Merge m-c to inbound. a=merge
authorRyan VanderMeulen <ryanvm@gmail.com>
Tue, 18 Jul 2017 13:00:03 -0400
changeset 418310 e95d76dbe6517d9d5a257588607917f93635c56a
parent 418309 944c576e7e20802c72946a0335986307bcd0f278 (current diff)
parent 418123 dece50457378ac4934afe9fb3c2a8054e8894588 (diff)
child 418311 092390ed4c628d13875ddf3f9412e3de2b29a98c
push id7566
push usermtabara@mozilla.com
push dateWed, 02 Aug 2017 08:25:16 +0000
treeherdermozilla-beta@86913f512c3c [default view] [failures only]
perfherder[talos] [build metrics] [platform microbench] (compared to previous push)
reviewersmerge
milestone56.0a1
first release with
nightly linux32
nightly linux64
nightly mac
nightly win32
nightly win64
last release without
nightly linux32
nightly linux64
nightly mac
nightly win32
nightly win64
Merge m-c to inbound. a=merge
browser/components/preferences/in-content-new/advanced.js
browser/components/preferences/in-content-new/advanced.xul
browser/components/preferences/in-content-new/applications.js
browser/components/preferences/in-content-new/applications.xul
browser/components/preferences/in-content-new/tests/browser_security.js
browser/extensions/activity-stream/test/functional/mochitest/browser_dummy_test.js
devtools/client/themes/new-webconsole.css
dom/base/FragmentOrElement.cpp
dom/canvas/CanvasRenderingContext2D.cpp
dom/media/CubebUtils.cpp
dom/media/android/AndroidMediaDecoder.cpp
dom/media/android/AndroidMediaDecoder.h
dom/media/android/AndroidMediaPluginHost.cpp
dom/media/android/AndroidMediaPluginHost.h
dom/media/android/AndroidMediaResourceServer.cpp
dom/media/android/AndroidMediaResourceServer.h
dom/media/android/MPAPI.h
dom/media/android/moz.build
layout/build/nsLayoutStatics.cpp
media/omx-plugin/OmxPlugin.cpp
media/omx-plugin/include/ics/I420ColorConverter.h
media/omx-plugin/include/ics/II420ColorConverter.h
media/omx-plugin/include/ics/README_MOZILLA
media/omx-plugin/include/ics/android/native_window.h
media/omx-plugin/include/ics/android/rect.h
media/omx-plugin/include/ics/binder/Binder.h
media/omx-plugin/include/ics/binder/IBinder.h
media/omx-plugin/include/ics/binder/IInterface.h
media/omx-plugin/include/ics/cutils/atomic.h
media/omx-plugin/include/ics/cutils/log.h
media/omx-plugin/include/ics/cutils/logd.h
media/omx-plugin/include/ics/cutils/native_handle.h
media/omx-plugin/include/ics/cutils/uio.h
media/omx-plugin/include/ics/drm/DrmManagerClient.h
media/omx-plugin/include/ics/drm/drm_framework_common.h
media/omx-plugin/include/ics/hardware/fb.h
media/omx-plugin/include/ics/hardware/gralloc.h
media/omx-plugin/include/ics/hardware/hardware.h
media/omx-plugin/include/ics/media/IOMX.h
media/omx-plugin/include/ics/media/stagefright/MediaBuffer.h
media/omx-plugin/include/ics/media/stagefright/MediaErrors.h
media/omx-plugin/include/ics/media/stagefright/MediaSource.h
media/omx-plugin/include/ics/media/stagefright/openmax/OMX_Core.h
media/omx-plugin/include/ics/media/stagefright/openmax/OMX_IVCommon.h
media/omx-plugin/include/ics/media/stagefright/openmax/OMX_Index.h
media/omx-plugin/include/ics/media/stagefright/openmax/OMX_Types.h
media/omx-plugin/include/ics/media/stagefright/openmax/OMX_Video.h
media/omx-plugin/include/ics/pixelflinger/format.h
media/omx-plugin/include/ics/pixelflinger/pixelflinger.h
media/omx-plugin/include/ics/stagefright/ColorConverter.h
media/omx-plugin/include/ics/stagefright/DataSource.h
media/omx-plugin/include/ics/stagefright/MediaExtractor.h
media/omx-plugin/include/ics/stagefright/MetaData.h
media/omx-plugin/include/ics/stagefright/OMXClient.h
media/omx-plugin/include/ics/stagefright/OMXCodec.h
media/omx-plugin/include/ics/system/graphics.h
media/omx-plugin/include/ics/system/window.h
media/omx-plugin/include/ics/ui/GraphicBuffer.h
media/omx-plugin/include/ics/ui/PixelFormat.h
media/omx-plugin/include/ics/ui/Point.h
media/omx-plugin/include/ics/ui/Rect.h
media/omx-plugin/include/ics/ui/android_native_buffer.h
media/omx-plugin/include/ics/ui/egl/android_natives.h
media/omx-plugin/include/ics/utils/Errors.h
media/omx-plugin/include/ics/utils/Flattenable.h
media/omx-plugin/include/ics/utils/KeyedVector.h
media/omx-plugin/include/ics/utils/List.h
media/omx-plugin/include/ics/utils/Log.h
media/omx-plugin/include/ics/utils/RefBase.h
media/omx-plugin/include/ics/utils/SharedBuffer.h
media/omx-plugin/include/ics/utils/SortedVector.h
media/omx-plugin/include/ics/utils/String16.h
media/omx-plugin/include/ics/utils/String8.h
media/omx-plugin/include/ics/utils/StrongPointer.h
media/omx-plugin/include/ics/utils/Timers.h
media/omx-plugin/include/ics/utils/TypeHelpers.h
media/omx-plugin/include/ics/utils/Unicode.h
media/omx-plugin/include/ics/utils/Vector.h
media/omx-plugin/include/ics/utils/VectorImpl.h
media/omx-plugin/include/ics/utils/threads.h
media/omx-plugin/kk/OmxPluginKitKat.cpp
media/omx-plugin/kk/moz.build
media/omx-plugin/lib/ics/libstagefright/libstagefright.cpp
media/omx-plugin/lib/ics/libstagefright/moz.build
media/omx-plugin/lib/ics/libutils/libutils.cpp
media/omx-plugin/lib/ics/libutils/moz.build
media/omx-plugin/lib/ics/libvideoeditorplayer/libvideoeditorplayer.cpp
media/omx-plugin/lib/ics/libvideoeditorplayer/moz.build
media/omx-plugin/moz.build
mobile/android/app/src/photon/res/drawable-hdpi/firefox_logo.png
mobile/android/app/src/photon/res/drawable-mdpi/firefox_logo.png
mobile/android/app/src/photon/res/drawable-xhdpi/firefox_logo.png
mobile/android/app/src/photon/res/drawable-xxhdpi/firefox_logo.png
mobile/android/app/src/photon/res/drawable-xxxhdpi/firefox_logo.png
toolkit/components/places/tests/browser/browser_bug248970.js
--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -975,16 +975,20 @@ pref("browser.zoom.full", true);
 pref("browser.zoom.siteSpecific", true);
 
 // Whether or not to update background tabs to the current zoom level.
 pref("browser.zoom.updateBackgroundTabs", true);
 
 // The breakpad report server to link to in about:crashes
 pref("breakpad.reportURL", "https://crash-stats.mozilla.com/report/index/");
 
+// URL for "Learn More" for DataCollection
+pref("toolkit.datacollection.infoURL",
+     "https://www.mozilla.org/legal/privacy/firefox.html");
+
 // URL for "Learn More" for Crash Reporter
 pref("toolkit.crashreporter.infoURL",
      "https://www.mozilla.org/legal/privacy/firefox.html#crash-reporter");
 
 // base URL for web-based support pages
 pref("app.support.baseURL", "https://support.mozilla.org/1/firefox/%VERSION%/%OS%/%LOCALE%/");
 
 // a11y conflicts with e10s support page
@@ -1271,17 +1275,21 @@ pref("browser.newtabpage.rows", 3);
 
 // number of columns of newtab grid
 pref("browser.newtabpage.columns", 5);
 
 // directory tiles download URL
 pref("browser.newtabpage.directory.source", "https://tiles.services.mozilla.com/v3/links/fetch/%LOCALE%/%CHANNEL%");
 
 // activates Activity Stream
+#ifdef NIGHTLY_BUILD
+pref("browser.newtabpage.activity-stream.enabled", true);
+#else
 pref("browser.newtabpage.activity-stream.enabled", false);
+#endif
 
 // Enable the DOM fullscreen API.
 pref("full-screen-api.enabled", true);
 
 // Startup Crash Tracking
 // number of startup crashes that can occur before starting into safe mode automatically
 // (this pref has no effect if more than 6 hours have passed since the last crash)
 pref("toolkit.startup.max_resumed_crashes", 3);
--- a/browser/base/content/aboutDialog-appUpdater.js
+++ b/browser/base/content/aboutDialog-appUpdater.js
@@ -181,24 +181,19 @@ appUpdater.prototype =
           let year = buildID.slice(0, 4);
           let month = buildID.slice(4, 6);
           let day = buildID.slice(6, 8);
           updateVersion += ` (${year}-${month}-${day})`;
         }
         button.label = this.bundle.formatStringFromName("update.downloadAndInstallButton.label", [updateVersion], 1);
         button.accessKey = this.bundle.GetStringFromName("update.downloadAndInstallButton.accesskey");
       }
-      this.updateDeck.selectedPanel = panel;
-      if (!document.commandDispatcher.focusedElement || // don't steal the focus
-          document.commandDispatcher.focusedElement.localName == "button") // except from the other buttons
-        button.focus();
+    }
 
-    } else {
-      this.updateDeck.selectedPanel = panel;
-    }
+    this.updateDeck.selectedPanel = panel;
   },
 
   /**
    * Check for updates
    */
   checkForUpdates() {
     // Clear prefs that could prevent a user from discovering available updates.
     if (Services.prefs.prefHasUserValue(PREF_APP_UPDATE_CANCELATIONS_OSX)) {
--- a/browser/base/content/browser-tabsintitlebar.js
+++ b/browser/base/content/browser-tabsintitlebar.js
@@ -173,17 +173,17 @@ var TabsInTitlebar = {
 
       // And get the height of what's in the titlebar:
       let titlebarContentHeight = rect(titlebarContent).height;
 
       // Begin setting CSS properties which will cause a reflow
 
       if (AppConstants.MOZ_PHOTON_THEME &&
           AppConstants.isPlatformAndVersionAtLeast("win", "10.0")) {
-        if (!menuHeight) {
+        if (!menuHeight && window.windowState == window.STATE_MAXIMIZED) {
           titlebarContentHeight = Math.max(titlebarContentHeight, fullTabsHeight);
           $("titlebar-buttonbox").style.height = titlebarContentHeight + "px";
         } else {
           $("titlebar-buttonbox").style.removeProperty("height");
         }
       }
 
       // If the menubar is around (menuHeight is non-zero), try to adjust
--- a/browser/base/content/test/alerts/browser_notification_open_settings.js
+++ b/browser/base/content/test/alerts/browser_notification_open_settings.js
@@ -3,37 +3,44 @@
 var notificationURL = "http://example.org/browser/browser/base/content/test/alerts/file_dom_notifications.html";
 
 add_task(async function test_settingsOpen_observer() {
   info("Opening a dummy tab so openPreferences=>switchToTabHavingURI doesn't use the blank tab.");
   await BrowserTestUtils.withNewTab({
     gBrowser,
     url: "about:robots"
   }, async function dummyTabTask(aBrowser) {
+    // Ensure preferences is loaded before removing the tab.
+    let syncPaneLoadedPromise = TestUtils.topicObserved("sync-pane-loaded", () => true);
+
     let tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, "about:preferences#privacy");
     info("simulate a notifications-open-settings notification");
     let uri = NetUtil.newURI("https://example.com");
     let principal = Services.scriptSecurityManager.createCodebasePrincipal(uri, {});
     Services.obs.notifyObservers(principal, "notifications-open-settings");
     let tab = await tabPromise;
     ok(tab, "The notification settings tab opened");
+    await syncPaneLoadedPromise;
     await BrowserTestUtils.removeTab(tab);
   });
 });
 
 add_task(async function test_settingsOpen_button() {
   let pm = Services.perms;
   info("Adding notification permission");
   pm.add(makeURI(notificationURL), "desktop-notification", pm.ALLOW_ACTION);
 
   try {
     await BrowserTestUtils.withNewTab({
       gBrowser,
       url: notificationURL
     }, async function tabTask(aBrowser) {
+      // Ensure preferences is loaded before removing the tab.
+      let syncPaneLoadedPromise = TestUtils.topicObserved("sync-pane-loaded", () => true);
+
       info("Waiting for notification");
       await openNotification(aBrowser, "showNotification2");
 
       let alertWindow = Services.wm.getMostRecentWindow("alert:alert");
       if (!alertWindow) {
         ok(true, "Notifications don't use XUL windows on all platforms.");
         await closeNotification(aBrowser);
         return;
@@ -43,16 +50,17 @@ add_task(async function test_settingsOpe
       let tabPromise = BrowserTestUtils.waitForNewTab(gBrowser, "about:preferences#privacy");
       let openSettingsMenuItem = alertWindow.document.getElementById("openSettingsMenuItem");
       openSettingsMenuItem.click();
 
       info("Waiting for notification settings tab");
       let tab = await tabPromise;
       ok(tab, "The notification settings tab opened");
 
+      await syncPaneLoadedPromise;
       await closePromise;
       await BrowserTestUtils.removeTab(tab);
     });
   } finally {
     info("Removing notification permission");
     pm.remove(makeURI(notificationURL), "desktop-notification");
   }
 });
--- a/browser/base/content/test/static/browser_all_files_referenced.js
+++ b/browser/base/content/test/static/browser_all_files_referenced.js
@@ -38,16 +38,20 @@ var whitelist = [
   {file: "chrome://pdf.js/locale/viewer.properties"},
 
   // security/manager/pki/resources/content/device_manager.js
   {file: "chrome://pippki/content/load_device.xul"},
 
   // Used by setting this url as a pref in about:config
   {file: "chrome://browser/content/newtab/alternativeDefaultSites.json"},
 
+  // Temporary whitelisted while WebPayments in construction
+  // See Bug 1381141
+  {file: "chrome://payments/content/paymentRequest.xhtml"},
+
   // Add-on compat
   {file: "chrome://browser/skin/devtools/common.css"},
   {file: "chrome://global/content/XPCNativeWrapper.js"},
   {file: "chrome://global/locale/brand.dtd"},
 
   // The l10n build system can't package string files only for some platforms.
   // See bug 1339424 for why this is hard to fix.
   {file: "chrome://global/locale/fallbackMenubar.properties",
--- a/browser/base/content/test/urlbar/browser_urlbarSearchSuggestions_opt-out.js
+++ b/browser/base/content/test/urlbar/browser_urlbarSearchSuggestions_opt-out.js
@@ -51,17 +51,17 @@ add_task(async function focus() {
   EventUtils.synthesizeKey("d", {});
   await promiseSearchComplete();
   Assert.ok(suggestionsPresent());
   assertVisible(true);
   assertFooterVisible(true);
 
   // Check the Change Options link.
   let changeOptionsLink = document.getElementById("search-suggestions-change-settings");
-  let prefsPromise = BrowserTestUtils.waitForLocationChange(gBrowser, "about:preferences#general-search");
+  let prefsPromise = BrowserTestUtils.waitForLocationChange(gBrowser, "about:preferences#search");
   changeOptionsLink.click();
   await prefsPromise;
   Assert.ok(!gURLBar.popup.popupOpen, "popup should be closed");
   // The preferences page does fancy stuff with focus, ensure to unload it.
   await BrowserTestUtils.loadURI(gBrowser.selectedBrowser, "about:blank");
 });
 
 add_task(async function new_tab() {
--- a/browser/base/content/urlbarBindings.xml
+++ b/browser/base/content/urlbarBindings.xml
@@ -1607,17 +1607,17 @@ file, You can obtain one at http://mozil
                      role="link"
 #ifdef XP_WIN
                      value="&urlbar.searchSuggestionsNotification.changeSettingsWin;"
                      accesskey="&urlbar.searchSuggestionsNotification.changeSettingsWin.accesskey;"
 #else
                      value="&urlbar.searchSuggestionsNotification.changeSettingsUnix;"
                      accesskey="&urlbar.searchSuggestionsNotification.changeSettingsUnix.accesskey;"
 #endif
-                     onclick="Preferences.get('browser.preferences.useOldOrganization') ? openPreferences('paneSearch') : openPreferences('general-search');"
+                     onclick="openPreferences('paneSearch');"
                      control="search-suggestions-change-settings"/>
         </xul:hbox>
       </xul:deck>
       <xul:richlistbox anonid="richlistbox" class="autocomplete-richlistbox"
                        flex="1"/>
       <xul:hbox anonid="footer">
         <children/>
         <xul:vbox anonid="one-off-search-buttons"
--- a/browser/components/customizableui/test/browser_880164_customization_context_menus.js
+++ b/browser/components/customizableui/test/browser_880164_customization_context_menus.js
@@ -38,18 +38,17 @@ add_task(async function home_button_cont
   await hiddenPromise;
 });
 
