<html xmlns="http://www.w3.org/1999/xhtml"
+      disablefastfind="true">
+	<head>
+		<title>&customizeMode.tabTitle;</title>
+	</head>
+	<body></body>
+</html>

browser/components/customizableui/content/customizeMode.inc.xul

@@ -0,0 +1,28 @@
+<!-- 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/. -->
+
+<hbox id="customization-container" flex="1" hidden="true">
+  <vbox flex="1" id="customization-palette-container">
+    <label id="customization-header" value="&customizeMode.menuAndToolbars.header;"/>
+    <vbox id="customization-palette" flex="1"/>
+    <hbox pack="start">
+      <button id="customization-reset-button" oncommand="gCustomizeMode.reset();" label="&customizeMode.restoreDefaults;" class="customizationmode-button"/>
+    </hbox>
+  </vbox>
+  <vbox id="customization-panel-container">
+    <vbox id="customization-panelWrapper">
+      <html:style html:type="text/html" scoped="scoped">
+        @import url(chrome://global/skin/popup.css);
+      </html:style>
+      <box class="panel-arrowbox">
+        <box flex="1"/>
+        <image class="panel-arrow" side="top"/>
+      </box>
+      <box class="panel-arrowcontent" side="top" flex="1">
+        <hbox id="customization-panelHolder"/>
+        <box class="panel-inner-arrowcontentfooter" hidden="true"/>
+      </box>
+    </vbox>
+  </vbox>
+</hbox>

browser/components/customizableui/content/jar.mn

@@ -0,0 +1,11 @@
+# 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/.
+
+browser.jar:
+  content/browser/customizableui/aboutCustomizing.xhtml
+  content/browser/customizableui/panelUI.css
+  content/browser/customizableui/panelUI.js
+  content/browser/customizableui/panelUI.xml
+  content/browser/customizableui/toolbar.xml
+

browser/components/customizableui/content/moz.build

@@ -0,0 +1,6 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+

browser/components/customizableui/content/panelUI.css

@@ -0,0 +1,31 @@
+/* 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/. */
+
+.panel-viewstack[viewtype="main"] > .panel-clickcapturer {
+  pointer-events: none;
+}
+
+.panel-mainview,
+.panel-viewcontainer,
+.panel-viewstack {
+  overflow: hidden;
+}
+
+.panel-viewstack {
+  position: relative;
+}
+
+.panel-subviews {
+  -moz-stack-sizing: ignore;
+  transform: translateX(0);
+  overflow-y: auto;
+}
+
+.panel-subviews[panelopen] {
+  transition: transform 150ms;
+}
+
+.panel-viewcontainer[panelopen]:-moz-any(:not([viewtype="main"]),[transitioning="true"]) {
+  transition: height 150ms;
+}

browser/components/customizableui/content/panelUI.inc.xul

@@ -0,0 +1,154 @@
+<!-- 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/. -->
+
+<panel id="PanelUI-popup"
+       role="group"
+       type="arrow"
+       level="top"
+       hidden="true"
+       consumeoutsideclicks="true"
+       noautofocus="true">
+  <panelmultiview id="PanelUI-multiView" mainViewId="PanelUI-mainView">
+    <panelview id="PanelUI-mainView" contextmenu="customizationPanelContextMenu">
+      <vbox id="PanelUI-contents-scroller">
+        <vbox id="PanelUI-contents"/>
+      </vbox>
+
+      <footer id="PanelUI-footer">
+        <!-- The parentNode is used so that the footer is presented as the anchor
+             instead of just the button being the anchor. -->
+        <toolbarbutton id="PanelUI-help" label="&helpMenu.label;" tabindex="0"
+                       oncommand="PanelUI.showHelpView(this.parentNode);"/>
+        <toolbarbutton id="PanelUI-customize" label="&appMenuCustomize.label;" tabindex="0"
+                       oncommand="gCustomizeMode.toggle();"/>
+        <toolbarbutton id="PanelUI-quit" tabindex="0"
+#ifdef XP_WIN
+                       label="&quitApplicationCmdWin.label;"
+#else
+                       label="&quitApplicationCmd.label;"
+#endif
+                       command="cmd_quitApplication"/>
+      </footer>
+    </panelview>
+
+    <panelview id="PanelUI-history" flex="1">
+      <label value="&appMenuHistory.label;"/>
+      <toolbarbutton id="appMenuClearRecentHistory" tabindex="0"
+                     label="&appMenuHistory.clearRecent.label;"
+                     command="Tools:Sanitize"/>
+      <toolbarbutton id="appMenuRestoreLastSession" tabindex="0"
+                     label="&appMenuHistory.restoreSession.label;"
+                     command="Browser:RestoreLastSession"/>
+      <menuseparator id="PanelUI-recentlyClosedTabs-separator"/>
+      <vbox id="PanelUI-recentlyClosedTabs"/>
+      <menuseparator id="PanelUI-recentlyClosedWindows-separator"/>
+      <vbox id="PanelUI-recentlyClosedWindows"/>
+      <menuseparator id="PanelUI-historyItems-separator"/>
+      <vbox id="PanelUI-historyItems"/>
+      <label value="&appMenuHistory.showAll.label;"
+             id="PanelUI-historyMore"
+             class="text-link"
+             onclick="PlacesCommandHook.showPlacesOrganizer('History'); CustomizableUI.hidePanelForNode(this);"/>
+    </panelview>
+
+    <panelview id="PanelUI-bookmarks" flex="1">
+      <toolbarbutton id="panelMenuBookmarkThisPage"
+                     label="&bookmarkThisPageCmd.label;"
+                     command="Browser:AddBookmarkAs"
+                     onclick="PanelUI.hide();"/>
+      <toolbarseparator/>
+      <toolbarbutton id="panelMenu_showAllBookmarks"
+                     label="&showAllBookmarks2.label;"
+                     command="Browser:ShowAllBookmarks"
+                     onclick="PanelUI.hide();"/>
+      <toolbarbutton id="panelMenu_viewBookmarksSidebar"
+                     label="&viewBookmarksSidebar2.label;"
+                     oncommand="toggleSidebar('viewBookmarksSidebar'); PanelUI.hide();">
+        <observes element="viewBookmarksSidebar" attribute="checked"/>
+      </toolbarbutton>
+      <toolbarbutton id="panelMenu_viewBookmarksToolbar"
+                     label="&viewBookmarksToolbar.label;"
+                     type="checkbox"
+                     toolbarId="PersonalToolbar"
+                     oncommand="onViewToolbarCommand(event); PanelUI.hide();"/>
+      <toolbarseparator/>
+      <toolbarbutton id="panelMenu_bookmarksToolbar"
+                     label="&personalbarCmd.label;"
+                     oncommand="PlacesCommandHook.showPlacesOrganizer('BookmarksToolbar'); PanelUI.hide();"/>
+      <toolbarbutton id="panelMenu_unsortedBookmarks"
+                     label="&unsortedBookmarksCmd.label;"
+                     oncommand="PlacesCommandHook.showPlacesOrganizer('UnfiledBookmarks'); PanelUI.hide();"/>
+      <toolbarseparator/>
+      <toolbaritem id="panelMenu_bookmarksMenu"
+                   flex="1"
+                   orient="vertical"
+                   smoothscroll="false"
+                   onclick="if (event.button == 1) BookmarkingUI.onPanelMenuViewCommand(event, this._placesView);"
+                   oncommand="BookmarkingUI.onPanelMenuViewCommand(event, this._placesView);"
+                   flatList="true"
+                   tooltip="bhTooltip">
+        <!-- bookmarks menu items -->
+      </toolbaritem>
+
+    </panelview>
+
+    <panelview id="PanelUI-feeds" flex="1" oncommand="FeedHandler.subscribeToFeed(null, event);"></panelview>
+
+    <panelview id="PanelUI-helpView" flex="1">
+      <label value="&helpMenu.label;"/>
+      <vbox id="PanelUI-helpItems"/>
+    </panelview>
+
+    <panelview id="PanelUI-developer" flex="1">
+      <label value="&webDeveloperMenu.label;"/>
+      <vbox id="PanelUI-developerItems"/>
+    </panelview>
+
+    <panelview id="PanelUI-characterEncodingView" flex="1">
+      <label value="&charsetMenu.label;"/>
+      <toolbarbutton label="&charsetCustomize.label;"
+                     oncommand="PanelUI.onCharsetCustomizeCommand();"/>
+
+      <vbox id="PanelUI-characterEncodingView-customlist"
+            class="PanelUI-characterEncodingView-list"/>
+      <vbox>
+        <label value="&charsetMenuAutodet.label;"/>
+        <vbox id="PanelUI-characterEncodingView-autodetect"
+              class="PanelUI-characterEncodingView-list"/>
+      </vbox>
+    </panelview>
+
+  </panelmultiview>
+  <popupset id="customizationContextMenus">
+    <menupopup id="customizationContextMenu">
+      <menuitem oncommand="gCustomizeMode.addToToolbar(document.popupNode)"
+                accesskey="&customizeMenu.addToToolbar.accesskey;"
+                label="&customizeMenu.addToToolbar.label;"/>
+      <menuitem oncommand="gCustomizeMode.removeFromPanel(document.popupNode)"
+                accesskey="&customizeMenu.removeFromMenu.accesskey;"
+                label="&customizeMenu.removeFromMenu.label;"/>
+      <menuseparator/>
+      <menuitem command="cmd_CustomizeToolbars"
+                accesskey="&viewCustomizeToolbar.accesskey;"
+                label="&viewCustomizeToolbar.label;"/>
+    </menupopup>
+
+    <menupopup id="customizationPanelContextMenu">
+      <menuitem command="cmd_CustomizeToolbars"
+                accesskey="&customizeMenu.addMoreItems.accesskey;"
+                label="&customizeMenu.addMoreItems.label;"/>
+    </menupopup>
+  </popupset>
+</panel>
+
+<panel id="widget-overflow"
+       role="group"
+       type="arrow"
+       level="top"
+       hidden="true"
+       consumeoutsideclicks="true">
+  <vbox id="widget-overflow-scroller">
+    <vbox id="widget-overflow-list"/>
+  </vbox>
+</panel>

browser/components/customizableui/content/panelUI.js

@@ -0,0 +1,399 @@
+/* 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/. */
+
+XPCOMUtils.defineLazyModuleGetter(this, "CustomizableUI",
+                                  "resource:///modules/CustomizableUI.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "ScrollbarSampler",
+                                  "resource:///modules/ScrollbarSampler.jsm");
+/**
+ * Maintains the state and dispatches events for the main menu panel.
+ */
+
+const PanelUI = {
+  /** Panel events that we listen for. **/
+  get kEvents() ["popupshowing", "popupshown", "popuphiding", "popuphidden"],
+  /**
+   * Used for lazily getting and memoizing elements from the document. Lazy
+   * getters are set in init, and memoizing happens after the first retrieval.
+   */
+  get kElements() {
+    return {
+      contents: "PanelUI-contents",
+      mainView: "PanelUI-mainView",
+      multiView: "PanelUI-multiView",
+      helpView: "PanelUI-helpView",
+      menuButton: "PanelUI-menu-button",
+      panel: "PanelUI-popup",
+      scroller: "PanelUI-contents-scroller"
+    };
+  },
+
+  init: function() {
+    for (let [k, v] of Iterator(this.kElements)) {
+      // Need to do fresh let-bindings per iteration
+      let getKey = k;
+      let id = v;
+      this.__defineGetter__(getKey, function() {
+        delete this[getKey];
+        return this[getKey] = document.getElementById(id);
+      });
+    }
+
+    this.menuButton.addEventListener("mousedown", this);
+    this.menuButton.addEventListener("keypress", this);
+  },
+
+  _eventListenersAdded: false,
+  _ensureEventListenersAdded: function() {
+    if (this._eventListenersAdded)
+      return;
+    this._addEventListeners();
+  },
+
+  _addEventListeners: function() {
+    for (let event of this.kEvents) {
+      this.panel.addEventListener(event, this);
+    }
+
+    this.helpView.addEventListener("ViewShowing", this._onHelpViewShow, false);
+    this.helpView.addEventListener("ViewHiding", this._onHelpViewHide, false);
+    this._eventListenersAdded = true;
+  },
+
+  uninit: function() {
+    if (!this._eventListenersAdded) {
+      return;
+    }
+
+    for (let event of this.kEvents) {
+      this.panel.removeEventListener(event, this);
+    }
+    this.helpView.removeEventListener("ViewShowing", this._onHelpViewShow);
+    this.helpView.removeEventListener("ViewHiding", this._onHelpViewHide);
+    this.menuButton.removeEventListener("mousedown", this);
+    this.menuButton.removeEventListener("keypress", this);
+  },
+
+  /**
+   * Customize mode extracts the mainView and puts it somewhere else while the
+   * user customizes. Upon completion, this function can be called to put the
+   * panel back to where it belongs in normal browsing mode.
+   *
+   * @param aMainView
+   *        The mainView node to put back into place.
+   */
+  setMainView: function(aMainView) {
+    this._ensureEventListenersAdded();
+    this.multiView.setMainView(aMainView);
+  },
+
+  /**
+   * Opens the menu panel if it's closed, or closes it if it's
+   * open.
+   *
+   * @param aEvent the event that triggers the toggle.
+   */
+  toggle: function(aEvent) {
+    // Don't show the panel if the window is in customization mode,
+    // since this button doubles as an exit path for the user in this case.
+    if (document.documentElement.hasAttribute("customizing")) {
+      return;
+    }
+    this._ensureEventListenersAdded();
+    if (this.panel.state == "open") {
+      this.hide();
+    } else if (this.panel.state == "closed") {
+      this.show(aEvent);
+    }
+  },
+
+  /**
+   * Opens the menu panel. If the event target has a child with the
+   * toolbarbutton-icon attribute, the panel will be anchored on that child.
+   * Otherwise, the panel is anchored on the event target itself.
+   *
+   * @param aEvent the event (if any) that triggers showing the menu.
+   */
+  show: function(aEvent) {
+    if (this.panel.state == "open" || this.panel.state == "showing" ||
+        document.documentElement.hasAttribute("customizing")) {
+      return;
+    }
+
+    this.ensureReady().then(() => {
+      this.panel.hidden = false;
+      let editControlPlacement = CustomizableUI.getPlacementOfWidget("edit-controls");
+      if (editControlPlacement && editControlPlacement.area == CustomizableUI.AREA_PANEL) {
+        updateEditUIVisibility();
+      }
+
+      let anchor;
+      if (aEvent.type == "mousedown" ||
+          aEvent.type == "command") {
+        anchor = this.menuButton;
+      } else {
+        anchor = aEvent.target;
+      }
+      let iconAnchor =
+        document.getAnonymousElementByAttribute(anchor, "class",
+                                                "toolbarbutton-icon");
+
+      // Only focus the panel if it's opened using the keyboard, so that
+      // cut/copy/paste buttons will work for mouse users.
+      let keyboardOpened = aEvent.sourceEvent &&
+                           aEvent.sourceEvent.target.localName == "key";
+      this.panel.setAttribute("noautofocus", !keyboardOpened);
+      this.panel.openPopup(iconAnchor || anchor, "bottomcenter topright");
+    });
+  },
+
+  /**
+   * If the menu panel is being shown, hide it.
+   */
+  hide: function() {
+    if (document.documentElement.hasAttribute("customizing")) {
+      return;
+    }
+
+    this.panel.hidePopup();
+  },
+
+  handleEvent: function(aEvent) {
+    switch (aEvent.type) {
+      case "popupshowing":
+        // Fall through
+      case "popupshown":
+        // Fall through
+      case "popuphiding":
+        // Fall through
+      case "popuphidden": {
+        this._updatePanelButton(aEvent.target);
+        break;
+      }
+      case "mousedown":
+        // Fall through
+      case "keypress":
+        this.toggle(aEvent);
+        break;
+    }
+  },
+
+  /**
+   * Registering the menu panel is done lazily for performance reasons. This
+   * method is exposed so that CustomizationMode can force panel-readyness in the
+   * event that customization mode is started before the panel has been opened
+   * by the user.
+   *
+   * @param aCustomizing (optional) set to true if this was called while entering
+   *        customization mode. If that's the case, we trust that customization
+   *        mode will handle calling beginBatchUpdate and endBatchUpdate.
+   *
+   * @return a Promise that resolves once the panel is ready to roll.
+   */
+  ensureReady: function(aCustomizing=false) {
+    if (this._readyPromise) {
+      return this._readyPromise;
+    }
+    this._readyPromise = Task.spawn(function() {
+      if (!this._scrollWidth) {
+        // In order to properly center the contents of the panel, while ensuring
+        // that we have enough space on either side to show a scrollbar, we have to
+        // do a bit of hackery. In particular, we calculate a new width for the
+        // scroller, based on the system scrollbar width.
+        this._scrollWidth =
+          (yield ScrollbarSampler.getSystemScrollbarWidth()) + "px";
+        let cstyle = window.getComputedStyle(this.scroller);
+        let widthStr = cstyle.width;
+        // Get the calculated padding on the left and right sides of
+        // the scroller too. We'll use that in our final calculation so
+        // that if a scrollbar appears, we don't have the contents right
+        // up against the edge of the scroller.
+        let paddingLeft = cstyle.paddingLeft;
+        let paddingRight = cstyle.paddingRight;
+        let calcStr = [widthStr, this._scrollWidth,
+                       paddingLeft, paddingRight].join(" + ");
+        this.scroller.style.width = "calc(" + calcStr + ")";
+      }
+
+      if (aCustomizing) {
+        CustomizableUI.registerMenuPanel(this.contents);
+      } else {
+        this.beginBatchUpdate();
+        CustomizableUI.registerMenuPanel(this.contents);
+        this.endBatchUpdate();
+      }
+    }.bind(this)).then(null, Cu.reportError);
+
+    return this._readyPromise;
+  },
+
+  /**
+   * Switch the panel to the main view if it's not already
+   * in that view.
+   */
+  showMainView: function() {
+    this._ensureEventListenersAdded();
+    this.multiView.showMainView();
+  },
+
+  /**
+   * Switch the panel to the help view if it's not already
+   * in that view.
+   */
+  showHelpView: function(aAnchor) {
+    this._ensureEventListenersAdded();
+    this.multiView.showSubView("PanelUI-helpView", aAnchor);
+  },
+
+  /**
+   * Shows a subview in the panel with a given ID.
+   *
+   * @param aViewId the ID of the subview to show.
+   * @param aAnchor the element that spawned the subview.
+   * @param aPlacementArea the CustomizableUI area that aAnchor is in.
+   */
+  showSubView: function(aViewId, aAnchor, aPlacementArea) {
+    this._ensureEventListenersAdded();
+    let viewNode = document.getElementById(aViewId);
+    if (!viewNode) {
+      Cu.reportError("Could not show panel subview with id: " + aViewId);
+      return;
+    }
+
+    if (!aAnchor) {
+      Cu.reportError("Expected an anchor when opening subview with id: " + aViewId);
+      return;
+    }
+
+    if (aPlacementArea == CustomizableUI.AREA_PANEL) {
+      this.multiView.showSubView(aViewId, aAnchor);
+    } else if (!aAnchor.open) {
+      aAnchor.open = true;
+      // Emit the ViewShowing event so that the widget definition has a chance
+      // to lazily populate the subview with things.
+      let evt = document.createEvent("CustomEvent");
+      evt.initCustomEvent("ViewShowing", true, true, viewNode);
+      viewNode.dispatchEvent(evt);
+      if (evt.defaultPrevented) {
+        return;
+      }
+
+      let tempPanel = document.createElement("panel");
+      tempPanel.setAttribute("type", "arrow");
+      tempPanel.setAttribute("id", "customizationui-widget-panel");
+      tempPanel.setAttribute("level", "top");
+      document.getElementById(CustomizableUI.AREA_NAVBAR).appendChild(tempPanel);
+
+      let multiView = document.createElement("panelmultiview");
+      tempPanel.appendChild(multiView);
+      multiView.setMainView(viewNode);
+      CustomizableUI.addPanelCloseListeners(tempPanel);
+
+      let panelRemover = function() {
+        tempPanel.removeEventListener("popuphidden", panelRemover);
+        CustomizableUI.removePanelCloseListeners(tempPanel);
+        let evt = new CustomEvent("ViewHiding", {detail: viewNode});
+        viewNode.dispatchEvent(evt);
+        aAnchor.open = false;
+
+        this.multiView.appendChild(viewNode);
+        tempPanel.parentElement.removeChild(tempPanel);
+      }.bind(this);
+      tempPanel.addEventListener("popuphidden", panelRemover);
+
+      let iconAnchor =
+        document.getAnonymousElementByAttribute(aAnchor, "class",
+                                                "toolbarbutton-icon");
+
+      tempPanel.openPopup(iconAnchor || aAnchor, "bottomcenter topright");
+    }
+  },
+
+  /**
+   * This function can be used as a command event listener for subviews
+   * so that the panel knows if and when to close itself.
+   */
+  onCommandHandler: function(aEvent) {
+    if (!aEvent.originalTarget.hasAttribute("noautoclose")) {
+      PanelUI.hide();
+    }
+  },
+
+  /**
+   * Open a dialog window that allow the user to customize listed character sets.
+   */
+  onCharsetCustomizeCommand: function() {
+    this.hide();
+    window.openDialog("chrome://global/content/customizeCharset.xul",
+                      "PrefWindow",
+                      "chrome,modal=yes,resizable=yes",
+                      "browser");
+  },
+
+  /** 
+   * Signal that we're about to make a lot of changes to the contents of the
+   * panels all at once. For performance, we ignore the mutations.
+   */
+  beginBatchUpdate: function() {
+    this._ensureEventListenersAdded();
+    this.multiView.ignoreMutations = true;
+  },
+
+  /**
+   * Signal that we're done making bulk changes to the panel. We now pay
+   * attention to mutations. This automatically synchronizes the multiview
+   * container with whichever view is displayed if the panel is open.
+   */
+  endBatchUpdate: function(aReason) {
+    this._ensureEventListenersAdded();
+    this.multiView.ignoreMutations = false;
+  },
+
+  /**
+   * Sets the anchor node into the open or closed state, depending
+   * on the state of the panel.
+   */
+  _updatePanelButton: function() {
+    this.menuButton.open = this.panel.state == "open" ||
+                           this.panel.state == "showing";
+  },
+
+  _onHelpViewShow: function(aEvent) {
+    // Call global menu setup function
+    buildHelpMenu();
+
+    let helpMenu = document.getElementById("menu_HelpPopup");
+    let items = this.getElementsByTagName("vbox")[0];
+    let attrs = ["oncommand", "onclick", "label", "key", "disabled"];
+    let NSXUL = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
+
+    // Remove all buttons from the view
+    while (items.firstChild) {
+      items.removeChild(items.firstChild);
+    }
+
+    // Add the current set of menuitems of the Help menu to this view
+    let menuItems = Array.prototype.slice.call(helpMenu.getElementsByTagName("menuitem"));
+    let fragment = document.createDocumentFragment();
+    for (let node of menuItems) {
+      if (node.hidden)
+        continue;
+      let button = document.createElementNS(NSXUL, "toolbarbutton");
+      // Copy specific attributes from a menuitem of the Help menu
+      for (let attrName of attrs) {
+        if (!node.hasAttribute(attrName))
+          continue;
+        button.setAttribute(attrName, node.getAttribute(attrName));
+      }
+      fragment.appendChild(button);
+    }
+    items.appendChild(fragment);
+
+    this.addEventListener("command", PanelUI.onCommandHandler);
+  },
+
+  _onHelpViewHide: function(aEvent) {
+    this.removeEventListener("command", PanelUI.onCommandHandler);
+  }
+};