 // Right-click on an empty bit of tabstrip should
 // show a context menu without options to move it,
 // but with tab-specific options instead.
 add_task(async function tabstrip_context() {
   // ensure there are tabs to reload/bookmark:
-  let extraTab = gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser);
-  await promiseTabLoadEvent(extraTab, "http://example.com/");
+  let extraTab = await BrowserTestUtils.openNewForegroundTab(gBrowser, "http://example.com/");
   let contextMenu = document.getElementById("toolbar-context-menu");
   let shownPromise = popupShown(contextMenu);
   let tabstrip = document.getElementById("tabbrowser-tabs");
   let rect = tabstrip.getBoundingClientRect();
   EventUtils.synthesizeMouse(tabstrip, rect.width - 2, 2, {type: "contextmenu", button: 2 });
   await shownPromise;
 
   let closedTabsAvailable = SessionStore.getClosedTabCount(window) == 0;
@@ -68,17 +67,17 @@ add_task(async function tabstrip_context
     ["---"],
     [".viewCustomizeToolbar", true]
   );
   checkContextMenu(contextMenu, expectedEntries);
 
   let hiddenPromise = popupHidden(contextMenu);
   contextMenu.hidePopup();
   await hiddenPromise;
-  gBrowser.removeTab(extraTab);
+  await BrowserTestUtils.removeTab(extraTab);
 });
 
 // Right-click on an empty bit of extra toolbar should
 // show a context menu with moving options disabled,
 // and a toggle option for the extra toolbar
 add_task(async function empty_toolbar_context() {
   let contextMenu = document.getElementById("toolbar-context-menu");
   let shownPromise = popupShown(contextMenu);
--- a/browser/components/customizableui/test/browser_photon_customization_context_menus.js
+++ b/browser/components/customizableui/test/browser_photon_customization_context_menus.js
@@ -41,18 +41,17 @@ add_task(async function home_button_cont
   await hiddenPromise;
 });
 
 // Right-click on an empty bit of tabstrip should
 // show a context menu without options to move it,
 // but with tab-specific options instead.
 add_task(async function tabstrip_context() {
   // ensure there are tabs to reload/bookmark:
-  let extraTab = gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser);
-  await promiseTabLoadEvent(extraTab, "http://example.com/");
+  let extraTab = await BrowserTestUtils.openNewForegroundTab(gBrowser, "http://example.com/");
   let contextMenu = document.getElementById("toolbar-context-menu");
   let shownPromise = popupShown(contextMenu);
   let tabstrip = document.getElementById("tabbrowser-tabs");
   let rect = tabstrip.getBoundingClientRect();
   EventUtils.synthesizeMouse(tabstrip, rect.width - 2, 2, {type: "contextmenu", button: 2 });
   await shownPromise;
 
   let closedTabsAvailable = SessionStore.getClosedTabCount(window) == 0;
@@ -71,17 +70,17 @@ add_task(async function tabstrip_context
     ["---"],
     [".viewCustomizeToolbar", true]
   );
   checkContextMenu(contextMenu, expectedEntries);
 
   let hiddenPromise = popupHidden(contextMenu);
   contextMenu.hidePopup();
   await hiddenPromise;
-  gBrowser.removeTab(extraTab);
+  await BrowserTestUtils.removeTab(extraTab);
 });
 
 // Right-click on an empty bit of extra toolbar should
 // show a context menu with moving options disabled,
 // and a toggle option for the extra toolbar
 add_task(async function empty_toolbar_context() {
   let contextMenu = document.getElementById("toolbar-context-menu");
   let shownPromise = popupShown(contextMenu);
--- a/browser/components/extensions/ext-utils.js
+++ b/browser/components/extensions/ext-utils.js
@@ -627,16 +627,24 @@ class Window extends WindowBase {
 
     if (options.width !== null || options.height !== null) {
       let width = options.width !== null ? options.width : window.outerWidth;
       let height = options.height !== null ? options.height : window.outerHeight;
       window.resizeTo(width, height);
     }
   }
 
+  get title() {
+    return this.window.document.title;
+  }
+
+  setTitlePreface(titlePreface) {
+    this.window.document.documentElement.setAttribute("titlepreface", titlePreface);
+  }
+
   get focused() {
     return this.window.document.hasFocus();
   }
 
   get top() {
     return this.window.screenY;
   }
 
--- a/browser/components/extensions/ext-windows.js
+++ b/browser/components/extensions/ext-windows.js
@@ -184,16 +184,19 @@ this.windows = class extends ExtensionAP
             }
             if (allowScriptsToClose) {
               for (let {linkedBrowser} of window.gBrowser.tabs) {
                 onXULFrameLoaderCreated({target: linkedBrowser});
                 linkedBrowser.addEventListener( // eslint-disable-line mozilla/balanced-listeners
                                                "XULFrameLoaderCreated", onXULFrameLoaderCreated);
               }
             }
+            if (createData.titlePreface) {
+              win.setTitlePreface(createData.titlePreface);
+            }
             return win.convert({populate: true});
           });
         },
 
         update: function(windowId, updateInfo) {
           if (updateInfo.state !== null && updateInfo.state != "normal") {
             if (updateInfo.left !== null || updateInfo.top !== null ||
                 updateInfo.width !== null || updateInfo.height !== null) {
@@ -212,16 +215,21 @@ this.windows = class extends ExtensionAP
 
           if (updateInfo.drawAttention) {
             // Bug 1257497 - Firefox can't cancel attention actions.
             win.window.getAttention();
           }
 
           win.updateGeometry(updateInfo);
 
+          if (updateInfo.titlePreface) {
+            win.setTitlePreface(updateInfo.titlePreface);
+            win.window.gBrowser.updateTitlebar();
+          }
+
           // TODO: All the other properties, focused=false...
 
           return Promise.resolve(win.convert());
         },
 
         remove: function(windowId) {
           let window = windowTracker.getWindow(windowId, context);
           window.close();
--- a/browser/components/extensions/schemas/windows.json
+++ b/browser/components/extensions/schemas/windows.json
@@ -76,16 +76,21 @@
           "alwaysOnTop": {
             "type": "boolean",
             "description": "Whether the window is set to be always on top."
           },
           "sessionId": {
             "type": "string",
             "optional": true,
             "description": "The session ID used to uniquely identify a Window obtained from the $(ref:sessions) API."
+          },
+          "title": {
+            "type": "string",
+            "optional": true,
+            "description": "The title of the window. Read-only."
           }
         }
       },
       {
         "id": "CreateType",
         "type": "string",
         "description": "Specifies what type of browser window to create. The 'panel' and 'detached_panel' types create a popup unless the '--enable-panels' flag is set.",
         "enum": ["normal", "popup", "panel", "detached_panel"]
@@ -329,16 +334,21 @@
                 "$ref": "WindowState",
                 "optional": true,
                 "description": "The initial state of the window. The 'minimized', 'maximized' and 'fullscreen' states cannot be combined with 'left', 'top', 'width' or 'height'."
               },
               "allowScriptsToClose": {
                 "type": "boolean",
                 "optional": true,
                 "description": "Allow scripts to close the window."
+              },
+              "titlePreface": {
+                "type": "string",
+                "optional": true,
+                "description": "A string to add to the beginning of the window title."
               }
             },
             "optional": true
           },
           {
             "type": "function",
             "name": "callback",
             "optional": true,
@@ -399,16 +409,21 @@
                 "type": "boolean",
                 "optional": true,
                 "description": "If true, causes the window to be displayed in a manner that draws the user's attention to the window, without changing the focused window. The effect lasts until the user changes focus to the window. This option has no effect if the window already has focus. Set to false to cancel a previous draw attention request."
               },
               "state": {
                 "$ref": "WindowState",
                 "optional": true,
                 "description": "The new state of the window. The 'minimized', 'maximized' and 'fullscreen' states cannot be combined with 'left', 'top', 'width' or 'height'."
+              },
+              "titlePreface": {
+                "type": "string",
+                "optional": true,
+                "description": "A string to add to the beginning of the window title."
               }
             }
           },
           {
             "type": "function",
             "name": "callback",
             "optional": true,
             "parameters": [
--- a/browser/components/extensions/test/browser/browser-common.ini
+++ b/browser/components/extensions/test/browser/browser-common.ini
@@ -14,16 +14,17 @@ support-files =
   file_popup_api_injection_b.html
   file_iframe_document.html
   file_iframe_document.sjs
   file_bypass_cache.sjs
   file_language_fr_en.html
   file_language_ja.html
   file_language_tlh.html
   file_dummy.html
+  file_title.html
   file_inspectedwindow_reload_target.sjs
   file_serviceWorker.html
   webNav_createdTarget.html
   webNav_createdTargetSource.html
   webNav_createdTargetSource_subframe.html
   serviceWorker.js
   searchSuggestionEngine.xml
   searchSuggestionEngine.sjs
--- a/browser/components/extensions/test/browser/browser_ext_windows.js
+++ b/browser/components/extensions/test/browser/browser_ext_windows.js
@@ -27,16 +27,123 @@ add_task(async function testWindowGetAll
 
   await extension.startup();
   await extension.awaitFinish("alwaysOnTop");
   await extension.unload();
 
   await BrowserTestUtils.closeWindow(raisedWin);
 });
 
+add_task(async function testWindowTitle() {
+  const PREFACE1 = "My prefix1 - ";
+  const PREFACE2 = "My prefix2 - ";
+  const START_URL = "http://example.com/browser/browser/components/extensions/test/browser/file_dummy.html";
+  const START_TITLE = "Dummy test page";
+  const NEW_URL = "http://example.com/browser/browser/components/extensions/test/browser/file_title.html";
+  const NEW_TITLE = "Different title test page";
+
+  async function background() {
+    browser.test.onMessage.addListener(async (msg, options, windowId, expected) => {
+      if (msg === "create") {
+        let win = await browser.windows.create(options);
+        browser.test.sendMessage("created", win);
+      }
+      if (msg === "update") {
+        let win = await browser.windows.get(windowId);
+        browser.test.assertTrue(win.title.startsWith(expected.before.preface),
+                              "Window has the expected title preface before update.");
+        browser.test.assertTrue(win.title.includes(expected.before.text),
+                              "Window has the expected title text before update.");
+        win = await browser.windows.update(windowId, options);
+        browser.test.assertTrue(win.title.startsWith(expected.after.preface),
+                              "Window has the expected title preface after update.");
+        browser.test.assertTrue(win.title.includes(expected.after.text),
+                              "Window has the expected title text after update.");
+        browser.test.sendMessage("updated", win);
+      }
+    });
+  }
+
+  let extension = ExtensionTestUtils.loadExtension({
+    background,
+  });
+
+  await extension.startup();
+  let {Management: {global: {windowTracker}}} = Cu.import("resource://gre/modules/Extension.jsm", {});
+
+  async function createApiWin(options) {
+    let promiseLoaded = BrowserTestUtils.waitForNewWindow(true, START_URL);
+    extension.sendMessage("create", options);
+    let apiWin = await extension.awaitMessage("created");
+    let realWin = windowTracker.getWindow(apiWin.id);
+    await promiseLoaded;
+    let expectedPreface = options.titlePreface ? options.titlePreface : "";
+    ok(realWin.document.title.startsWith(expectedPreface),
+       "Created window has the expected title preface.");
+    ok(realWin.document.title.includes(START_TITLE),
+       "Created window has the expected title text.");
+    return apiWin;
+  }
+
+  async function updateWindow(options, apiWin, expected) {
+    extension.sendMessage("update", options, apiWin.id, expected);
+    await extension.awaitMessage("updated");
+    let realWin = windowTracker.getWindow(apiWin.id);
+    ok(realWin.document.title.startsWith(expected.after.preface),
+       "Updated window has the expected title preface.");
+    ok(realWin.document.title.includes(expected.after.text),
+       "Updated window has the expected title text.");
+    await BrowserTestUtils.closeWindow(realWin);
+  }
+
+  // Create a window without a preface.
+  let apiWin = await createApiWin({url: START_URL});
+
+  // Add a titlePreface to the window.
+  let expected = {
+    before: {
+      preface: "",
+      text: START_TITLE,
+    },
+    after: {
+      preface: PREFACE1,
+      text: START_TITLE,
+    },
+  };
+  await updateWindow({titlePreface: PREFACE1}, apiWin, expected);
+
+  // Create a window with a preface.
+  apiWin = await createApiWin({url: START_URL, titlePreface: PREFACE1});
+
+  // Navigate to a different url and check that title is reflected.
+  let realWin = windowTracker.getWindow(apiWin.id);
+  let promiseLoaded = BrowserTestUtils.browserLoaded(realWin.gBrowser.selectedBrowser);
+  await BrowserTestUtils.loadURI(realWin.gBrowser.selectedBrowser, NEW_URL);
+  await promiseLoaded;
+  ok(realWin.document.title.startsWith(PREFACE1),
+     "Updated window has the expected title preface.");
+  ok(realWin.document.title.includes(NEW_TITLE),
+     "Updated window has the expected title text.");
+
+  // Update the titlePreface of the window.
+  expected = {
+    before: {
+      preface: PREFACE1,
+      text: NEW_TITLE,
+    },
+    after: {
+      preface: PREFACE2,
+      text: NEW_TITLE,
+    },
+  };
+  await updateWindow({titlePreface: PREFACE2}, apiWin, expected);
+
+  await extension.unload();
+});
+
 add_task(async function testInvalidWindowId() {
   let extension = ExtensionTestUtils.loadExtension({
     async background() {
       await browser.test.assertRejects(
         // Assuming that this windowId does not exist.
         browser.windows.get(123456789),
         /Invalid window/,
         "Should receive invalid window");
new file mode 100644
--- /dev/null
+++ b/browser/components/extensions/test/browser/file_title.html
@@ -0,0 +1,9 @@
+<html>
+<head>
+<title>Different title test page</title>
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8"></meta>
+</head>
+<body>
+<p>A page with a different title</p>
+</body>
+</html>
--- a/browser/components/extensions/test/xpcshell/test_ext_bookmarks.js
+++ b/browser/components/extensions/test/xpcshell/test_ext_bookmarks.js
@@ -107,17 +107,17 @@ add_task(async function test_bookmarks()
     });
 
     browser.bookmarks.onRemoved.addListener((id, info) => {
       collectedEvents.push({event: "onRemoved", id, info});
     });
 
     browser.bookmarks.get(["not-a-bookmark-guid"]).then(expectedError, invalidGuidError => {
       browser.test.assertTrue(
-        invalidGuidError.message.includes("Invalid value for property 'guid': not-a-bookmark-guid"),
+        invalidGuidError.message.includes("Invalid value for property 'guid': \"not-a-bookmark-guid\""),
         "Expected error thrown when trying to get a bookmark using an invalid guid"
       );
 
       return browser.bookmarks.get([nonExistentId]).then(expectedError, nonExistentIdError => {
         browser.test.assertTrue(
           nonExistentIdError.message.includes("Bookmark not found"),
           "Expected error thrown when trying to get a bookmark using a non-existent Id"
         );
--- a/browser/components/preferences/applicationManager.js
+++ b/browser/components/preferences/applicationManager.js
@@ -7,41 +7,51 @@
 var Cc = Components.classes;
 var Ci = Components.interfaces;
 
 var gAppManagerDialog = {
   _removed: [],
 
   init: function appManager_init() {
     this.handlerInfo = window.arguments[0];
-
+    // The applicationManager will be used
+    // in in-content's gApplicationsPane and in-content-new's gMainPane.
+    // Remove this once we use the in-content-new preferences page.
+    var pane;
+    if (Services.prefs.getBoolPref("browser.preferences.useOldOrganization")) {
+      Services.scriptloader.loadSubScript("chrome://browser/content/preferences/in-content/applications.js");
+      pane = gApplicationsPane;
+    } else {
+      Services.scriptloader.loadSubScript("chrome://browser/content/preferences/in-content-new/main.js");
+      pane = gMainPane;
+    }
     var bundle = document.getElementById("appManagerBundle");
     var contentText;
     if (this.handlerInfo.type == TYPE_MAYBE_FEED)
       contentText = bundle.getString("handleWebFeeds");
     else {
-      var description = gApplicationsPane._describeType(this.handlerInfo);
+      var description = pane._describeType(this.handlerInfo);
       var key =
         (this.handlerInfo.wrappedHandlerInfo instanceof Ci.nsIMIMEInfo) ? "handleFile"
                                                                         : "handleProtocol";
         contentText = bundle.getFormattedString(key, [description]);
     }
     contentText = bundle.getFormattedString("descriptionApplications", [contentText]);
     document.getElementById("appDescription").textContent = contentText;
 
     var list = document.getElementById("appList");
     var apps = this.handlerInfo.possibleApplicationHandlers.enumerate();
     while (apps.hasMoreElements()) {
       let app = apps.getNext();
-      if (!gApplicationsPane.isValidHandlerApp(app))
+      if (!pane.isValidHandlerApp(app))
         continue;
 
       app.QueryInterface(Ci.nsIHandlerApp);
       var item = list.appendItem(app.name);
-      item.setAttribute("image", gApplicationsPane._getIconURLForHandlerApp(app));
+      item.setAttribute("image", pane._getIconURLForHandlerApp(app));
       item.className = "listitem-iconic";
       item.app = app;
     }
 
     list.selectedIndex = 0;
   },
 
   onOK: function appManager_onOK() {
--- a/browser/components/preferences/applicationManager.xul
+++ b/browser/components/preferences/applicationManager.xul
@@ -16,18 +16,16 @@
         title="&appManager.title;"
         style="&appManager.style;"
         persist="screenX screenY">
 
   <script type="application/javascript"
           src="chrome://browser/content/utilityOverlay.js"/>
   <script type="application/javascript"
           src="chrome://browser/content/preferences/applicationManager.js"/>
-  <script type="application/javascript"
-          src="chrome://browser/content/preferences/in-content-new/applications.js"/>
 
   <commandset id="appManagerCommandSet">
     <command id="cmd_remove"
              oncommand="gAppManagerDialog.remove();"
              disabled="true"/>
   </commandset>
 
   <keyset id="appManagerKeyset">
--- a/browser/components/preferences/handlers.xml
+++ b/browser/components/preferences/handlers.xml
@@ -51,26 +51,32 @@
         <xul:hbox flex="1" align="center" xbl:inherits="tooltiptext=typeDescription">
           <xul:image src="moz-icon://goat?size=16" class="typeIcon"
                      xbl:inherits="src=typeIcon" height="16" width="16"/>
           <xul:label flex="1" crop="end" xbl:inherits="value=typeDescription"/>
         </xul:hbox>
         <xul:hbox flex="1">
           <xul:menulist class="actionsMenu" flex="1" crop="end" selectedIndex="1"
                         xbl:inherits="tooltiptext=actionDescription"
-                        oncommand="gApplicationsPane.onSelectAction(event.originalTarget)">
+                        oncommand="Services.prefs.getBoolPref('browser.preferences.useOldOrganization') ?
+                          gApplicationsPane.onSelectAction(event.originalTarget) :
+                          gMainPane.onSelectAction(event.originalTarget)">
             <xul:menupopup/>
           </xul:menulist>
         </xul:hbox>
       </xul:hbox>
     </content>
 
     <implementation>
       <constructor>
-        gApplicationsPane.rebuildActionsMenu();
+        if (Services.prefs.getBoolPref("browser.preferences.useOldOrganization")) {
+          gApplicationsPane.rebuildActionsMenu();
+        } else {
+          gMainPane.rebuildActionsMenu();
+        }
       </constructor>
     </implementation>
 