browser/components/customizableui/content/panelUI.xml

@@ -0,0 +1,342 @@
+<?xml version="1.0"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<bindings id="browserPanelUIBindings"
+          xmlns="http://www.mozilla.org/xbl"
+          xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+          xmlns:xbl="http://www.mozilla.org/xbl">
+
+  <binding id="panelmultiview">
+    <resources>
+      <stylesheet src="chrome://browser/content/customizableui/panelUI.css"/>
+    </resources>
+    <content>
+      <xul:box anonid="viewContainer" class="panel-viewcontainer" xbl:inherits="panelopen,viewtype,transitioning">
+        <xul:stack anonid="viewStack" xbl:inherits="viewtype" viewtype="main" class="panel-viewstack">
+          <xul:vbox anonid="mainViewContainer" class="panel-mainview"/>
+
+          <!-- Used to capture click events over the PanelUI-mainView if we're in
+               subview mode. That way, any click on the PanelUI-mainView causes us
+               to revert to the mainView mode, whereupon PanelUI-click-capture then
+               allows click events to go through it. -->
+          <xul:vbox anonid="clickCapturer" class="panel-clickcapturer"/>
+
+          <!-- We manually set display: none (via a CSS attribute selector) on the
+               subviews that are not being displayed. We're using this over a deck
+               because a deck assumes the size of its largest child, regardless of
+               whether or not it is shown. That's not good for our case, since we
+               want to allow each subview to be uniquely sized. -->
+          <xul:vbox anonid="subViews" class="panel-subviews" xbl:inherits="panelopen">
+            <children includes="panelview"/>
+          </xul:vbox>
+        </xul:stack>
+      </xul:box>
+    </content>
+    <implementation implements="nsIDOMEventListener">
+      <field name="_clickCapturer" readonly="true">
+        document.getAnonymousElementByAttribute(this, "anonid", "clickCapturer");
+      </field>
+      <field name="_viewContainer" readonly="true">
+        document.getAnonymousElementByAttribute(this, "anonid", "viewContainer");
+      </field>
+      <field name="_mainViewContainer" readonly="true">
+        document.getAnonymousElementByAttribute(this, "anonid", "mainViewContainer");
+      </field>
+      <field name="_subViews" readonly="true">
+        document.getAnonymousElementByAttribute(this, "anonid", "subViews");
+      </field>
+      <field name="_viewStack" readonly="true">
+        document.getAnonymousElementByAttribute(this, "anonid", "viewStack");
+      </field>
+      <field name="_panel" readonly="true">
+        this.parentNode;
+      </field>
+
+      <field name="_currentSubView">null</field>
+      <field name="_anchorElement">null</field>
+      <field name="_mainViewHeight">0</field>
+      <field name="_subViewObserver">null</field>
+      <field name="__transitioning">false</field>
+      <field name="_ignoreMutations">false</field>
+
+      <property name="showingSubView" readonly="true"
+                onget="return this._viewStack.getAttribute('viewtype') == 'subview'"/>
+      <property name="_mainViewId" onget="return this.getAttribute('mainViewId');" onset="this.setAttribute('mainViewId', val); return val;"/>
+      <property name="_mainView" readonly="true"
+                onget="return this._mainViewId ? document.getElementById(this._mainViewId) : null;"/>
+
+      <property name="ignoreMutations">
+        <getter>
+          return this._ignoreMutations;
+        </getter>
+        <setter><![CDATA[
+          this._ignoreMutations = val;
+          if (!val && this._panel.state == "open") {
+            if (this.showingSubView) {
+              this._syncContainerWithSubView();
+            } else {
+              this._syncContainerWithMainView();
+            }
+          }
+        ]]></setter>
+      </property>
+
+      <property name="_transitioning">
+        <getter>
+          return this.__transitioning;
+        </getter>
+        <setter><![CDATA[
+          this.__transitioning = val;
+          if (val) {
+            this.setAttribute("transitioning", "true");
+          } else {
+            this.removeAttribute("transitioning");
+          }
+        ]]></setter>
+      </property>
+      <constructor><![CDATA[
+        this._clickCapturer.addEventListener("click", this);
+        this._panel.addEventListener("popupshowing", this);
+        this._panel.addEventListener("popupshown", this);
+        this._panel.addEventListener("popuphidden", this);
+        this._subViews.addEventListener("overflow", this);
+        this._mainViewContainer.addEventListener("overflow", this);
+
+        // Get a MutationObserver ready to react to subview size changes. We
+        // only attach this MutationObserver when a subview is being displayed.
+        this._subViewObserver =
+          new MutationObserver(this._syncContainerWithSubView.bind(this));
+        this._mainViewObserver =
+          new MutationObserver(this._syncContainerWithMainView.bind(this));
+
+        this._mainViewContainer.setAttribute("panelid",
+                                             this._panel.id);
+
+        if (this._mainView) {
+          this.setMainView(this._mainView);
+        }
+        this.setAttribute("viewtype", "main");
+      ]]></constructor>
+
+      <destructor><![CDATA[
+        if (this._mainView) {
+          this._mainView.removeAttribute("mainview");
+        }
+        this._mainViewObserver.disconnect();
+        this._subViewObserver.disconnect();
+        this._panel.removeEventListener("popupshowing", this);
+        this._panel.removeEventListener("popupshown", this);
+        this._panel.removeEventListener("popuphidden", this);
+        this._subViews.removeEventListener("overflow", this);
+        this._mainViewContainer.removeEventListener("overflow", this);
+        this._clickCapturer.removeEventListener("click", this);
+      ]]></destructor>
+
+      <method name="setMainView">
+        <parameter name="aNewMainView"/>
+        <body><![CDATA[
+        if (this._mainView) {
+          this._mainViewObserver.disconnect();
+          this._subViews.appendChild(this._mainView);
+          this._mainView.removeAttribute("mainview");
+        }
+        this._mainViewId = aNewMainView.id;
+        aNewMainView.setAttribute("mainview", "true");
+        this._mainViewContainer.appendChild(aNewMainView);
+        ]]></body>
+      </method>
+
+      <method name="showMainView">
+        <body><![CDATA[
+          if (this.showingSubView) {
+            let viewNode = this._currentSubView;
+            let evt = document.createEvent("CustomEvent");
+            evt.initCustomEvent("ViewHiding", true, true, viewNode);
+            viewNode.dispatchEvent(evt);
+
+            viewNode.removeAttribute("current");
+            this._currentSubView = null;
+
+            this._subViewObserver.disconnect();
+
+            this._transitioning = true;
+
+            this._viewContainer.addEventListener("transitionend", function trans() {
+              this._viewContainer.removeEventListener("transitionend", trans);
+              this._transitioning = false;
+            }.bind(this));
+            this._viewContainer.style.height = this._mainViewHeight + "px";
+
+            this.setAttribute("viewtype", "main");
+          }
+
+          this._mainViewObserver.observe(this._mainView, {
+            attributes: true,
+            characterData: true,
+            childList: true,
+            subtree: true
+          });
+
+          this._shiftMainView();
+        ]]></body>
+      </method>
+
+      <method name="showSubView">
+        <parameter name="aViewId"/>
+        <parameter name="aAnchor"/>
+        <body><![CDATA[
+          let viewNode = this.querySelector("#" + aViewId);
+          viewNode.setAttribute("current", true);
+          // Emit the ViewShowing event so that the widget definition has a chance
+          // to lazily populate the subview with things.
+          let evt = document.createEvent("CustomEvent");
+          evt.initCustomEvent("ViewShowing", true, true, viewNode);
+          viewNode.dispatchEvent(evt);
+          if (evt.defaultPrevented) {
+            return;
+          }
+
+          this._currentSubView = viewNode;
+
+          // Now we have to transition to transition the panel. There are a few parts
+          // to this:
+          //
+          // 1) The main view content gets shifted so that the center of the anchor
+          //    node is at the left-most edge of the panel.
+          // 2) The subview deck slides in so that it takes up almost all of the
+          //    panel.
+          // 3) If the subview is taller then the main panel contents, then the panel
+          //    must grow to meet that new height. Otherwise, it must shrink.
+          //
+          // All three of these actions make use of CSS transformations, so they
+          // should all occur simultaneously.
+          this.setAttribute("viewtype", "subview");
+          this._shiftMainView(aAnchor);
+
+          this._mainViewHeight = this._viewStack.clientHeight;
+
+          this._transitioning = true;
+          this._viewContainer.addEventListener("transitionend", function trans() {
+            this._viewContainer.removeEventListener("transitionend", trans);
+            this._transitioning = false;
+          }.bind(this));
+          this._viewContainer.style.height = this._subViews.scrollHeight + "px";
+
+          this._subViewObserver.observe(viewNode, {
+            attributes: true,
+            characterData: true,
+            childList: true,
+            subtree: true
+          });
+        ]]></body>
+      </method>
+
+      <method name="_shiftMainView">
+        <parameter name="aAnchor"/>
+        <body><![CDATA[
+          if (aAnchor) {
+            // We need to find the edge of the anchor, relative to the main panel.
+            // Then we need to add half the width of the anchor. This is the target
+            // that we need to transition to.
+            let anchorRect = aAnchor.getBoundingClientRect();
+            let mainViewRect = this._mainViewContainer.getBoundingClientRect();
+            let center = aAnchor.clientWidth / 2;
+            let direction = aAnchor.ownerDocument.defaultView.getComputedStyle(aAnchor, null).direction;
+            let edge, target;
+            if (direction == "ltr") {
+              edge = anchorRect.left - mainViewRect.left;
+              target = "-" + (edge + center);
+            } else {
+              edge = mainViewRect.right - anchorRect.right;
+              target = edge + center;
+            }
+            this._mainViewContainer.style.transform = "translateX(" + target + "px)";
+            aAnchor.classList.add("panel-multiview-anchor");
+          } else {
+            this._mainViewContainer.style.transform = "";
+            if (this.anchorElement)
+              this.anchorElement.classList.remove("panel-multiview-anchor");
+          }
+          this.anchorElement = aAnchor;
+        ]]></body>
+      </method>
+
+      <method name="handleEvent">
+        <parameter name="aEvent"/>
+        <body><![CDATA[
+          switch(aEvent.type) {
+            case "click":
+              if (aEvent.originalTarget == this._clickCapturer) {
+                this.showMainView();
+              }
+              break;
+            case "overflow":
+              // Resize the right view on the next tick.
+              if (this.showingSubView) {
+                setTimeout(this._syncContainerWithSubView.bind(this), 0);
+              } else if (!this.transitioning) {
+                setTimeout(this._syncContainerWithMainView.bind(this), 0);
+              }
+              break;
+            case "popupshowing":
+              this.setAttribute("panelopen", "true");
+              this._syncContainerWithMainView();
+              break;
+            case "popupshown":
+              this._setMaxHeight();
+              break;
+            case "popuphidden":
+              this.removeAttribute("panelopen");
+              this._mainView.style.height = "";
+              this.showMainView();
+              break;
+          }
+        ]]></body>
+      </method>
+
+      <method name="_setMaxHeight">
+        <body><![CDATA[
+          // Ignore the mutation that'll fire when we set the height of
+          // the main view.
+          this.ignoreMutations = true;
+          this._mainView.style.height =
+            this.getBoundingClientRect().height + "px";
+          this.ignoreMutations = false;
+        ]]></body>
+      </method>
+      <method name="_syncContainerWithSubView">
+        <body><![CDATA[
+          if (!this.ignoreMutations && this.showingSubView) {
+            this._viewContainer.style.height =
+              this._subViews.scrollHeight + "px";
+          }
+        ]]></body>
+      </method>
+      <method name="_syncContainerWithMainView">
+        <body><![CDATA[
+          if (!this.ignoreMutations && !this.showingSubView && !this._transitioning) {
+            this._viewContainer.style.height =
+              this._mainView.scrollHeight + "px";
+          }
+        ]]></body>
+      </method>
+
+    </implementation>
+  </binding>
+
+  <binding id="panelview">
+    <implementation>
+      <property name="panelMultiView" readonly="true">
+        <getter><![CDATA[
+          if (this.parentNode.localName != "panelmultiview") {
+            return document.getBindingParent(this.parentNode);
+          }
+
+          return this.parentNode;
+        ]]></getter>
+      </property>
+    </implementation>
+  </binding>
+</bindings>

browser/components/customizableui/content/toolbar.xml

@@ -0,0 +1,556 @@
+<?xml version="1.0"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<bindings id="browserToolbarBindings"
+          xmlns="http://www.mozilla.org/xbl"
+          xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
+          xmlns:xbl="http://www.mozilla.org/xbl">
+
+  <binding id="toolbar">
+    <resources>
+      <stylesheet src="chrome://global/skin/toolbar.css"/>
+    </resources>
+    <implementation implements="nsIAccessibleProvider">
+      <field name="overflowedDuringConstruction">null</field>
+
+      <property name="accessibleType" readonly="true">
+        <getter>
+          return Components.interfaces.nsIAccessibleProvider.XULToolbar;
+        </getter>
+      </property>
+
+      <constructor><![CDATA[
+          let scope = {};
+          Cu.import("resource:///modules/CustomizableUI.jsm", scope);
+          // Add an early overflow event listener that will mark if the
+          // toolbar overflowed during construction.
+          if (scope.CustomizableUI.isAreaOverflowable(this.id)) {
+            this.addEventListener("overflow", this);
+            this.addEventListener("underflow", this);
+          }
+
+          if (document.readyState == "complete") {
+            this._init();
+          } else {
+            // Need to wait until XUL overlays are loaded. See bug 554279.
+            let self = this;
+            document.addEventListener("readystatechange", function onReadyStateChange() {
+              if (document.readyState != "complete")
+                return;
+              document.removeEventListener("readystatechange", onReadyStateChange, false);
+              self._init();
+            }, false);
+          }
+      ]]></constructor>
+
+      <method name="_init">
+        <body><![CDATA[
+          let scope = {};
+          Cu.import("resource:///modules/CustomizableUI.jsm", scope);
+          let CustomizableUI = scope.CustomizableUI;
+
+          // Searching for the toolbox palette in the toolbar binding because
+          // toolbars are constructed first.
+          let toolbox = this.toolbox;
+          if (toolbox && !toolbox.palette) {
+            for (let node of toolbox.children) {
+              if (node.localName == "toolbarpalette") {
+                // Hold on to the palette but remove it from the document.
+                toolbox.palette = node;
+                toolbox.removeChild(node);
+                break;
+              }
+            }
+          }
+
+          // pass the current set of children for comparison with placements:
+          let children = [node.id for (node of this.childNodes)
+                          if (node.getAttribute("skipintoolbarset") != "true" && node.id)];
+          CustomizableUI.registerToolbarNode(this, children);
+        ]]></body>
+      </method>
+
+      <method name="handleEvent">
+        <parameter name="aEvent"/>
+        <body><![CDATA[
+          if (aEvent.type == "overflow" && aEvent.detail > 0) {
+            if (this.overflowable && this.overflowable.initialized) {
+              this.overflowable.onOverflow(aEvent);
+            } else {
+              this.overflowedDuringConstruction = aEvent;
+            }
+          } else if (aEvent.type == "underflow" && aEvent.detail > 0) {
+            this.overflowedDuringConstruction = null;
+          }
+        ]]></body>
+      </method>
+
+      <method name="insertItem">
+        <parameter name="aId"/>
+        <parameter name="aBeforeElt"/>
+        <parameter name="aWrapper"/>
+        <body><![CDATA[
+          if (aWrapper) {
+            Cu.reportError("Can't insert " + aId + ": using insertItem " +
+                           "no longer supports wrapper elements.");
+            return null;
+          }
+
+          // Hack, the customizable UI code makes this be the last position
+          let pos = null;
+          if (aBeforeElt) {
+            let beforeInfo = CustomizableUI.getPlacementOfWidget(aBeforeElt.id);
+            if (beforeInfo.area != this.id) {
+              Cu.reportError("Can't insert " + aId + " before " +
+                             aBeforeElt.id + " which isn't in this area (" +
+                             this.id + ").");
+              return null;
+            }
+            pos = beforeInfo.position;
+          }
+
+          CustomizableUI.addWidgetToArea(aId, this.id, pos);
+          return this.ownerDocument.getElementById(aId);
+        ]]></body>
+      </method>
+
+      <property name="toolbarName"
+                onget="return this.getAttribute('toolbarname');"
+                onset="this.setAttribute('toolbarname', val); return val;"/>
+
+      <property name="customizationTarget" readonly="true">
+        <getter><![CDATA[
+          if (this._customizationTarget)
+            return this._customizationTarget;
+
+          let id = this.getAttribute("customizationtarget");
+          if (id)
+            this._customizationTarget = document.getElementById(id);
+
+          if (this._customizationTarget)
+            this._customizationTarget.insertItem = this.insertItem.bind(this);
+          else
+            this._customizationTarget = this;
+
+          return this._customizationTarget;
+        ]]></getter>
+      </property>
+
+      <property name="toolbox" readonly="true">
+        <getter><![CDATA[
+          if (this._toolbox)
+            return this._toolbox;
+
+          let toolboxId = this.getAttribute("toolboxid");
+          if (toolboxId) {
+            let toolbox = document.getElementById(toolboxId);
+            if (toolbox) {
+              if (toolbox.externalToolbars.indexOf(this) == -1)
+                toolbox.externalToolbars.push(this);
+
+              this._toolbox = toolbox;
+            }
+          }
+
+          if (!this._toolbox && this.parentNode &&
+              this.parentNode.localName == "toolbox") {
+            this._toolbox = this.parentNode;
+          }
+
+          return this._toolbox;
+        ]]></getter>
+      </property>
+
+      <property name="currentSet">
+        <getter><![CDATA[
+          let currentWidgets = new Set();
+          for (let node of this.customizationTarget.children) {
+            let realNode = node.localName == "toolbarpaletteitem" ? node.firstChild : node;
+            if (realNode.getAttribute("skipintoolbarset") != "true") {
+              currentWidgets.add(realNode.id);
+            }
+          }
+          if (this.getAttribute("overflowing") == "true") {
+            let overflowTarget = this.getAttribute("overflowtarget");
+            let overflowList = this.ownerDocument.getElementById(overflowTarget);
+            for (let node of overflowList.children) {
+              let realNode = node.localName == "toolbarpaletteitem" ? node.firstChild : node;
+              if (realNode.getAttribute("skipintoolbarset") != "true") {
+                currentWidgets.add(realNode.id);
+              }
+            }
+          }
+          let orderedPlacements = CustomizableUI.getWidgetIdsInArea(this.id);
+          return orderedPlacements.filter((x) => currentWidgets.has(x)).join(',');
+        ]]></getter>
+        <setter><![CDATA[
+          // Get list of new and old ids:
+          let newVal = (val || '').split(',').filter(x => x);
+          let oldIds = CustomizableUI.getWidgetIdsInArea(this.id);
+
+          // Get a list of items only in the new list
+          let newIds = [id for (id of newVal) if (oldIds.indexOf(id) == -1)];
+          CustomizableUI.beginBatchUpdate();
+          for (let newId of newIds) {
+            oldIds = CustomizableUI.getWidgetIdsInArea(this.id);
+            let nextId = newId;
+            let pos;
+            do {
+              // Get the next item
+              nextId = newVal[newVal.indexOf(nextId) + 1];
+              // Figure out where it is in the old list
+              pos = oldIds.indexOf(nextId);
+              // If it's not in the old list, repeat:
+            } while (pos == -1 && nextId);
+            if (pos == -1) {
+              pos = null; // We didn't find anything, insert at the end
+            }
+            CustomizableUI.addWidgetToArea(newId, this.id, pos);
+          }
+
+          let currentIds = this.currentSet.split(',');
+          let removedIds = [id for (id of currentIds) if (newIds.indexOf(id) == -1 && newVal.indexOf(id) == -1)];
+          for (let removedId of removedIds) {
+            CustomizableUI.removeWidgetFromArea(removedId);
+          }
+          CustomizableUI.endBatchUpdate();
+        ]]></setter>
+      </property>
+
+
+    </implementation>
+  </binding>
+
+  <binding id="toolbar-menubar-stub">
+    <implementation>
+      <property name="toolbox" readonly="true">
+        <getter><![CDATA[
+          if (this._toolbox)
+            return this._toolbox;
+
+          if (this.parentNode && this.parentNode.localName == "toolbox") {
+            this._toolbox = this.parentNode;
+          }
+
+          return this._toolbox;
+        ]]></getter>
+      </property>
+      <property name="currentSet" readonly="true">
+        <getter><![CDATA[
+          return this.getAttribute("defaultset");
+        ]]></getter>
+      </property>
+      <method name="insertItem">
+        <body><![CDATA[
+          return null;
+        ]]></body>
+      </method>
+    </implementation>
+  </binding>
+
+  <!-- The toolbar-menubar-autohide and toolbar-drag bindings are almost
+       verbatim copies of their toolkit counterparts - they just inherit from
+       the customizableui's toolbar binding instead of toolkit's. We're currently
+       OK with the maintainance burden of having two copies of a binding, since
+       the long term goal is to move the customization framework into toolkit. -->
+
+  <binding id="toolbar-menubar-autohide"
+           extends="chrome://browser/content/customizableui/toolbar.xml#toolbar">
+    <implementation>
+      <constructor>
+        this._setInactive();
+      </constructor>
+      <destructor>
+        this._setActive();
+      </destructor>
+
+      <field name="_inactiveTimeout">null</field>
+
+      <field name="_contextMenuListener"><![CDATA[({
+        toolbar: this,
+        contextMenu: null,
+
+        get active () !!this.contextMenu,
+
+        init: function (event) {
+          let node = event.target;
+          while (node != this.toolbar) {
+            if (node.localName == "menupopup")
+              return;
+            node = node.parentNode;
+          }
+
+          let contextMenuId = this.toolbar.getAttribute("context");
+          if (!contextMenuId)
+            return;
+
+          this.contextMenu = document.getElementById(contextMenuId);
+          if (!this.contextMenu)
+            return;
+
+          this.contextMenu.addEventListener("popupshown", this, false);
+          this.contextMenu.addEventListener("popuphiding", this, false);
+          this.toolbar.addEventListener("mousemove", this, false);
+        },
+        handleEvent: function (event) {
+          switch (event.type) {
+            case "popupshown":
+              this.toolbar.removeEventListener("mousemove", this, false);
+              break;
+            case "popuphiding":
+            case "mousemove":
+              this.toolbar._setInactiveAsync();
+              this.toolbar.removeEventListener("mousemove", this, false);
+              this.contextMenu.removeEventListener("popuphiding", this, false);
+              this.contextMenu.removeEventListener("popupshown", this, false);
+              this.contextMenu = null;
+              break;
+          }
+        }
+      })]]></field>
+
+      <method name="_setInactive">
+        <body><![CDATA[
+          this.setAttribute("inactive", "true");
+        ]]></body>
+      </method>
+
+      <method name="_setInactiveAsync">
+        <body><![CDATA[
+          this._inactiveTimeout = setTimeout(function (self) {
+            if (self.getAttribute("autohide") == "true") {
+              self._inactiveTimeout = null;
+              self._setInactive();
+            }
+          }, 0, this);
+        ]]></body>
+      </method>
+
+      <method name="_setActive">
+        <body><![CDATA[
+          if (this._inactiveTimeout) {
+            clearTimeout(this._inactiveTimeout);
+            this._inactiveTimeout = null;
+          }
+          this.removeAttribute("inactive");
+        ]]></body>
+      </method>
+    </implementation>
+
+    <handlers>
+      <handler event="DOMMenuBarActive"     action="this._setActive();"/>
+      <handler event="popupshowing"         action="this._setActive();"/>
+      <handler event="mousedown" button="2" action="this._contextMenuListener.init(event);"/>
+      <handler event="DOMMenuBarInactive"><![CDATA[
+        if (!this._contextMenuListener.active)
+          this._setInactiveAsync();
+      ]]></handler>
+    </handlers>
+  </binding>
+
+  <binding id="toolbar-drag"
+           extends="chrome://browser/content/customizableui/toolbar.xml#toolbar">
+    <implementation>
+      <field name="_dragBindingAlive">true</field>
+      <constructor><![CDATA[
+        if (!this._draggableStarted) {
+          this._draggableStarted = true;
+          try {
+            let tmp = {};
+            Components.utils.import("resource://gre/modules/WindowDraggingUtils.jsm", tmp);
+            let draggableThis = new tmp.WindowDraggingElement(this);
+            draggableThis.mouseDownCheck = function(e) {
+              return this._dragBindingAlive;
+            };
+          } catch (e) {}
+        }
+      ]]></constructor>
+    </implementation>
+  </binding>
+
+
+<!-- This is a peculiar binding. It is here to deal with overlayed/inserted add-on content,
+      and immediately direct such content elsewhere. -->
+  <binding id="addonbar-delegating">
+    <implementation>
+      <constructor><![CDATA[
+          // Reading these immediately so nobody messes with them anymore:
+          this._delegatingToolbar = this.getAttribute("toolbar-delegate");
+          // Leaving those in here to unbreak some code:
+          if (document.readyState == "complete") {
+            this._init();
+          } else {
+            // Need to wait until XUL overlays are loaded. See bug 554279.
+            let self = this;
+            document.addEventListener("readystatechange", function onReadyStateChange() {
+              if (document.readyState != "complete")
+                return;
+              document.removeEventListener("readystatechange", onReadyStateChange, false);
+              self._init();
+            }, false);
+          }
+      ]]></constructor>
+
+      <method name="_init">
+        <body><![CDATA[
+          // Searching for the toolbox palette in the toolbar binding because
+          // toolbars are constructed first.
+          let toolbox = this.toolbox;
+          if (toolbox && !toolbox.palette) {
+            for (let node of toolbox.children) {
+              if (node.localName == "toolbarpalette") {
+                // Hold on to the palette but remove it from the document.
+                toolbox.palette = node;
+                toolbox.removeChild(node);
+              }
+            }
+          }
+
+          // pass the current set of children for comparison with placements:
+          let children = [node.id for (node of this.childNodes)
+                          if (node.getAttribute("skipintoolbarset") != "true" && node.id)];
+          CustomizableUI.registerToolbarNode(this, children);
+          this.evictNodes();
+          // We can't easily use |this| or strong bindings for the observer fn here
+          // because that creates leaky circular references when the node goes away,
+          // and XBL destructors are unreliable.
+          let mutationObserver = new MutationObserver(function(mutations) {
+            if (!mutations.length) {
+              return;
+            }
+            let toolbar = mutations[0].target;
+            // Can't use our own attribute because we might not have one if we're set to
+            // collapsed
+            let areCustomizing = toolbar.ownerDocument.documentElement.getAttribute("customizing");
+            if (!toolbar._isModifying && !areCustomizing) {
+              toolbar.evictNodes();
+            }
+          });
+          mutationObserver.observe(this, {childList: true});
+        ]]></body>
+      </method>
+      <method name="evictNodes">
+        <body><![CDATA[
+          this._isModifying = true;
+          let i = this.childNodes.length;
+          while (i--) {
+            let node = this.childNodes[i];
+            if (this.childNodes[i].id) {
+              this.evictNode(this.childNodes[i]);
+            } else {
+              node.remove();
+            }
+          }
+          this._isModifying = false;
+        ]]></body>
+      </method>
+      <method name="evictNode">
+        <parameter name="aNode"/>
+        <body>
+        <![CDATA[
+          if (this._whiteListed.has(aNode.id) || CustomizableUI.isSpecialWidget(aNode.id)) {
+            return;
+          }
+          const kItemMaxWidth = 100;
+          let oldParent = aNode.parentNode;
+
+          try {
+            aNode.setAttribute("removable", "true");
+
+            let nodeWidth = aNode.getBoundingClientRect().width;
+            if (nodeWidth == 0 || nodeWidth > kItemMaxWidth) {
+              throw new Error(aNode.id + " is too big (" + nodeWidth +
+                              "px wide), moving to the palette");
+            }
+            CustomizableUI.addWidgetToArea(aNode.id, this._delegatingToolbar);
+          } catch (ex) {
+            Cu.reportError(ex);
+            // This will throw if the node is too big, or can't be moved there for
+            // some reason. Try to remove it anyway:
+            try {
+              CustomizableUI.removeWidgetFromArea(aNode.id);
+            } catch (ex) {
+              Cu.reportError(ex);
+              aNode.remove();
+            }
+          }
+
+          // Surprise: addWidgetToArea(palette) will get you nothing if the palette
+          // is not constructed yet. Fix:
+          if (aNode.parentNode == oldParent) {
+            let palette = this.toolbox.palette;
+            if (palette && oldParent != palette) {
+              palette.appendChild(aNode);
+            }
+          }
+        ]]></body>
+      </method>
+      <method name="insertItem">
+        <parameter name="aId"/>
+        <parameter name="aBeforeElt"/>
+        <parameter name="aWrapper"/>
+        <body><![CDATA[
+          if (aWrapper) {
+            Cu.reportError("Can't insert " + aId + ": using insertItem " +
+                           "no longer supports wrapper elements.");
+            return null;
+          }
+
+          let widget = CustomizableUI.getWidget(aId);
+          widget = widget && widget.forWindow(window);
+          let node = widget && widget.node;
+          if (!node) {
+            return null;
+          }
+
+          this._isModifying = true;
+          // Temporarily add it here so it can have a width, then ditch it:
+          this.appendChild(node);
+          this.evictNode(node);
+          this._isModifying = false;
+          // We will now have moved stuff around; kick off an aftercustomization event
+          // so add-ons know we've just moved their stuff:
+          if (window.gCustomizeMode) {
+            window.gCustomizeMode.dispatchToolboxEvent("aftercustomization");
+          }
+          return node;
+        ]]></body>
+      </method>
+      <property name="customizationTarget" readonly="true">
+        <getter><![CDATA[
+          return this;
+        ]]></getter>
+      </property>
+      <property name="currentSet">
+        <getter><![CDATA[
+          return [node.id for (node of this.children)].join(',');
+        ]]></getter>
+        <setter><![CDATA[
+          let v = val.split(',');
+          let newButtons = v.filter(x => x && (!this._whiteListed.has(x) &&
+                                               !CustomizableUI.isSpecialWidget(x) &&
+                                               !this._currentSetMigrated.has(x)));
+          for (x of newButtons) {
+            this._currentSetMigrated.add(x);
+            this.insertItem(x);
+          }
+        ]]></setter>
+      </property>
+      <property name="toolbox" readonly="true">
+        <getter><![CDATA[
+          if (!this._toolbox && this.parentNode &&
+              this.parentNode.localName == "toolbox") {
+            this._toolbox = this.parentNode;
+          }
+
+          return this._toolbox;
+        ]]></getter>
+      </property>
+      <field name="_whiteListed" readonly="true">new Set(["addonbar-closebutton", "status-bar"])</field>
+      <field name="_isModifying">false</field>
+      <field name="_currentSetMigrated">new Set()</field>
+    </implementation>
+  </binding>
+</bindings>