   </binding>
 
   <binding id="container">
     <content>
       <xul:hbox flex="1" equalsize="always">
deleted file mode 100644
--- a/browser/components/preferences/in-content-new/advanced.js
+++ /dev/null
@@ -1,202 +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/. */
-
-/* import-globals-from preferences.js */
-/* import-globals-from ../../../base/content/aboutDialog-appUpdater.js */
-
-// Load DownloadUtils module for convertByteUnits
-Components.utils.import("resource://gre/modules/DownloadUtils.jsm");
-Components.utils.import("resource://gre/modules/LoadContextInfo.jsm");
-Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
-
-var gAdvancedPane = {
-  _inited: false,
-
-  init() {
-    function setEventListener(aId, aEventType, aCallback) {
-      document.getElementById(aId)
-              .addEventListener(aEventType, aCallback.bind(gAdvancedPane));
-    }
-
-    this._inited = true;
-
-    let version = AppConstants.MOZ_APP_VERSION_DISPLAY;
-
-    // Include the build ID if this is an "a#" (nightly) build
-    if (/a\d+$/.test(version)) {
-      let buildID = Services.appinfo.appBuildID;
-      let year = buildID.slice(0, 4);
-      let month = buildID.slice(4, 6);
-      let day = buildID.slice(6, 8);
-      version += ` (${year}-${month}-${day})`;
-    }
-
-    // Append "(32-bit)" or "(64-bit)" build architecture to the version number:
-    let bundle = Services.strings.createBundle("chrome://browser/locale/browser.properties");
-    let archResource = Services.appinfo.is64Bit
-                       ? "aboutDialog.architecture.sixtyFourBit"
-                       : "aboutDialog.architecture.thirtyTwoBit";
-    let arch = bundle.GetStringFromName(archResource);
-    version += ` (${arch})`;
-
-    document.getElementById("version").textContent = version;
-
-    // Show a release notes link if we have a URL.
-    let relNotesLink = document.getElementById("releasenotes");
-    let relNotesPrefType = Services.prefs.getPrefType("app.releaseNotesURL");
-    if (relNotesPrefType != Services.prefs.PREF_INVALID) {
-      let relNotesURL = Services.urlFormatter.formatURLPref("app.releaseNotesURL");
-      if (relNotesURL != "about:blank") {
-        relNotesLink.href = relNotesURL;
-        relNotesLink.hidden = false;
-      }
-    }
-
-    let distroId = Services.prefs.getCharPref("distribution.id", "");
-    if (distroId) {
-      let distroVersion = Services.prefs.getCharPref("distribution.version");
-
-      let distroIdField = document.getElementById("distributionId");
-      distroIdField.value = distroId + " - " + distroVersion;
-      distroIdField.hidden = false;
-
-      let distroAbout = Services.prefs.getStringPref("distribution.about", "");
-      if (distroAbout) {
-        let distroField = document.getElementById("distribution");
-        distroField.value = distroAbout;
-        distroField.hidden = false;
-      }
-    }
-
-    if (AppConstants.MOZ_UPDATER) {
-      gAppUpdater = new appUpdater();
-      let onUnload = () => {
-        window.removeEventListener("unload", onUnload);
-        Services.prefs.removeObserver("app.update.", this);
-      };
-      window.addEventListener("unload", onUnload);
-      Services.prefs.addObserver("app.update.", this);
-      this.updateReadPrefs();
-      setEventListener("updateRadioGroup", "command",
-                       gAdvancedPane.updateWritePrefs);
-      setEventListener("showUpdateHistory", "command",
-                       gAdvancedPane.showUpdates);
-    }
-  },
-
-  /*
-   * Preferences:
-   *
-   * app.update.enabled
-   * - true if updates to the application are enabled, false otherwise
-   * app.update.auto
-   * - true if updates should be automatically downloaded and installed and
-   * false if the user should be asked what he wants to do when an update is
-   * available
-   * extensions.update.enabled
-   * - true if updates to extensions and themes are enabled, false otherwise
-   * browser.search.update
-   * - true if updates to search engines are enabled, false otherwise
-   */
-
-  /**
-   * Selects the item of the radiogroup based on the pref values and locked
-   * states.
-   *
-   * UI state matrix for update preference conditions
-   *
-   * UI Components:                              Preferences
-   * Radiogroup                                  i   = app.update.enabled
-   *                                             ii  = app.update.auto
-   *
-   * Disabled states:
-   * Element           pref  value  locked  disabled
-   * radiogroup        i     t/f    f       false
-   *                   i     t/f    *t*     *true*
-   *                   ii    t/f    f       false
-   *                   ii    t/f    *t*     *true*
-   */
-  updateReadPrefs() {
-    if (AppConstants.MOZ_UPDATER) {
-      var enabledPref = document.getElementById("app.update.enabled");
-      var autoPref = document.getElementById("app.update.auto");
-      var radiogroup = document.getElementById("updateRadioGroup");
-
-      if (!enabledPref.value)   // Don't care for autoPref.value in this case.
-        radiogroup.value = "manual";    // 3. Never check for updates.
-      else if (autoPref.value)  // enabledPref.value && autoPref.value
-        radiogroup.value = "auto";      // 1. Automatically install updates
-      else                      // enabledPref.value && !autoPref.value
-        radiogroup.value = "checkOnly"; // 2. Check, but let me choose
-
-      var canCheck = Components.classes["@mozilla.org/updates/update-service;1"].
-                       getService(Components.interfaces.nsIApplicationUpdateService).
-                       canCheckForUpdates;
-      // canCheck is false if the enabledPref is false and locked,
-      // or the binary platform or OS version is not known.
-      // A locked pref is sufficient to disable the radiogroup.
-      radiogroup.disabled = !canCheck || enabledPref.locked || autoPref.locked;
-
-      if (AppConstants.MOZ_MAINTENANCE_SERVICE) {
-        // Check to see if the maintenance service is installed.
-        // If it is don't show the preference at all.
-        var installed;
-        try {
-          var wrk = Components.classes["@mozilla.org/windows-registry-key;1"]
-                    .createInstance(Components.interfaces.nsIWindowsRegKey);
-          wrk.open(wrk.ROOT_KEY_LOCAL_MACHINE,
-                   "SOFTWARE\\Mozilla\\MaintenanceService",
-                   wrk.ACCESS_READ | wrk.WOW64_64);
-          installed = wrk.readIntValue("Installed");
-          wrk.close();
-        } catch (e) {
-        }
-        if (installed != 1) {
-          document.getElementById("useService").hidden = true;
-        }
-      }
-    }
-  },
-
-  /**
-   * Sets the pref values based on the selected item of the radiogroup.
-   */
-  updateWritePrefs() {
-    if (AppConstants.MOZ_UPDATER) {
-      var enabledPref = document.getElementById("app.update.enabled");
-      var autoPref = document.getElementById("app.update.auto");
-      var radiogroup = document.getElementById("updateRadioGroup");
-      switch (radiogroup.value) {
-        case "auto":      // 1. Automatically install updates for Desktop only
-          enabledPref.value = true;
-          autoPref.value = true;
-          break;
-        case "checkOnly": // 2. Check, but let me choose
-          enabledPref.value = true;
-          autoPref.value = false;
-          break;
-        case "manual":    // 3. Never check for updates.
-          enabledPref.value = false;
-          autoPref.value = false;
-      }
-    }
-  },
-
-  /**
-   * Displays the history of installed updates.
-   */
-  showUpdates() {
-    gSubDialog.open("chrome://mozapps/content/update/history.xul");
-  },
-
-  observe(aSubject, aTopic, aData) {
-    if (AppConstants.MOZ_UPDATER) {
-      switch (aTopic) {
-        case "nsPref:changed":
-          this.updateReadPrefs();
-          break;
-      }
-    }
-  },
-};
deleted file mode 100644
--- a/browser/components/preferences/in-content-new/advanced.xul
+++ /dev/null
@@ -1,195 +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/.
-
-<!-- Advanced panel -->
-
-#ifdef MOZ_UPDATER
-  <script type="application/javascript" src="chrome://browser/content/aboutDialog-appUpdater.js"/>
-#endif
-
-<script type="application/javascript"
-        src="chrome://browser/content/preferences/in-content-new/advanced.js"/>
-
-<preferences id="advancedPreferences" hidden="true" data-category="paneAdvanced">
-  <preference id="browser.preferences.advanced.selectedTabIndex"
-              name="browser.preferences.advanced.selectedTabIndex"
-              type="int"/>
-
-<!-- Update tab -->
-#ifdef MOZ_UPDATER
-  <preference id="app.update.enabled"
-              name="app.update.enabled"
-              type="bool"/>
-  <preference id="app.update.auto"
-              name="app.update.auto"
-              type="bool"/>
-
-  <preference id="app.update.disable_button.showUpdateHistory"
-              name="app.update.disable_button.showUpdateHistory"
-              type="bool"/>
-
-#ifdef MOZ_MAINTENANCE_SERVICE
-  <preference id="app.update.service.enabled"
-              name="app.update.service.enabled"
-              type="bool"/>
-#endif
-#endif
-
-  <preference id="browser.search.update"
-              name="browser.search.update"
-              type="bool"/>
-</preferences>
-
-#ifdef HAVE_SHELL_SERVICE
-  <stringbundle id="bundleShell" src="chrome://browser/locale/shellservice.properties"/>
-  <stringbundle id="bundleBrand" src="chrome://branding/locale/brand.properties"/>
-#endif
-
-<hbox id="header-advanced"
-      class="header"
-      hidden="true"
-      data-category="paneAdvanced">
-  <label class="header-name" flex="1">&paneUpdates.title;</label>
-</hbox>
-
-<!-- Update -->
-<groupbox id="updateApp" data-category="paneAdvanced" hidden="true">
-  <caption><label>&updateApplication.label;</label></caption>
-  <hbox align="start">
-    <vbox flex="1">
-      <description>
-        &updateApplication.version.pre;<label id="version"/>&updateApplication.version.post;
-        <label id="releasenotes" class="learnMore text-link" hidden="true">&releaseNotes.link;</label>
-      </description>
-      <description id="distribution" class="text-blurb" hidden="true"/>
-      <description id="distributionId" class="text-blurb" hidden="true"/>
-    </vbox>
-#ifdef MOZ_UPDATER
-    <spacer flex="1"/>
-    <vbox>
-      <button id="showUpdateHistory"
-              class="accessory-button"
-              label="&updateHistory2.label;"
-              accesskey="&updateHistory2.accesskey;"
-              preference="app.update.disable_button.showUpdateHistory"
-              searchkeywords="&history.title; &history.intro;"/>
-    </vbox>
-#endif
-  </hbox>
-#ifdef MOZ_UPDATER
-  <vbox id="updateBox">
-    <deck id="updateDeck" orient="vertical">
-      <hbox id="checkForUpdates" align="center">
-        <spacer flex="1"/>
-        <button id="checkForUpdatesButton"
-                label="&update.checkForUpdatesButton.label;"
-                accesskey="&update.checkForUpdatesButton.accesskey;"
-                oncommand="gAppUpdater.checkForUpdates();"/>
-      </hbox>
-      <hbox id="downloadAndInstall" align="center">
-        <spacer flex="1"/>
-        <button id="downloadAndInstallButton"
-                oncommand="gAppUpdater.startDownload();"/>
-                <!-- label and accesskey will be filled by JS -->
-      </hbox>
-      <hbox id="apply" align="center">
-        <spacer flex="1"/>
-        <button id="updateButton"
-                label="&update.updateButton.label3;"
-                accesskey="&update.updateButton.accesskey;"
-                oncommand="gAppUpdater.buttonRestartAfterDownload();"/>
-      </hbox>
-      <hbox id="checkingForUpdates" align="center">
-        <image class="update-throbber"/><label>&update.checkingForUpdates;</label>
-        <spacer flex="1"/>
-        <button label="&update.checkForUpdatesButton.label;"
-                accesskey="&update.checkForUpdatesButton.accesskey;"
-                disabled="true"/>
-      </hbox>
-      <hbox id="downloading" align="center">
-        <image class="update-throbber"/><label>&update.downloading.start;</label><label id="downloadStatus"/><label>&update.downloading.end;</label>
-      </hbox>
-      <hbox id="applying" align="center">
-        <image class="update-throbber"/><label>&update.applying;</label>
-      </hbox>
-      <hbox id="downloadFailed" align="center">
-        <label>&update.failed.start;</label><label id="failedLink" class="text-link">&update.failed.linkText;</label><label>&update.failed.end;</label>
-        <spacer flex="1"/>
-        <button label="&update.checkForUpdatesButton.label;"
-                accesskey="&update.checkForUpdatesButton.accesskey;"
-                oncommand="gAppUpdater.checkForUpdates();"/>
-      </hbox>
-      <hbox id="adminDisabled" align="center">
-        <label>&update.adminDisabled;</label>
-        <spacer flex="1"/>
-        <button label="&update.checkForUpdatesButton.label;"
-                accesskey="&update.checkForUpdatesButton.accesskey;"
-                disabled="true"/>
-      </hbox>
-      <hbox id="noUpdatesFound" align="center">
-        <label>&update.noUpdatesFound;</label>
-        <spacer flex="1"/>
-        <button label="&update.checkForUpdatesButton.label;"
-                accesskey="&update.checkForUpdatesButton.accesskey;"
-                oncommand="gAppUpdater.checkForUpdates();"/>
-      </hbox>
-      <hbox id="otherInstanceHandlingUpdates" align="center">
-        <label>&update.otherInstanceHandlingUpdates;</label>
-        <spacer flex="1"/>
-        <button label="&update.checkForUpdatesButton.label;"
-                accesskey="&update.checkForUpdatesButton.accesskey;"
-                disabled="true"/>
-      </hbox>
-      <hbox id="manualUpdate" align="center">
-        <label>&update.manual.start;</label><label id="manualLink" class="text-link"/><label>&update.manual.end;</label>
-        <spacer flex="1"/>
-        <button label="&update.checkForUpdatesButton.label;"
-                accesskey="&update.checkForUpdatesButton.accesskey;"
-                disabled="true"/>
-      </hbox>
-      <hbox id="unsupportedSystem" align="center">
-        <label>&update.unsupported.start;</label><label id="unsupportedLink" class="text-link">&update.unsupported.linkText;</label><label>&update.unsupported.end;</label>
-        <spacer flex="1"/>
-        <button label="&update.checkForUpdatesButton.label;"
-                accesskey="&update.checkForUpdatesButton.accesskey;"
-                disabled="true"/>
-      </hbox>
-      <hbox id="restarting" align="center">
-        <image class="update-throbber"/><label>&update.restarting;</label>
-        <spacer flex="1"/>
-        <button label="&update.updateButton.label3;"
-                accesskey="&update.updateButton.accesskey;"
-                disabled="true"/>
-      </hbox>
-    </deck>
-  </vbox>
-#endif
-
-  <separator/>
-#ifdef MOZ_UPDATER
-  <description>&updateApplication.description;</description>
-  <radiogroup id="updateRadioGroup">
-    <radio id="autoDesktop"
-           value="auto"
-           label="&updateAuto2.label;"
-           accesskey="&updateAuto2.accesskey;"/>
-    <radio value="checkOnly"
-          label="&updateCheckChoose2.label;"
-          accesskey="&updateCheckChoose2.accesskey;"/>
-    <radio value="manual"
-          label="&updateManual2.label;"
-          accesskey="&updateManual2.accesskey;"/>
-  </radiogroup>
-#ifdef MOZ_MAINTENANCE_SERVICE
-  <checkbox id="useService"
-            label="&useService.label;"
-            accesskey="&useService.accesskey;"
-            preference="app.update.service.enabled"/>
-#endif
-#endif
-  <checkbox id="enableSearchUpdate"
-            label="&enableSearchUpdate2.label;"
-            accesskey="&enableSearchUpdate2.accesskey;"
-            preference="browser.search.update"/>
-</groupbox>
deleted file mode 100644
--- a/browser/components/preferences/in-content-new/applications.js
+++ /dev/null
@@ -1,2101 +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/. */
-
-/* import-globals-from preferences.js */
-
-"use strict";
-
-// Constants & Enumeration Values
-
-Components.utils.import("resource://gre/modules/Services.jsm");
-Components.utils.import("resource://gre/modules/AppConstants.jsm");
-
-const TYPE_MAYBE_FEED = "application/vnd.mozilla.maybe.feed";
-const TYPE_MAYBE_VIDEO_FEED = "application/vnd.mozilla.maybe.video.feed";
-const TYPE_MAYBE_AUDIO_FEED = "application/vnd.mozilla.maybe.audio.feed";
-const TYPE_PDF = "application/pdf";
-
-const PREF_PDFJS_DISABLED = "pdfjs.disabled";
-const TOPIC_PDFJS_HANDLER_CHANGED = "pdfjs:handlerChanged";
-
-const PREF_DISABLED_PLUGIN_TYPES = "plugin.disable_full_page_plugin_for_types";
-
-// Preferences that affect which entries to show in the list.
-const PREF_SHOW_PLUGINS_IN_LIST = "browser.download.show_plugins_in_list";
-const PREF_HIDE_PLUGINS_WITHOUT_EXTENSIONS =
-  "browser.download.hide_plugins_without_extensions";
-
-/*
- * Preferences where we store handling information about the feed type.
- *
- * browser.feeds.handler
- * - "bookmarks", "reader" (clarified further using the .default preference),
- *   or "ask" -- indicates the default handler being used to process feeds;
- *   "bookmarks" is obsolete; to specify that the handler is bookmarks,
- *   set browser.feeds.handler.default to "bookmarks";
- *
- * browser.feeds.handler.default
- * - "bookmarks", "client" or "web" -- indicates the chosen feed reader used
- *   to display feeds, either transiently (i.e., when the "use as default"
- *   checkbox is unchecked, corresponds to when browser.feeds.handler=="ask")
- *   or more permanently (i.e., the item displayed in the dropdown in Feeds
- *   preferences)
- *
- * browser.feeds.handler.webservice
- * - the URL of the currently selected web service used to read feeds
- *
- * browser.feeds.handlers.application
- * - nsILocalFile, stores the current client-side feed reading app if one has
- *   been chosen
- */
-const PREF_FEED_SELECTED_APP    = "browser.feeds.handlers.application";
-const PREF_FEED_SELECTED_WEB    = "browser.feeds.handlers.webservice";
-const PREF_FEED_SELECTED_ACTION = "browser.feeds.handler";
-const PREF_FEED_SELECTED_READER = "browser.feeds.handler.default";
-
-const PREF_VIDEO_FEED_SELECTED_APP    = "browser.videoFeeds.handlers.application";
-const PREF_VIDEO_FEED_SELECTED_WEB    = "browser.videoFeeds.handlers.webservice";
-const PREF_VIDEO_FEED_SELECTED_ACTION = "browser.videoFeeds.handler";
-const PREF_VIDEO_FEED_SELECTED_READER = "browser.videoFeeds.handler.default";
-
-const PREF_AUDIO_FEED_SELECTED_APP    = "browser.audioFeeds.handlers.application";
-const PREF_AUDIO_FEED_SELECTED_WEB    = "browser.audioFeeds.handlers.webservice";
-const PREF_AUDIO_FEED_SELECTED_ACTION = "browser.audioFeeds.handler";
-const PREF_AUDIO_FEED_SELECTED_READER = "browser.audioFeeds.handler.default";
-
-// The nsHandlerInfoAction enumeration values in nsIHandlerInfo identify
-// the actions the application can take with content of various types.
-// But since nsIHandlerInfo doesn't support plugins, there's no value
-// identifying the "use plugin" action, so we use this constant instead.
-const kActionUsePlugin = 5;
-
-const ICON_URL_APP = AppConstants.platform == "linux" ?
-                     "moz-icon://dummy.exe?size=16" :
-                     "chrome://browser/skin/preferences/application.png";
-
-// For CSS. Can be one of "ask", "save", "plugin" or "feed". If absent, the icon URL
-// was set by us to a custom handler icon and CSS should not try to override it.
-const APP_ICON_ATTR_NAME = "appHandlerIcon";
-
-// Utilities
-
-function getFileDisplayName(file) {
-  if (AppConstants.platform == "win") {
-    if (file instanceof Ci.nsILocalFileWin) {
-      try {
-        return file.getVersionInfoField("FileDescription");
-      } catch (e) {}
-    }
-  }
-  if (AppConstants.platform == "macosx") {
-    if (file instanceof Ci.nsILocalFileMac) {
-      try {
-        return file.bundleDisplayName;
-      } catch (e) {}
-    }
-  }
-  return file.leafName;
-}
-
-function getLocalHandlerApp(aFile) {
-  var localHandlerApp = Cc["@mozilla.org/uriloader/local-handler-app;1"].
-                        createInstance(Ci.nsILocalHandlerApp);
-  localHandlerApp.name = getFileDisplayName(aFile);
-  localHandlerApp.executable = aFile;
-
-  return localHandlerApp;
-}
-
-/**
- * An enumeration of items in a JS array.
- *
- * FIXME: use ArrayConverter once it lands (bug 380839).
- *
- * @constructor
- */
-function ArrayEnumerator(aItems) {
-  this._index = 0;
-  this._contents = aItems;
-}
-
-ArrayEnumerator.prototype = {
-  _index: 0,
-
-  hasMoreElements() {
-    return this._index < this._contents.length;
-  },
-
-  getNext() {
-    return this._contents[this._index++];
-  }
-};
-
-function isFeedType(t) {
-  return t == TYPE_MAYBE_FEED || t == TYPE_MAYBE_VIDEO_FEED || t == TYPE_MAYBE_AUDIO_FEED;
-}
-
-// HandlerInfoWrapper
-
-/**
- * This object wraps nsIHandlerInfo with some additional functionality
- * the Applications prefpane needs to display and allow modification of
- * the list of handled types.
- *
- * We create an instance of this wrapper for each entry we might display
- * in the prefpane, and we compose the instances from various sources,
- * including plugins and the handler service.
- *
- * We don't implement all the original nsIHandlerInfo functionality,
- * just the stuff that the prefpane needs.
- *
- * In theory, all of the custom functionality in this wrapper should get
- * pushed down into nsIHandlerInfo eventually.
- */
-function HandlerInfoWrapper(aType, aHandlerInfo) {
-  this._type = aType;
-  this.wrappedHandlerInfo = aHandlerInfo;
-}
-
-HandlerInfoWrapper.prototype = {
-  // The wrapped nsIHandlerInfo object.  In general, this object is private,
-  // but there are a couple cases where callers access it directly for things
-  // we haven't (yet?) implemented, so we make it a public property.
-  wrappedHandlerInfo: null,
-
-
-  // Convenience Utils
-
-  _handlerSvc: Cc["@mozilla.org/uriloader/handler-service;1"].
-               getService(Ci.nsIHandlerService),
-
-  _prefSvc: Cc["@mozilla.org/preferences-service;1"].
-            getService(Ci.nsIPrefBranch),
-
-  _categoryMgr: Cc["@mozilla.org/categorymanager;1"].
-                getService(Ci.nsICategoryManager),
-
-  element(aID) {
-    return document.getElementById(aID);
-  },
-
-
-  // nsIHandlerInfo
-
-  // The MIME type or protocol scheme.
-  _type: null,
-  get type() {
-    return this._type;
-  },
-
-  get description() {
-    if (this.wrappedHandlerInfo.description)
-      return this.wrappedHandlerInfo.description;
-
-    if (this.primaryExtension) {
-      var extension = this.primaryExtension.toUpperCase();
-      return this.element("bundlePreferences").getFormattedString("fileEnding",
-                                                                  [extension]);
-    }
-
-    return this.type;
-  },
-
-  get preferredApplicationHandler() {
-    return this.wrappedHandlerInfo.preferredApplicationHandler;
-  },
-
-  set preferredApplicationHandler(aNewValue) {
-    this.wrappedHandlerInfo.preferredApplicationHandler = aNewValue;
-
-    // Make sure the preferred handler is in the set of possible handlers.
-    if (aNewValue)
-      this.addPossibleApplicationHandler(aNewValue)
-  },
-
-  get possibleApplicationHandlers() {
-    return this.wrappedHandlerInfo.possibleApplicationHandlers;
-  },
-
-  addPossibleApplicationHandler(aNewHandler) {
-    var possibleApps = this.possibleApplicationHandlers.enumerate();
-    while (possibleApps.hasMoreElements()) {
-      if (possibleApps.getNext().equals(aNewHandler))
-        return;
-    }
-    this.possibleApplicationHandlers.appendElement(aNewHandler);
-  },
-
-  removePossibleApplicationHandler(aHandler) {
-    var defaultApp = this.preferredApplicationHandler;
-    if (defaultApp && aHandler.equals(defaultApp)) {
-      // If the app we remove was the default app, we must make sure
-      // it won't be used anymore
-      this.alwaysAskBeforeHandling = true;
-      this.preferredApplicationHandler = null;
-    }
-
-    var handlers = this.possibleApplicationHandlers;
-    for (var i = 0; i < handlers.length; ++i) {
-      var handler = handlers.queryElementAt(i, Ci.nsIHandlerApp);
-      if (handler.equals(aHandler)) {
-        handlers.removeElementAt(i);
-        break;
-      }
-    }
-  },
-
-  get hasDefaultHandler() {
-    return this.wrappedHandlerInfo.hasDefaultHandler;
-  },
-
-  get defaultDescription() {
-    return this.wrappedHandlerInfo.defaultDescription;
-  },
-
-  // What to do with content of this type.
-  get preferredAction() {
-    // If we have an enabled plugin, then the action is to use that plugin.
-    if (this.pluginName && !this.isDisabledPluginType)
-      return kActionUsePlugin;
-
-    // If the action is to use a helper app, but we don't have a preferred
-    // handler app, then switch to using the system default, if any; otherwise
-    // fall back to saving to disk, which is the default action in nsMIMEInfo.
-    // Note: "save to disk" is an invalid value for protocol info objects,
-    // but the alwaysAskBeforeHandling getter will detect that situation
-    // and always return true in that case to override this invalid value.
-    if (this.wrappedHandlerInfo.preferredAction == Ci.nsIHandlerInfo.useHelperApp &&
-        !gApplicationsPane.isValidHandlerApp(this.preferredApplicationHandler)) {
-      if (this.wrappedHandlerInfo.hasDefaultHandler)
-        return Ci.nsIHandlerInfo.useSystemDefault;
-      return Ci.nsIHandlerInfo.saveToDisk;
-    }
-
-    return this.wrappedHandlerInfo.preferredAction;
-  },
-
-  set preferredAction(aNewValue) {
-    // If the action is to use the plugin,
-    // we must set the preferred action to "save to disk".
-    // But only if it's not currently the preferred action.
-    if ((aNewValue == kActionUsePlugin) &&
-        (this.preferredAction != Ci.nsIHandlerInfo.saveToDisk)) {
-      aNewValue = Ci.nsIHandlerInfo.saveToDisk;
-    }
-
-    // We don't modify the preferred action if the new action is to use a plugin
-    // because handler info objects don't understand our custom "use plugin"
-    // value.  Also, leaving it untouched means that we can automatically revert
-    // to the old setting if the user ever removes the plugin.
-
-    if (aNewValue != kActionUsePlugin)
-      this.wrappedHandlerInfo.preferredAction = aNewValue;
-  },
-
-  get alwaysAskBeforeHandling() {
-    // If this type is handled only by a plugin, we can't trust the value
-    // in the handler info object, since it'll be a default based on the absence
-    // of any user configuration, and the default in that case is to always ask,
-    // even though we never ask for content handled by a plugin, so special case
-    // plugin-handled types by returning false here.
-    if (this.pluginName && this.handledOnlyByPlugin)
-      return false;
-
-    // If this is a protocol type and the preferred action is "save to disk",
-    // which is invalid for such types, then return true here to override that
-    // action.  This could happen when the preferred action is to use a helper
-    // app, but the preferredApplicationHandler is invalid, and there isn't
-    // a default handler, so the preferredAction getter returns save to disk
-    // instead.
-    if (!(this.wrappedHandlerInfo instanceof Ci.nsIMIMEInfo) &&
-        this.preferredAction == Ci.nsIHandlerInfo.saveToDisk)
-      return true;
-
-    return this.wrappedHandlerInfo.alwaysAskBeforeHandling;
-  },
-
-  set alwaysAskBeforeHandling(aNewValue) {
-    this.wrappedHandlerInfo.alwaysAskBeforeHandling = aNewValue;
-  },
-
-
-  // nsIMIMEInfo
-
-  // The primary file extension associated with this type, if any.
-  //
-  // XXX Plugin objects contain an array of MimeType objects with "suffixes"
-  // properties; if this object has an associated plugin, shouldn't we check
-  // those properties for an extension?
-  get primaryExtension() {
-    try {
-      if (this.wrappedHandlerInfo instanceof Ci.nsIMIMEInfo &&
-          this.wrappedHandlerInfo.primaryExtension)
-        return this.wrappedHandlerInfo.primaryExtension
-    } catch (ex) {}
-
-    return null;
-  },
-
-
-  // Plugin Handling
-
-  // A plugin that can handle this type, if any.
-  //
-  // Note: just because we have one doesn't mean it *will* handle the type.
-  // That depends on whether or not the type is in the list of types for which
-  // plugin handling is disabled.
-  plugin: null,
-
-  // Whether or not this type is only handled by a plugin or is also handled
-  // by some user-configured action as specified in the handler info object.
-  //
-  // Note: we can't just check if there's a handler info object for this type,
-  // because OS and user configuration is mixed up in the handler info object,
-  // so we always need to retrieve it for the OS info and can't tell whether
-  // it represents only OS-default information or user-configured information.
-  //
-  // FIXME: once handler info records are broken up into OS-provided records
-  // and user-configured records, stop using this boolean flag and simply
-  // check for the presence of a user-configured record to determine whether
-  // or not this type is only handled by a plugin.  Filed as bug 395142.
-  handledOnlyByPlugin: undefined,
-
-  get isDisabledPluginType() {
-    return this._getDisabledPluginTypes().indexOf(this.type) != -1;
-  },
-
-  _getDisabledPluginTypes() {
-    var types = "";
-
-    if (this._prefSvc.prefHasUserValue(PREF_DISABLED_PLUGIN_TYPES))
-      types = this._prefSvc.getCharPref(PREF_DISABLED_PLUGIN_TYPES);
-
-    // Only split if the string isn't empty so we don't end up with an array
-    // containing a single empty string.
-    if (types != "")
-      return types.split(",");
-
-    return [];
-  },
-
-  disablePluginType() {
-    var disabledPluginTypes = this._getDisabledPluginTypes();
-
-    if (disabledPluginTypes.indexOf(this.type) == -1)
-      disabledPluginTypes.push(this.type);
-
-    this._prefSvc.setCharPref(PREF_DISABLED_PLUGIN_TYPES,
-                              disabledPluginTypes.join(","));
-
-    // Update the category manager so existing browser windows update.
-    this._categoryMgr.deleteCategoryEntry("Gecko-Content-Viewers",
-                                          this.type,
-                                          false);
-  },
-
-  enablePluginType() {
-    var disabledPluginTypes = this._getDisabledPluginTypes();
-
-    var type = this.type;
-    disabledPluginTypes = disabledPluginTypes.filter(v => v != type);
-
-    this._prefSvc.setCharPref(PREF_DISABLED_PLUGIN_TYPES,
-                              disabledPluginTypes.join(","));
-
-    // Update the category manager so existing browser windows update.
-    this._categoryMgr.
-      addCategoryEntry("Gecko-Content-Viewers",
-                       this.type,
-                       "@mozilla.org/content/plugin/document-loader-factory;1",
-                       false,
-                       true);
-  },
-
-
-  // Storage
-
-  store() {
-    this._handlerSvc.store(this.wrappedHandlerInfo);
-  },
-
-
-  // Icons
-
-  get smallIcon() {
-    return this._getIcon(16);
-  },
-
-  _getIcon(aSize) {
-    if (this.primaryExtension)
-      return "moz-icon://goat." + this.primaryExtension + "?size=" + aSize;
-
-    if (this.wrappedHandlerInfo instanceof Ci.nsIMIMEInfo)
-      return "moz-icon://goat?size=" + aSize + "&contentType=" + this.type;
-
-    // FIXME: consider returning some generic icon when we can't get a URL for
-    // one (for example in the case of protocol schemes).  Filed as bug 395141.
-    return null;
-  }
-
-};
-
-
-// Feed Handler Info
-
-/**
- * This object implements nsIHandlerInfo for the feed types.  It's a separate
- * object because we currently store handling information for the feed type
- * in a set of preferences rather than the nsIHandlerService-managed datastore.
- *
- * This object inherits from HandlerInfoWrapper in order to get functionality
- * that isn't special to the feed type.
- *
- * XXX Should we inherit from HandlerInfoWrapper?  After all, we override
- * most of that wrapper's properties and methods, and we have to dance around
- * the fact that the wrapper expects to have a wrappedHandlerInfo, which we
- * don't provide.
- */
-
-function FeedHandlerInfo(aMIMEType) {
-  HandlerInfoWrapper.call(this, aMIMEType, null);
-}
-
-FeedHandlerInfo.prototype = {
-  __proto__: HandlerInfoWrapper.prototype,
-
-  // Convenience Utils
-
-  _converterSvc:
-    Cc["@mozilla.org/embeddor.implemented/web-content-handler-registrar;1"].
-    getService(Ci.nsIWebContentConverterService),
-
-  _shellSvc: AppConstants.HAVE_SHELL_SERVICE ? getShellService() : null,
-
-  // nsIHandlerInfo
-
-  get description() {
-    return this.element("bundlePreferences").getString(this._appPrefLabel);
-  },
-
-  get preferredApplicationHandler() {
-    switch (this.element(this._prefSelectedReader).value) {
-      case "client":
-        var file = this.element(this._prefSelectedApp).value;
-        if (file)
-          return getLocalHandlerApp(file);
-
-        return null;
-
-      case "web":
-        var uri = this.element(this._prefSelectedWeb).value;
-        if (!uri)
-          return null;
-        return this._converterSvc.getWebContentHandlerByURI(this.type, uri);
-
-      case "bookmarks":
-      default:
-        // When the pref is set to bookmarks, we handle feeds internally,
-        // we don't forward them to a local or web handler app, so there is
-        // no preferred handler.
-        return null;
-    }
-  },
-
-  set preferredApplicationHandler(aNewValue) {
-    if (aNewValue instanceof Ci.nsILocalHandlerApp) {
-      this.element(this._prefSelectedApp).value = aNewValue.executable;
-      this.element(this._prefSelectedReader).value = "client";
-    } else if (aNewValue instanceof Ci.nsIWebContentHandlerInfo) {
-      this.element(this._prefSelectedWeb).value = aNewValue.uri;
-      this.element(this._prefSelectedReader).value = "web";
-      // Make the web handler be the new "auto handler" for feeds.
-      // Note: we don't have to unregister the auto handler when the user picks
-      // a non-web handler (local app, Live Bookmarks, etc.) because the service
-      // only uses the "auto handler" when the selected reader is a web handler.
-      // We also don't have to unregister it when the user turns on "always ask"
-      // (i.e. preview in browser), since that also overrides the auto handler.
-      this._converterSvc.setAutoHandler(this.type, aNewValue);
-    }
-  },
-
-  _possibleApplicationHandlers: null,
-
-  get possibleApplicationHandlers() {
-    if (this._possibleApplicationHandlers)
-      return this._possibleApplicationHandlers;
-
-    // A minimal implementation of nsIMutableArray.  It only supports the two
-    // methods its callers invoke, namely appendElement and nsIArray::enumerate.
-    this._possibleApplicationHandlers = {
-      _inner: [],
-      _removed: [],
-
-      QueryInterface(aIID) {
-        if (aIID.equals(Ci.nsIMutableArray) ||
-            aIID.equals(Ci.nsIArray) ||
-            aIID.equals(Ci.nsISupports))
-          return this;
-
-        throw Cr.NS_ERROR_NO_INTERFACE;
-      },
-
-      get length() {
-        return this._inner.length;
-      },
-
-      enumerate() {
-        return new ArrayEnumerator(this._inner);
-      },
-
-      appendElement(aHandlerApp, aWeak) {
-        this._inner.push(aHandlerApp);
-      },
-
-      removeElementAt(aIndex) {
-        this._removed.push(this._inner[aIndex]);
-        this._inner.splice(aIndex, 1);
-      },
-
-      queryElementAt(aIndex, aInterface) {
-        return this._inner[aIndex].QueryInterface(aInterface);
-      }
-    };
-
-    // Add the selected local app if it's different from the OS default handler.
-    // Unlike for other types, we can store only one local app at a time for the
-    // feed type, since we store it in a preference that historically stores
-    // only a single path.  But we display all the local apps the user chooses
-    // while the prefpane is open, only dropping the list when the user closes
-    // the prefpane, for maximum usability and consistency with other types.
-    var preferredAppFile = this.element(this._prefSelectedApp).value;
-    if (preferredAppFile) {
-      let preferredApp = getLocalHandlerApp(preferredAppFile);
-      let defaultApp = this._defaultApplicationHandler;
-      if (!defaultApp || !defaultApp.equals(preferredApp))
-        this._possibleApplicationHandlers.appendElement(preferredApp);
-    }
-
-    // Add the registered web handlers.  There can be any number of these.
-    var webHandlers = this._converterSvc.getContentHandlers(this.type);
-    for (let webHandler of webHandlers)
-      this._possibleApplicationHandlers.appendElement(webHandler);
-
-    return this._possibleApplicationHandlers;
-  },
-
-  __defaultApplicationHandler: undefined,
-  get _defaultApplicationHandler() {
-    if (typeof this.__defaultApplicationHandler != "undefined")
-      return this.__defaultApplicationHandler;
-
-    var defaultFeedReader = null;
-    if (AppConstants.HAVE_SHELL_SERVICE) {
-      try {