browser/components/customizableui/moz.build

@@ -0,0 +1,12 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+PARALLEL_DIRS += [
+		'content',
+		'src',
+]
+
+BROWSER_CHROME_MANIFESTS += ['test/browser.ini']

browser/components/customizableui/src/CustomizableWidgets.jsm

@@ -0,0 +1,779 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
+
+this.EXPORTED_SYMBOLS = ["CustomizableWidgets"];
+
+Cu.import("resource:///modules/CustomizableUI.jsm");
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
+  "resource://gre/modules/PlacesUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "RecentlyClosedTabsAndWindowsMenuUtils",
+  "resource:///modules/sessionstore/RecentlyClosedTabsAndWindowsMenuUtils.jsm");
+XPCOMUtils.defineLazyServiceGetter(this, "CharsetManager",
+                                   "@mozilla.org/charset-converter-manager;1",
+                                   "nsICharsetConverterManager");
+
+const kNSXUL = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
+const kPrefCustomizationDebug = "browser.uiCustomization.debug";
+const kWidePanelItemClass = "panel-wide-item";
+
+let gModuleName = "[CustomizableWidgets]";
+#include logging.js
+
+function setAttributes(aNode, aAttrs) {
+  for (let [name, value] of Iterator(aAttrs)) {
+    if (!value) {
+      if (aNode.hasAttribute(name))
+        aNode.removeAttribute(name);
+    } else {
+      if (name == "label" || name == "tooltiptext")
+        value = CustomizableUI.getLocalizedProperty({id: aAttrs.id}, name);
+      aNode.setAttribute(name, value);
+    }
+  }
+}
+
+const CustomizableWidgets = [{
+    id: "history-panelmenu",
+    type: "view",
+    viewId: "PanelUI-history",
+    shortcutId: "key_gotoHistory",
+    removable: true,
+    defaultArea: CustomizableUI.AREA_PANEL,
+    onViewShowing: function(aEvent) {
+      // Populate our list of history
+      const kMaxResults = 15;
+      let doc = aEvent.detail.ownerDocument;
+
+      let options = PlacesUtils.history.getNewQueryOptions();
+      options.excludeQueries = true;
+      options.includeHidden = false;
+      options.resultType = options.RESULTS_AS_URI;
+      options.queryType = options.QUERY_TYPE_HISTORY;
+      options.sortingMode = options.SORT_BY_DATE_DESCENDING;
+      options.maxResults = kMaxResults;
+      let query = PlacesUtils.history.getNewQuery();
+
+      let items = doc.getElementById("PanelUI-historyItems");
+      // Clear previous history items.
+      while (items.firstChild) {
+        items.removeChild(items.firstChild);
+      }
+
+      PlacesUtils.history.QueryInterface(Ci.nsPIPlacesDatabase)
+                         .asyncExecuteLegacyQueries([query], 1, options, {
+        handleResult: function (aResultSet) {
+          let onHistoryVisit = function (aUri, aEvent, aItem) {
+            doc.defaultView.openUILink(aUri, aEvent);
+            CustomizableUI.hidePanelForNode(aItem);
+          };
+          let fragment = doc.createDocumentFragment();
+          for (let row, i = 0; (row = aResultSet.getNextRow()); i++) {
+            try {
+              let uri = row.getResultByIndex(1);
+              let title = row.getResultByIndex(2);
+              let icon = row.getResultByIndex(6);
+
+              let item = doc.createElementNS(kNSXUL, "toolbarbutton");
+              item.setAttribute("label", title || uri);
+              item.setAttribute("tabindex", "0");
+              item.addEventListener("command", function (aEvent) {
+                onHistoryVisit(uri, aEvent, item);
+              });
+              item.addEventListener("click", function (aEvent) {
+                onHistoryVisit(uri, aEvent, item);
+              });
+              if (icon)
+                item.setAttribute("image", "moz-anno:favicon:" + icon);
+              fragment.appendChild(item);
+            } catch (e) {
+              ERROR("Error while showing history subview: " + e);
+            }
+          }
+          items.appendChild(fragment);
+        },
+        handleError: function (aError) {
+          LOG("History view tried to show but had an error: " + aError);
+        },
+        handleCompletion: function (aReason) {
+          LOG("History view is being shown!");
+        },
+      });
+
+      let recentlyClosedTabs = doc.getElementById("PanelUI-recentlyClosedTabs");
+      while (recentlyClosedTabs.firstChild) {
+        recentlyClosedTabs.removeChild(recentlyClosedTabs.firstChild);
+      }
+
+      let recentlyClosedWindows = doc.getElementById("PanelUI-recentlyClosedWindows");
+      while (recentlyClosedWindows.firstChild) {
+        recentlyClosedWindows.removeChild(recentlyClosedWindows.firstChild);
+      }
+
+      let tabsFragment = RecentlyClosedTabsAndWindowsMenuUtils.getTabsFragment(doc.defaultView, "toolbarbutton");
+      let separator = doc.getElementById("PanelUI-recentlyClosedTabs-separator");
+      separator.hidden = !tabsFragment.childElementCount;
+      recentlyClosedTabs.appendChild(tabsFragment);
+
+      let windowsFragment = RecentlyClosedTabsAndWindowsMenuUtils.getWindowsFragment(doc.defaultView, "toolbarbutton");
+      separator = doc.getElementById("PanelUI-recentlyClosedWindows-separator");
+      separator.hidden = !windowsFragment.childElementCount;
+      recentlyClosedWindows.appendChild(windowsFragment);
+    },
+    onViewHiding: function(aEvent) {
+      LOG("History view is being hidden!");
+    }
+  }, {
+    id: "privatebrowsing-button",
+    removable: true,
+    shortcutId: "key_privatebrowsing",
+    defaultArea: CustomizableUI.AREA_PANEL,
+    onCommand: function(e) {
+      if (e.target && e.target.ownerDocument && e.target.ownerDocument.defaultView) {
+        let win = e.target.ownerDocument.defaultView;
+        if (typeof win.OpenBrowserWindow == "function") {
+          win.OpenBrowserWindow({private: true});
+        }
+      }
+    }
+  }, {
+    id: "save-page-button",
+    removable: true,
+    shortcutId: "key_savePage",
+    defaultArea: CustomizableUI.AREA_PANEL,
+    onCommand: function(aEvent) {
+      let win = aEvent.target &&
+                aEvent.target.ownerDocument &&
+                aEvent.target.ownerDocument.defaultView;
+      if (win && typeof win.saveDocument == "function") {
+        win.saveDocument(win.content.document);
+      }
+    }
+  }, {
+    id: "find-button",
+    removable: true,
+    shortcutId: "key_find",
+    defaultArea: CustomizableUI.AREA_PANEL,
+    onCommand: function(aEvent) {
+      let win = aEvent.target &&
+                aEvent.target.ownerDocument &&
+                aEvent.target.ownerDocument.defaultView;
+      if (win && win.gFindBar) {
+        win.gFindBar.onFindCommand();
+      }
+    }
+  }, {
+    id: "open-file-button",
+    removable: true,
+    shortcutId: "openFileKb",
+    defaultArea: CustomizableUI.AREA_PANEL,
+    onCommand: function(aEvent) {
+      let win = aEvent.target
+                && aEvent.target.ownerDocument
+                && aEvent.target.ownerDocument.defaultView;
+      if (win && typeof win.BrowserOpenFileWindow == "function") {
+        win.BrowserOpenFileWindow();
+      }
+    }
+  }, {
+    id: "developer-button",
+    type: "view",
+    viewId: "PanelUI-developer",
+    removable: true,
+    shortcutId: "key_devToolboxMenuItem",
+    defaultArea: 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 items = doc.getElementById("PanelUI-developerItems");
+      let menu = doc.getElementById("menuWebDeveloperPopup");
+      let attrs = ["oncommand", "onclick", "label", "key", "disabled",
+                   "command"];
+
+      let fragment = doc.createDocumentFragment();
+      for (let node of menu.children) {
+        if (node.hidden)
+          continue;
+
+        let item;
+        if (node.localName == "menuseparator") {
+          item = doc.createElementNS(kNSXUL, "menuseparator");
+        } else if (node.localName == "menuitem") {
+          item = doc.createElementNS(kNSXUL, "toolbarbutton");
+        } else {
+          continue;
+        }
+        for (let attr of attrs) {
+          let attrVal = node.getAttribute(attr);
+          if (attrVal)
+            item.setAttribute(attr, attrVal);
+        }
+        item.setAttribute("tabindex", "0");
+        fragment.appendChild(item);
+      }
+      items.appendChild(fragment);
+
+      aEvent.target.addEventListener("command", win.PanelUI.onCommandHandler);
+    },
+    onViewHiding: function(aEvent) {
+      let doc = aEvent.target.ownerDocument;
+      let win = doc.defaultView;
+      let items = doc.getElementById("PanelUI-developerItems");
+      let parent = items.parentNode;
+      // We'll take the container out of the document before cleaning it out
+      // to avoid reflowing each time we remove something.
+      parent.removeChild(items);
+
+      while (items.firstChild) {
+        items.firstChild.remove();
+      }
+
+      parent.appendChild(items);
+      aEvent.target.removeEventListener("command",
+                                        win.PanelUI.onCommandHandler);
+    }
+  }, {
+    id: "add-ons-button",
+    removable: true,
+    shortcutId: "key_openAddons",
+    defaultArea: CustomizableUI.AREA_PANEL,
+    onCommand: function(aEvent) {
+      let win = aEvent.target &&
+                aEvent.target.ownerDocument &&
+                aEvent.target.ownerDocument.defaultView;
+      if (win && typeof win.BrowserOpenAddonsMgr == "function") {
+        win.BrowserOpenAddonsMgr();
+      }
+    }
+  }, {
+    id: "preferences-button",
+    removable: true,
+    defaultArea: CustomizableUI.AREA_PANEL,
+#ifdef XP_WIN
+    label: "preferences-button.labelWin",
+    tooltiptext: "preferences-button.tooltipWin",
+#endif
+    onCommand: function(aEvent) {
+      let win = aEvent.target &&
+                aEvent.target.ownerDocument &&
+                aEvent.target.ownerDocument.defaultView;
+      if (win && typeof win.openPreferences == "function") {
+        win.openPreferences();
+      }
+    }
+  }, {
+    id: "zoom-controls",
+    type: "custom",
+    removable: true,
+    defaultArea: CustomizableUI.AREA_PANEL,
+    onBuild: function(aDocument) {
+      const kPanelId = "PanelUI-popup";
+      let inPanel = (this.currentArea == CustomizableUI.AREA_PANEL);
+      let noautoclose = inPanel ? "true" : null;
+      let cls = inPanel ? "panel-combined-button" : "toolbarbutton-1";
+
+      if (!this.currentArea)
+        cls = null;
+
+      let buttons = [{
+        id: "zoom-out-button",
+        noautoclose: noautoclose,
+        command: "cmd_fullZoomReduce",
+        class: cls,
+        label: true,
+        tooltiptext: true
+      }, {
+        id: "zoom-reset-button",
+        noautoclose: noautoclose,
+        command: "cmd_fullZoomReset",
+        class: cls,
+        tooltiptext: true
+      }, {
+        id: "zoom-in-button",
+        noautoclose: noautoclose,
+        command: "cmd_fullZoomEnlarge",
+        class: cls,
+        label: true,
+        tooltiptext: true
+      }];
+
+      let node = aDocument.createElementNS(kNSXUL, "toolbaritem");
+      node.setAttribute("id", "zoom-controls");
+      node.setAttribute("title", CustomizableUI.getLocalizedProperty(this, "tooltiptext"));
+      // Set this as an attribute in addition to the property to make sure we can style correctly.
+      node.setAttribute("removable", "true");
+      node.classList.add("chromeclass-toolbar-additional");
+      node.classList.add("toolbaritem-combined-buttons");
+      node.classList.add(kWidePanelItemClass);
+
+      buttons.forEach(function(aButton) {
+        let btnNode = aDocument.createElementNS(kNSXUL, "toolbarbutton");
+        setAttributes(btnNode, aButton);
+        if (inPanel)
+          btnNode.setAttribute("tabindex", "0");
+        node.appendChild(btnNode);
+      });
+
+      // The middle node is the 'Reset Zoom' button.
+      let zoomResetButton = node.childNodes[1];
+      let window = aDocument.defaultView;
+      function updateZoomResetButton() {
+        //XXXgijs in some tests we get called very early, and there's no docShell on the
+        // tabbrowser. This breaks the zoom toolkit code (see bug 897410). Don't let that happen:
+        let zoomFactor = 100;
+        if (window.gBrowser.docShell) {
+          zoomFactor = Math.floor(window.ZoomManager.zoom * 100);
+        }
+        zoomResetButton.setAttribute("label", CustomizableUI.getLocalizedProperty(
+          buttons[1], "label", [zoomFactor]
+        ));
+      };
+
+      // Register ourselves with the service so we know when the zoom prefs change.
+      Services.obs.addObserver(updateZoomResetButton, "browser-fullZoom:zoomChange", false);
+      Services.obs.addObserver(updateZoomResetButton, "browser-fullZoom:zoomReset", false);
+
+      if (inPanel && this.currentArea) {
+        let panel = aDocument.getElementById(kPanelId);
+        panel.addEventListener("popupshowing", updateZoomResetButton);
+      } else {
+        updateZoomResetButton();
+      }
+
+      function updateWidgetStyle(aArea) {
+        let inPanel = (aArea == CustomizableUI.AREA_PANEL);
+        let attrs = {
+          noautoclose: inPanel ? "true" : null,
+          class: inPanel ? "panel-combined-button" : aArea ? "toolbarbutton-1" : null
+        };
+        for (let i = 0, l = node.childNodes.length; i < l; ++i) {
+          setAttributes(node.childNodes[i], attrs);
+        }
+
+        updateZoomResetButton();
+      }
+
+      let listener = {
+        onWidgetAdded: function(aWidgetId, aArea, aPosition) {
+          if (aWidgetId != this.id)
+            return;
+
+          updateWidgetStyle(aArea);
+          if (aArea == CustomizableUI.AREA_PANEL) {
+            let panel = aDocument.getElementById(kPanelId);
+            panel.addEventListener("popupshowing", updateZoomResetButton);
+          }
+        }.bind(this),
+
+        onWidgetRemoved: function(aWidgetId, aPrevArea) {
+          if (aWidgetId != this.id)
+            return;
+
+          if (aPrevArea == CustomizableUI.AREA_PANEL) {
+            let panel = aDocument.getElementById(kPanelId);
+            panel.removeEventListener("popupshowing", updateZoomResetButton);
+          }
+
+          // When a widget is demoted to the palette ('removed'), it's visual
+          // style should change.
+          updateWidgetStyle();
+        }.bind(this),
+
+        onWidgetReset: function(aWidgetId) {
+          if (aWidgetId != this.id)
+            return;
+          updateWidgetStyle(this.currentArea);
+        }.bind(this),
+
+        onWidgetMoved: function(aWidgetId, aArea) {
+          if (aWidgetId != this.id)
+            return;
+          updateWidgetStyle(aArea);
+        }.bind(this),
+
+        onWidgetInstanceRemoved: function(aWidgetId, aDoc) {
+          if (aWidgetId != this.id || aDoc != aDocument)
+            return;
+
+          CustomizableUI.removeListener(listener);
+          Services.obs.removeObserver(updateZoomResetButton, "browser-fullZoom:zoomChange");
+          Services.obs.removeObserver(updateZoomResetButton, "browser-fullZoom:zoomReset");
+          let panel = aDoc.getElementById(kPanelId);
+          panel.removeEventListener("popupshowing", updateZoomResetButton);
+        }.bind(this),
+
+        onWidgetDrag: function(aWidgetId, aArea) {
+          if (aWidgetId != this.id)
+            return;
+          aArea = aArea || this.currentArea;
+          updateWidgetStyle(aArea);
+        }.bind(this)
+      };
+      CustomizableUI.addListener(listener);
+
+      return node;
+    }
+  }, {
+    id: "edit-controls",
+    type: "custom",
+    removable: true,
+    defaultArea: CustomizableUI.AREA_PANEL,
+    onBuild: function(aDocument) {
+      let inPanel = (this.currentArea == CustomizableUI.AREA_PANEL);
+      let cls = inPanel ? "panel-combined-button" : "toolbarbutton-1";
+
+      if (!this.currentArea)
+        cls = null;
+
+      let buttons = [{
+        id: "cut-button",
+        command: "cmd_cut",
+        class: cls,
+        label: true,
+        tooltiptext: true
+      }, {
+        id: "copy-button",
+        command: "cmd_copy",
+        class: cls,
+        label: true,
+        tooltiptext: true
+      }, {
+        id: "paste-button",
+        command: "cmd_paste",
+        class: cls,
+        label: true,
+        tooltiptext: true
+      }];
+
+      let node = aDocument.createElementNS(kNSXUL, "toolbaritem");
+      node.setAttribute("id", "edit-controls");
+      node.setAttribute("title", CustomizableUI.getLocalizedProperty(this, "tooltiptext"));
+      // Set this as an attribute in addition to the property to make sure we can style correctly.
+      node.setAttribute("removable", "true");
+      node.classList.add("chromeclass-toolbar-additional");
+      node.classList.add("toolbaritem-combined-buttons");
+      node.classList.add(kWidePanelItemClass);
+
+      buttons.forEach(function(aButton) {
+        let btnNode = aDocument.createElementNS(kNSXUL, "toolbarbutton");
+        setAttributes(btnNode, aButton);
+        if (inPanel)
+          btnNode.setAttribute("tabindex", "0");
+        node.appendChild(btnNode);
+      });
+
+      function updateWidgetStyle(aArea) {
+        let inPanel = (aArea == CustomizableUI.AREA_PANEL);
+        let cls = inPanel ? "panel-combined-button" : "toolbarbutton-1";
+        if (!aArea)
+          cls = null;
+        let attrs = {class: cls};
+        for (let i = 0, l = node.childNodes.length; i < l; ++i) {
+          setAttributes(node.childNodes[i], attrs);
+        }
+      }
+
+      let listener = {
+        onWidgetAdded: function(aWidgetId, aArea, aPosition) {
+          if (aWidgetId != this.id)
+            return;
+          updateWidgetStyle(aArea);
+        }.bind(this),
+
+        onWidgetRemoved: function(aWidgetId, aPrevArea) {
+          if (aWidgetId != this.id)
+            return;
+          // When a widget is demoted to the palette ('removed'), it's visual
+          // style should change.
+          updateWidgetStyle();
+        }.bind(this),
+
+        onWidgetReset: function(aWidgetId) {
+          if (aWidgetId != this.id)
+            return;
+          updateWidgetStyle(this.currentArea);
+        }.bind(this),
+
+        onWidgetMoved: function(aWidgetId, aArea) {
+          if (aWidgetId != this.id)
+            return;
+          updateWidgetStyle(aArea);
+        }.bind(this),
+
+        onWidgetInstanceRemoved: function(aWidgetId, aDoc) {
+          if (aWidgetId != this.id || aDoc != aDocument)
+            return;
+          CustomizableUI.removeListener(listener);
+        }.bind(this),
+
+        onWidgetDrag: function(aWidgetId, aArea) {
+          if (aWidgetId != this.id)
+            return;
+          aArea = aArea || this.currentArea;
+          updateWidgetStyle(aArea);
+        }.bind(this)
+      };
+      CustomizableUI.addListener(listener);
+
+      return node;
+    }
+  },
+  {
+    id: "feed-button",
+    type: "view",
+    viewId: "PanelUI-feeds",
+    removable: true,
+    defaultArea: CustomizableUI.AREA_PANEL,
+    onClick: function(aEvent) {
+      let win = aEvent.target.ownerDocument.defaultView;
+      let feeds = win.gBrowser.selectedBrowser.feeds;
+
+      // Here, we only care about the case where we have exactly 1 feed and the
+      // user clicked...
+      let isClick = (aEvent.button == 0 || aEvent.button == 1);
+      if (feeds && feeds.length == 1 && isClick) {
+        aEvent.preventDefault();
+        aEvent.stopPropagation();
+        win.FeedHandler.subscribeToFeed(feeds[0].href, aEvent);
+        CustomizableUI.hidePanelForNode(aEvent.target);
+      }
+    },
+    onViewShowing: function(aEvent) {
+      let doc = aEvent.detail.ownerDocument;
+      let container = doc.getElementById("PanelUI-feeds");
+      let gotView = doc.defaultView.FeedHandler.buildFeedList(container, true);
+
+      // For no feeds or only a single one, don't show the panel.
+      if (!gotView) {
+        aEvent.preventDefault();
+        aEvent.stopPropagation();
+        return;
+      }
+    },
+    onCreated: function(node) {
+      let win = node.ownerDocument.defaultView;
+      let selectedBrowser = win.gBrowser.selectedBrowser;
+      let feeds = selectedBrowser && selectedBrowser.feeds;
+      if (!feeds || !feeds.length) {
+        node.setAttribute("disabled", "true");
+      }
+    }
+  }, {
+    id: "characterencoding-button",
+    type: "view",
+    viewId: "PanelUI-characterEncodingView",
+    removable: true,
+    defaultArea: CustomizableUI.AREA_PANEL,
+    maybeDisableMenu: function(aDocument) {
+      let window = aDocument.defaultView;
+      return !(window.gBrowser &&
+               window.gBrowser.docShell &&
+               window.gBrowser.docShell.mayEnableCharacterEncodingMenu);
+    },
+    getCharsetList: function(aSection, aDocument) {
+      let currCharset = aDocument.defaultView.content.document.characterSet;
+
+      let list = "";
+      try {
+        let pref = "intl.charsetmenu.browser." + aSection;
+        list = Services.prefs.getComplexValue(pref,
+                                              Ci.nsIPrefLocalizedString).data;
+      } catch (e) {}
+
+      list = list.trim();
+      if (!list)
+        return [];
+
+      list = list.split(",");
+
+      let items = [];
+      for (let charset of list) {
+        charset = charset.trim();
+
+        let notForBrowser = false;
+        try {
+          notForBrowser = CharsetManager.getCharsetData(charset,
+                                                        "notForBrowser");
+        } catch (e) {}
+
+        if (notForBrowser)
+          continue;
+
+        let title = charset;
+        try {
+          title = CharsetManager.getCharsetTitle(charset);
+        } catch (e) {}
+
+        items.push({value: charset, name: title, current: charset == currCharset});
+      }
+
+      return items;
+    },
+    getAutoDetectors: function(aDocument) {
+      let detectorEnum = CharsetManager.GetCharsetDetectorList();
+      let currDetector;
+      try {
+        currDetector = Services.prefs.getComplexValue(
+          "intl.charset.detector", Ci.nsIPrefLocalizedString).data;
+      } catch (e) {}
+      if (!currDetector)
+        currDetector = "off";
+      currDetector = "chardet." + currDetector;
+
+      let items = [];
+
+      while (detectorEnum.hasMore()) {
+        let detector = detectorEnum.getNext();
+
+        let title = detector;
+        try {
+          title = CharsetManager.getCharsetTitle(detector);
+        } catch (e) {}
+
+        items.push({value: detector, name: title, current: detector == currDetector});
+      }
+
+      items.sort((aItem1, aItem2) => {
+        return aItem1.name.localeCompare(aItem2.name);
+      });
+
+      return items;
+    },
+    populateList: function(aDocument, aContainerId, aSection) {
+      let containerElem = aDocument.getElementById(aContainerId);
+
+      while (containerElem.firstChild) {
+        containerElem.removeChild(containerElem.firstChild);
+      }
+
+      containerElem.addEventListener("command", this.onCommand, false);
+
+      let list = [];
+      if (aSection == "autodetect") {
+        list = this.getAutoDetectors(aDocument);
+      } else if (aSection == "browser") {
+        let staticList = this.getCharsetList("static", aDocument);
+        let cacheList = this.getCharsetList("cache", aDocument);
+        // Combine lists, and de-duplicate.
+        let checkedIn = new Set();
+        for (let item of staticList.concat(cacheList)) {
+          let itemName = item.name.toLowerCase();
+          if (!checkedIn.has(itemName)) {
+            list.push(item);
+            checkedIn.add(itemName);
+          }
+        }
+      }
+
+      // Update the appearance of the buttons when it's not possible to
+      // customize encoding.
+      let disabled = this.maybeDisableMenu(aDocument);
+      for (let item of list) {
+        let elem = aDocument.createElementNS(kNSXUL, "toolbarbutton");
+        elem.setAttribute("label", item.name);
+        elem.section = aSection;
+        elem.value = item.value;
+        if (item.current)
+          elem.setAttribute("current", "true");
+        if (disabled)
+          elem.setAttribute("disabled", "true");
+        containerElem.appendChild(elem);
+      }
+    },
+    onViewShowing: function(aEvent) {
+      let document = aEvent.target.ownerDocument;
+
+      this.populateList(document,
+                        "PanelUI-characterEncodingView-customlist",
+                        "browser");
+      this.populateList(document,
+                        "PanelUI-characterEncodingView-autodetect",
+                        "autodetect");
+    },
+    onCommand: function(aEvent) {
+      let node = aEvent.target;
+      if (!node.hasAttribute || !node.section) {
+        return;
+      }
+
+      CustomizableUI.hidePanelForNode(node);
+      let window = node.ownerDocument.defaultView;
+      let section = node.section;
+      let value = node.value;
+
+      // The behavior as implemented here is directly based off of the
+      // `MultiplexHandler()` method in browser.js.
+      if (section == "browser") {
+        window.BrowserSetForcedCharacterSet(value);
+      } else if (section == "autodetect") {
+        value = value.replace(/^chardet\./, "");
+        if (value == "off") {
+          value = "";
+        }
+        // Set the detector pref.
+        try {
+          let str = Cc["@mozilla.org/supports-string;1"]
+                      .createInstance(Ci.nsISupportsString);
+          str.data = value;
+          Services.prefs.setComplexValue("intl.charset.detector", Ci.nsISupportsString, str);
+        } catch (e) {
+          Cu.reportError("Failed to set the intl.charset.detector preference.");
+        }
+        // Prepare a browser page reload with a changed charset.
+        window.BrowserCharsetReload();
+      }
+    },
+    onCreated: function(aNode) {
+      const kPanelId = "PanelUI-popup";
+      let document = aNode.ownerDocument;
+
+      let updateButton = () => {
+        if (this.maybeDisableMenu(document))
+          aNode.setAttribute("disabled", "true");
+        else
+          aNode.removeAttribute("disabled");
+      };
+
+      if (this.currentArea == CustomizableUI.AREA_PANEL) {
+        let panel = document.getElementById(kPanelId);
+        panel.addEventListener("popupshowing", updateButton);
+      }
+
+      let listener = {
+        onWidgetAdded: (aWidgetId, aArea) => {
+          if (aWidgetId != this.id)
+            return;
+          if (aArea == CustomizableUI.AREA_PANEL) {
+            let panel = document.getElementById(kPanelId);
+            panel.addEventListener("popupshowing", updateButton);
+          }
+        },
+        onWidgetRemoved: (aWidgetId, aPrevArea) => {
+          if (aWidgetId != this.id)
+            return;
+          if (aPrevArea == CustomizableUI.AREA_PANEL) {
+            let panel = document.getElementById(kPanelId);
+            panel.removeEventListener("popupshowing", updateButton);
+          }
+        },
+        onWidgetInstanceRemoved: (aWidgetId, aDoc) => {
+          if (aWidgetId != this.id || aDoc != document)
+            return;
+
+          CustomizableUI.removeListener(listener);
+          let panel = aDoc.getElementById(kPanelId);
+          panel.removeEventListener("popupshowing", updateButton);
+        }
+      };
+      CustomizableUI.addListener(listener);
+    }
+  }];