-        defaultFeedReader = this._shellSvc.defaultFeedReader;
-      } catch (ex) {
-        // no default reader or _shellSvc is null
-      }
-    }
-
-    if (defaultFeedReader) {
-      let handlerApp = Cc["@mozilla.org/uriloader/local-handler-app;1"].
-                       createInstance(Ci.nsIHandlerApp);
-      handlerApp.name = getFileDisplayName(defaultFeedReader);
-      handlerApp.QueryInterface(Ci.nsILocalHandlerApp);
-      handlerApp.executable = defaultFeedReader;
-
-      this.__defaultApplicationHandler = handlerApp;
-    } else {
-      this.__defaultApplicationHandler = null;
-    }
-
-    return this.__defaultApplicationHandler;
-  },
-
-  get hasDefaultHandler() {
-    if (AppConstants.HAVE_SHELL_SERVICE) {
-      try {
-        if (this._shellSvc.defaultFeedReader)
-          return true;
-      } catch (ex) {
-        // no default reader or _shellSvc is null
-      }
-    }
-
-    return false;
-  },
-
-  get defaultDescription() {
-    if (this.hasDefaultHandler)
-      return this._defaultApplicationHandler.name;
-
-    // Should we instead return null?
-    return "";
-  },
-
-  // What to do with content of this type.
-  get preferredAction() {
-    switch (this.element(this._prefSelectedAction).value) {
-
-      case "bookmarks":
-        return Ci.nsIHandlerInfo.handleInternally;
-
-      case "reader": {
-        let preferredApp = this.preferredApplicationHandler;
-        let defaultApp = this._defaultApplicationHandler;
-
-        // If we have a valid preferred app, return useSystemDefault if it's
-        // the default app; otherwise return useHelperApp.
-        if (gApplicationsPane.isValidHandlerApp(preferredApp)) {
-          if (defaultApp && defaultApp.equals(preferredApp))
-            return Ci.nsIHandlerInfo.useSystemDefault;
-
-          return Ci.nsIHandlerInfo.useHelperApp;
-        }
-
-        // The pref is set to "reader", but we don't have a valid preferred app.
-        // What do we do now?  Not sure this is the best option (perhaps we
-        // should direct the user to the default app, if any), but for now let's
-        // direct the user to live bookmarks.
-        return Ci.nsIHandlerInfo.handleInternally;
-      }
-
-      // If the action is "ask", then alwaysAskBeforeHandling will override
-      // the action, so it doesn't matter what we say it is, it just has to be
-      // something that doesn't cause the controller to hide the type.
-      case "ask":
-      default:
-        return Ci.nsIHandlerInfo.handleInternally;
-    }
-  },
-
-  set preferredAction(aNewValue) {
-    switch (aNewValue) {
-
-      case Ci.nsIHandlerInfo.handleInternally:
-        this.element(this._prefSelectedReader).value = "bookmarks";
-        break;
-
-      case Ci.nsIHandlerInfo.useHelperApp:
-        this.element(this._prefSelectedAction).value = "reader";
-        // The controller has already set preferredApplicationHandler
-        // to the new helper app.
-        break;
-
-      case Ci.nsIHandlerInfo.useSystemDefault:
-        this.element(this._prefSelectedAction).value = "reader";
-        this.preferredApplicationHandler = this._defaultApplicationHandler;
-        break;
-    }
-  },
-
-  get alwaysAskBeforeHandling() {
-    return this.element(this._prefSelectedAction).value == "ask";
-  },
-
-  set alwaysAskBeforeHandling(aNewValue) {
-    if (aNewValue == true)
-      this.element(this._prefSelectedAction).value = "ask";
-    else
-      this.element(this._prefSelectedAction).value = "reader";
-  },
-
-  // Whether or not we are currently storing the action selected by the user.
-  // We use this to suppress notification-triggered updates to the list when
-  // we make changes that may spawn such updates, specifically when we change
-  // the action for the feed type, which results in feed preference updates,
-  // which spawn "pref changed" notifications that would otherwise cause us
-  // to rebuild the view unnecessarily.
-  _storingAction: false,
-
-
-  // nsIMIMEInfo
-
-  get primaryExtension() {
-    return "xml";
-  },
-
-
-  // Storage
-
-  // Changes to the preferred action and handler take effect immediately
-  // (we write them out to the preferences right as they happen),
-  // so we when the controller calls store() after modifying the handlers,
-  // the only thing we need to store is the removal of possible handlers
-  // XXX Should we hold off on making the changes until this method gets called?
-  store() {
-    for (let app of this._possibleApplicationHandlers._removed) {
-      if (app instanceof Ci.nsILocalHandlerApp) {
-        let pref = this.element(PREF_FEED_SELECTED_APP);
-        var preferredAppFile = pref.value;
-        if (preferredAppFile) {
-          let preferredApp = getLocalHandlerApp(preferredAppFile);
-          if (app.equals(preferredApp))
-            pref.reset();
-        }
-      } else {
-        app.QueryInterface(Ci.nsIWebContentHandlerInfo);
-        this._converterSvc.removeContentHandler(app.contentType, app.uri);
-      }
-    }
-    this._possibleApplicationHandlers._removed = [];
-  },
-
-
-  // Icons
-
-  get smallIcon() {
-    return this._smallIcon;
-  }
-
-};
-
-var feedHandlerInfo = {
-  __proto__: new FeedHandlerInfo(TYPE_MAYBE_FEED),
-  _prefSelectedApp: PREF_FEED_SELECTED_APP,
-  _prefSelectedWeb: PREF_FEED_SELECTED_WEB,
-  _prefSelectedAction: PREF_FEED_SELECTED_ACTION,
-  _prefSelectedReader: PREF_FEED_SELECTED_READER,
-  _smallIcon: "chrome://browser/skin/feeds/feedIcon16.png",
-  _appPrefLabel: "webFeed"
-}
-
-var videoFeedHandlerInfo = {
-  __proto__: new FeedHandlerInfo(TYPE_MAYBE_VIDEO_FEED),
-  _prefSelectedApp: PREF_VIDEO_FEED_SELECTED_APP,
-  _prefSelectedWeb: PREF_VIDEO_FEED_SELECTED_WEB,
-  _prefSelectedAction: PREF_VIDEO_FEED_SELECTED_ACTION,
-  _prefSelectedReader: PREF_VIDEO_FEED_SELECTED_READER,
-  _smallIcon: "chrome://browser/skin/feeds/videoFeedIcon16.png",
-  _appPrefLabel: "videoPodcastFeed"
-}
-
-var audioFeedHandlerInfo = {
-  __proto__: new FeedHandlerInfo(TYPE_MAYBE_AUDIO_FEED),
-  _prefSelectedApp: PREF_AUDIO_FEED_SELECTED_APP,
-  _prefSelectedWeb: PREF_AUDIO_FEED_SELECTED_WEB,
-  _prefSelectedAction: PREF_AUDIO_FEED_SELECTED_ACTION,
-  _prefSelectedReader: PREF_AUDIO_FEED_SELECTED_READER,
-  _smallIcon: "chrome://browser/skin/feeds/audioFeedIcon16.png",
-  _appPrefLabel: "audioPodcastFeed"
-}
-
-/**
- * InternalHandlerInfoWrapper provides a basic mechanism to create an internal
- * mime type handler that can be enabled/disabled in the applications preference
- * menu.
- */
-function InternalHandlerInfoWrapper(aMIMEType) {
-  var mimeSvc = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService);
-  var handlerInfo = mimeSvc.getFromTypeAndExtension(aMIMEType, null);
-
-  HandlerInfoWrapper.call(this, aMIMEType, handlerInfo);
-}
-
-InternalHandlerInfoWrapper.prototype = {
-  __proto__: HandlerInfoWrapper.prototype,
-
-  // Override store so we so we can notify any code listening for registration
-  // or unregistration of this handler.
-  store() {
-    HandlerInfoWrapper.prototype.store.call(this);
-    Services.obs.notifyObservers(null, this._handlerChanged);
-  },
-
-  get enabled() {
-    throw Cr.NS_ERROR_NOT_IMPLEMENTED;
-  },
-
-  get description() {
-    return this.element("bundlePreferences").getString(this._appPrefLabel);
-  }
-};
-
-var pdfHandlerInfo = {
-  __proto__: new InternalHandlerInfoWrapper(TYPE_PDF),
-  _handlerChanged: TOPIC_PDFJS_HANDLER_CHANGED,
-  _appPrefLabel: "portableDocumentFormat",
-  get enabled() {
-    return !Services.prefs.getBoolPref(PREF_PDFJS_DISABLED);
-  },
-};
-
-
-// Prefpane Controller
-
-var gApplicationsPane = {
-  // The set of types the app knows how to handle.  A hash of HandlerInfoWrapper
-  // objects, indexed by type.
-  _handledTypes: {},
-
-  // The list of types we can show, sorted by the sort column/direction.
-  // An array of HandlerInfoWrapper objects.  We build this list when we first
-  // load the data and then rebuild it when users change a pref that affects
-  // what types we can show or change the sort column/direction.
-  // Note: this isn't necessarily the list of types we *will* show; if the user
-  // provides a filter string, we'll only show the subset of types in this list
-  // that match that string.
-  _visibleTypes: [],
-
-  // A count of the number of times each visible type description appears.
-  // We use these counts to determine whether or not to annotate descriptions
-  // with their types to distinguish duplicate descriptions from each other.
-  // A hash of integer counts, indexed by string description.
-  _visibleTypeDescriptionCount: {},
-
-
-  // Convenience & Performance Shortcuts
-
-  // These get defined by init().
-  _brandShortName: null,
-  _prefsBundle: null,
-  _list: null,
-  _filter: null,
-
-  _prefSvc: Cc["@mozilla.org/preferences-service;1"].
-            getService(Ci.nsIPrefBranch),
-
-  _mimeSvc: Cc["@mozilla.org/mime;1"].
-            getService(Ci.nsIMIMEService),
-
-  _helperAppSvc: Cc["@mozilla.org/uriloader/external-helper-app-service;1"].
-                 getService(Ci.nsIExternalHelperAppService),
-
-  _handlerSvc: Cc["@mozilla.org/uriloader/handler-service;1"].
-               getService(Ci.nsIHandlerService),
-
-  _ioSvc: Cc["@mozilla.org/network/io-service;1"].
-          getService(Ci.nsIIOService),
-
-
-  // Initialization & Destruction
-
-  init() {
-    function setEventListener(aId, aEventType, aCallback) {
-      document.getElementById(aId)
-              .addEventListener(aEventType, aCallback.bind(gApplicationsPane));
-    }
-
-    // Initialize shortcuts to some commonly accessed elements & values.
-    this._brandShortName =
-      document.getElementById("bundleBrand").getString("brandShortName");
-    this._prefsBundle = document.getElementById("bundlePreferences");
-    this._list = document.getElementById("handlersView");
-    this._filter = document.getElementById("filter");
-
-    // Observe preferences that influence what we display so we can rebuild
-    // the view when they change.
-    this._prefSvc.addObserver(PREF_SHOW_PLUGINS_IN_LIST, this);
-    this._prefSvc.addObserver(PREF_HIDE_PLUGINS_WITHOUT_EXTENSIONS, this);
-    this._prefSvc.addObserver(PREF_FEED_SELECTED_APP, this);
-    this._prefSvc.addObserver(PREF_FEED_SELECTED_WEB, this);
-    this._prefSvc.addObserver(PREF_FEED_SELECTED_ACTION, this);
-    this._prefSvc.addObserver(PREF_FEED_SELECTED_READER, this);
-
-    this._prefSvc.addObserver(PREF_VIDEO_FEED_SELECTED_APP, this);
-    this._prefSvc.addObserver(PREF_VIDEO_FEED_SELECTED_WEB, this);
-    this._prefSvc.addObserver(PREF_VIDEO_FEED_SELECTED_ACTION, this);
-    this._prefSvc.addObserver(PREF_VIDEO_FEED_SELECTED_READER, this);
-
-    this._prefSvc.addObserver(PREF_AUDIO_FEED_SELECTED_APP, this);
-    this._prefSvc.addObserver(PREF_AUDIO_FEED_SELECTED_WEB, this);
-    this._prefSvc.addObserver(PREF_AUDIO_FEED_SELECTED_ACTION, this);
-    this._prefSvc.addObserver(PREF_AUDIO_FEED_SELECTED_READER, this);
-
-
-    setEventListener("focusSearch1", "command", gApplicationsPane.focusFilterBox);
-    setEventListener("focusSearch2", "command", gApplicationsPane.focusFilterBox);
-    setEventListener("filter", "command", gApplicationsPane.filter);
-    setEventListener("handlersView", "select",
-      gApplicationsPane.onSelectionChanged);
-    setEventListener("typeColumn", "click", gApplicationsPane.sort);
-    setEventListener("actionColumn", "click", gApplicationsPane.sort);
-    setEventListener("chooseFolder", "command", gApplicationsPane.chooseFolder);
-    setEventListener("browser.download.dir", "change", gApplicationsPane.displayDownloadDirPref);
-
-    // Listen for window unload so we can remove our preference observers.
-    window.addEventListener("unload", this);
-
-    // Figure out how we should be sorting the list.  We persist sort settings
-    // across sessions, so we can't assume the default sort column/direction.
-    // XXX should we be using the XUL sort service instead?
-    if (document.getElementById("actionColumn").hasAttribute("sortDirection")) {
-      this._sortColumn = document.getElementById("actionColumn");
-      // The typeColumn element always has a sortDirection attribute,
-      // either because it was persisted or because the default value
-      // from the xul file was used.  If we are sorting on the other
-      // column, we should remove it.
-      document.getElementById("typeColumn").removeAttribute("sortDirection");
-    } else
-      this._sortColumn = document.getElementById("typeColumn");
-
-    // Load the data and build the list of handlers.
-    // By doing this in a timeout, we let the preferences dialog resize itself
-    // to an appropriate size before we add a bunch of items to the list.
-    // Otherwise, if there are many items, and the Applications prefpane
-    // is the one that gets displayed when the user first opens the dialog,
-    // the dialog might stretch too much in an attempt to fit them all in.
-    // XXX Shouldn't we perhaps just set a max-height on the richlistbox?
-    var _delayedPaneLoad = function(self) {
-      self._loadData();
-      self._rebuildVisibleTypes();
-      self._sortVisibleTypes();
-      self._rebuildView();
-
-      // Notify observers that the UI is now ready
-      Cc["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService).
-      notifyObservers(window, "app-handler-pane-loaded");
-    }
-    setTimeout(_delayedPaneLoad, 0, this);
-  },
-
-  destroy() {
-    window.removeEventListener("unload", this);
-    this._prefSvc.removeObserver(PREF_SHOW_PLUGINS_IN_LIST, this);
-    this._prefSvc.removeObserver(PREF_HIDE_PLUGINS_WITHOUT_EXTENSIONS, this);
-    this._prefSvc.removeObserver(PREF_FEED_SELECTED_APP, this);
-    this._prefSvc.removeObserver(PREF_FEED_SELECTED_WEB, this);
-    this._prefSvc.removeObserver(PREF_FEED_SELECTED_ACTION, this);
-    this._prefSvc.removeObserver(PREF_FEED_SELECTED_READER, this);
-
-    this._prefSvc.removeObserver(PREF_VIDEO_FEED_SELECTED_APP, this);
-    this._prefSvc.removeObserver(PREF_VIDEO_FEED_SELECTED_WEB, this);
-    this._prefSvc.removeObserver(PREF_VIDEO_FEED_SELECTED_ACTION, this);
-    this._prefSvc.removeObserver(PREF_VIDEO_FEED_SELECTED_READER, this);
-
-    this._prefSvc.removeObserver(PREF_AUDIO_FEED_SELECTED_APP, this);
-    this._prefSvc.removeObserver(PREF_AUDIO_FEED_SELECTED_WEB, this);
-    this._prefSvc.removeObserver(PREF_AUDIO_FEED_SELECTED_ACTION, this);
-    this._prefSvc.removeObserver(PREF_AUDIO_FEED_SELECTED_READER, this);
-  },
-
-
-  // nsISupports
-
-  QueryInterface(aIID) {
-    if (aIID.equals(Ci.nsIObserver) ||
-        aIID.equals(Ci.nsIDOMEventListener ||
-        aIID.equals(Ci.nsISupports)))
-      return this;
-
-    throw Cr.NS_ERROR_NO_INTERFACE;
-  },
-
-
-  // nsIObserver
-
-  observe(aSubject, aTopic, aData) {
-    // Rebuild the list when there are changes to preferences that influence
-    // whether or not to show certain entries in the list.
-    if (aTopic == "nsPref:changed" && !this._storingAction) {
-      // These two prefs alter the list of visible types, so we have to rebuild
-      // that list when they change.
-      if (aData == PREF_SHOW_PLUGINS_IN_LIST ||
-          aData == PREF_HIDE_PLUGINS_WITHOUT_EXTENSIONS) {
-        this._rebuildVisibleTypes();
-        this._sortVisibleTypes();
-      }
-
-      // All the prefs we observe can affect what we display, so we rebuild
-      // the view when any of them changes.
-      this._rebuildView();
-    }
-  },
-
-
-  // nsIDOMEventListener
-
-  handleEvent(aEvent) {
-    if (aEvent.type == "unload") {
-      this.destroy();
-    }
-  },
-
-
-  // Composed Model Construction
-
-  _loadData() {
-    this._loadFeedHandler();
-    this._loadInternalHandlers();
-    this._loadPluginHandlers();
-    this._loadApplicationHandlers();
-  },
-
-  _loadFeedHandler() {
-    this._handledTypes[TYPE_MAYBE_FEED] = feedHandlerInfo;
-    feedHandlerInfo.handledOnlyByPlugin = false;
-
-    this._handledTypes[TYPE_MAYBE_VIDEO_FEED] = videoFeedHandlerInfo;
-    videoFeedHandlerInfo.handledOnlyByPlugin = false;
-
-    this._handledTypes[TYPE_MAYBE_AUDIO_FEED] = audioFeedHandlerInfo;
-    audioFeedHandlerInfo.handledOnlyByPlugin = false;
-  },
-
-  /**
-   * Load higher level internal handlers so they can be turned on/off in the
-   * applications menu.
-   */
-  _loadInternalHandlers() {
-    var internalHandlers = [pdfHandlerInfo];
-    for (let internalHandler of internalHandlers) {
-      if (internalHandler.enabled) {
-        this._handledTypes[internalHandler.type] = internalHandler;
-      }
-    }
-  },
-
-  /**
-   * Load the set of handlers defined by plugins.
-   *
-   * Note: if there's more than one plugin for a given MIME type, we assume
-   * the last one is the one that the application will use.  That may not be
-   * correct, but it's how we've been doing it for years.
-   *
-   * Perhaps we should instead query navigator.mimeTypes for the set of types
-   * supported by the application and then get the plugin from each MIME type's
-   * enabledPlugin property.  But if there's a plugin for a type, we need
-   * to know about it even if it isn't enabled, since we're going to give
-   * the user an option to enable it.
-   *
-   * Also note that enabledPlugin does not get updated when
-   * plugin.disable_full_page_plugin_for_types changes, so even if we could use
-   * enabledPlugin to get the plugin that would be used, we'd still need to
-   * check the pref ourselves to find out if it's enabled.
-   */
-  _loadPluginHandlers() {
-    "use strict";
-
-    let mimeTypes = navigator.mimeTypes;
-
-    for (let mimeType of mimeTypes) {
-      let handlerInfoWrapper;
-      if (mimeType.type in this._handledTypes) {
-        handlerInfoWrapper = this._handledTypes[mimeType.type];
-      } else {
-        let wrappedHandlerInfo =
-              this._mimeSvc.getFromTypeAndExtension(mimeType.type, null);
-        handlerInfoWrapper = new HandlerInfoWrapper(mimeType.type, wrappedHandlerInfo);
-        handlerInfoWrapper.handledOnlyByPlugin = true;
-        this._handledTypes[mimeType.type] = handlerInfoWrapper;
-      }
-      handlerInfoWrapper.pluginName = mimeType.enabledPlugin.name;
-    }
-  },
-
-  /**
-   * Load the set of handlers defined by the application datastore.
-   */
-  _loadApplicationHandlers() {
-    var wrappedHandlerInfos = this._handlerSvc.enumerate();
-    while (wrappedHandlerInfos.hasMoreElements()) {
-      let wrappedHandlerInfo =
-        wrappedHandlerInfos.getNext().QueryInterface(Ci.nsIHandlerInfo);
-      let type = wrappedHandlerInfo.type;
-
-      let handlerInfoWrapper;
-      if (type in this._handledTypes)
-        handlerInfoWrapper = this._handledTypes[type];
-      else {
-        handlerInfoWrapper = new HandlerInfoWrapper(type, wrappedHandlerInfo);
-        this._handledTypes[type] = handlerInfoWrapper;
-      }
-
-      handlerInfoWrapper.handledOnlyByPlugin = false;
-    }
-  },
-
-
-  // View Construction
-
-  _rebuildVisibleTypes() {
-    // Reset the list of visible types and the visible type description counts.
-    this._visibleTypes = [];
-    this._visibleTypeDescriptionCount = {};
-
-    // Get the preferences that help determine what types to show.
-    var showPlugins = this._prefSvc.getBoolPref(PREF_SHOW_PLUGINS_IN_LIST);
-    var hidePluginsWithoutExtensions =
-      this._prefSvc.getBoolPref(PREF_HIDE_PLUGINS_WITHOUT_EXTENSIONS);
-
-    for (let type in this._handledTypes) {
-      let handlerInfo = this._handledTypes[type];
-
-      // Hide plugins without associated extensions if so prefed so we don't
-      // show a whole bunch of obscure types handled by plugins on Mac.
-      // Note: though protocol types don't have extensions, we still show them;
-      // the pref is only meant to be applied to MIME types, since plugins are
-      // only associated with MIME types.
-      // FIXME: should we also check the "suffixes" property of the plugin?
-      // Filed as bug 395135.
-      if (hidePluginsWithoutExtensions && handlerInfo.handledOnlyByPlugin &&
-          handlerInfo.wrappedHandlerInfo instanceof Ci.nsIMIMEInfo &&
-          !handlerInfo.primaryExtension)
-        continue;
-
-      // Hide types handled only by plugins if so prefed.
-      if (handlerInfo.handledOnlyByPlugin && !showPlugins)
-        continue;
-
-      // We couldn't find any reason to exclude the type, so include it.
-      this._visibleTypes.push(handlerInfo);
-
-      if (handlerInfo.description in this._visibleTypeDescriptionCount)
-        this._visibleTypeDescriptionCount[handlerInfo.description]++;
-      else
-        this._visibleTypeDescriptionCount[handlerInfo.description] = 1;
-    }
-  },
-
-  _rebuildView() {
-    // Clear the list of entries.
-    while (this._list.childNodes.length > 1)
-      this._list.removeChild(this._list.lastChild);
-
-    var visibleTypes = this._visibleTypes;
-
-    // If the user is filtering the list, then only show matching types.
-    if (this._filter.value)
-      visibleTypes = visibleTypes.filter(this._matchesFilter, this);
-
-    for (let visibleType of visibleTypes) {
-      let item = document.createElement("richlistitem");
-      item.setAttribute("type", visibleType.type);
-      item.setAttribute("typeDescription", this._describeType(visibleType));
-      if (visibleType.smallIcon)
-        item.setAttribute("typeIcon", visibleType.smallIcon);
-      item.setAttribute("actionDescription",
-                        this._describePreferredAction(visibleType));
-
-      if (!this._setIconClassForPreferredAction(visibleType, item)) {
-        item.setAttribute("actionIcon",
-                          this._getIconURLForPreferredAction(visibleType));
-      }
-
-      this._list.appendChild(item);
-    }
-
-    this._selectLastSelectedType();
-  },
-
-  _matchesFilter(aType) {
-    var filterValue = this._filter.value.toLowerCase();
-    return this._describeType(aType).toLowerCase().indexOf(filterValue) != -1 ||
-           this._describePreferredAction(aType).toLowerCase().indexOf(filterValue) != -1;
-  },
-
-  /**
-   * Describe, in a human-readable fashion, the type represented by the given
-   * handler info object.  Normally this is just the description provided by
-   * the info object, but if more than one object presents the same description,
-   * then we annotate the duplicate descriptions with the type itself to help
-   * users distinguish between those types.
-   *
-   * @param aHandlerInfo {nsIHandlerInfo} the type being described
-   * @returns {string} a description of the type
-   */
-  _describeType(aHandlerInfo) {
-    if (this._visibleTypeDescriptionCount[aHandlerInfo.description] > 1)
-      return this._prefsBundle.getFormattedString("typeDescriptionWithType",
-                                                  [aHandlerInfo.description,
-                                                   aHandlerInfo.type]);
-
-    return aHandlerInfo.description;
-  },
-
-  /**
-   * Describe, in a human-readable fashion, the preferred action to take on
-   * the type represented by the given handler info object.
-   *
-   * XXX Should this be part of the HandlerInfoWrapper interface?  It would
-   * violate the separation of model and view, but it might make more sense
-   * nonetheless (f.e. it would make sortTypes easier).
-   *
-   * @param aHandlerInfo {nsIHandlerInfo} the type whose preferred action
-   *                                      is being described
-   * @returns {string} a description of the action
-   */
-  _describePreferredAction(aHandlerInfo) {
-    // alwaysAskBeforeHandling overrides the preferred action, so if that flag
-    // is set, then describe that behavior instead.  For most types, this is
-    // the "alwaysAsk" string, but for the feed type we show something special.
-    if (aHandlerInfo.alwaysAskBeforeHandling) {
-      if (isFeedType(aHandlerInfo.type))
-        return this._prefsBundle.getFormattedString("previewInApp",
-                                                    [this._brandShortName]);
-      return this._prefsBundle.getString("alwaysAsk");
-    }
-
-    switch (aHandlerInfo.preferredAction) {
-      case Ci.nsIHandlerInfo.saveToDisk:
-        return this._prefsBundle.getString("saveFile");
-
-      case Ci.nsIHandlerInfo.useHelperApp:
-        var preferredApp = aHandlerInfo.preferredApplicationHandler;
-        var name;
-        if (preferredApp instanceof Ci.nsILocalHandlerApp)
-          name = getFileDisplayName(preferredApp.executable);
-        else
-          name = preferredApp.name;
-        return this._prefsBundle.getFormattedString("useApp", [name]);
-
-      case Ci.nsIHandlerInfo.handleInternally:
-        // For the feed type, handleInternally means live bookmarks.
-        if (isFeedType(aHandlerInfo.type)) {
-          return this._prefsBundle.getFormattedString("addLiveBookmarksInApp",
-                                                      [this._brandShortName]);
-        }
-
-        if (aHandlerInfo instanceof InternalHandlerInfoWrapper) {
-          return this._prefsBundle.getFormattedString("previewInApp",
-                                                      [this._brandShortName]);
-        }
-
-        // For other types, handleInternally looks like either useHelperApp
-        // or useSystemDefault depending on whether or not there's a preferred
-        // handler app.
-        if (this.isValidHandlerApp(aHandlerInfo.preferredApplicationHandler))
-          return aHandlerInfo.preferredApplicationHandler.name;
-
-        return aHandlerInfo.defaultDescription;
-
-        // XXX Why don't we say the app will handle the type internally?
-        // Is it because the app can't actually do that?  But if that's true,
-        // then why would a preferredAction ever get set to this value
-        // in the first place?
-
-      case Ci.nsIHandlerInfo.useSystemDefault:
-        return this._prefsBundle.getFormattedString("useDefault",
-                                                    [aHandlerInfo.defaultDescription]);
-
-      case kActionUsePlugin:
-        return this._prefsBundle.getFormattedString("usePluginIn",
-                                                    [aHandlerInfo.pluginName,
-                                                     this._brandShortName]);
-      default:
-        throw new Error(`Unexpected preferredAction: ${aHandlerInfo.preferredAction}`);
-    }
-  },
-
-  _selectLastSelectedType() {
-    // If the list is disabled by the pref.downloads.disable_button.edit_actions
-    // preference being locked, then don't select the type, as that would cause
-    // it to appear selected, with a different background and an actions menu
-    // that makes it seem like you can choose an action for the type.
-    if (this._list.disabled)
-      return;
-
-    var lastSelectedType = this._list.getAttribute("lastSelectedType");
-    if (!lastSelectedType)
-      return;
-
-    var item = this._list.getElementsByAttribute("type", lastSelectedType)[0];
-    if (!item)
-      return;
-
-    this._list.selectedItem = item;
-  },
-
-  /**
-   * Whether or not the given handler app is valid.
-   *
-   * @param aHandlerApp {nsIHandlerApp} the handler app in question
-   *
-   * @returns {boolean} whether or not it's valid
-   */
-  isValidHandlerApp(aHandlerApp) {
-    if (!aHandlerApp)
-      return false;
-
-    if (aHandlerApp instanceof Ci.nsILocalHandlerApp)
-      return this._isValidHandlerExecutable(aHandlerApp.executable);
-
-    if (aHandlerApp instanceof Ci.nsIWebHandlerApp)
-      return aHandlerApp.uriTemplate;
-
-    if (aHandlerApp instanceof Ci.nsIWebContentHandlerInfo)
-      return aHandlerApp.uri;
-
-    return false;
-  },
-
-  _isValidHandlerExecutable(aExecutable) {
-    let leafName;
-    if (AppConstants.platform == "win") {
-      leafName = `${AppConstants.MOZ_APP_NAME}.exe`;
-    } else if (AppConstants.platform == "macosx") {
-      leafName = AppConstants.MOZ_MACBUNDLE_NAME;
-    } else {
-      leafName = `${AppConstants.MOZ_APP_NAME}-bin`;
-    }
-    return aExecutable &&
-           aExecutable.exists() &&
-           aExecutable.isExecutable() &&
-// XXXben - we need to compare this with the running instance executable
-//          just don't know how to do that via script...
-// XXXmano TBD: can probably add this to nsIShellService
-           aExecutable.leafName != leafName;
-  },
-
-  /**
-   * Rebuild the actions menu for the selected entry.  Gets called by
-   * the richlistitem constructor when an entry in the list gets selected.
-   */
-  rebuildActionsMenu() {
-    var typeItem = this._list.selectedItem;
-    var handlerInfo = this._handledTypes[typeItem.type];
-    var menu =
-      document.getAnonymousElementByAttribute(typeItem, "class", "actionsMenu");
-    var menuPopup = menu.menupopup;
-
-    // Clear out existing items.
-    while (menuPopup.hasChildNodes())
-      menuPopup.removeChild(menuPopup.lastChild);
-
-    let internalMenuItem;
-    // Add the "Preview in Firefox" option for optional internal handlers.
-    if (handlerInfo instanceof InternalHandlerInfoWrapper) {
-      internalMenuItem = document.createElement("menuitem");
-      internalMenuItem.setAttribute("action", Ci.nsIHandlerInfo.handleInternally);
-      let label = this._prefsBundle.getFormattedString("previewInApp",
-                                                       [this._brandShortName]);
-      internalMenuItem.setAttribute("label", label);
-      internalMenuItem.setAttribute("tooltiptext", label);
-      internalMenuItem.setAttribute(APP_ICON_ATTR_NAME, "ask");
-      menuPopup.appendChild(internalMenuItem);
-    }
-
-    {
-      var askMenuItem = document.createElement("menuitem");
-      askMenuItem.setAttribute("action", Ci.nsIHandlerInfo.alwaysAsk);
-      let label;
-      if (isFeedType(handlerInfo.type))
-        label = this._prefsBundle.getFormattedString("previewInApp",
-                                                     [this._brandShortName]);
-      else
-        label = this._prefsBundle.getString("alwaysAsk");
-      askMenuItem.setAttribute("label", label);
-      askMenuItem.setAttribute("tooltiptext", label);
-      askMenuItem.setAttribute(APP_ICON_ATTR_NAME, "ask");
-      menuPopup.appendChild(askMenuItem);
-    }
-
-    // Create a menu item for saving to disk.
-    // Note: this option isn't available to protocol types, since we don't know
-    // what it means to save a URL having a certain scheme to disk, nor is it
-    // available to feeds, since the feed code doesn't implement the capability.
-    if ((handlerInfo.wrappedHandlerInfo instanceof Ci.nsIMIMEInfo) &&
-        !isFeedType(handlerInfo.type)) {
-      var saveMenuItem = document.createElement("menuitem");
-      saveMenuItem.setAttribute("action", Ci.nsIHandlerInfo.saveToDisk);
-      let label = this._prefsBundle.getString("saveFile");
-      saveMenuItem.setAttribute("label", label);
-      saveMenuItem.setAttribute("tooltiptext", label);
-      saveMenuItem.setAttribute(APP_ICON_ATTR_NAME, "save");
-      menuPopup.appendChild(saveMenuItem);
-    }
-
-    // If this is the feed type, add a Live Bookmarks item.
-    if (isFeedType(handlerInfo.type)) {
-      internalMenuItem = document.createElement("menuitem");
-      internalMenuItem.setAttribute("action", Ci.nsIHandlerInfo.handleInternally);
-      let label = this._prefsBundle.getFormattedString("addLiveBookmarksInApp",
-                                                       [this._brandShortName]);
-      internalMenuItem.setAttribute("label", label);
-      internalMenuItem.setAttribute("tooltiptext", label);
-      internalMenuItem.setAttribute(APP_ICON_ATTR_NAME, "feed");
-      menuPopup.appendChild(internalMenuItem);
-    }
-
-    // Add a separator to distinguish these items from the helper app items
-    // that follow them.
-    let menuseparator = document.createElement("menuseparator");
-    menuPopup.appendChild(menuseparator);
-
-    // Create a menu item for the OS default application, if any.
-    if (handlerInfo.hasDefaultHandler) {
-      var defaultMenuItem = document.createElement("menuitem");
-      defaultMenuItem.setAttribute("action", Ci.nsIHandlerInfo.useSystemDefault);
-      let label = this._prefsBundle.getFormattedString("useDefault",
-                                                       [handlerInfo.defaultDescription]);
-      defaultMenuItem.setAttribute("label", label);
-      defaultMenuItem.setAttribute("tooltiptext", handlerInfo.defaultDescription);
-      defaultMenuItem.setAttribute("image", this._getIconURLForSystemDefault(handlerInfo));
-
-      menuPopup.appendChild(defaultMenuItem);
-    }
-
-    // Create menu items for possible handlers.
-    let preferredApp = handlerInfo.preferredApplicationHandler;
-    let possibleApps = handlerInfo.possibleApplicationHandlers.enumerate();
-    var possibleAppMenuItems = [];
-    while (possibleApps.hasMoreElements()) {
-      let possibleApp = possibleApps.getNext();
-      if (!this.isValidHandlerApp(possibleApp))
-        continue;
-
-      let menuItem = document.createElement("menuitem");
-      menuItem.setAttribute("action", Ci.nsIHandlerInfo.useHelperApp);
-      let label;
-      if (possibleApp instanceof Ci.nsILocalHandlerApp)
-        label = getFileDisplayName(possibleApp.executable);
-      else
-        label = possibleApp.name;
-      label = this._prefsBundle.getFormattedString("useApp", [label]);
-      menuItem.setAttribute("label", label);
-      menuItem.setAttribute("tooltiptext", label);
-      menuItem.setAttribute("image", this._getIconURLForHandlerApp(possibleApp));
-
-      // Attach the handler app object to the menu item so we can use it
-      // to make changes to the datastore when the user selects the item.
-      menuItem.handlerApp = possibleApp;
-
-      menuPopup.appendChild(menuItem);
-      possibleAppMenuItems.push(menuItem);
-    }
-
-    // Create a menu item for the plugin.
-    if (handlerInfo.pluginName) {
-      var pluginMenuItem = document.createElement("menuitem");
-      pluginMenuItem.setAttribute("action", kActionUsePlugin);
-      let label = this._prefsBundle.getFormattedString("usePluginIn",
-                                                       [handlerInfo.pluginName,
-                                                        this._brandShortName]);
-      pluginMenuItem.setAttribute("label", label);
-      pluginMenuItem.setAttribute("tooltiptext", label);
-      pluginMenuItem.setAttribute(APP_ICON_ATTR_NAME, "plugin");
-      menuPopup.appendChild(pluginMenuItem);
-    }
-
-    // Create a menu item for selecting a local application.
-    let canOpenWithOtherApp = true;
-    if (AppConstants.platform == "win") {
-      // On Windows, selecting an application to open another application
-      // would be meaningless so we special case executables.
-      let executableType = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService)
-                                                    .getTypeFromExtension("exe");
-      canOpenWithOtherApp = handlerInfo.type != executableType;
-    }
-    if (canOpenWithOtherApp) {
-      let menuItem = document.createElement("menuitem");
-      menuItem.className = "choose-app-item";
-      menuItem.addEventListener("command", function(e) {
-        gApplicationsPane.chooseApp(e);
-      });
-      let label = this._prefsBundle.getString("useOtherApp");
-      menuItem.setAttribute("label", label);
-      menuItem.setAttribute("tooltiptext", label);
-      menuPopup.appendChild(menuItem);
-    }
-
-    // Create a menu item for managing applications.
-    if (possibleAppMenuItems.length) {
-      let menuItem = document.createElement("menuseparator");
-      menuPopup.appendChild(menuItem);
-      menuItem = document.createElement("menuitem");
-      menuItem.className = "manage-app-item";
-      menuItem.addEventListener("command", function(e) {
-        gApplicationsPane.manageApp(e);
-      });
-      menuItem.setAttribute("label", this._prefsBundle.getString("manageApp"));
-      menuPopup.appendChild(menuItem);
-    }
-
-    // Select the item corresponding to the preferred action.  If the always
-    // ask flag is set, it overrides the preferred action.  Otherwise we pick
-    // the item identified by the preferred action (when the preferred action
-    // is to use a helper app, we have to pick the specific helper app item).
-    if (handlerInfo.alwaysAskBeforeHandling)
-      menu.selectedItem = askMenuItem;
-    else switch (handlerInfo.preferredAction) {
-      case Ci.nsIHandlerInfo.handleInternally:
-        if (internalMenuItem) {
-          menu.selectedItem = internalMenuItem;
-        } else {
-          Cu.reportError("No menu item defined to set!")
-        }
-        break;
-      case Ci.nsIHandlerInfo.useSystemDefault:
-        menu.selectedItem = defaultMenuItem;
-        break;
-      case Ci.nsIHandlerInfo.useHelperApp:
-        if (preferredApp)
-          menu.selectedItem =
-            possibleAppMenuItems.filter(v => v.handlerApp.equals(preferredApp))[0];
-        break;
-      case kActionUsePlugin:
-        menu.selectedItem = pluginMenuItem;
-        break;
-      case Ci.nsIHandlerInfo.saveToDisk:
-        menu.selectedItem = saveMenuItem;
-        break;
-    }
-  },
-
-
-  // Sorting & Filtering
-
-  _sortColumn: null,
-
-  /**
-   * Sort the list when the user clicks on a column header.