browser/components/customizableui/src/PanelWideWidgetTracker.jsm

@@ -0,0 +1,152 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
+
+this.EXPORTED_SYMBOLS = ["PanelWideWidgetTracker"];
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "CustomizableUI",
+  "resource:///modules/CustomizableUI.jsm");
+
+let gModuleName = "[PanelWideWidgetTracker]";
+#include logging.js
+
+let gPanel = CustomizableUI.AREA_PANEL;
+// We keep track of the widget placements for the panel locally:
+let gPanelPlacements = [];
+
+// All the wide widgets we know of:
+let gWideWidgets = new Set();
+// All the widgets we know of:
+let gSeenWidgets = new Set();
+
+// The class by which we recognize wide widgets:
+const kWidePanelItemClass = "panel-wide-item";
+
+// TODO(bug 885574): Merge this constant with the one in CustomizeMode.jsm,
+//                   maybe just use a pref for this.
+const kColumnsInMenuPanel = 3;
+
+let PanelWideWidgetTracker = {
+  // Listeners used to validate panel contents whenever they change:
+  onWidgetAdded: function(aWidgetId, aArea, aPosition) {
+    if (aArea == gPanel) {
+      gPanelPlacements = CustomizableUI.getWidgetIdsInArea(gPanel);
+      let moveForward = this.shouldMoveForward(aWidgetId, aPosition);
+      this.adjustWidgets(aWidgetId, moveForward);
+    }
+  },
+  onWidgetMoved: function(aWidgetId, aArea, aOldPosition, aNewPosition) {
+    if (aArea == gPanel) {
+      gPanelPlacements = CustomizableUI.getWidgetIdsInArea(gPanel);
+      let moveForward = this.shouldMoveForward(aWidgetId, aNewPosition);
+      this.adjustWidgets(aWidgetId, moveForward);
+    }
+  },
+  onWidgetRemoved: function(aWidgetId, aPrevArea) {
+    if (aPrevArea == gPanel) {
+      gPanelPlacements = CustomizableUI.getWidgetIdsInArea(gPanel);
+      let pos = gPanelPlacements.indexOf(aWidgetId);
+      this.adjustWidgets(aWidgetId, false);
+    }
+  },
+  onWidgetReset: function(aWidgetId) {
+    gPanelPlacements = CustomizableUI.getWidgetIdsInArea(gPanel);
+  },
+  // Listener to keep abreast of any new nodes. We use the DOM one because
+  // we need access to the actual node's classlist, so we can't use the ones above.
+  // Furthermore, onWidgetCreated only fires for API-based widgets, not for XUL ones.
+  onWidgetAfterDOMChange: function(aNode, aNextNode, aContainer) {
+    if (!gSeenWidgets.has(aNode.id)) {
+      if (aNode.classList.contains(kWidePanelItemClass)) {
+        gWideWidgets.add(aNode.id);
+      }
+      gSeenWidgets.add(aNode.id);
+    }
+  },
+  // When widgets get destroyed, we remove them from our sets of stuff we care about:
+  onWidgetDestroyed: function(aWidgetId) {
+    gSeenWidgets.delete(aWidgetId);
+    gWideWidgets.delete(aWidgetId);
+  },
+  shouldMoveForward: function(aWidgetId, aPosition) {
+    let currentWidgetAtPosition = gPanelPlacements[aPosition + 1];
+    return gWideWidgets.has(currentWidgetAtPosition) && !gWideWidgets.has(aWidgetId);
+  },
+  adjustWidgets: function(aWidgetId, aMoveForwards) {
+    if (this.adjusting) {
+      return;
+    }
+    this.adjusting = true;
+    let widgetsAffected = [w for (w of gPanelPlacements) if (gWideWidgets.has(w))];
+    // If we're moving the wide widgets forwards (down/to the right in the panel)
+    // we want to start with the last widgets. Otherwise we move widgets over other wide
+    // widgets, which might mess up their order. Likewise, if moving backwards we should start with
+    // the first widget and work our way down/right from there.
+    let compareFn = aMoveForwards ? (function(a, b) a < b) : (function(a, b) a > b)
+    widgetsAffected.sort(function(a, b) compareFn(gPanelPlacements.indexOf(a),
+                                                  gPanelPlacements.indexOf(b)));
+    for (let widget of widgetsAffected) {
+      this.adjustPosition(widget, aMoveForwards);
+    }
+    this.adjusting = false;
+  },
+  // This function is called whenever an item gets moved in the menu panel. It
+  // adjusts the position of widgets within the panel to prevent "gaps" between
+  // wide widgets that could be filled up with single column widgets
+  adjustPosition: function(aWidgetId, aMoveForwards) {
+    // Make sure that there are n % columns = 0 narrow buttons before the widget.
+    let placementIndex = gPanelPlacements.indexOf(aWidgetId);
+    let prevSiblingCount = 0;
+    let fixedPos = null;
+    while (placementIndex--) {
+      let thisWidgetId = gPanelPlacements[placementIndex];
+      if (gWideWidgets.has(thisWidgetId)) {
+        continue;
+      }
+      let widgetWrapper = CustomizableUI.getWidget(gPanelPlacements[placementIndex]);
+      // This widget might not actually exist:
+      if (!widgetWrapper) {
+        continue;
+      }
+      // This widget might still not actually exist:
+      if (widgetWrapper.provider == CustomizableUI.PROVIDER_XUL &&
+          widgetWrapper.instances.length == 0) {
+        continue;
+      }
+
+      // Or it might only be there some of the time:
+      if (widgetWrapper.provider == CustomizableUI.PROVIDER_API &&
+          widgetWrapper.showInPrivateBrowsing === false) {
+        if (!fixedPos) {
+          fixedPos = placementIndex;
+        } else {
+          fixedPos = Math.min(fixedPos, placementIndex);
+        }
+        // We want to position ourselves before this item:
+        prevSiblingCount = 0;
+      } else {
+        prevSiblingCount++;
+      }
+    }
+
+    if (fixedPos !== null || prevSiblingCount % kColumnsInMenuPanel) {
+      let desiredPos = (fixedPos !== null) ? fixedPos : gPanelPlacements.indexOf(aWidgetId);
+      let desiredChange = -(prevSiblingCount % kColumnsInMenuPanel);
+      if (aMoveForwards && fixedPos == null) {
+        // +1 because otherwise we'd count ourselves:
+        desiredChange = kColumnsInMenuPanel + desiredChange + 1;
+      }
+      desiredPos += desiredChange;
+      CustomizableUI.moveWidgetWithinArea(aWidgetId, desiredPos);
+    }
+  },
+  init: function() {
+    // Initialize our local placements copy and register the listener
+    gPanelPlacements = CustomizableUI.getWidgetIdsInArea(gPanel);
+    CustomizableUI.addListener(this);
+  },
+};

browser/components/customizableui/src/ScrollbarSampler.jsm

@@ -0,0 +1,66 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+this.EXPORTED_SYMBOLS = ["ScrollbarSampler"];
+
+const {classes: Cc, interfaces: Ci, utils: Cu, results: Cr} = Components;
+
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "Promise",
+                                  "resource://gre/modules/Promise.jsm");
+
+let gSystemScrollbarWidth = null;
+
+this.ScrollbarSampler = {
+  getSystemScrollbarWidth: function() {
+    let deferred = Promise.defer();
+
+    if (gSystemScrollbarWidth !== null) {
+      deferred.resolve(gSystemScrollbarWidth);
+      return deferred.promise;
+    }
+
+    this._sampleSystemScrollbarWidth().then(function(systemScrollbarWidth) {
+      gSystemScrollbarWidth = systemScrollbarWidth;
+      deferred.resolve(gSystemScrollbarWidth);
+    });
+    return deferred.promise;
+  },
+
+  _sampleSystemScrollbarWidth: function() {
+    let deferred = Promise.defer();
+    let hwin = Services.appShell.hiddenDOMWindow;
+    let hdoc = hwin.document.documentElement;
+    let iframe = hwin.document.createElementNS("http://www.w3.org/1999/xhtml",
+                                               "html:iframe");
+    iframe.setAttribute("srcdoc", '<body style="overflow-y: scroll"></body>');
+    hdoc.appendChild(iframe);
+
+    let cwindow = iframe.contentWindow;
+    let utils = cwindow.QueryInterface(Ci.nsIInterfaceRequestor)
+                       .getInterface(Ci.nsIDOMWindowUtils);
+
+    cwindow.addEventListener("load", function onLoad(aEvent) {
+      cwindow.removeEventListener("load", onLoad);
+      let sbWidth = {};
+      try {
+        utils.getScrollbarSize(true, sbWidth, {});
+      } catch(e) {
+        Cu.reportError("Could not sample scrollbar size: " + e + " -- " +
+                       e.stack);
+        sbWidth.value = 0;
+      }
+      // Minimum width of 10 so that we have enough padding:
+      sbWidth.value = Math.max(sbWidth.value, 10);
+      deferred.resolve(sbWidth.value);
+      iframe.remove();
+    });
+
+    return deferred.promise;
+  }
+};
+Object.freeze(this.ScrollbarSampler);

browser/components/customizableui/src/logging.js

@@ -0,0 +1,25 @@
+#if 0
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#endif
+
+XPCOMUtils.defineLazyModuleGetter(this, "console",
+  "resource://gre/modules/devtools/Console.jsm");
+
+let gDebug = false;
+try {
+  gDebug = Services.prefs.getBoolPref(kPrefCustomizationDebug);
+} catch (e) {}
+
+function LOG(...args) {
+  if (gDebug) {
+    args.unshift(gModuleName);
+    console.log.apply(console, args);
+  }
+}
+
+function ERROR(...args) {
+  args.unshift(gModuleName);
+  console.error.apply(console, args);
+}

browser/components/customizableui/src/moz.build

@@ -0,0 +1,16 @@
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXTRA_JS_MODULES += [
+    'ScrollbarSampler.jsm',
+]
+
+EXTRA_PP_JS_MODULES += [
+    'CustomizableUI.jsm',
+    'CustomizableWidgets.jsm',
+    'CustomizeMode.jsm',
+    'PanelWideWidgetTracker.jsm',
+]

browser/components/customizableui/test/browser.ini

@@ -0,0 +1,32 @@
+[DEFAULT]
+support-files =
+  head.js
+
+[browser_873501_handle_specials.js]
+[browser_876926_customize_mode_wrapping.js]
+[browser_876944_customize_mode_create_destroy.js]
+[browser_877006_missing_view.js]
+[browser_877178_unregisterArea.js]
+[browser_877447_skip_missing_ids.js]
+[browser_878452_drag_to_panel.js]
+[browser_880382_drag_wide_widgets_in_panel.js]
+[browser_885530_showInPrivateBrowsing.js]
+[browser_886323_buildArea_removable_nodes.js]
+[browser_887438_currentset_shim.js]
+[browser_888817_currentset_updating.js]
+[browser_890140_orphaned_placeholders.js]
+[browser_890262_destroyWidget_after_add_to_panel.js]
+[browser_892955_isWidgetRemovable_for_removed_widgets.js]
+[browser_892956_destroyWidget_defaultPlacements.js]
+[browser_909779_overflow_toolbars_new_window.js]
+[browser_913972_currentset_overflow.js]
+
+[browser_914138_widget_API_overflowable_toolbar.js]
+# Because of the specific widths, this test is fragile and won't necessarily pass on other platforms
+run-if = os == "mac"
+
+[browser_914863_disabled_help_quit_buttons.js]
+[browser_918049_skipintoolbarset_dnd.js]
+[browser_923857_customize_mode_event_wrapping_during_reset.js]
+[browser_927717_customize_drag_empty_toolbar.js]
+

browser/components/customizableui/test/browser_873501_handle_specials.js

@@ -0,0 +1,91 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const kToolbarName = "test-specials-toolbar";
+
+let gTests = [
+  {
+    desc: "Add a toolbar with two springs and the downloads button.",
+    run: function() {
+      // Create the toolbar with a single spring:
+      createToolbarWithPlacements(kToolbarName, ["spring"]);
+      ok(document.getElementById(kToolbarName), "Toolbar should be created.");
+
+      // Check it's there with a generated ID:
+      assertAreaPlacements(kToolbarName, [/customizableui-special-spring\d+/]);
+      let [springId] = getAreaWidgetIds(kToolbarName);
+
+      // Add a second spring, check if that's there and doesn't share IDs
+      CustomizableUI.addWidgetToArea("spring", kToolbarName);
+      assertAreaPlacements(kToolbarName, [springId,
+                                          /customizableui-special-spring\d+/]);
+      let [, spring2Id] = getAreaWidgetIds(kToolbarName);
+
+      isnot(springId, spring2Id, "Springs shouldn't have identical IDs.");
+
+      // Try moving the downloads button to this new toolbar, between the two springs:
+      CustomizableUI.addWidgetToArea("downloads-button", kToolbarName, 1);
+      assertAreaPlacements(kToolbarName, [springId, "downloads-button", spring2Id]);
+    },
+    teardown: removeCustomToolbars
+  },
+  {
+    desc: "Add separators around the downloads button.",
+    run: function() {
+      createToolbarWithPlacements(kToolbarName, ["separator"]);
+      ok(document.getElementById(kToolbarName), "Toolbar should be created.");
+
+      // Check it's there with a generated ID:
+      assertAreaPlacements(kToolbarName, [/customizableui-special-separator\d+/]);
+      let [separatorId] = getAreaWidgetIds(kToolbarName);
+
+      CustomizableUI.addWidgetToArea("separator", kToolbarName);
+      assertAreaPlacements(kToolbarName, [separatorId,
+                                          /customizableui-special-separator\d+/]);
+      let [, separator2Id] = getAreaWidgetIds(kToolbarName);
+
+      isnot(separatorId, separator2Id, "Separator ids shouldn't be equal.");
+
+      CustomizableUI.addWidgetToArea("downloads-button", kToolbarName, 1);
+      assertAreaPlacements(kToolbarName, [separatorId, "downloads-button", separator2Id]);
+    },
+    teardown: removeCustomToolbars
+  },
+  {
+    desc: "Add spacers around the downloads button.",
+    run: function() {
+      createToolbarWithPlacements(kToolbarName, ["spacer"]);
+      ok(document.getElementById(kToolbarName), "Toolbar should be created.");
+
+      // Check it's there with a generated ID:
+      assertAreaPlacements(kToolbarName, [/customizableui-special-spacer\d+/]);
+      let [spacerId] = getAreaWidgetIds(kToolbarName);
+
+      CustomizableUI.addWidgetToArea("spacer", kToolbarName);
+      assertAreaPlacements(kToolbarName, [spacerId,
+                                          /customizableui-special-spacer\d+/]);
+      let [, spacer2Id] = getAreaWidgetIds(kToolbarName);
+
+      isnot(spacerId, spacer2Id, "Spacer ids shouldn't be equal.");
+
+      CustomizableUI.addWidgetToArea("downloads-button", kToolbarName, 1);
+      assertAreaPlacements(kToolbarName, [spacerId, "downloads-button", spacer2Id]);
+    },
+    teardown: removeCustomToolbars
+  }
+];
+
+function asyncCleanup() {
+  yield resetCustomization();
+}
+
+function cleanup() {
+  removeCustomToolbars();
+}
+
+function test() {
+  waitForExplicitFinish();
+  registerCleanupFunction(cleanup);
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_876926_customize_mode_wrapping.js

@@ -0,0 +1,173 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const kXULWidgetId = "sync-button";
+const kAPIWidgetId = "feed-button";
+const kPanel = CustomizableUI.AREA_PANEL;
+const kToolbar = CustomizableUI.AREA_NAVBAR;
+const kVisiblePalette = "customization-palette";
+const kPlaceholderClass = "panel-customization-placeholder";
+
+function checkWrapper(id) {
+  is(document.querySelectorAll("#wrapper-" + id).length, 1, "There should be exactly 1 wrapper for " + id + " in the customizing window.");
+}
+
+let move = {
+  "drag": function(id, target) {
+    let targetNode = document.getElementById(target);
+    if (targetNode.customizationTarget) {
+      targetNode = targetNode.customizationTarget;
+    }
+    simulateItemDrag(document.getElementById(id), targetNode);
+  },
+  "dragToItem": function(id, target) {
+    let targetNode = document.getElementById(target);
+    if (targetNode.customizationTarget) {
+      targetNode = targetNode.customizationTarget;
+    }
+    let items = targetNode.querySelectorAll("toolbarpaletteitem:not(." + kPlaceholderClass + ")");
+    if (target == kPanel) {
+      targetNode = items[items.length - 1];
+    } else {
+      targetNode = items[0];
+    }
+    simulateItemDrag(document.getElementById(id), targetNode);
+  },
+  "API": function(id, target) {
+    if (target == kVisiblePalette) {
+      return CustomizableUI.removeWidgetFromArea(id);
+    }
+    return CustomizableUI.addWidgetToArea(id, target, null);
+  }
+}
+
+function isLast(containerId, defaultPlacements, id) {
+  assertAreaPlacements(containerId, defaultPlacements.concat([id]));
+  is(document.getElementById(containerId).customizationTarget.lastChild.firstChild.id, id,
+     "Widget " + id + " should be in " + containerId + " in customizing window.");
+  is(otherWin.document.getElementById(containerId).customizationTarget.lastChild.id, id,
+     "Widget " + id + " should be in " + containerId + " in other window.");
+}
+
+function isFirst(containerId, defaultPlacements, id) {
+  assertAreaPlacements(containerId, [id].concat(defaultPlacements));
+  is(document.getElementById(containerId).customizationTarget.firstChild.firstChild.id, id,
+     "Widget " + id + " should be in " + containerId + " in customizing window.");
+  is(otherWin.document.getElementById(containerId).customizationTarget.firstChild.id, id,
+     "Widget " + id + " should be in " + containerId + " in other window.");
+}
+
+function checkToolbar(id, method) {
+  // Place at start of the toolbar:
+  let toolbarPlacements = getAreaWidgetIds(kToolbar);
+  move[method](id, kToolbar);
+  if (method == "dragToItem") {
+    isFirst(kToolbar, toolbarPlacements, id);
+  } else {
+    isLast(kToolbar, toolbarPlacements, id);
+  }
+  checkWrapper(id);
+}
+
+function checkPanel(id, method) {
+  let panelPlacements = getAreaWidgetIds(kPanel);
+  move[method](id, kPanel);
+  let children = document.getElementById(kPanel).querySelectorAll("toolbarpaletteitem:not(." + kPlaceholderClass + ")");
+  let otherChildren = otherWin.document.getElementById(kPanel).children;
+  let newPlacements = panelPlacements.concat([id]);
+  // Relative position of the new item from the end:
+  let position = -1;
+  // For the drag to item case, we drag to the last item, making the dragged item the
+  // penultimate item. We can't well use the first item because the panel has complicated
+  // rules about rearranging wide items (which, by default, the first two items are).
+  if (method == "dragToItem") {
+    newPlacements.pop();
+    newPlacements.splice(panelPlacements.length - 1, 0, id);
+    position = -2;
+  }
+  assertAreaPlacements(kPanel, newPlacements);
+  is(children[children.length + position].firstChild.id, id,
+     "Widget " + id + " should be in " + kPanel + " in customizing window.");
+  is(otherChildren[otherChildren.length + position].id, id,
+     "Widget " + id + " should be in " + kPanel + " in other window.");
+  checkWrapper(id);
+}
+
+function checkPalette(id, method) {
+  // Move back to palette:
+  move[method](id, kVisiblePalette);
+  ok(CustomizableUI.inDefaultState, "Should end in default state");
+  let visibleChildren = gCustomizeMode.visiblePalette.children;
+  let expectedChild = method == "dragToItem" ? visibleChildren[0] : visibleChildren[visibleChildren.length - 1];
+  is(expectedChild.firstChild.id, id, "Widget " + id + " should now be wrapped in palette in customizing window.");
+  if (id == kXULWidgetId) {
+    ok(otherWin.gNavToolbox.palette.querySelector("#" + id), "Widget " + id + " should be in invisible palette in other window.");
+  }
+  checkWrapper(id);
+}
+
+let otherWin;
+let gTests = [
+  {
+    desc: "Moving widgets in two windows, one with customize mode and one without, should work",
+    setup: startCustomizing,
+    run: function() {
+      otherWin = yield openAndLoadWindow(null, true);
+      // Open panel to force its construction:
+      yield afterPanelOpen(otherWin);
+
+      ok(CustomizableUI.inDefaultState, "Should start in default state");
+
+      for (let widgetId of [kXULWidgetId, kAPIWidgetId]) {
+        for (let method of ["API", "drag", "dragToItem"]) {
+          info("Moving widget " + widgetId + " using " + method);
+          checkToolbar(widgetId, method);
+          checkPanel(widgetId, method);
+          checkPalette(widgetId, method);
+          checkPanel(widgetId, method);
+          checkToolbar(widgetId, method);
+          checkPalette(widgetId, method);
+        }
+      }
+
+      otherWin.close();
+      otherWin = null;
+    },
+    teardown: function() {
+      if (otherWin) {
+        otherWin.close();
+      }
+      yield endCustomizing();
+    }
+  }
+];
+
+function afterPanelOpen(win) {
+  let panelEl = win.PanelUI.panel;
+  let deferred = Promise.defer();
+  function onPanelClose(e) {
+    panelEl.removeEventListener("popuphidden", onPanelClose);
+    deferred.resolve();
+  }
+  function onPanelOpen(e) {
+    panelEl.removeEventListener("popupshown", onPanelOpen);
+    panelEl.addEventListener("popuphidden", onPanelClose);
+    win.PanelUI.toggle({type: "command"});
+  };
+  panelEl.addEventListener("popupshown", onPanelOpen);
+  win.PanelUI.toggle({type: "command"});
+  return deferred.promise;
+}
+
+function asyncCleanup() {
+  Services.prefs.clearUserPref("browser.uiCustomization.skipSourceNodeCheck");
+  yield resetCustomization();
+}
+
+function test() {
+  Services.prefs.setBoolPref("browser.uiCustomization.skipSourceNodeCheck", true);
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}
+

browser/components/customizableui/test/browser_876944_customize_mode_create_destroy.js

@@ -0,0 +1,65 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const kTestWidget1 = "test-customize-mode-create-destroy1";
+const kTestWidget2 = "test-customize-mode-create-destroy2";
+
+let gTests = [
+  {
+    desc: "Creating and destroying a widget should correctly wrap/unwrap stuff",
+    setup: startCustomizing,
+    run: function() {
+      CustomizableUI.createWidget({id: kTestWidget1, label: 'Pretty label', tooltiptext: 'Pretty tooltip'});
+      let elem = document.getElementById(kTestWidget1);
+      let wrapper = document.getElementById("wrapper-" + kTestWidget1);
+      ok(elem, "There should be an item");
+      ok(wrapper, "There should be a wrapper");
+      is(wrapper.firstChild.id, kTestWidget1, "Wrapper should have test widget");
+      is(wrapper.parentNode.id, "customization-palette", "Wrapper should be in palette");
+      CustomizableUI.destroyWidget(kTestWidget1);
+      wrapper = document.getElementById("wrapper-" + kTestWidget1);
+      ok(!wrapper, "There should be a wrapper");
+      let item = document.getElementById(kTestWidget1);
+      ok(!item, "There should no longer be an item");
+    },
+  },
+  {
+    desc: "Creating and destroying a widget should correctly deal with panel placeholders",
+    run: function() {
+      let panel = document.getElementById(CustomizableUI.AREA_PANEL);
+      is(panel.querySelectorAll(".panel-customization-placeholder").length, 3, "The number of placeholders should be correct.");
+      CustomizableUI.createWidget({id: kTestWidget2, label: 'Pretty label', tooltiptext: 'Pretty tooltip', defaultArea: CustomizableUI.AREA_PANEL});
+      let elem = document.getElementById(kTestWidget2);
+      let wrapper = document.getElementById("wrapper-" + kTestWidget2);
+      ok(elem, "There should be an item");
+      ok(wrapper, "There should be a wrapper");
+      is(wrapper.firstChild.id, kTestWidget2, "Wrapper should have test widget");
+      is(wrapper.parentNode, panel, "Wrapper should be in panel");
+      is(panel.querySelectorAll(".panel-customization-placeholder").length, 2, "The number of placeholders should be correct.");
+      CustomizableUI.destroyWidget(kTestWidget2);
+      wrapper = document.getElementById("wrapper-" + kTestWidget2);
+      ok(!wrapper, "There should be a wrapper");
+      let item = document.getElementById(kTestWidget2);
+      ok(!item, "There should no longer be an item");
+    },
+    teardown: endCustomizing
+  },
+];
+
+function asyncCleanup() {
+  yield endCustomizing();
+  try {
+    CustomizableUI.destroyWidget(kTestWidget1);
+  } catch (ex) {}
+  try {
+    CustomizableUI.destroyWidget(kTestWidget2);
+  } catch (ex) {}
+  yield resetCustomization();
+}
+
+
+function test() {
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_877006_missing_view.js

@@ -0,0 +1,50 @@
+/* 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/. */
+
+let gTests = [
+  {
+    desc: "Should be able to add broken view widget",
+    run: function() {
+      const kWidgetId = 'test-877006-broken-widget';
+      let widgetSpec = {
+        id: kWidgetId,
+        type: 'view',
+        viewId: 'idontexist',
+        /* Empty handler so we try to attach it maybe? */
+        onViewShowing: function() {
+        },
+      };
+
+      let noError = true;
+      try {
+        CustomizableUI.createWidget(widgetSpec);
+        CustomizableUI.addWidgetToArea(kWidgetId, CustomizableUI.AREA_NAVBAR);
+      } catch (ex) {
+        Cu.reportError(ex);
+        noError = false;
+      }
+      ok(noError, "Should not throw an exception trying to add a broken view widget.");
+
+      noError = true;
+      try {
+        CustomizableUI.destroyWidget(kWidgetId);
+      } catch (ex) {
+        Cu.reportError(ex);
+        noError = false;
+      }
+      ok(noError, "Should not throw an exception trying to remove the broken view widget.");
+    }
+  }
+];
+
+
+function asyncCleanup() {
+  yield resetCustomization();
+}
+
+function test() {
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}
+

browser/components/customizableui/test/browser_877178_unregisterArea.js

@@ -0,0 +1,67 @@
+/* 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/. */
+
+let gTests = [
+  {
+    desc: "Sanity checks",
+    run: function() {
+      SimpleTest.doesThrow(function() CustomizableUI.registerArea("@foo"),
+                           "Registering areas with an invalid ID should throw.");
+
+      SimpleTest.doesThrow(function() CustomizableUI.registerArea([]),
+                           "Registering areas with an invalid ID should throw.");
+
+      SimpleTest.doesThrow(function() CustomizableUI.registerArea(CustomizableUI.AREA_NAVBAR),
+                           "Registering an area with an ID that's already registered should throw.");
+
+      SimpleTest.doesThrow(function() CustomizableUI.unregisterArea("@foo"),
+                           "Unregistering areas with an invalid ID should throw.");
+
+      SimpleTest.doesThrow(function() CustomizableUI.unregisterArea([]),
+                           "Unregistering areas with an invalid ID should throw.");
+
+      SimpleTest.doesThrow(function() CustomizableUI.unregisterArea("unknown"),
+                           "Unregistering an area that's not registered should throw.");
+    }
+  },
+  {
+    desc: "Check areas are loaded with their default placements.",
+    run: function() {
+      ok(CustomizableUI.inDefaultState, "Everything should be in its default state.");
+    }
+  },
+  {
+    desc: "Check registering and unregistering a new area.",
+    run: function() {
+      const kToolbarId = "test-registration-toolbar";
+      const kButtonId = "test-registration-button";
+      createDummyXULButton(kButtonId);
+      createToolbarWithPlacements(kToolbarId, ["spring", kButtonId, "spring"]);
+      assertAreaPlacements(kToolbarId,
+                           [/customizableui-special-spring\d+/,
+                            kButtonId,
+                            /customizableui-special-spring\d+/]);
+      ok(CustomizableUI.inDefaultState, "With a new toolbar and default placements, " +
+                                        "everything should still be in a default state.");
+      removeCustomToolbars(); // Will call unregisterArea for us
+      ok(CustomizableUI.inDefaultState, "When the toolbar is unregistered, " +
+                                        "everything should still be in a default state.");
+    }
+  }
+];
+
+function asyncCleanup() {
+  yield resetCustomization();
+}
+
+function cleanup() {
+  removeCustomToolbars();
+}
+
+function test() {
+  waitForExplicitFinish();
+  registerCleanupFunction(cleanup);
+  runTests(gTests, asyncCleanup);
+}
+

browser/components/customizableui/test/browser_877447_skip_missing_ids.js

@@ -0,0 +1,35 @@
+/* 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/. */
+
+let gTests = [
+  {
+    run: function() {
+      const kButtonId = "look-at-me-disappear-button";
+      CustomizableUI.reset();
+      ok(CustomizableUI.inDefaultState, "Should be in the default state.");
+      let btn = createDummyXULButton(kButtonId, "Gone!");
+      CustomizableUI.addWidgetToArea(kButtonId, CustomizableUI.AREA_NAVBAR);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in the default state.");
+      is(btn.parentNode.parentNode.id, CustomizableUI.AREA_NAVBAR, "Button should be in navbar");
+      btn.remove();
+      is(btn.parentNode, null, "Button is no longer in the navbar");
+      ok(CustomizableUI.inDefaultState, "Should be back in the default state, " +
+                                        "despite unknown button ID in placements.");
+    }
+  }
+];
+
+function asyncCleanup() {
+  yield resetCustomization();
+}
+
+function cleanup() {
+  removeCustomToolbars();
+}
+
+function test() {
+  waitForExplicitFinish();
+  registerCleanupFunction(cleanup);
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_878452_drag_to_panel.js

@@ -0,0 +1,80 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+let gTests = [
+  {
+    desc: "Dragging an item from the palette to another button in the panel should work.",
+    setup: startCustomizing,
+    run: function() {
+      let btn = document.getElementById("developer-button");
+      let panel = document.getElementById(CustomizableUI.AREA_PANEL);
+      let placements = getAreaWidgetIds(CustomizableUI.AREA_PANEL);
+
+      let lastButtonIndex = placements.length - 1;
+      let lastButton = placements[lastButtonIndex];
+      let placementsAfterInsert = placements.slice(0, lastButtonIndex).concat(["developer-button", lastButton]);
+      let lastButtonNode = document.getElementById(lastButton);
+      simulateItemDrag(btn, lastButtonNode);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterInsert);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in default state.");
+      let palette = document.getElementById("customization-palette");
+      simulateItemDrag(btn, palette);
+      ok(CustomizableUI.inDefaultState, "Should be in default state again.");
+    },
+  },
+  {
+    desc: "Dragging an item from the palette to the panel itself should also work.",
+    setup: startCustomizing,
+    run: function() {
+      let btn = document.getElementById("developer-button");
+      let panel = document.getElementById(CustomizableUI.AREA_PANEL);
+      let placements = getAreaWidgetIds(CustomizableUI.AREA_PANEL);
+
+      let placementsAfterAppend = placements.concat(["developer-button"]);
+      simulateItemDrag(btn, panel);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterAppend);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in default state.");
+      let palette = document.getElementById("customization-palette");
+      simulateItemDrag(btn, palette);
+      ok(CustomizableUI.inDefaultState, "Should be in default state again.");
+    },
+  },
+  {
+    desc: "Dragging an item from the palette to an empty panel should also work.",
+    setup: function() {
+      let widgetIds = getAreaWidgetIds(CustomizableUI.AREA_PANEL);
+      while (widgetIds.length) {
+        CustomizableUI.removeWidgetFromArea(widgetIds.shift());
+      }
+      return startCustomizing()
+    },
+    run: function() {
+      let btn = document.getElementById("developer-button");
+      let panel = document.getElementById(CustomizableUI.AREA_PANEL);
+
+      assertAreaPlacements(panel.id, []);
+
+      let placementsAfterAppend = ["developer-button"];
+      simulateItemDrag(btn, panel);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterAppend);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in default state.");
+      let palette = document.getElementById("customization-palette");
+      simulateItemDrag(btn, palette);
+      assertAreaPlacements(panel.id, []);
+    },
+  }
+];
+
+function asyncCleanup() {
+  yield endCustomizing();
+  Services.prefs.clearUserPref("browser.uiCustomization.skipSourceNodeCheck");
+  yield resetCustomization();
+}
+
+function test() {
+  Services.prefs.setBoolPref("browser.uiCustomization.skipSourceNodeCheck", true);
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}
+

browser/components/customizableui/test/browser_880382_drag_wide_widgets_in_panel.js

@@ -0,0 +1,424 @@
+/* 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/. */
+
+let gTests = [
+  {
+    desc: "Dragging the zoom controls to be before the print button " +
+          "should not move any controls.",
+    setup: startCustomizing,
+    run: function() {
+      let zoomControls = document.getElementById("zoom-controls");
+      let printButton = document.getElementById("print-button");
+      let placementsAfterMove = ["edit-controls",
+                                 "new-window-button",
+                                 "privatebrowsing-button",
+                                 "save-page-button",
+                                 "zoom-controls",
+                                 "print-button",
+                                 "history-panelmenu",
+                                 "fullscreen-button",
+                                 "find-button",
+                                 "preferences-button",
+                                 "add-ons-button"];
+      simulateItemDrag(zoomControls, printButton);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterMove);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in default state.");
+      let newWindowButton = document.getElementById("new-window-button");
+      simulateItemDrag(zoomControls, newWindowButton);
+      ok(CustomizableUI.inDefaultState, "Should be in default state again.");
+    },
+  },
+  {
+    desc: "Dragging the zoom controls to be before the save button " +
+          "should not move any controls.",
+    setup: startCustomizing,
+    run: function() {
+      let zoomControls = document.getElementById("zoom-controls");
+      let savePageButton = document.getElementById("save-page-button");
+      let placementsAfterMove = ["edit-controls",
+                                 "zoom-controls",
+                                 "new-window-button",
+                                 "privatebrowsing-button",
+                                 "save-page-button",
+                                 "print-button",
+                                 "history-panelmenu",
+                                 "fullscreen-button",
+                                 "find-button",
+                                 "preferences-button",
+                                 "add-ons-button"];
+      simulateItemDrag(zoomControls, savePageButton);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterMove);
+      ok(CustomizableUI.inDefaultState, "Should be in default state.");
+    },
+  },
+  {
+    desc: "Dragging the zoom controls to be before the new-window " +
+          "button should not move any widgets.",
+    setup: startCustomizing,
+    run: function() {
+      let zoomControls = document.getElementById("zoom-controls");
+      let newWindowButton = document.getElementById("new-window-button");
+      let placementsAfterMove = ["edit-controls",
+                                 "zoom-controls",
+                                 "new-window-button",
+                                 "privatebrowsing-button",
+                                 "save-page-button",
+                                 "print-button",
+                                 "history-panelmenu",
+                                 "fullscreen-button",
+                                 "find-button",
+                                 "preferences-button",
+                                 "add-ons-button"];
+      simulateItemDrag(zoomControls, newWindowButton);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterMove);
+      ok(CustomizableUI.inDefaultState, "Should still be in default state.");
+    },
+  },
+  {
+    desc: "Dragging the zoom controls to be before the history-panelmenu " +
+          "should move the zoom-controls in to the row higher than the " +
+          "history-panelmenu.",
+    setup: startCustomizing,
+    run: function() {
+      let zoomControls = document.getElementById("zoom-controls");
+      let historyPanelMenu = document.getElementById("history-panelmenu");
+      let placementsAfterMove = ["edit-controls",
+                                 "new-window-button",
+                                 "privatebrowsing-button",
+                                 "save-page-button",
+                                 "zoom-controls",
+                                 "print-button",
+                                 "history-panelmenu",
+                                 "fullscreen-button",
+                                 "find-button",
+                                 "preferences-button",
+                                 "add-ons-button"];
+      simulateItemDrag(zoomControls, historyPanelMenu);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterMove);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in default state.");
+      let newWindowButton = document.getElementById("new-window-button");
+      simulateItemDrag(zoomControls, newWindowButton);
+      ok(CustomizableUI.inDefaultState, "Should be in default state again.");
+    },
+  },
+  {
+    desc: "Dragging the zoom controls to be before the preferences-button " +
+          "should move the zoom-controls in to the row higher than the " +
+          "preferences-button.",
+    setup: startCustomizing,
+    run: function() {
+      let zoomControls = document.getElementById("zoom-controls");
+      let preferencesButton = document.getElementById("preferences-button");
+      let placementsAfterMove = ["edit-controls",
+                                 "new-window-button",
+                                 "privatebrowsing-button",
+                                 "save-page-button",
+                                 "print-button",
+                                 "history-panelmenu",
+                                 "fullscreen-button",
+                                 "zoom-controls",
+                                 "find-button",
+                                 "preferences-button",
+                                 "add-ons-button"];
+      simulateItemDrag(zoomControls, preferencesButton);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterMove);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in default state.");
+      let newWindowButton = document.getElementById("new-window-button");
+      simulateItemDrag(zoomControls, newWindowButton);
+      ok(CustomizableUI.inDefaultState, "Should be in default state again.");
+    },
+  },
+  {
+    desc: "Dragging an item from the palette to before the zoom-controls " +
+          "should move it and two other buttons before the zoom controls.",
+    setup: startCustomizing,
+    run: function() {
+      let developerButton = document.getElementById("developer-button");
+      let zoomControls = document.getElementById("zoom-controls");
+      let placementsAfterInsert = ["edit-controls",
+                                   "developer-button",
+                                   "new-window-button",
+                                   "privatebrowsing-button",
+                                   "zoom-controls",
+                                   "save-page-button",
+                                   "print-button",
+                                   "history-panelmenu",
+                                   "fullscreen-button",
+                                   "find-button",
+                                   "preferences-button",
+                                   "add-ons-button"];
+      simulateItemDrag(developerButton, zoomControls);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterInsert);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in default state.");
+      let palette = document.getElementById("customization-palette");
+      // Check that the palette items are re-wrapped correctly.
+      let feedWrapper = document.getElementById("wrapper-feed-button");
+      let feedButton = document.getElementById("feed-button");
+      is(feedButton.parentNode, feedWrapper,
+         "feed-button should be a child of wrapper-feed-button");
+      is(feedWrapper.getAttribute("place"), "palette",
+         "The feed-button wrapper should have it's place set to 'palette'");
+      simulateItemDrag(developerButton, palette);
+      is(developerButton.parentNode.tagName, "toolbarpaletteitem",
+         "The developer-button should be wrapped by a toolbarpaletteitem");
+      let newWindowButton = document.getElementById("new-window-button");
+      simulateItemDrag(zoomControls, newWindowButton);
+      ok(CustomizableUI.inDefaultState, "Should be in default state again.");
+    },
+  },
+  {
+    desc: "Dragging an item from the palette to before the edit-controls " +
+          "should move it and two other buttons before the edit and zoom controls.",
+    setup: startCustomizing,
+    run: function() {
+      let developerButton = document.getElementById("developer-button");
+      let editControls = document.getElementById("edit-controls");
+      let placementsAfterInsert = ["developer-button",
+                                   "new-window-button",
+                                   "privatebrowsing-button",
+                                   "edit-controls",
+                                   "zoom-controls",
+                                   "save-page-button",
+                                   "print-button",
+                                   "history-panelmenu",
+                                   "fullscreen-button",
+                                   "find-button",
+                                   "preferences-button",
+                                   "add-ons-button"];
+      simulateItemDrag(developerButton, editControls);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterInsert);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in default state.");
+      let palette = document.getElementById("customization-palette");
+      // Check that the palette items are re-wrapped correctly.
+      let feedWrapper = document.getElementById("wrapper-feed-button");
+      let feedButton = document.getElementById("feed-button");
+      is(feedButton.parentNode, feedWrapper,
+         "feed-button should be a child of wrapper-feed-button");
+      is(feedWrapper.getAttribute("place"), "palette",
+         "The feed-button wrapper should have it's place set to 'palette'");
+      simulateItemDrag(developerButton, palette);
+      is(developerButton.parentNode.tagName, "toolbarpaletteitem",
+         "The developer-button should be wrapped by a toolbarpaletteitem");
+      ok(CustomizableUI.inDefaultState, "Should be in default state again.");
+    },
+  },
+  {
+    desc: "Dragging the edit-controls to be before the zoom-controls button " +
+          "should not move any widgets.",
+    setup: startCustomizing,
+    run: function() {
+      let editControls = document.getElementById("edit-controls");
+      let zoomControls = document.getElementById("zoom-controls");
+      let placementsAfterMove = ["edit-controls",
+                                 "zoom-controls",
+                                 "new-window-button",
+                                 "privatebrowsing-button",
+                                 "save-page-button",
+                                 "print-button",
+                                 "history-panelmenu",
+                                 "fullscreen-button",
+                                 "find-button",
+                                 "preferences-button",
+                                 "add-ons-button"];
+      simulateItemDrag(editControls, zoomControls);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterMove);
+      ok(CustomizableUI.inDefaultState, "Should still be in default state.");
+    },
+  },
+  {
+    desc: "Dragging the edit-controls to be before the new-window-button should " +
+          "move the zoom-controls before the edit-controls.",
+    setup: startCustomizing,
+    run: function() {
+      let editControls = document.getElementById("edit-controls");
+      let newWindowButton = document.getElementById("new-window-button");
+      let placementsAfterMove = ["zoom-controls",
+                                 "edit-controls",
+                                 "new-window-button",
+                                 "privatebrowsing-button",
+                                 "save-page-button",
+                                 "print-button",
+                                 "history-panelmenu",
+                                 "fullscreen-button",
+                                 "find-button",
+                                 "preferences-button",
+                                 "add-ons-button"];
+      simulateItemDrag(editControls, newWindowButton);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterMove);
+      let zoomControls = document.getElementById("zoom-controls");
+      simulateItemDrag(editControls, zoomControls);
+      ok(CustomizableUI.inDefaultState, "Should still be in default state.");
+    },
+  },
+  {
+    desc: "Dragging the edit-controls to be before the privatebrowsing-button " +
+          "should move the edit-controls in to the row higher than the " +
+          "privatebrowsing-button.",
+    setup: startCustomizing,
+    run: function() {
+      let editControls = document.getElementById("edit-controls");
+      let privateBrowsingButton = document.getElementById("privatebrowsing-button");
+      let placementsAfterMove = ["zoom-controls",
+                                 "edit-controls",
+                                 "new-window-button",
+                                 "privatebrowsing-button",
+                                 "save-page-button",
+                                 "print-button",
+                                 "history-panelmenu",
+                                 "fullscreen-button",
+                                 "find-button",
+                                 "preferences-button",
+                                 "add-ons-button"];
+      simulateItemDrag(editControls, privateBrowsingButton);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterMove);
+      let zoomControls = document.getElementById("zoom-controls");
+      simulateItemDrag(editControls, zoomControls);
+      ok(CustomizableUI.inDefaultState, "Should still be in default state.");
+    },
+  },
+  {
+    desc: "Dragging the edit-controls to be before the save-page-button " +
+          "should move the edit-controls in to the row higher than the " +
+          "save-page-button.",
+    setup: startCustomizing,
+    run: function() {
+      let editControls = document.getElementById("edit-controls");
+      let savePageButton = document.getElementById("save-page-button");
+      let placementsAfterMove = ["zoom-controls",
+                                 "edit-controls",
+                                 "new-window-button",
+                                 "privatebrowsing-button",
+                                 "save-page-button",
+                                 "print-button",
+                                 "history-panelmenu",
+                                 "fullscreen-button",
+                                 "find-button",
+                                 "preferences-button",
+                                 "add-ons-button"];
+      simulateItemDrag(editControls, savePageButton);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterMove);
+      let zoomControls = document.getElementById("zoom-controls");
+      simulateItemDrag(editControls, zoomControls);
+      ok(CustomizableUI.inDefaultState, "Should still be in default state.");
+    },
+  },
+  {
+    desc: "Dragging the edit-controls to the panel itself should append " +
+          "the edit controls to the bottom of the panel.",
+    setup: startCustomizing,
+    run: function() {
+      let editControls = document.getElementById("edit-controls");
+      let panel = document.getElementById(CustomizableUI.AREA_PANEL);
+      let placementsAfterMove = ["zoom-controls",
+                                 "new-window-button",
+                                 "privatebrowsing-button",
+                                 "save-page-button",
+                                 "print-button",
+                                 "history-panelmenu",
+                                 "fullscreen-button",
+                                 "find-button",
+                                 "preferences-button",
+                                 "add-ons-button",
+                                 "edit-controls"];
+      simulateItemDrag(editControls, panel);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterMove);
+      let zoomControls = document.getElementById("zoom-controls");
+      simulateItemDrag(editControls, zoomControls);
+      ok(CustomizableUI.inDefaultState, "Should still be in default state.");
+    },
+  },
+  {
+    desc: "Dragging the edit-controls to the customization-palette and " +
+          "back should work.",
+    setup: startCustomizing,
+    run: function() {
+      let editControls = document.getElementById("edit-controls");
+      let palette = document.getElementById("customization-palette");
+      let placementsAfterMove = ["zoom-controls",
+                                 "new-window-button",
+                                 "privatebrowsing-button",
+                                 "save-page-button",
+                                 "print-button",
+                                 "history-panelmenu",
+                                 "fullscreen-button",
+                                 "find-button",
+                                 "preferences-button",
+                                 "add-ons-button"];
+      let paletteChildElementCount = palette.childElementCount;
+      simulateItemDrag(editControls, palette);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterMove);
+      is(paletteChildElementCount + 1, palette.childElementCount,
+         "The palette should have a new child, congratulations!");
+      is(editControls.parentNode.id, "wrapper-edit-controls",
+         "The edit-controls should be properly wrapped.");
+      is(editControls.parentNode.getAttribute("place"), "palette",
+         "The edit-controls should have the place of 'palette'.");
+      let zoomControls = document.getElementById("zoom-controls");
+      simulateItemDrag(editControls, zoomControls);
+      is(paletteChildElementCount, palette.childElementCount,
+         "The palette child count should have returned to its prior value.");
+      ok(CustomizableUI.inDefaultState, "Should still be in default state.");
+    },
+  },
+  {
+    desc: "Dragging the edit-controls to each of the panel placeholders " +
+          "should append the edit-controls to the bottom of the panel.",
+    setup: startCustomizing,
+    run: function() {
+      let editControls = document.getElementById("edit-controls");
+      let panel = document.getElementById(CustomizableUI.AREA_PANEL);
+      for (let i = 0; i < 3; i++) {
+        // NB: We can't just iterate over all of the placeholders
+        // because each drag-drop action recreates them.
+        let placeholder = panel.getElementsByClassName("panel-customization-placeholder")[i];
+        let placementsAfterMove = ["zoom-controls",
+                                   "new-window-button",
+                                   "privatebrowsing-button",
+                                   "save-page-button",
+                                   "print-button",
+                                   "history-panelmenu",
+                                   "fullscreen-button",
+                                   "find-button",
+                                   "preferences-button",
+                                   "add-ons-button",
+                                   "edit-controls"];
+        simulateItemDrag(editControls, placeholder);
+        assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterMove);
+        let zoomControls = document.getElementById("zoom-controls");
+        simulateItemDrag(editControls, zoomControls);
+        ok(CustomizableUI.inDefaultState, "Should still be in default state.");
+      }
+    },
+  },
+  {
+    desc: "Dragging the developer-button back on to itself should work.",
+    setup: startCustomizing,
+    run: function() {
+      let developerButton = document.getElementById("developer-button");
+      is(developerButton.parentNode.tagName, "toolbarpaletteitem",
+         "developer-button should be wrapped by a toolbarpaletteitem");
+      simulateItemDrag(developerButton, developerButton);
+      is(developerButton.parentNode.tagName, "toolbarpaletteitem",
+         "developer-button should be wrapped by a toolbarpaletteitem");
+      let editControls = document.getElementById("edit-controls");
+      is(editControls.parentNode.tagName, "toolbarpaletteitem",
+         "edit-controls should be wrapped by a toolbarpaletteitem");
+      ok(CustomizableUI.inDefaultState, "Should still be in default state.");
+    },
+  },
+];
+
+function asyncCleanup() {
+  yield endCustomizing();
+  Services.prefs.clearUserPref("browser.uiCustomization.skipSourceNodeCheck");
+  yield resetCustomization();
+}
+
+function test() {
+  Services.prefs.setBoolPref("browser.uiCustomization.skipSourceNodeCheck", true);
+  waitForExplicitFinish();
+  requestLongerTimeout(5);
+  runTests(gTests, asyncCleanup);
+}
+

browser/components/customizableui/test/browser_885530_showInPrivateBrowsing.js

@@ -0,0 +1,151 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const kWidgetId = "some-widget";
+
+function assertWidgetExists(aWindow, aExists) {
+  if (aExists) {
+    ok(aWindow.document.getElementById(kWidgetId),
+       "Should have found test widget in the window");
+  } else {
+    is(aWindow.document.getElementById(kWidgetId), null,
+       "Should not have found test widget in the window");
+  }
+}
+
+let gTests = [
+  {
+    desc: "A widget that is created with showInPrivateBrowsing undefined should " +
+          "have that value default to false.",
+    run: function() {
+      let wrapper = CustomizableUI.createWidget({
+        id: kWidgetId
+      });
+      ok(wrapper.showInPrivateBrowsing,
+         "showInPrivateBrowsing should have defaulted to true.");
+      CustomizableUI.destroyWidget(kWidgetId);
+    },
+  },
+  {
+    desc: "Add a widget via the API with showInPrivateBrowsing set to false " +
+          "and ensure it does not appear in pre-existing or newly created " +
+          "private windows.",
+    run: function() {
+      let plain = yield openAndLoadWindow();
+      let private = yield openAndLoadWindow({private: true});
+
+      CustomizableUI.createWidget({
+        id: kWidgetId,
+        removable: true,
+        showInPrivateBrowsing: false
+      });
+      CustomizableUI.addWidgetToArea(kWidgetId,
+                                     CustomizableUI.AREA_NAVBAR);
+      assertWidgetExists(plain, true);
+      assertWidgetExists(private, false);
+
+      // Now open up some new windows. The widget should exist in the new
+      // plain window, but not the new private window.
+      let plain2 = yield openAndLoadWindow();
+      let private2 = yield openAndLoadWindow({private: true});
+
+      assertWidgetExists(plain2, true);
+      assertWidgetExists(private2, false);
+
+      // Try moving the widget around and make sure it doesn't get added
+      // to the private windows. We'll start by appending it to the tabstrip.
+      CustomizableUI.addWidgetToArea(kWidgetId,
+                                     CustomizableUI.AREA_TABSTRIP);
+      assertWidgetExists(plain, true);
+      assertWidgetExists(plain2, true);
+      assertWidgetExists(private, false);
+      assertWidgetExists(private2, false);
+
+      // And then move it to the beginning of the tabstrip.
+      CustomizableUI.moveWidgetWithinArea(kWidgetId, 0);
+      assertWidgetExists(plain, true);
+      assertWidgetExists(plain2, true);
+      assertWidgetExists(private, false);
+      assertWidgetExists(private2, false);
+
+      CustomizableUI.removeWidgetFromArea("some-widget");
+      assertWidgetExists(plain, false);
+      assertWidgetExists(plain2, false);
+      assertWidgetExists(private, false);
+      assertWidgetExists(private2, false);
+
+      plain.close();
+      plain2.close();
+      private.close();
+      private2.close();
+
+      CustomizableUI.destroyWidget("some-widget");
+    },
+  },
+  {
+    desc: "Add a widget via the API with showInPrivateBrowsing set to true, " +
+          "and ensure that it appears in pre-existing or newly created " +
+          "private browsing windows.",
+    run: function() {
+      let plain = yield openAndLoadWindow();
+      let private = yield openAndLoadWindow({private: true});
+
+      CustomizableUI.createWidget({
+        id: kWidgetId,
+        removable: true,
+        showInPrivateBrowsing: true
+      });
+      CustomizableUI.addWidgetToArea(kWidgetId,
+                                     CustomizableUI.AREA_NAVBAR);
+      assertWidgetExists(plain, true);
+      assertWidgetExists(private, true);
+
+      // Now open up some new windows. The widget should exist in the new
+      // plain window, but not the new private window.
+      let plain2 = yield openAndLoadWindow();
+      let private2 = yield openAndLoadWindow({private: true});
+
+      assertWidgetExists(plain2, true);
+      assertWidgetExists(private2, true);
+
+      // Try moving the widget around and make sure it doesn't get added
+      // to the private windows. We'll start by appending it to the tabstrip.
+      CustomizableUI.addWidgetToArea(kWidgetId,
+                                     CustomizableUI.AREA_TABSTRIP);
+      assertWidgetExists(plain, true);
+      assertWidgetExists(plain2, true);
+      assertWidgetExists(private, true);
+      assertWidgetExists(private2, true);
+
+      // And then move it to the beginning of the tabstrip.
+      CustomizableUI.moveWidgetWithinArea(kWidgetId, 0);
+      assertWidgetExists(plain, true);
+      assertWidgetExists(plain2, true);
+      assertWidgetExists(private, true);
+      assertWidgetExists(private2, true);
+
+      CustomizableUI.removeWidgetFromArea("some-widget");
+      assertWidgetExists(plain, false);
+      assertWidgetExists(plain2, false);
+      assertWidgetExists(private, false);
+      assertWidgetExists(private2, false);
+
+      plain.close();
+      plain2.close();
+      private.close();
+      private2.close();
+
+      CustomizableUI.destroyWidget("some-widget");
+    },
+  }
+];
+
+function asyncCleanup() {
+  yield resetCustomization();
+}
+
+function test() {
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_886323_buildArea_removable_nodes.js

@@ -0,0 +1,56 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const kButtonId = "test-886323-removable-moved-node";
+const kLazyAreaId = "test-886323-lazy-area-for-removability-testing";
+
+let gNavBar = document.getElementById(CustomizableUI.AREA_NAVBAR);
+let gLazyArea;
+let gTests = [
+  {
+    desc: "Removable nodes shouldn't be moved by buildArea",
+    setup: function() {
+      let dummyBtn = createDummyXULButton(kButtonId, "Dummy");
+      dummyBtn.setAttribute("removable", "true");
+      gNavBar.customizationTarget.appendChild(dummyBtn);
+      let popupSet = document.getElementById("mainPopupSet");
+      gLazyArea = document.createElementNS(kNSXUL, "panel");
+      gLazyArea.id = kLazyAreaId;
+      gLazyArea.setAttribute("hidden", "true");
+      popupSet.appendChild(gLazyArea);
+      CustomizableUI.registerArea(kLazyAreaId, {
+        type: CustomizableUI.TYPE_MENU_PANEL,
+        defaultPlacements: []
+      });
+    },
+    run: function() {
+      CustomizableUI.addWidgetToArea(kButtonId, kLazyAreaId);
+      assertAreaPlacements(kLazyAreaId, [kButtonId],
+                           "Placements should have changed because widget is removable.");
+      let btn = document.getElementById(kButtonId);
+      btn.setAttribute("removable", "false");
+      gLazyArea.customizationTarget = gLazyArea;
+      CustomizableUI.registerToolbarNode(gLazyArea, []);
+      assertAreaPlacements(kLazyAreaId, [], "Placements should no longer include widget.");
+      is(btn.parentNode.id, gNavBar.customizationTarget.id,
+         "Button shouldn't actually have moved as it's not removable");
+    },
+    teardown: function() {
+      let btn = document.getElementById(kButtonId);
+      if (btn) btn.remove();
+      CustomizableUI.removeWidgetFromArea(kButtonId);
+      CustomizableUI.unregisterArea(kLazyAreaId);
+      gLazyArea.remove();
+    }
+  }
+];
+
+function asyncCleanup() {
+  yield resetCustomization();
+}
+
+function test() {
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_887438_currentset_shim.js

@@ -0,0 +1,84 @@
+/* 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/. */
+
+let navbar = document.getElementById("nav-bar")
+let navbarCT = navbar.customizationTarget;
+let overflowPanelList = document.getElementById("widget-overflow-list");
+let gTests = [
+  {
+    desc: "Reading currentset",
+    run: function() {
+      let nodeIds = [];
+      for (let node of navbarCT.childNodes) {
+        if (node.getAttribute("skipintoolbarset") != "true") {
+          nodeIds.push(node.id);
+        }
+      }
+      for (let node of overflowPanelList.childNodes) {
+        if (node.getAttribute("skipintoolbarset") != "true") {
+          nodeIds.push(node.id);
+        }
+      }
+      let currentSet = navbar.currentSet;
+      is(currentSet.split(',').length, nodeIds.length, "Should be just as many nodes as there are.");
+      is(currentSet, nodeIds.join(','), "Current set and node IDs should match.");
+    }
+  },
+  {
+    desc: "Insert, then remove items",
+    run: function() {
+      let currentSet = navbar.currentSet;
+      let newCurrentSet = currentSet.replace('home-button', 'feed-button,sync-button,home-button');
+      navbar.currentSet = newCurrentSet;
+      is(newCurrentSet, navbar.currentSet, "Current set should match expected current set.");
+      let feedBtn = document.getElementById("feed-button");
+      let syncBtn = document.getElementById("sync-button");
+      ok(feedBtn, "Feed button should have been added.");
+      ok(syncBtn, "Sync button should have been added.");
+      if (feedBtn && syncBtn) {
+        let feedParent = feedBtn.parentNode;
+        let syncParent = syncBtn.parentNode;
+        ok(feedParent == navbarCT || feedParent == overflowPanelList,
+           "Feed button should be in navbar or overflow");
+        ok(syncParent == navbarCT || syncParent == overflowPanelList,
+           "Feed button should be in navbar or overflow");
+        is(feedBtn.nextElementSibling, syncBtn, "Feed button should be next to sync button.");
+        let homeBtn = document.getElementById("home-button");
+        is(syncBtn.nextElementSibling, homeBtn, "Sync button should be next to home button.");
+      }
+      navbar.currentSet = currentSet;
+      is(currentSet, navbar.currentSet, "Should be able to remove the added items.");
+    }
+  },
+  {
+    desc: "Simultaneous insert/remove:",
+    run: function() {
+      let currentSet = navbar.currentSet;
+      let newCurrentSet = currentSet.replace('home-button', 'feed-button');
+      navbar.currentSet = newCurrentSet;
+      is(newCurrentSet, navbar.currentSet, "Current set should match expected current set.");
+      let feedBtn = document.getElementById("feed-button");
+      ok(feedBtn, "Feed button should have been added.");
+      let homeBtn = document.getElementById("home-button");
+      ok(!homeBtn, "Home button should have been removed.");
+      if (feedBtn) {
+        let feedParent = feedBtn.parentNode;
+        ok(feedParent == navbarCT || feedParent == overflowPanelList,
+           "Feed button should be in navbar or overflow");
+      }
+      navbar.currentSet = currentSet;
+      is(currentSet, navbar.currentSet, "Should be able to return to original state.");
+    }
+  }
+];
+
+function asyncCleanup() {
+  yield resetCustomization();
+}
+
+function test() {
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}
+

browser/components/customizableui/test/browser_888817_currentset_updating.js

@@ -0,0 +1,65 @@
+/* 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/. */
+
+let gTests = [
+  {
+    desc: "Adding, moving and removing items should update the relevant currentset attributes",
+    setup: function() {
+      let personalbar = document.getElementById(CustomizableUI.AREA_BOOKMARKS);
+      setToolbarVisibility(personalbar, true);
+    },
+    run: function() {
+      ok(CustomizableUI.inDefaultState, "Should be in the default state when we start");
+
+      let navbar = document.getElementById(CustomizableUI.AREA_NAVBAR);
+      let personalbar = document.getElementById(CustomizableUI.AREA_BOOKMARKS);
+      let navbarCurrentset = navbar.getAttribute("currentset") || navbar.currentSet;
+      let personalbarCurrentset = personalbar.getAttribute("currentset") || personalbar.currentSet;
+
+      let otherWin = yield openAndLoadWindow();
+      let otherNavbar = otherWin.document.getElementById(CustomizableUI.AREA_NAVBAR);
+      let otherPersonalbar = otherWin.document.getElementById(CustomizableUI.AREA_BOOKMARKS);
+
+      CustomizableUI.moveWidgetWithinArea("home-button", 0);
+      navbarCurrentset = "home-button," + navbarCurrentset.replace(",home-button", "");
+      is(navbar.getAttribute("currentset"), navbarCurrentset,
+         "Should have updated currentSet after move.");
+      is(otherNavbar.getAttribute("currentset"), navbarCurrentset,
+         "Should have updated other window's currentSet after move.");
+
+      CustomizableUI.addWidgetToArea("home-button", CustomizableUI.AREA_BOOKMARKS);
+      navbarCurrentset = navbarCurrentset.replace("home-button,", "");
+      personalbarCurrentset = personalbarCurrentset + ",home-button";
+      is(navbar.getAttribute("currentset"), navbarCurrentset,
+         "Should have updated navbar currentSet after implied remove.");
+      is(otherNavbar.getAttribute("currentset"), navbarCurrentset,
+         "Should have updated other window's navbar currentSet after implied remove.");
+      is(personalbar.getAttribute("currentset"), personalbarCurrentset,
+         "Should have updated personalbar currentSet after add.");
+      is(otherPersonalbar.getAttribute("currentset"), personalbarCurrentset,
+         "Should have updated other window's personalbar currentSet after add.");
+
+      CustomizableUI.removeWidgetFromArea("home-button");
+      personalbarCurrentset = personalbarCurrentset.replace(",home-button", "");
+      is(personalbar.getAttribute("currentset"), personalbarCurrentset,
+         "Should have updated currentSet after remove.");
+      is(otherPersonalbar.getAttribute("currentset"), personalbarCurrentset,
+         "Should have updated other window's currentSet after remove.");
+
+      otherWin.close();
+      // Reset in asyncCleanup will put our button back for us.
+    }
+  }
+];
+
+function asyncCleanup() {
+  let personalbar = document.getElementById(CustomizableUI.AREA_BOOKMARKS);
+  setToolbarVisibility(personalbar, false);
+  yield resetCustomization();
+}
+
+function test() {
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_890140_orphaned_placeholders.js

@@ -0,0 +1,135 @@
+/* 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/. */
+
+let gTests = [
+  {
+    desc: "One orphaned item should have two placeholders next to it.",
+    setup: startCustomizing,
+    run: function() {
+      let btn = document.getElementById("developer-button");
+      let panel = document.getElementById(CustomizableUI.AREA_PANEL);
+      let placements = getAreaWidgetIds(CustomizableUI.AREA_PANEL);
+
+      let placementsAfterAppend = placements.concat(["developer-button"]);
+      simulateItemDrag(btn, panel);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterAppend);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in default state.");
+      is(getVisiblePlaceholderCount(panel), 2, "Should only have 2 visible placeholders before exiting");
+
+      yield endCustomizing();
+      yield startCustomizing();
+      is(getVisiblePlaceholderCount(panel), 2, "Should only have 2 visible placeholders after re-entering");
+
+      let palette = document.getElementById("customization-palette");
+      simulateItemDrag(btn, palette);
+      ok(CustomizableUI.inDefaultState, "Should be in default state again.");
+    },
+  },
+  {
+    desc: "Two orphaned items should have one placeholder next to them (case 1).",
+    setup: startCustomizing,
+    run: function() {
+      let btn = document.getElementById("developer-button");
+      let panel = document.getElementById(CustomizableUI.AREA_PANEL);
+      let placements = getAreaWidgetIds(CustomizableUI.AREA_PANEL);
+
+      let placementsAfterAppend = placements.concat(["developer-button", "sync-button"]);
+      simulateItemDrag(btn, panel);
+      btn = document.getElementById("sync-button");
+      simulateItemDrag(btn, panel);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterAppend);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in default state.");
+      is(getVisiblePlaceholderCount(panel), 1, "Should only have 1 visible placeholders before exiting");
+
+      yield endCustomizing();
+      yield startCustomizing();
+      is(getVisiblePlaceholderCount(panel), 1, "Should only have 1 visible placeholders after re-entering");
+
+      let palette = document.getElementById("customization-palette");
+      simulateItemDrag(btn, palette);
+      btn = document.getElementById("developer-button");
+      simulateItemDrag(btn, palette);
+      ok(CustomizableUI.inDefaultState, "Should be in default state again.");
+    },
+  },
+  {
+    desc: "Two orphaned items should have one placeholder next to them (case 2).",
+    setup: startCustomizing,
+    run: function() {
+      let btn = document.getElementById("add-ons-button");
+      let panel = document.getElementById(CustomizableUI.AREA_PANEL);
+      let palette = document.getElementById("customization-palette");
+      let placements = getAreaWidgetIds(CustomizableUI.AREA_PANEL);
+
+      let placementsAfterAppend = placements.filter(p => p != btn.id);
+      simulateItemDrag(btn, palette);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterAppend);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in default state.");
+      is(getVisiblePlaceholderCount(panel), 1, "Should only have 1 visible placeholders before exiting");
+
+      yield endCustomizing();
+      yield startCustomizing();
+      is(getVisiblePlaceholderCount(panel), 1, "Should only have 1 visible placeholders after re-entering");
+
+      simulateItemDrag(btn, panel);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placements);
+      ok(CustomizableUI.inDefaultState, "Should be in default state again.");
+    },
+  },
+  {
+    desc: "A wide widget at the bottom of the panel should have three placeholders after it.",
+    setup: startCustomizing,
+    run: function() {
+      let btn = document.getElementById("edit-controls");
+      let panel = document.getElementById(CustomizableUI.AREA_PANEL);
+      let placements = getAreaWidgetIds(CustomizableUI.AREA_PANEL);
+
+      let placementsAfterAppend = placements.concat([placements.shift()]);
+      simulateItemDrag(btn, panel);
+      assertAreaPlacements(CustomizableUI.AREA_PANEL, placementsAfterAppend);
+      ok(!CustomizableUI.inDefaultState, "Should no longer be in default state.");
+      is(getVisiblePlaceholderCount(panel), 3, "Should have 3 visible placeholders before exiting");
+
+      yield endCustomizing();
+      yield startCustomizing();
+      is(getVisiblePlaceholderCount(panel), 3, "Should have 3 visible placeholders after re-entering");
+
+      let zoomControls = document.getElementById("zoom-controls");
+      simulateItemDrag(btn, zoomControls);
+      ok(CustomizableUI.inDefaultState, "Should be in default state again.");
+    },
+  },
+  {
+    desc: "The default placements should have three placeholders at the bottom.",
+    setup: startCustomizing,
+    run: function() {
+      let panel = document.getElementById(CustomizableUI.AREA_PANEL);
+      ok(CustomizableUI.inDefaultState, "Should be in default state.");
+      is(getVisiblePlaceholderCount(panel), 3, "Should have 3 visible placeholders before exiting");
+
+      yield endCustomizing();
+      yield startCustomizing();
+      is(getVisiblePlaceholderCount(panel), 3, "Should have 3 visible placeholders after re-entering");
+
+      ok(CustomizableUI.inDefaultState, "Should still be in default state.");
+    },
+  },
+];
+
+function asyncCleanup() {
+  yield endCustomizing();
+  Services.prefs.clearUserPref("browser.uiCustomization.skipSourceNodeCheck");
+  yield resetCustomization();
+}
+
+function test() {
+  Services.prefs.setBoolPref("browser.uiCustomization.skipSourceNodeCheck", true);
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}
+
+function getVisiblePlaceholderCount(aPanel) {
+  let visiblePlaceholders = aPanel.querySelectorAll(".panel-customization-placeholder:not([hidden=true])");
+  return visiblePlaceholders.length;
+}

browser/components/customizableui/test/browser_890262_destroyWidget_after_add_to_panel.js

@@ -0,0 +1,75 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const kLazyAreaId = "test-890262-lazy-area";
+const kWidget1Id  = "test-890262-widget1";
+const kWidget2Id  = "test-890262-widget2";
+
+let gTests = [
+  {
+    desc: "Destroying a widget after defaulting it to a non-legacy area should work.",
+    run: function() {
+      CustomizableUI.createWidget({
+        id: kWidget1Id,
+        removable: true,
+        defaultArea: kLazyAreaId
+      });
+      let noError = true;
+      try {
+        CustomizableUI.destroyWidget(kWidget1Id);
+      } catch (ex) {
+        Cu.reportError(ex);
+        noError = false;
+      }
+      ok(noError, "Shouldn't throw an exception for a widget that was created in a not-yet-constructed area");
+    }
+  },
+  {
+    desc: "Destroying a widget after moving it to a non-legacy area should work.",
+    run: function() {
+      CustomizableUI.createWidget({
+        id: kWidget2Id,
+        removable: true,
+        defaultArea: CustomizableUI.AREA_NAVBAR
+      });
+
+      CustomizableUI.addWidgetToArea(kWidget2Id, kLazyAreaId);
+      let noError = true;
+      try {
+        CustomizableUI.destroyWidget(kWidget2Id);
+      } catch (ex) {
+        Cu.reportError(ex);
+        noError = false;
+      }
+      ok(noError, "Shouldn't throw an exception for a widget that was added to a not-yet-constructed area");
+    }
+  }
+];
+
+function asyncCleanup() {
+  let lazyArea = document.getElementById(kLazyAreaId);
+  if (lazyArea) {
+    lazyArea.remove();
+  }
+  try {
+    CustomizableUI.unregisterArea(kLazyAreaId);
+  } catch (ex) {} // If we didn't register successfully for some reason
+  yield resetCustomization();
+}
+
+function setupArea() {
+  let lazyArea = document.createElementNS(kNSXUL, "hbox");
+  lazyArea.id = kLazyAreaId;
+  document.getElementById("nav-bar").appendChild(lazyArea);
+  CustomizableUI.registerArea(kLazyAreaId, {
+    type: CustomizableUI.TYPE_TOOLBAR,
+    defaultPlacements: []
+  });
+}
+
+function test() {
+  waitForExplicitFinish();
+  setupArea();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_892955_isWidgetRemovable_for_removed_widgets.js

@@ -0,0 +1,37 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const kWidgetId = "test-892955-remove-widget";
+
+let gTests = [
+  {
+    desc: "Removing a destroyed widget should work.",
+    run: function() {
+      let widgetSpec = {
+        id: kWidgetId,
+        defaultArea: CustomizableUI.AREA_NAVBAR
+      };
+
+      CustomizableUI.createWidget(widgetSpec);
+      CustomizableUI.destroyWidget(kWidgetId);
+      let noError = true;
+      try {
+        CustomizableUI.removeWidgetFromArea(kWidgetId);
+      } catch (ex) {
+        noError = false;
+        Cu.reportError(ex);
+      }
+      ok(noError, "Shouldn't throw an error removing a destroyed widget.");
+    }
+  }
+];
+
+function asyncCleanup() {
+  yield resetCustomization();
+}
+
+function test() {
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_892956_destroyWidget_defaultPlacements.js

@@ -0,0 +1,31 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const kWidgetId = "test-892956-destroyWidget-defaultPlacement";
+
+let gTests = [
+  {
+    desc: "destroyWidget should clean up defaultPlacements if the widget had a defaultArea",
+    run: function() {
+      ok(CustomizableUI.inDefaultState, "Should be in the default state when we start");
+
+      let widgetSpec = {
+        id: kWidgetId,
+        defaultArea: CustomizableUI.AREA_NAVBAR
+      };
+      CustomizableUI.createWidget(widgetSpec);
+      CustomizableUI.destroyWidget(kWidgetId);
+      ok(CustomizableUI.inDefaultState, "Should be in the default state when we finish");
+    }
+  }
+];
+
+function asyncCleanup() {
+  yield resetCustomization();
+}
+
+function test() {
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_909779_overflow_toolbars_new_window.js

@@ -0,0 +1,38 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+let gTests = [
+  {
+    desc: "Resize to a small window, open a new window, check that new window handles overflow properly",
+    run: function() {
+      let originalWindowWidth = window.outerWidth;
+      let navbar = document.getElementById(CustomizableUI.AREA_NAVBAR);
+      ok(!navbar.hasAttribute("overflowing"), "Should start with a non-overflowing toolbar.");
+      let oldChildCount = navbar.customizationTarget.childElementCount;
+      window.resizeTo(400, window.outerHeight);
+      yield waitForCondition(() => navbar.hasAttribute("overflowing"));
+      ok(navbar.hasAttribute("overflowing"), "Should have an overflowing toolbar.");
+
+      ok(navbar.customizationTarget.childElementCount < oldChildCount, "Should have fewer children.");
+      let newWindow = yield openAndLoadWindow();
+      let otherNavBar = newWindow.document.getElementById(CustomizableUI.AREA_NAVBAR);
+      yield waitForCondition(() => otherNavBar.hasAttribute("overflowing"));
+      ok(otherNavBar.hasAttribute("overflowing"), "Other window should have an overflowing toolbar.");
+      newWindow.close();
+
+      window.resizeTo(originalWindowWidth, window.outerHeight);
+      yield waitForCondition(() => !navbar.hasAttribute("overflowing"));
+      ok(!navbar.hasAttribute("overflowing"), "Should no longer have an overflowing toolbar.");
+    }
+  }
+];
+
+function asyncCleanup() {
+  yield resetCustomization();
+}
+
+function test() {
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_913972_currentset_overflow.js

@@ -0,0 +1,62 @@
+/* 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/. */
+
+let navbar = document.getElementById(CustomizableUI.AREA_NAVBAR);
+let gTests = [
+  {
+    desc: "Resize to a small window, resize back, shouldn't affect currentSet",
+    run: function() {
+      let originalWindowWidth = window.outerWidth;
+      let oldCurrentSet = navbar.currentSet;
+      ok(!navbar.hasAttribute("overflowing"), "Should start with a non-overflowing toolbar.");
+      ok(CustomizableUI.inDefaultState, "Should start in default state.");
+      let oldChildCount = navbar.customizationTarget.childElementCount;
+      window.resizeTo(400, window.outerHeight);
+      yield waitForCondition(() => navbar.hasAttribute("overflowing"));
+      ok(navbar.hasAttribute("overflowing"), "Should have an overflowing toolbar.");
+      is(navbar.currentSet, oldCurrentSet, "Currentset should be the same when overflowing.");
+      ok(CustomizableUI.inDefaultState, "Should still be in default state when overflowing.");
+      ok(navbar.customizationTarget.childElementCount < oldChildCount, "Should have fewer children.");
+      window.resizeTo(originalWindowWidth, window.outerHeight);
+      yield waitForCondition(() => !navbar.hasAttribute("overflowing"));
+      ok(!navbar.hasAttribute("overflowing"), "Should no longer have an overflowing toolbar.");
+      is(navbar.currentSet, oldCurrentSet, "Currentset should still be the same now we're no longer overflowing.");
+      ok(CustomizableUI.inDefaultState, "Should still be in default state now we're no longer overflowing.");
+
+      // Verify actual physical placements match those of the placement array:
+      let placementCounter = 0;
+      let placements = CustomizableUI.getWidgetIdsInArea(CustomizableUI.AREA_NAVBAR);
+      for (let node of navbar.customizationTarget.childNodes) {
+        if (node.getAttribute("skipintoolbarset") == "true") {
+          continue;
+        }
+        is(placements[placementCounter++], node.id, "Nodes should match after overflow");
+      }
+      is(placements.length, placementCounter, "Should have as many nodes as expected");
+      is(navbar.customizationTarget.childElementCount, oldChildCount, "Number of nodes should match");
+    }
+  },
+  {
+    desc: "Enter and exit customization mode, check that currentSet works",
+    run: function() {
+      let oldCurrentSet = navbar.currentSet;
+      ok(CustomizableUI.inDefaultState, "Should start in default state.");
+      yield startCustomizing();
+      ok(CustomizableUI.inDefaultState, "Should be in default state in customization mode.");
+      is(navbar.currentSet, oldCurrentSet, "Currentset should be the same in customization mode.");
+      yield endCustomizing();
+      ok(CustomizableUI.inDefaultState, "Should be in default state after customization mode.");
+      is(navbar.currentSet, oldCurrentSet, "Currentset should be the same after customization mode.");
+    }
+  }
+];
+
+function asyncCleanup() {
+  yield resetCustomization();
+}
+
+function test() {
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_914138_widget_API_overflowable_toolbar.js

@@ -0,0 +1,171 @@
+/* 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/. */
+
+let navbar = document.getElementById(CustomizableUI.AREA_NAVBAR);
+let overflowList = document.getElementById(navbar.getAttribute("overflowtarget"));
+
+const kTestBtn1 = "test-addWidgetToArea-overflow";
+const kTestBtn2 = "test-removeWidgetFromArea-overflow";
+const kHomeBtn = "home-button";
+const kDownloadsBtn = "downloads-button";
+const kSearchBox = "search-container";
+const kStarBtn = "bookmarks-menu-button";
+
+let originalWindowWidth;
+
+let gTests = [
+  {
+    desc: "Adding a widget should add it next to the widget it's being inserted next to.",
+    setup: function() {
+      originalWindowWidth = window.outerWidth;
+      createDummyXULButton(kTestBtn1, "Test");
+    },
+    run: function() {
+      ok(!navbar.hasAttribute("overflowing"), "Should start with a non-overflowing toolbar.");
+      ok(CustomizableUI.inDefaultState, "Should start in default state.");
+
+      window.resizeTo(400, window.outerHeight);
+      yield waitForCondition(() => navbar.hasAttribute("overflowing"));
+      ok(navbar.hasAttribute("overflowing"), "Should have an overflowing toolbar.");
+      ok(!navbar.querySelector("#" + kHomeBtn), "Home button should no longer be in the navbar");
+      ok(overflowList.querySelector("#" + kHomeBtn), "Home button should be overflowing");
+
+      let placementOfHomeButton = CustomizableUI.getWidgetIdsInArea(navbar.id).indexOf(kHomeBtn);
+      CustomizableUI.addWidgetToArea(kTestBtn1, navbar.id, placementOfHomeButton);
+      ok(!navbar.querySelector("#" + kTestBtn1), "New button should not be in the navbar");
+      ok(overflowList.querySelector("#" + kTestBtn1), "New button should be overflowing");
+      let nextEl = document.getElementById(kTestBtn1).nextSibling;
+      is(nextEl && nextEl.id, kHomeBtn, "Test button should be next to home button.");
+
+      window.resizeTo(originalWindowWidth, window.outerHeight);
+      yield waitForCondition(() => !navbar.hasAttribute("overflowing"));
+      ok(!navbar.hasAttribute("overflowing"), "Should not have an overflowing toolbar.");
+      ok(navbar.querySelector("#" + kHomeBtn), "Home button should be in the navbar");
+      ok(!overflowList.querySelector("#" + kHomeBtn), "Home button should no longer be overflowing");
+      ok(navbar.querySelector("#" + kTestBtn1), "Test button should be in the navbar");
+      ok(!overflowList.querySelector("#" + kTestBtn1), "Test button should no longer be overflowing");
+    },
+    teardown: function() {
+      let el = document.getElementById(kTestBtn1);
+      if (el) {
+        CustomizableUI.removeWidgetFromArea(kTestBtn1);
+        el.remove();
+      }
+      window.resizeTo(originalWindowWidth, window.outerHeight);
+    }
+  },
+  {
+    desc: "Removing a widget from the toolbar should try to move items back.",
+    setup: function() {
+      // This is pretty weird. We're going to try to move only the home button into the overlay:
+      let downloadsBtn = document.getElementById(kDownloadsBtn);
+      // Guarantee overflow of too much stuff:
+      window.resizeTo(700, window.outerHeight);
+      let inc = 15;
+      while (window.outerWidth < originalWindowWidth &&
+             downloadsBtn.parentNode != navbar.customizationTarget) {
+        window.resizeTo(window.outerWidth + inc, window.outerHeight);
+        yield waitFor(500);
+      }
+    },
+    run: function() {
+      ok(overflowList.querySelector("#home-button"), "Home button should be overflowing");
+      CustomizableUI.removeWidgetFromArea("downloads-button");
+      is(document.getElementById("home-button").parentNode, navbar.customizationTarget, "Home button should move back.");
+      ok(!navbar.hasAttribute("overflowing"), "Navbar is no longer overflowing");
+    },
+    teardown: function() {
+      window.resizeTo(originalWindowWidth, window.outerHeight);
+      yield waitForCondition(function() !navbar.hasAttribute("overflowing"));
+      CustomizableUI.reset();
+    }
+  },
+  {
+    desc: "Removing a widget should remove it from the overflow list if that is where it is, and update it accordingly.",
+    setup: function() {
+      createDummyXULButton(kTestBtn2, "Test");
+    },
+    run: function() {
+      ok(!navbar.hasAttribute("overflowing"), "Should start with a non-overflowing toolbar.");
+      ok(CustomizableUI.inDefaultState, "Should start in default state.");
+      CustomizableUI.addWidgetToArea(kTestBtn2, navbar.id);
+      ok(!navbar.hasAttribute("overflowing"), "Should still have a non-overflowing toolbar.");
+
+      window.resizeTo(400, window.outerHeight);
+      yield waitForCondition(() => navbar.hasAttribute("overflowing"));
+      ok(navbar.hasAttribute("overflowing"), "Should have an overflowing toolbar.");
+      ok(!navbar.querySelector("#" + kTestBtn2), "Test button should not be in the navbar");
+      ok(overflowList.querySelector("#" + kTestBtn2), "Test button should be overflowing");
+
+      CustomizableUI.removeWidgetFromArea(kTestBtn2);
+
+      ok(!overflowList.querySelector("#" + kTestBtn2), "Test button should not be overflowing.");
+      ok(!navbar.querySelector("#" + kTestBtn2), "Test button should not be in the navbar");
+      ok(gNavToolbox.palette.querySelector("#" + kTestBtn2), "Test button should be in the palette");
+
+      window.resizeTo(originalWindowWidth, window.outerHeight);
+      yield waitForCondition(() => !navbar.hasAttribute("overflowing"));
+      ok(!navbar.hasAttribute("overflowing"), "Should not have an overflowing toolbar.");
+    },
+    teardown: function() {
+      let el = document.getElementById(kTestBtn2);
+      if (el) {
+        CustomizableUI.removeWidgetFromArea(kTestBtn2);
+        el.remove();
+      }
+      window.resizeTo(originalWindowWidth, window.outerHeight);
+    }
+  },
+  {
+    desc: "Overflow everything that can, then reorganize that list",
+    setup: function() {
+      ok(!navbar.hasAttribute("overflowing"), "Should start with a non-overflowing toolbar.");
+      ok(CustomizableUI.inDefaultState, "Should start in default state.");
+
+      window.resizeTo(480, window.outerHeight);
+      yield waitForCondition(() => navbar.hasAttribute("overflowing"));
+      ok(!navbar.querySelector("#" + kSearchBox), "Search container should be overflowing");
+    },
+    run: function() {
+      let placements = CustomizableUI.getWidgetIdsInArea(navbar.id);
+      let searchboxPlacement = placements.indexOf(kSearchBox);
+      CustomizableUI.moveWidgetWithinArea(kHomeBtn, searchboxPlacement);
+      yield waitForCondition(() => navbar.querySelector("#" + kHomeBtn));
+      ok(navbar.querySelector("#" + kHomeBtn), "Home button should have moved back");
+      let inc = 15;
+      window.resizeTo(640, window.outerHeight);
+      while (window.outerWidth < originalWindowWidth &&
+             !navbar.querySelector("#" + kSearchBox)) {
+        window.resizeTo(window.outerWidth + inc, window.outerHeight);
+        yield waitFor(500);
+      }
+      ok(!navbar.querySelector("#" + kStarBtn), "Star button should still be overflowed");
+      CustomizableUI.moveWidgetWithinArea(kStarBtn);
+      let starButtonOverflowed = overflowList.querySelector("#" + kStarBtn);
+      ok(starButtonOverflowed && !starButtonOverflowed.nextSibling, "Star button should be last item");
+      window.resizeTo(window.outerWidth + 15, window.outerHeight);
+      yield waitForCondition(() => navbar.querySelector("#" + kDownloadsBtn) && navbar.hasAttribute("overflowing"));
+      ok(navbar.hasAttribute("overflowing"), "navbar should still be overflowing");
+      CustomizableUI.moveWidgetWithinArea(kHomeBtn);
+      let homeButtonOverflowed = overflowList.querySelector("#" + kHomeBtn);
+      ok(homeButtonOverflowed, "Home button should be in overflow list");
+      ok(navbar.hasAttribute("overflowing"), "navbar should still be overflowing");
+      ok(homeButtonOverflowed && !homeButtonOverflowed.nextSibling, "Home button should be last item");
+    },
+    teardown: function() {
+      window.resizeTo(originalWindowWidth, window.outerHeight);
+      yield waitForCondition(() => !navbar.hasAttribute("overflowing"));
+      ok(!navbar.hasAttribute("overflowing"), "Should not have an overflowing toolbar.");
+    }
+  }
+];
+
+function asyncCleanup() {
+  yield resetCustomization();
+}
+
+function test() {
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_914863_disabled_help_quit_buttons.js

@@ -0,0 +1,26 @@
+/* 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/. */
+
+let gTests = [
+  {
+    desc: "Entering then exiting customization mode should reenable the Help and Exit buttons.",
+    run: function() {
+      yield startCustomizing();
+      let helpButton = document.getElementById("PanelUI-help");
+      let quitButton = document.getElementById("PanelUI-quit");
+      ok(helpButton.getAttribute("disabled") == "true", "Help button should be disabled while in customization mode.");
+      ok(quitButton.getAttribute("disabled") == "true", "Quit button should be disabled while in customization mode.");
+      yield endCustomizing();
+
+      ok(!helpButton.hasAttribute("disabled"), "Help button should not be disabled.");
+      ok(!quitButton.hasAttribute("disabled"), "Quit button should not be disabled.");
+    }
+  },
+];
+
+function test() {
+  waitForExplicitFinish();
+  runTests(gTests);
+}
+

browser/components/customizableui/test/browser_918049_skipintoolbarset_dnd.js

@@ -0,0 +1,46 @@
+/* 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/. */
+
+let navbar;
+let skippedItem;
+let gTests = [
+  {
+    desc: "Attempting to drag a skipintoolbarset item should work.",
+    setup: function() {
+      navbar = document.getElementById("nav-bar");
+      skippedItem = document.createElement("toolbarbutton");
+      skippedItem.id = "test-skipintoolbarset-item";
+      skippedItem.setAttribute("label", "Test");
+      skippedItem.setAttribute("skipintoolbarset", "true");
+      navbar.customizationTarget.appendChild(skippedItem);
+    },
+    run: function() {
+      let downloadsButton = document.getElementById("downloads-button");
+      yield startCustomizing();
+      ok(CustomizableUI.inDefaultState, "Should still be in default state");
+      simulateItemDrag(skippedItem, downloadsButton);
+      ok(CustomizableUI.inDefaultState, "Should still be in default state");
+      let skippedItemWrapper = skippedItem.parentNode;
+      is(skippedItemWrapper.nextSibling && skippedItemWrapper.nextSibling.id,
+         downloadsButton.parentNode.id, "Should be next to downloads button");
+      simulateItemDrag(downloadsButton, skippedItem);
+      let downloadWrapper = downloadsButton.parentNode;
+      is(downloadWrapper.nextSibling && downloadWrapper.nextSibling.id,
+         skippedItem.parentNode.id, "Should be next to skipintoolbarset item");
+      ok(CustomizableUI.inDefaultState, "Should still be in default state");
+    }
+  },
+];
+function asyncCleanup() {
+  yield endCustomizing();
+  skippedItem.remove();
+  Services.prefs.clearUserPref("browser.uiCustomization.skipSourceNodeCheck");
+  yield resetCustomization();
+}
+
+function test() {
+  Services.prefs.setBoolPref("browser.uiCustomization.skipSourceNodeCheck", true);
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_923857_customize_mode_event_wrapping_during_reset.js

@@ -0,0 +1,38 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+let gTests = [
+  {
+    desc: "Customize mode reset button should revert correctly",
+    setup: function() {
+      yield startCustomizing();
+    },
+    run: function() {
+      let devButton = document.getElementById("developer-button");
+      let downloadsButton = document.getElementById("downloads-button");
+      let searchBox = document.getElementById("search-container");
+      let palette = document.getElementById("customization-palette");
+      ok(devButton && downloadsButton && searchBox && palette, "Stuff should exist");
+      simulateItemDrag(devButton, downloadsButton);
+      simulateItemDrag(searchBox, palette);
+      gCustomizeMode.reset();
+      yield waitForCondition(function() !gCustomizeMode.resetting);
+      ok(CustomizableUI.inDefaultState, "Should be back in default state");
+    },
+    teardown: function() {
+      yield endCustomizing();
+    }
+  }
+];
+
+function asyncCleanup() {
+  Services.prefs.clearUserPref("browser.uiCustomization.skipSourceNodeCheck");
+  yield resetCustomization();
+}
+
+function test() {
+  Services.prefs.setBoolPref("browser.uiCustomization.skipSourceNodeCheck", true);
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/browser_927717_customize_drag_empty_toolbar.js

@@ -0,0 +1,37 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const kTestToolbarId = "test-empty-drag";
+let gTests = [
+  {
+    desc: "Attempting to drag an item to an empty container should work.",
+    setup: function() {
+      createToolbarWithPlacements(kTestToolbarId, "");
+    },
+    run: function() {
+      yield startCustomizing();
+      let downloadButton = document.getElementById("downloads-button");
+      let customToolbar = document.getElementById(kTestToolbarId);
+      simulateItemDrag(downloadButton, customToolbar);
+      assertAreaPlacements(kTestToolbarId, ["downloads-button"]);
+      ok(downloadButton.parentNode && downloadButton.parentNode.parentNode == customToolbar,
+         "Button should really be in toolbar");
+    },
+    teardown: function() {
+      yield endCustomizing();
+      removeCustomToolbars();
+    }
+  },
+];
+function asyncCleanup() {
+  yield endCustomizing();
+  Services.prefs.clearUserPref("browser.uiCustomization.skipSourceNodeCheck");
+  yield resetCustomization();
+}
+
+function test() {
+  Services.prefs.setBoolPref("browser.uiCustomization.skipSourceNodeCheck", true);
+  waitForExplicitFinish();
+  runTests(gTests, asyncCleanup);
+}

browser/components/customizableui/test/head.js

@@ -0,0 +1,232 @@
+/* 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/. */
+
+
+// Avoid leaks by using tmp for imports...
+let tmp = {};
+Cu.import("resource://gre/modules/Promise.jsm", tmp);
+Cu.import("resource://gre/modules/Task.jsm", tmp);
+Cu.import("resource:///modules/CustomizableUI.jsm", tmp);
+let {Promise, Task, CustomizableUI} = tmp;
+
+let ChromeUtils = {};
+let scriptLoader = Cc["@mozilla.org/moz/jssubscript-loader;1"].getService(Ci.mozIJSSubScriptLoader);
+scriptLoader.loadSubScript("chrome://mochikit/content/tests/SimpleTest/ChromeUtils.js", ChromeUtils);
+
+let {synthesizeDragStart, synthesizeDrop} = ChromeUtils;
+
+const kNSXUL = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
+
+function createDummyXULButton(id, label) {
+  let btn = document.createElementNS(kNSXUL, "toolbarbutton");
+  btn.id = id;
+  btn.setAttribute("label", label || id);
+  btn.className = "toolbarbutton-1 chromeclass-toolbar-additional";
+  window.gNavToolbox.palette.appendChild(btn);
+  return btn;
+}
+
+let gAddedToolbars = new Set();
+
+function createToolbarWithPlacements(id, placements) {
+  gAddedToolbars.add(id);
+  let tb = document.createElementNS(kNSXUL, "toolbar");
+  tb.id = id;
+  tb.setAttribute("customizable", "true");
+  CustomizableUI.registerArea(id, {
+    type: CustomizableUI.TYPE_TOOLBAR,
+    defaultPlacements: placements
+  });
+  gNavToolbox.appendChild(tb);
+}
+
+function removeCustomToolbars() {
+  CustomizableUI.reset();
+  for (let toolbarId of gAddedToolbars) {
+    CustomizableUI.unregisterArea(toolbarId);
+    document.getElementById(toolbarId).remove();
+  }
+  gAddedToolbars.clear();
+}
+
+function resetCustomization() {
+  return CustomizableUI.reset();
+}
+
+function assertAreaPlacements(areaId, expectedPlacements) {
+  let actualPlacements = getAreaWidgetIds(areaId);
+  is(actualPlacements.length, expectedPlacements.length,
+     "Area " + areaId + " should have " + expectedPlacements.length + " items.");
+  let minItems = Math.min(expectedPlacements.length, actualPlacements.length);
+  for (let i = 0; i < minItems; i++) {
+    if (typeof expectedPlacements[i] == "string") {
+      is(actualPlacements[i], expectedPlacements[i],
+         "Item " + i + " in " + areaId + " should match expectations.");
+    } else if (expectedPlacements[i] instanceof RegExp) {
+      ok(expectedPlacements[i].test(actualPlacements[i]),
+         "Item " + i + " (" + actualPlacements[i] + ") in " +
+         areaId + " should match " + expectedPlacements[i]); 
+    } else {
+      ok(false, "Unknown type of expected placement passed to " +
+                " assertAreaPlacements. Is your test broken?");
+    }
+  }
+}
+
+function todoAssertAreaPlacements(areaId, expectedPlacements) {
+  let actualPlacements = getAreaWidgetIds(areaId);
+  let isPassing = actualPlacements.length == expectedPlacements.length;
+  let minItems = Math.min(expectedPlacements.length, actualPlacements.length);
+  for (let i = 0; i < minItems; i++) {
+    if (typeof expectedPlacements[i] == "string") {
+      isPassing = isPassing && actualPlacements[i] == expectedPlacements[i];
+    } else if (expectedPlacements[i] instanceof RegExp) {
+      isPassing = isPassing && expectedPlacements[i].test(actualPlacements[i]);
+    } else {
+      ok(false, "Unknown type of expected placement passed to " +
+                " assertAreaPlacements. Is your test broken?");
+    }
+  }
+  todo(isPassing, "The area placements for " + areaId +
+                  " should equal the expected placements.")
+}
+
+function getAreaWidgetIds(areaId) {
+  return CustomizableUI.getWidgetIdsInArea(areaId);
+}
+
+function simulateItemDrag(toDrag, target) {
+  let docId = toDrag.ownerDocument.documentElement.id;
+  let dragData = [[{type: 'text/toolbarwrapper-id/' + docId,
+                    data: toDrag.id}]];
+  synthesizeDragStart(toDrag.parentNode, dragData);
+  synthesizeDrop(target, target, dragData);
+}
+
+function endCustomizing() {
+  if (document.documentElement.getAttribute("customizing") != "true") {
+    return true;
+  }
+  let deferredEndCustomizing = Promise.defer();
+  function onCustomizationEnds() {
+    window.gNavToolbox.removeEventListener("aftercustomization", onCustomizationEnds);
+    deferredEndCustomizing.resolve();
+  }
+  window.gNavToolbox.addEventListener("aftercustomization", onCustomizationEnds);
+  window.gCustomizeMode.exit();
+
+  return deferredEndCustomizing.promise.then(function() {
+    let deferredLoadNewTab = Promise.defer();
+
+    //XXXgijs so some tests depend on this tab being about:blank. Make it so.
+    let newTabBrowser = window.gBrowser.selectedBrowser;
+    newTabBrowser.stop();
+
+    // If we stop early enough, this might actually be about:blank.
+    if (newTabBrowser.contentDocument.location.href == "about:blank") {
+      return;
+    }
+
+    // Otherwise, make it be about:blank, and wait for that to be done.
+    function onNewTabLoaded(e) {
+      newTabBrowser.removeEventListener("load", onNewTabLoaded, true);
+      deferredLoadNewTab.resolve();
+    }
+    newTabBrowser.addEventListener("load", onNewTabLoaded, true);
+    newTabBrowser.contentDocument.location.replace("about:blank");
+    return deferredLoadNewTab.promise;
+  });
+}
+
+function startCustomizing() {
+  if (document.documentElement.getAttribute("customizing") == "true") {
+    return;
+  }
+  let deferred = Promise.defer();
+  function onCustomizing() {
+    window.gNavToolbox.removeEventListener("customizationready", onCustomizing);
+    deferred.resolve();
+  }
+  window.gNavToolbox.addEventListener("customizationready", onCustomizing);
+  window.gCustomizeMode.enter();
+  return deferred.promise;
+}
+
+function openAndLoadWindow(aOptions, aWaitForDelayedStartup=false) {
+  let deferred = Promise.defer();
+  let win = OpenBrowserWindow(aOptions);
+  if (aWaitForDelayedStartup) {
+    Services.obs.addObserver(function onDS(aSubject, aTopic, aData) {
+      if (aSubject != win) {
+        return;
+      }
+      Services.obs.removeObserver(onDS, "browser-delayed-startup-finished");
+      deferred.resolve(win);
+    }, "browser-delayed-startup-finished", false);
+
+  } else {
+    win.addEventListener("load", function onLoad() {
+      win.removeEventListener("load", onLoad);
+      deferred.resolve(win);
+    });
+  }
+  return deferred.promise;
+}
+
+function waitForCondition(aConditionFn, aMaxTries=50, aCheckInterval=100) {
+  function tryNow() {
+    tries++;
+    if (aConditionFn()) {
+      deferred.resolve();
+    } else if (tries < aMaxTries) {
+      tryAgain();
+    } else {
+      deferred.reject("Condition timed out: " + aConditionFn.toSource());
+    }
+  }
+  function tryAgain() {
+    setTimeout(tryNow, aCheckInterval);
+  }
+  let deferred = Promise.defer();
+  let tries = 0;
+  tryAgain();
+  return deferred.promise;
+}
+
+function waitFor(aTimeout=100) {
+  let deferred = Promise.defer();
+  setTimeout(function() deferred.resolve(), aTimeout);
+  return deferred.promise;
+}
+
+function testRunner(testAry, asyncCleanup) {
+  Services.prefs.setBoolPref("browser.uiCustomization.disableAnimation", true);
+  for (let test of testAry) {
+    info(test.desc);
+
+    if (test.setup)
+      yield test.setup();
+
+    info("Running test");
+    yield test.run();
+    info("Cleanup");
+    if (test.teardown)
+      yield test.teardown();
+    ok(!document.getElementById(CustomizableUI.AREA_NAVBAR).hasAttribute("overflowing"), "Shouldn't overflow");
+  }
+  if (asyncCleanup) {
+    yield asyncCleanup();
+  }
+  ok(CustomizableUI.inDefaultState, "Should remain in default state");
+  Services.prefs.clearUserPref("browser.uiCustomization.disableAnimation");
+}
+
+function runTests(testAry, asyncCleanup) {
+  Task.spawn(testRunner(gTests, asyncCleanup)).then(finish, ex => {
+    // The stack of ok() here is misleading due to Promises. The stack of the
+    // actual exception is likely much more valuable, hence concatentating it.
+    ok(false, "Unexpected exception: " + ex + " With stack: " + ex.stack);
+    finish();
+  }).then(null, Cu.reportError);
+}

browser/components/downloads/content/downloads.js

@@ -646,11 +646,6 @@ const DownloadsOverlayLoader = {
       this._overlayLoading = false;
       this._loadedOverlays[aOverlay] = true;
 
-      // Loading the overlay causes all the persisted XUL attributes to be
-      // reapplied, including "iconsize" on the toolbars.  Until bug 640158 is
-      // fixed, we must recalculate the correct "iconsize" attributes manually.
-      retrieveToolbarIconsizesFromTheme();
-
       this.processPendingRequests();
     }
 

browser/components/downloads/content/indicator.js

@@ -119,10 +119,12 @@ const DownloadsButton = {
 
     indicator.open = this._anchorRequested;
 
-    // Determine if we're located on an invisible toolbar.
+    let widget = CustomizableUI.getWidget("downloads-button")
-    if (!isElementVisible(indicator.parentNode)) {
+                               .forWindow(window);
-      return null;
+     // Determine if the indicator is located on an invisible toolbar.
-    }
+     if (!isElementVisible(indicator.parentNode) && !widget.overflowed) {
+       return null;
+     }
 
     return DownloadsIndicatorView.indicatorAnchor;
   },
@@ -326,10 +328,20 @@ const DownloadsIndicatorView = {
       return;
     }
 
-    // If the anchor is not there or its container is hidden, don't show
-    // a notification
     let anchor = DownloadsButton._placeholder;
+    let widgetGroup = CustomizableUI.getWidget("downloads-button");
+    let widgetInWindow = widgetGroup.forWindow(window);
+    if (widgetInWindow.overflowed || widgetGroup.areaType == CustomizableUI.TYPE_MENU_PANEL) {
+      if (anchor && isElementVisible(anchor.parentNode)) {
+        // If the panel is open, don't do anything:
+        return;
+      }
+
+      // Otherwise, try to use the anchor of the panel:
+      anchor = widgetInWindow.anchor;
+    }
     if (!anchor || !isElementVisible(anchor.parentNode)) {
+      // Our container isn't visible, so can't show the animation:
       return;
     }
 
@@ -495,7 +507,13 @@ const DownloadsIndicatorView = {
       DownloadsCommon.getIndicatorData(window).attention = false;
       BrowserDownloadsUI();
     } else {
-      DownloadsPanel.showPanel();
+      // If the downloads button is in the menu panel, open the Library
+      let widgetGroup = CustomizableUI.getWidget("downloads-button");
+      if (widgetGroup.areaType == CustomizableUI.TYPE_MENU_PANEL) {
+        DownloadsPanel.showDownloadsHistory();
+      } else {
+        DownloadsPanel.showPanel();
+      }
     }
 
     aEvent.stopPropagation();
@@ -528,7 +546,6 @@ const DownloadsIndicatorView = {
   },
 
   _indicator: null,
-  _indicatorAnchor: null,
   __indicatorCounter: null,
   __indicatorProgress: null,
 
@@ -552,8 +569,12 @@ const DownloadsIndicatorView = {
 
   get indicatorAnchor()
   {
-    return this._indicatorAnchor ||
+    let widget = CustomizableUI.getWidget("downloads-button")
-      (this._indicatorAnchor = document.getElementById("downloads-indicator-anchor"));
+                               .forWindow(window);
+    if (widget.overflowed) {
+      return widget.anchor;
+    }
+    return document.getElementById("downloads-indicator-anchor");
   },
 
   get _indicatorCounter()
@@ -576,7 +597,6 @@ const DownloadsIndicatorView = {
 
   _onCustomizedAway: function() {
     this._indicator = null;
-    this._indicatorAnchor = null;
     this.__indicatorCounter = null;
     this.__indicatorProgress = null;
   },

browser/components/downloads/test/browser/browser.ini

@@ -3,3 +3,4 @@ support-files = head.js
 
 [browser_basic_functionality.js]
 [browser_first_download_panel.js]
+[browser_overflow_anchor.js]

browser/components/downloads/test/browser/browser_overflow_anchor.js

@@ -0,0 +1,115 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Make sure the downloads button and indicator overflows into the nav-bar
+ * chevron properly, and then when those buttons are clicked in the overflow
+ * panel that the downloads panel anchors to the chevron.
+ */
+function test_task() {
+  try {
+    // Ensure that state is reset in case previous tests didn't finish.
+    yield task_resetState();
+
+    // Record the original width of the window so we can put it back when
+    // this test finishes.
+    let oldWidth = window.outerWidth;
+
+    // The downloads button should not be overflowed to begin with.
+    let button = CustomizableUI.getWidget("downloads-button")
+                               .forWindow(window);
+    ok(!button.overflowed, "Downloads button should not be overflowed.");
+
+    // Hack - we lock the size of the default flex-y items in the nav-bar,
+    // namely, the URL and search inputs. That way we can resize the
+    // window without worrying about them flexing.
+    const kFlexyItems = ["urlbar-container", "search-container"];
+    registerCleanupFunction(() => unlockWidth(kFlexyItems));
+    lockWidth(kFlexyItems);
+
+    // Resize the window to half of its original size. That should
+    // be enough to overflow the downloads button.
+    window.resizeTo(oldWidth / 2, window.outerHeight);
+    yield waitForOverflowed(button, true);
+
+    let promise = promisePanelOpened();
+    button.node.doCommand();
+    yield promise;
+
+    let panel = DownloadsPanel.panel;
+    let chevron = document.getElementById("nav-bar-overflow-button");
+    is(panel.anchorNode, chevron, "Panel should be anchored to the chevron.");
+
+    DownloadsPanel.hidePanel();
+
+    // Unlock the widths on the flex-y items.
+    unlockWidth(kFlexyItems);
+
+    // Put the window back to its original dimensions.
+    window.resizeTo(oldWidth, window.outerHeight);
+
+    // The downloads button should eventually be un-overflowed.
+    yield waitForOverflowed(button, false);
+
+    // Now try opening the panel again.
+    promise = promisePanelOpened();
+    button.node.doCommand();
+    yield promise;
+
+    is(panel.anchorNode.id, "downloads-indicator-anchor");
+
+    DownloadsPanel.hidePanel();
+  } finally {
+    // Clean up when the test finishes.
+    yield task_resetState();
+  }
+}
+
+/**
+ * For some node IDs, finds the nodes and sets their min-width's to their
+ * current width, preventing them from flex-shrinking.
+ *
+ * @param aItemIDs an array of item IDs to set min-width on.
+ */
+function lockWidth(aItemIDs) {
+  for (let itemID of aItemIDs) {
+    let item = document.getElementById(itemID);
+    let curWidth = item.getBoundingClientRect().width + "px";
+    item.style.minWidth = curWidth;
+  }
+}
+
+/**
+ * Clears the min-width's set on a set of IDs by lockWidth.
+ *
+ * @param aItemIDs an array of ItemIDs to remove min-width on.
+ */
+function unlockWidth(aItemIDs) {
+  for (let itemID of aItemIDs) {
+    let item = document.getElementById(itemID);
+    item.style.minWidth = "";
+  }
+}
+
+/**
+ * Waits for a node to enter or exit the overflowed state.
+ *
+ * @param aItem the node to wait for.
+ * @param aIsOverflowed if we're waiting for the item to be overflowed.
+ */
+function waitForOverflowed(aItem, aIsOverflowed) {
+  let deferOverflow = Promise.defer();
+  if (aItem.overflowed == aIsOverflowed) {
+    return deferOverflow.resolve();
+  }
+
+  let observer = new MutationObserver(function(aMutations) {
+    if (aItem.overflowed == aIsOverflowed) {
+      observer.disconnect();
+      deferOverflow.resolve();
+    }
+  });
+  observer.observe(aItem.node, {attributes: true});
+
+  return deferOverflow.promise;
+}

browser/components/moz.build

@@ -7,6 +7,7 @@
 PARALLEL_DIRS += [
     'about',
     'certerror',
+    'customizableui',
     'dirprovider',
     'downloads',
     'feeds',

browser/components/nsBrowserGlue.js

@@ -1285,7 +1285,7 @@ BrowserGlue.prototype = {
   },
 
   _migrateUI: function BG__migrateUI() {
-    const UI_VERSION = 14;
+    const UI_VERSION = 17;
     const BROWSER_DOCURL = "chrome://browser/content/browser.xul#";
     let currentUIVersion = 0;
     try {
@@ -1479,6 +1479,60 @@ BrowserGlue.prototype = {
       OS.File.remove(path);
     }
 
+    if (currentUIVersion < 15) {
+      // Migrate users from text or text&icons mode to icons mode.
+      let updateToolbars = function (aToolbarIds, aResourceName, aResourceValue) {
+        let resource = this._rdf.GetResource(aResourceName);
+        for (toolbarId of aToolbarIds) {
+          let toolbar = this._rdf.GetResource(BROWSER_DOCURL + toolbarId);
+          let oldValue = this._getPersist(toolbar, resource);
+          if (oldValue && oldValue != aResourceValue) {
+            this._setPersist(toolbar, resource, aResourceValue);
+          }
+        }
+      }.bind(this);
+
+      updateToolbars(["navigator-toolbox", "nav-bar", "PersonalToolbar", "addon-bar"], "mode", "icons");
+      // Exclude PersonalToolbar and addon-bar since they have lockiconsize="true".
+      updateToolbars(["navigator-toolbox", "nav-bar"], "iconsize", "large");
+    }
+
+    if (currentUIVersion < 16) {
+      let toolbarResource = this._rdf.GetResource(BROWSER_DOCURL + "nav-bar");
+      let collapsedResource = this._rdf.GetResource("collapsed");
+      let isCollapsed = this._getPersist(toolbarResource, collapsedResource);
+      if (isCollapsed == "true") {
+        this._setPersist(toolbarResource, collapsedResource, "false");
+      }
+    }
+
+    // Insert the bookmarks-menu-button into the nav-bar if it isn't already
+    // there.
+    if (currentUIVersion < 17) {
+      let currentsetResource = this._rdf.GetResource("currentset");
+      let toolbarResource = this._rdf.GetResource(BROWSER_DOCURL + "nav-bar");
+      let currentset = this._getPersist(toolbarResource, currentsetResource);
+      // Need to migrate only if toolbar is customized.
+      if (currentset) {
+        if (!currentset.contains("bookmarks-menu-button")) {
+          // The button isn't in the nav-bar, so let's look for an appropriate
+          // place to put it.
+          if (currentset.contains("downloads-button")) {
+            currentset = currentset.replace(/(^|,)downloads-button($|,)/,
+                                            "$1bookmarks-menu-button,downloads-button$2");
+          } else if (currentset.contains("home-button")) {
+            currentset = currentset.replace(/(^|,)home-button($|,)/,
+                                            "$1bookmarks-menu-button,home-button$2");
+          } else {
+            // Just append.
+            currentset = currentset.replace(/(^|,)window-controls($|,)/,
+                                            "$1bookmarks-menu-button,window-controls$2")
+          }
+          this._setPersist(toolbarResource, currentsetResource, currentset);
+        }
+      }
+    }
+
     if (this._dirty)
       this._dataSource.QueryInterface(Ci.nsIRDFRemoteDataSource).Flush();
 

browser/components/places/content/browserPlacesViews.js

@@ -1745,3 +1745,157 @@ PlacesMenu.prototype = {
   }
 };
 
+function PlacesPanelMenuView(aPlace, aViewId, aRootId) {
+  this._viewElt = document.getElementById(aViewId);
+  this._rootElt = document.getElementById(aRootId);
+  this._viewElt._placesView = this;
+
+  PlacesViewBase.call(this, aPlace);
+}
+
+PlacesPanelMenuView.prototype = {
+  __proto__: PlacesViewBase.prototype,
+
+  QueryInterface: function PAMV_QueryInterface(aIID) {
+    return PlacesViewBase.prototype.QueryInterface.apply(this, arguments);
+  },
+
+  uninit: function PAMV_uninit() {
+    PlacesViewBase.prototype.uninit.apply(this, arguments);
+  },
+
+  _insertNewItem:
+  function PAMV__insertNewItem(aChild, aBefore) {
+    this._domNodes.delete(aChild);
+
+    let type = aChild.type;
+    let button;
+    if (type == Ci.nsINavHistoryResultNode.RESULT_TYPE_SEPARATOR) {
+      button = document.createElement("toolbarseparator");
+    }
+    else {
+      button = document.createElement("toolbarbutton");
+      button.className = "bookmark-item";
+      button.setAttribute("label", aChild.title);
+      let icon = aChild.icon;
+      if (icon)
+        button.setAttribute("image", icon);
+
+      if (PlacesUtils.containerTypes.indexOf(type) != -1) {
+        button.setAttribute("container", "true");
+
+        if (PlacesUtils.nodeIsQuery(aChild)) {
+          button.setAttribute("query", "true");
+          if (PlacesUtils.nodeIsTagQuery(aChild))
+            button.setAttribute("tagContainer", "true");
+        }
+        else if (PlacesUtils.nodeIsFolder(aChild)) {
+          PlacesUtils.livemarks.getLivemark(
+            { id: aChild.itemId },
+            function (aStatus, aLivemark) {
+              if (Components.isSuccessCode(aStatus)) {
+                button.setAttribute("livemark", "true");
+                this.controller.cacheLivemarkInfo(aChild, aLivemark);
+              }
+            }.bind(this)
+          );
+        }
+      }
+      else if (PlacesUtils.nodeIsURI(aChild)) {
+        button.setAttribute("scheme",
+                            PlacesUIUtils.guessUrlSchemeForUI(aChild.uri));
+      }
+    }
+
+    button._placesNode = aChild;
+    if (!this._domNodes.has(aChild))
+      this._domNodes.set(aChild, button);
+
+    this._rootElt.insertBefore(button, aBefore);
+  },
+
+  nodeInserted:
+  function PAMV_nodeInserted(aParentPlacesNode, aPlacesNode, aIndex) {
+    let parentElt = this._getDOMNodeForPlacesNode(aParentPlacesNode);
+    if (parentElt != this._rootElt)
+      return;
+
+    let children = this._rootElt.childNodes;
+    this._insertNewItem(aPlacesNode,
+      aIndex < children.length ? children[aIndex] : null);
+  },
+
+  nodeRemoved:
+  function PAMV_nodeRemoved(aParentPlacesNode, aPlacesNode, aIndex) {
+    let parentElt = this._getDOMNodeForPlacesNode(aParentPlacesNode);
+    if (parentElt != this._rootElt)
+      return;
+
+    let elt = this._getDOMNodeForPlacesNode(aPlacesNode);
+    this._removeChild(elt);
+  },
+
+  nodeMoved:
+  function PAMV_nodeMoved(aPlacesNode,
+                          aOldParentPlacesNode, aOldIndex,
+                          aNewParentPlacesNode, aNewIndex) {
+    let parentElt = this._getDOMNodeForPlacesNode(aNewParentPlacesNode);
+    if (parentElt != this._rootElt)
+      return;
+
+    let elt = this._getDOMNodeForPlacesNode(aPlacesNode);
+    this._removeChild(elt);
+    this._rootElt.insertBefore(elt, this._rootElt.childNodes[aNewIndex]);
+  },
+
+  nodeAnnotationChanged:
+  function PAMV_nodeAnnotationChanged(aPlacesNode, aAnno) {
+    let elt = this._getDOMNodeForPlacesNode(aPlacesNode);
+    // There's no UI representation for the root node.
+    if (elt == this._rootElt)
+      return;
+
+    if (elt.parentNode != this._rootElt)
+      return;
+
+    // All livemarks have a feedURI, so use it as our indicator.
+    if (aAnno == PlacesUtils.LMANNO_FEEDURI) {
+      elt.setAttribute("livemark", true);
+
+      PlacesUtils.livemarks.getLivemark(
+        { id: aPlacesNode.itemId },
+        function (aStatus, aLivemark) {
+          if (Components.isSuccessCode(aStatus)) {
+            this.controller.cacheLivemarkInfo(aPlacesNode, aLivemark);
+            this.invalidateContainer(aPlacesNode);
+          }
+        }.bind(this)
+      );
+    }
+  },
+
+  nodeTitleChanged: function PAMV_nodeTitleChanged(aPlacesNode, aNewTitle) {
+    let elt = this._getDOMNodeForPlacesNode(aPlacesNode);
+
+    // There's no UI representation for the root node.
+    if (elt == this._rootElt)
+      return;
+
+    PlacesViewBase.prototype.nodeTitleChanged.apply(this, arguments);
+  },
+
+  invalidateContainer: function PAMV_invalidateContainer(aPlacesNode) {
+    let elt = this._getDOMNodeForPlacesNode(aPlacesNode);
+    if (elt != this._rootElt)
+      return;
+
+    // Container is the toolbar itself.
+    while (this._rootElt.hasChildNodes()) {
+      this._rootElt.removeChild(this._rootElt.firstChild);
+    }
+
+    for (let i = 0; i < this._resultNode.childCount; ++i) {
+      this._insertNewItem(this._resultNode.getChild(i), null);
+    }
+  }
+};

browser/components/places/content/menu.xml

@@ -80,8 +80,8 @@
               elt = elt.parentNode;
 
             // Calculate positions taking care of arrowscrollbox
-            let eventY = aEvent.layerY;
             let scrollbox = this._scrollBox;
+            let eventY = aEvent.layerY + (scrollbox.boxObject.y - this.boxObject.y);
             let scrollboxOffset = scrollbox.scrollBoxObject.y -
                                   (scrollbox.boxObject.y - this.boxObject.y);
             let eltY = elt.boxObject.y - scrollboxOffset;
@@ -485,4 +485,121 @@
 
     </handlers>
   </binding>
+
+  <!-- Most of this is copied from the arrowpanel binding in popup.xml -->
+  <binding id="places-popup-arrow"
+           extends="chrome://browser/content/places/menu.xml#places-popup-base">
+    <content flip="both" side="top" position="bottomcenter topleft">
+      <xul:box anonid="container" class="panel-arrowcontainer" flex="1"
+               xbl:inherits="side,panelopen">
+        <xul:box anonid="arrowbox" class="panel-arrowbox">
+          <xul:image anonid="arrow" class="panel-arrow" xbl:inherits="side"/>
+        </xul:box>
+        <xul:box class="panel-arrowcontent" xbl:inherits="side,align,dir,orient,pack" flex="1">
+          <xul:vbox class="menupopup-drop-indicator-bar" hidden="true">
+            <xul:image class="menupopup-drop-indicator" mousethrough="always"/>
+          </xul:vbox>
+          <xul:arrowscrollbox class="popup-internal-box" flex="1" orient="vertical"
+                              smoothscroll="false">
+            <children/>
+          </xul:arrowscrollbox>
+        </xul:box>
+      </xul:box>
+    </content>
+
+    <implementation>
+      <method name="adjustArrowPosition">
+        <body><![CDATA[
+          var arrow = document.getAnonymousElementByAttribute(this, "anonid", "arrow");
+
+          var anchor = this.anchorNode;
+          if (!anchor) {
+            arrow.hidden = true;
+            return;
+          }
+
+          var container = document.getAnonymousElementByAttribute(this, "anonid", "container");
+          var arrowbox = document.getAnonymousElementByAttribute(this, "anonid", "arrowbox");
+
+          // if this panel has a "sliding" arrow, we may have previously set margins...
+          arrowbox.style.removeProperty("margin");
+
+          var position = this.alignmentPosition;
+          if (position.indexOf("start_") == 0 || position.indexOf("end_") == 0) {
+            container.orient = "";
+            arrowbox.orient = "vertical";
+            if (position.indexOf("_after") > 0) {
+              arrowbox.pack = "end";
+              arrowbox.style.marginBottom = this.alignmentOffset + "px";
+            } else {
+              arrowbox.pack = "start";
+              arrowbox.style.marginTop = this.alignmentOffset + "px";
+            }
+
+            // The assigned side stays the same regardless of direction.
+            var isRTL = (window.getComputedStyle(this).direction == "rtl");
+
+            if (position.indexOf("start_") == 0) {
+              container.dir = "reverse";
+              this.setAttribute("side", isRTL ? "left" : "right");
+            }
+            else {
+              container.dir = "";
+              this.setAttribute("side", isRTL ? "right" : "left");
+            }
+          }
+          else if (position.indexOf("before_") == 0 || position.indexOf("after_") == 0) {
+            container.orient = "vertical";
+            arrowbox.orient = "";
+            if (position.indexOf("_end") > 0) {
+              arrowbox.pack = "end";
+              arrowbox.style.marginRight = this.alignmentOffset + "px";
+            } else {
+              arrowbox.pack = "start";
+              arrowbox.style.marginLeft = this.alignmentOffset + "px";
+            }
+
+            if (position.indexOf("before_") == 0) {
+              container.dir = "reverse";
+              this.setAttribute("side", "bottom");
+            }
+            else {
+              container.dir = "";
+              this.setAttribute("side", "top");
+            }
+          }
+          arrow.hidden = false;
+        ]]></body>
+      </method>
+    </implementation>
+
+    <handlers>
+      <handler event="popupshowing" phase="target"><![CDATA[
+        this.adjustArrowPosition();
+      ]]></handler>
+      <handler event="popupshown" phase="target"><![CDATA[
+        this.setAttribute("panelopen", "true");
+
+        // Allow anchoring to a specified element inside the anchor.
+        var anchorClass = this.getAttribute("anonanchorclass");
+        if (anchorClass && this.anchorNode) {
+          let anchor =
+            document.getAnonymousElementByAttribute(this.anchorNode, "class",
+                                                    anchorClass);
+          if (anchor) {
+            let offsetX = anchor.boxObject.width / 2;
+            if (this.alignmentPosition.endsWith("_end"))
+              offsetX *= -1;
+            this.popupBoxObject.moveToAnchor(anchor, this.alignmentPosition,
+                                             offsetX, 0,
+                                             false);
+            this.adjustArrowPosition();
+          }
+        }
+      ]]></handler>
+      <handler event="popuphidden" phase="target"><![CDATA[
+        this.removeAttribute("panelopen");
+      ]]></handler>
+    </handlers>
+  </binding>
 </bindings>

browser/components/tabview/test/browser_tabview_bug626791.js

@@ -1,6 +1,9 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/ */
 
+Cu.import("resource:///modules/CustomizableUI.jsm");
+
+
 function test() {
   let cw;
   let win;
@@ -31,10 +34,7 @@ function test() {
     let pos = currentSet.indexOf(buttonId);
 
     if (-1 < pos) {
-      currentSet.splice(pos, 1);
+      CustomizableUI.removeWidgetFromArea("tabview-button");
-      toolbar.setAttribute("currentset", currentSet.join(","));
-      toolbar.currentSet = currentSet.join(",");
-      win.document.persist(toolbar.id, "currentset");
     }
   }
 

browser/locales/en-US/chrome/browser/browser.dtd

@@ -15,6 +15,9 @@
                                                                 inside the private browsing mode -->
 <!ENTITY mainWindow.titlePrivateBrowsingSuffix "(Private Browsing)">
 
+<!ENTITY appmenu.title                       "Customize and Control &brandFullName;">
+<!ENTITY navbarOverflow.label                "More tools…">
+
 <!-- Tab context menu -->
 <!ENTITY  reloadTab.label                    "Reload Tab">
 <!ENTITY  reloadTab.accesskey                "R">
@@ -159,10 +162,8 @@ These should match what Safari and other Apple applications use on OS X Lion. --
 <!ENTITY printButton.label            "Print">
 <!ENTITY printButton.tooltip          "Print this page">
 
-<!ENTITY backForwardItem.title        "Back/Forward">
 <!ENTITY locationItem.title           "Location">
 <!ENTITY searchItem.title             "Search">
-<!ENTITY bookmarksItem.title          "Bookmarks">
 
 <!-- Toolbar items --> 
 <!ENTITY homeButton.label             "Home">
@@ -176,7 +177,7 @@ These should match what Safari and other Apple applications use on OS X Lion. --
 <!ENTITY bookmarksMenuButton.label          "Bookmarks">
 <!ENTITY bookmarksMenuButton.tooltip        "Display your bookmarks">
 <!ENTITY bookmarksMenuButton.unsorted.label "Unsorted Bookmarks">
-<!ENTITY viewBookmarksSidebar.label         "Show in Sidebar">
+<!ENTITY viewBookmarksSidebar2.label        "View Bookmarks Sidebar">
 <!ENTITY viewBookmarksToolbar.label         "View Bookmarks Toolbar">
 
 <!-- LOCALIZATION NOTE (bookmarksSidebarGtkCmd.commandkey): This command
@@ -328,12 +329,29 @@ These should match what Safari and other Apple applications use on OS X Lion. --
 <!ENTITY showAllHistoryCmd.commandkey "H">
 
 <!ENTITY appMenuCustomize.label "Customize">
+<!ENTITY appMenuHistory.label "History">
+<!ENTITY appMenuHistory.showAll.label "Show All History">
+<!ENTITY appMenuHistory.clearRecent.label "Clear Recent History…">
+<!ENTITY appMenuHistory.restoreSession.label "Restore Previous Session">
+
+<!ENTITY customizeMenu.addToToolbar.label "Add to Toolbar">
+<!ENTITY customizeMenu.addToToolbar.accesskey "A">
+<!ENTITY customizeMenu.removeFromMenu.label "Remove from Menu">
+<!ENTITY customizeMenu.removeFromMenu.accesskey "R">
+<!ENTITY customizeMenu.addMoreItems.label "Add More Items…">
+<!ENTITY customizeMenu.addMoreItems.accesskey "A">
 
 <!ENTITY openCmd.commandkey           "l">
 <!ENTITY urlbar.placeholder2          "Search or enter address">
 <!ENTITY urlbar.accesskey             "d">
 <!ENTITY urlbar.switchToTab.label     "Switch to tab:">
 
+<!-- LOCALIZATION NOTE (toggleMenuPanelMac.key) ideally this should be the same as
+     toggleMenuPanel. However, the modifier is different on mac (cmd+shift rather than ctrl)
+     and so you may need to pick a different key to avoid conflicts with other shortcuts. -->
+<!ENTITY toggleMenuPanel.key          "m">
+<!ENTITY toggleMenuPanelMac.key       "m">
+
 <!-- 
   Comment duplicated from browser-sets.inc:
 
@@ -647,6 +665,13 @@ just addresses the organization to follow, e.g. "This site is run by " -->
 <!ENTITY social.learnMore.accesskey "l">
 <!ENTITY social.closeNotificationItem.label "Not Now">
 
+
+
+<!ENTITY customizeMode.tabTitle "Customize &brandShortName;">
+<!ENTITY customizeMode.menuAndToolbars.label "Menu and toolbars">
+<!ENTITY customizeMode.menuAndToolbars.header "More Tools to Add to the Menu and Toolbar">
+<!ENTITY customizeMode.restoreDefaults "Restore Defaults">
+
 <!ENTITY social.chatBar.commandkey "c">
 <!ENTITY social.chatBar.label "Focus chats">
 <!ENTITY social.chatBar.accesskey "c">
@@ -723,5 +748,8 @@ just addresses the organization to follow, e.g. "This site is run by " -->
 <!ENTITY zoomControls.label            "Zoom Controls">
 <!ENTITY addonBarCloseButton.tooltip   "Close Add-on Bar">
 <!ENTITY toggleAddonBarCmd.key         "/">
+<!ENTITY backForwardItem.title         "Back/Forward">
+<!ENTITY viewBookmarksSidebar.label    "Show in Sidebar">
+<!ENTITY bookmarksItem.title           "Bookmarks">
 <!-- end of strings to be removed post-Australis -->
 

browser/locales/en-US/chrome/browser/customizableui/customizableWidgets.properties

@@ -0,0 +1,76 @@
+# 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/.
+
+history-panelmenu.label = History
+# LOCALIZATION NOTE (history-panelmenu.tooltiptext): Use the unicode ellipsis char,
+# \u2026, or use "..." if \u2026 doesn't suit traditions in your locale.
+history-panelmenu.tooltiptext = History… (%S)
+
+privatebrowsing-button.label = New Private Window
+# LOCALIZATION NOTE(privatebrowsing-button.tooltiptext): %S is the keyboard shortcut
+privatebrowsing-button.tooltiptext = Open a new Private Browsing window (%S)
+
+save-page-button.label = Save Page
+# LOCALIZATION NOTE(save-page-button.tooltiptext): %S is the keyboard shortcut
+save-page-button.tooltiptext = Save this page (%S)
+
+find-button.label = Find
+# LOCALIZATION NOTE(find-button.tooltiptext): %S is the keyboard shortcut
+find-button.tooltiptext = Find in this page (%S)
+
+open-file-button.label = Open File
+# LOCALIZATION NOTE(open-file-button.tooltiptext): %S is the keyboard shortcut
+open-file-button.tooltiptext = Open file (%S)
+
+developer-button.label = Developer
+# LOCALIZATION NOTE(developer-button.tooltiptext): %S is the keyboard shortcut
+developer-button.tooltiptext = Web Developer Tools (%S)
+
+add-ons-button.label = Add-ons
+# LOCALIZATION NOTE(add-ons-button.tooltiptext): %S is the keyboard shortcut
+add-ons-button.tooltiptext = Add-ons Manager (%S)
+
+preferences-button.label = Preferences
+# LOCALIZATION NOTE (preferences-button.tooltiptext): Use the unicode ellipsis char,
+# \u2026, or use "..." if \u2026 doesn't suit traditions in your locale.
+preferences-button.tooltiptext = Preferences…
+# LOCALIZATION NOTE (preferences-button.labelWin): Windows-only label for Options
+preferences-button.labelWin = Options
+# LOCALIZATION NOTE (preferences-button.tooltipWin): Windows-only tooltip for Options
+preferences-button.tooltipWin = Options
+
+zoom-controls.label = Zoom Controls
+zoom-controls.tooltiptext = Zoom Controls
+
+zoom-out-button.label = Zoom out
+zoom-out-button.tooltiptext = Zoom out
+
+# LOCALIZATION NOTE(zoom-reset-button.label): %S is the current zoom level,
+# %% will be displayed as a single % character (% is commonly used to define
+# format specifiers, so it needs to be escaped).
+zoom-reset-button.label = %S%%
+zoom-reset-button.tooltiptext = Reset zoom level
+
+zoom-in-button.label = Zoom in
+zoom-in-button.tooltiptext = Zoom in
+
+edit-controls.label = Edit Controls
+edit-controls.tooltiptext = Edit Controls
+
+cut-button.label = Cut
+cut-button.tooltiptext = Cut
+
+copy-button.label = Copy
+copy-button.tooltiptext = Copy
+
+paste-button.label = Paste
+paste-button.tooltiptext = Paste
+
+# LOCALIZATION NOTE (feed-button.tooltiptext): Use the unicode ellipsis char,
+# \u2026, or use "..." if \u2026 doesn't suit traditions in your locale.
+feed-button.label = Subscribe
+feed-button.tooltiptext = Subscribe to this page…
+
+characterencoding-button.label = Character Encoding
+characterencoding-button.tooltiptext = Character encoding