-   */
-  sort(event) {
-    var column = event.target;
-
-    // If the user clicked on a new sort column, remove the direction indicator
-    // from the old column.
-    if (this._sortColumn && this._sortColumn != column)
-      this._sortColumn.removeAttribute("sortDirection");
-
-    this._sortColumn = column;
-
-    // Set (or switch) the sort direction indicator.
-    if (column.getAttribute("sortDirection") == "ascending")
-      column.setAttribute("sortDirection", "descending");
-    else
-      column.setAttribute("sortDirection", "ascending");
-
-    this._sortVisibleTypes();
-    this._rebuildView();
-  },
-
-  /**
-   * Sort the list of visible types by the current sort column/direction.
-   */
-  _sortVisibleTypes() {
-    if (!this._sortColumn)
-      return;
-
-    var t = this;
-
-    function sortByType(a, b) {
-      return t._describeType(a).toLowerCase().
-             localeCompare(t._describeType(b).toLowerCase());
-    }
-
-    function sortByAction(a, b) {
-      return t._describePreferredAction(a).toLowerCase().
-             localeCompare(t._describePreferredAction(b).toLowerCase());
-    }
-
-    switch (this._sortColumn.getAttribute("value")) {
-      case "type":
-        this._visibleTypes.sort(sortByType);
-        break;
-      case "action":
-        this._visibleTypes.sort(sortByAction);
-        break;
-    }
-
-    if (this._sortColumn.getAttribute("sortDirection") == "descending")
-      this._visibleTypes.reverse();
-  },
-
-  /**
-   * Filter the list when the user enters a filter term into the filter field.
-   */
-  filter() {
-    this._rebuildView();
-  },
-
-  focusFilterBox() {
-    this._filter.focus();
-    this._filter.select();
-  },
-
-
-  // Changes
-
-  onSelectAction(aActionItem) {
-    this._storingAction = true;
-
-    try {
-      this._storeAction(aActionItem);
-    } finally {
-      this._storingAction = false;
-    }
-  },
-
-  _storeAction(aActionItem) {
-    var typeItem = this._list.selectedItem;
-    var handlerInfo = this._handledTypes[typeItem.type];
-
-    let action = parseInt(aActionItem.getAttribute("action"));
-
-    // Set the plugin state if we're enabling or disabling a plugin.
-    if (action == kActionUsePlugin)
-      handlerInfo.enablePluginType();
-    else if (handlerInfo.pluginName && !handlerInfo.isDisabledPluginType)
-      handlerInfo.disablePluginType();
-
-    // Set the preferred application handler.
-    // We leave the existing preferred app in the list when we set
-    // the preferred action to something other than useHelperApp so that
-    // legacy datastores that don't have the preferred app in the list
-    // of possible apps still include the preferred app in the list of apps
-    // the user can choose to handle the type.
-    if (action == Ci.nsIHandlerInfo.useHelperApp)
-      handlerInfo.preferredApplicationHandler = aActionItem.handlerApp;
-
-    // Set the "always ask" flag.
-    if (action == Ci.nsIHandlerInfo.alwaysAsk)
-      handlerInfo.alwaysAskBeforeHandling = true;
-    else
-      handlerInfo.alwaysAskBeforeHandling = false;
-
-    // Set the preferred action.
-    handlerInfo.preferredAction = action;
-
-    handlerInfo.store();
-
-    // Make sure the handler info object is flagged to indicate that there is
-    // now some user configuration for the type.
-    handlerInfo.handledOnlyByPlugin = false;
-
-    // Update the action label and image to reflect the new preferred action.
-    typeItem.setAttribute("actionDescription",
-                          this._describePreferredAction(handlerInfo));
-    if (!this._setIconClassForPreferredAction(handlerInfo, typeItem)) {
-      typeItem.setAttribute("actionIcon",
-                            this._getIconURLForPreferredAction(handlerInfo));
-    }
-  },
-
-  manageApp(aEvent) {
-    // Don't let the normal "on select action" handler get this event,
-    // as we handle it specially ourselves.
-    aEvent.stopPropagation();
-
-    var typeItem = this._list.selectedItem;
-    var handlerInfo = this._handledTypes[typeItem.type];
-
-    let onComplete = () => {
-      // Rebuild the actions menu so that we revert to the previous selection,
-      // or "Always ask" if the previous default application has been removed
-      this.rebuildActionsMenu();
-
-      // update the richlistitem too. Will be visible when selecting another row
-      typeItem.setAttribute("actionDescription",
-                            this._describePreferredAction(handlerInfo));
-      if (!this._setIconClassForPreferredAction(handlerInfo, typeItem)) {
-        typeItem.setAttribute("actionIcon",
-                              this._getIconURLForPreferredAction(handlerInfo));
-      }
-    };
-
-    gSubDialog.open("chrome://browser/content/preferences/applicationManager.xul",
-                    "resizable=no", handlerInfo, onComplete);
-
-  },
-
-  chooseApp(aEvent) {
-    // Don't let the normal "on select action" handler get this event,
-    // as we handle it specially ourselves.
-    aEvent.stopPropagation();
-
-    var handlerApp;
-    let chooseAppCallback = aHandlerApp => {
-      // Rebuild the actions menu whether the user picked an app or canceled.
-      // If they picked an app, we want to add the app to the menu and select it.
-      // If they canceled, we want to go back to their previous selection.
-      this.rebuildActionsMenu();
-
-      // If the user picked a new app from the menu, select it.
-      if (aHandlerApp) {
-        let typeItem = this._list.selectedItem;
-        let actionsMenu =
-          document.getAnonymousElementByAttribute(typeItem, "class", "actionsMenu");
-        let menuItems = actionsMenu.menupopup.childNodes;
-        for (let i = 0; i < menuItems.length; i++) {
-          let menuItem = menuItems[i];
-          if (menuItem.handlerApp && menuItem.handlerApp.equals(aHandlerApp)) {
-            actionsMenu.selectedIndex = i;
-            this.onSelectAction(menuItem);
-            break;
-          }
-        }
-      }
-    };
-
-    if (AppConstants.platform == "win") {
-      var params = {};
-      var handlerInfo = this._handledTypes[this._list.selectedItem.type];
-
-      if (isFeedType(handlerInfo.type)) {
-        // MIME info will be null, create a temp object.
-        params.mimeInfo = this._mimeSvc.getFromTypeAndExtension(handlerInfo.type,
-                                                   handlerInfo.primaryExtension);
-      } else {
-        params.mimeInfo = handlerInfo.wrappedHandlerInfo;
-      }
-
-      params.title         = this._prefsBundle.getString("fpTitleChooseApp");
-      params.description   = handlerInfo.description;
-      params.filename      = null;
-      params.handlerApp    = null;
-
-      let onAppSelected = () => {
-        if (this.isValidHandlerApp(params.handlerApp)) {
-          handlerApp = params.handlerApp;
-
-          // Add the app to the type's list of possible handlers.
-          handlerInfo.addPossibleApplicationHandler(handlerApp);
-        }
-
-        chooseAppCallback(handlerApp);
-      };
-
-      gSubDialog.open("chrome://global/content/appPicker.xul",
-                      null, params, onAppSelected);
-    } else {
-      let winTitle = this._prefsBundle.getString("fpTitleChooseApp");
-      let fp = Cc["@mozilla.org/filepicker;1"].createInstance(Ci.nsIFilePicker);
-      let fpCallback = aResult => {
-        if (aResult == Ci.nsIFilePicker.returnOK && fp.file &&
-            this._isValidHandlerExecutable(fp.file)) {
-          handlerApp = Cc["@mozilla.org/uriloader/local-handler-app;1"].
-                       createInstance(Ci.nsILocalHandlerApp);
-          handlerApp.name = getFileDisplayName(fp.file);
-          handlerApp.executable = fp.file;
-
-          // Add the app to the type's list of possible handlers.
-          let handler = this._handledTypes[this._list.selectedItem.type];
-          handler.addPossibleApplicationHandler(handlerApp);
-
-          chooseAppCallback(handlerApp);
-        }
-      };
-
-      // Prompt the user to pick an app.  If they pick one, and it's a valid
-      // selection, then add it to the list of possible handlers.
-      fp.init(window, winTitle, Ci.nsIFilePicker.modeOpen);
-      fp.appendFilters(Ci.nsIFilePicker.filterApps);
-      fp.open(fpCallback);
-    }
-  },
-
-  // Mark which item in the list was last selected so we can reselect it
-  // when we rebuild the list or when the user returns to the prefpane.
-  onSelectionChanged() {
-    if (this._list.selectedItem)
-      this._list.setAttribute("lastSelectedType",
-                              this._list.selectedItem.getAttribute("type"));
-  },
-
-  _setIconClassForPreferredAction(aHandlerInfo, aElement) {
-    // If this returns true, the attribute that CSS sniffs for was set to something
-    // so you shouldn't manually set an icon URI.
-    // This removes the existing actionIcon attribute if any, even if returning false.
-    aElement.removeAttribute("actionIcon");
-
-    if (aHandlerInfo.alwaysAskBeforeHandling) {
-      aElement.setAttribute(APP_ICON_ATTR_NAME, "ask");
-      return true;
-    }
-
-    switch (aHandlerInfo.preferredAction) {
-      case Ci.nsIHandlerInfo.saveToDisk:
-        aElement.setAttribute(APP_ICON_ATTR_NAME, "save");
-        return true;
-
-      case Ci.nsIHandlerInfo.handleInternally:
-        if (isFeedType(aHandlerInfo.type)) {
-          aElement.setAttribute(APP_ICON_ATTR_NAME, "feed");
-          return true;
-        } else if (aHandlerInfo instanceof InternalHandlerInfoWrapper) {
-          aElement.setAttribute(APP_ICON_ATTR_NAME, "ask");
-          return true;
-        }
-        break;
-
-      case kActionUsePlugin:
-        aElement.setAttribute(APP_ICON_ATTR_NAME, "plugin");
-        return true;
-    }
-    aElement.removeAttribute(APP_ICON_ATTR_NAME);
-    return false;
-  },
-
-  _getIconURLForPreferredAction(aHandlerInfo) {
-    switch (aHandlerInfo.preferredAction) {
-      case Ci.nsIHandlerInfo.useSystemDefault:
-        return this._getIconURLForSystemDefault(aHandlerInfo);
-
-      case Ci.nsIHandlerInfo.useHelperApp:
-        let preferredApp = aHandlerInfo.preferredApplicationHandler;
-        if (this.isValidHandlerApp(preferredApp))
-          return this._getIconURLForHandlerApp(preferredApp);
-        // Explicit fall-through
-
-      // This should never happen, but if preferredAction is set to some weird
-      // value, then fall back to the generic application icon.
-      default:
-        return ICON_URL_APP;
-    }
-  },
-
-  _getIconURLForHandlerApp(aHandlerApp) {
-    if (aHandlerApp instanceof Ci.nsILocalHandlerApp)
-      return this._getIconURLForFile(aHandlerApp.executable);
-
-    if (aHandlerApp instanceof Ci.nsIWebHandlerApp)
-      return this._getIconURLForWebApp(aHandlerApp.uriTemplate);
-
-    if (aHandlerApp instanceof Ci.nsIWebContentHandlerInfo)
-      return this._getIconURLForWebApp(aHandlerApp.uri)
-
-    // We know nothing about other kinds of handler apps.
-    return "";
-  },
-
-  _getIconURLForFile(aFile) {
-    var fph = this._ioSvc.getProtocolHandler("file").
-              QueryInterface(Ci.nsIFileProtocolHandler);
-    var urlSpec = fph.getURLSpecFromFile(aFile);
-
-    return "moz-icon://" + urlSpec + "?size=16";
-  },
-
-  _getIconURLForWebApp(aWebAppURITemplate) {
-    var uri = this._ioSvc.newURI(aWebAppURITemplate);
-
-    // Unfortunately we can't use the favicon service to get the favicon,
-    // because the service looks in the annotations table for a record with
-    // the exact URL we give it, and users won't have such records for URLs
-    // they don't visit, and users won't visit the web app's URL template,
-    // they'll only visit URLs derived from that template (i.e. with %s
-    // in the template replaced by the URL of the content being handled).
-
-    if (/^https?$/.test(uri.scheme) && this._prefSvc.getBoolPref("browser.chrome.favicons"))
-      return uri.prePath + "/favicon.ico";
-
-    return "";
-  },
-
-  _getIconURLForSystemDefault(aHandlerInfo) {
-    // Handler info objects for MIME types on some OSes implement a property bag
-    // interface from which we can get an icon for the default app, so if we're
-    // dealing with a MIME type on one of those OSes, then try to get the icon.
-    if ("wrappedHandlerInfo" in aHandlerInfo) {
-      let wrappedHandlerInfo = aHandlerInfo.wrappedHandlerInfo;
-
-      if (wrappedHandlerInfo instanceof Ci.nsIMIMEInfo &&
-          wrappedHandlerInfo instanceof Ci.nsIPropertyBag) {
-        try {
-          let url = wrappedHandlerInfo.getProperty("defaultApplicationIconURL");
-          if (url)
-            return url + "?size=16";
-        } catch (ex) {}
-      }
-    }
-
-    // If this isn't a MIME type object on an OS that supports retrieving
-    // the icon, or if we couldn't retrieve the icon for some other reason,
-    // then use a generic icon.
-    return ICON_URL_APP;
-  },
-
-  // DOWNLOADS
-
-  /*
-   * Preferences:
-   *
-   * browser.download.useDownloadDir - bool
-   *   True - Save files directly to the folder configured via the
-   *   browser.download.folderList preference.
-   *   False - Always ask the user where to save a file and default to
-   *   browser.download.lastDir when displaying a folder picker dialog.
-   * browser.download.dir - local file handle
-   *   A local folder the user may have selected for downloaded files to be
-   *   saved. Migration of other browser settings may also set this path.
-   *   This folder is enabled when folderList equals 2.
-   * browser.download.lastDir - local file handle
-   *   May contain the last folder path accessed when the user browsed
-   *   via the file save-as dialog. (see contentAreaUtils.js)
-   * browser.download.folderList - int
-   *   Indicates the location users wish to save downloaded files too.
-   *   It is also used to display special file labels when the default
-   *   download location is either the Desktop or the Downloads folder.
-   *   Values:
-   *     0 - The desktop is the default download location.
-   *     1 - The system's downloads folder is the default download location.
-   *     2 - The default download location is elsewhere as specified in
-   *         browser.download.dir.
-   * browser.download.downloadDir
-   *   deprecated.
-   * browser.download.defaultFolder
-   *   deprecated.
-   */
-
-  /**
-   * Enables/disables the folder field and Browse button based on whether a
-   * default download directory is being used.
-   */
-  readUseDownloadDir() {
-    var downloadFolder = document.getElementById("downloadFolder");
-    var chooseFolder = document.getElementById("chooseFolder");
-    var preference = document.getElementById("browser.download.useDownloadDir");
-    downloadFolder.disabled = !preference.value || preference.locked;
-    chooseFolder.disabled = !preference.value || preference.locked;
-
-    // don't override the preference's value in UI
-    return undefined;
-  },
-
-  /**
-   * Displays a file picker in which the user can choose the location where
-   * downloads are automatically saved, updating preferences and UI in
-   * response to the choice, if one is made.
-   */
-  chooseFolder() {
-    return this.chooseFolderTask().catch(Components.utils.reportError);
-  },
-  async chooseFolderTask() {
-    let bundlePreferences = document.getElementById("bundlePreferences");
-    let title = bundlePreferences.getString("chooseDownloadFolderTitle");
-    let folderListPref = document.getElementById("browser.download.folderList");
-    let currentDirPref = await this._indexToFolder(folderListPref.value);
-    let defDownloads = await this._indexToFolder(1);
-    let fp = Components.classes["@mozilla.org/filepicker;1"].
-             createInstance(Components.interfaces.nsIFilePicker);
-
-    fp.init(window, title, Components.interfaces.nsIFilePicker.modeGetFolder);
-    fp.appendFilters(Components.interfaces.nsIFilePicker.filterAll);
-    // First try to open what's currently configured
-    if (currentDirPref && currentDirPref.exists()) {
-      fp.displayDirectory = currentDirPref;
-    } else if (defDownloads && defDownloads.exists()) {
-      // Try the system's download dir
-      fp.displayDirectory = defDownloads;
-    } else {
-      // Fall back to Desktop
-      fp.displayDirectory = await this._indexToFolder(0);
-    }
-
-    let result = await new Promise(resolve => fp.open(resolve));
-    if (result != Components.interfaces.nsIFilePicker.returnOK) {
-      return;
-    }
-
-    let downloadDirPref = document.getElementById("browser.download.dir");
-    downloadDirPref.value = fp.file;
-    folderListPref.value = await this._folderToIndex(fp.file);
-    // Note, the real prefs will not be updated yet, so dnld manager's
-    // userDownloadsDirectory may not return the right folder after
-    // this code executes. displayDownloadDirPref will be called on
-    // the assignment above to update the UI.
-  },
-
-  /**
-   * Initializes the download folder display settings based on the user's
-   * preferences.
-   */
-  displayDownloadDirPref() {
-    this.displayDownloadDirPrefTask().catch(Components.utils.reportError);
-
-    // don't override the preference's value in UI
-    return undefined;
-  },
-
-  async displayDownloadDirPrefTask() {
-    var folderListPref = document.getElementById("browser.download.folderList");
-    var bundlePreferences = document.getElementById("bundlePreferences");
-    var downloadFolder = document.getElementById("downloadFolder");
-    var currentDirPref = document.getElementById("browser.download.dir");
-
-    // Used in defining the correct path to the folder icon.
-    var ios = Components.classes["@mozilla.org/network/io-service;1"]
-                        .getService(Components.interfaces.nsIIOService);
-    var fph = ios.getProtocolHandler("file")
-                 .QueryInterface(Components.interfaces.nsIFileProtocolHandler);
-    var iconUrlSpec;
-
-    // Display a 'pretty' label or the path in the UI.
-    if (folderListPref.value == 2) {
-      // Custom path selected and is configured
-      downloadFolder.label = this._getDisplayNameOfFile(currentDirPref.value);
-      iconUrlSpec = fph.getURLSpecFromFile(currentDirPref.value);
-    } else if (folderListPref.value == 1) {
-      // 'Downloads'
-      downloadFolder.label = bundlePreferences.getString("downloadsFolderName");
-      iconUrlSpec = fph.getURLSpecFromFile(await this._indexToFolder(1));
-    } else {
-      // 'Desktop'
-      downloadFolder.label = bundlePreferences.getString("desktopFolderName");
-      iconUrlSpec = fph.getURLSpecFromFile(await this._getDownloadsFolder("Desktop"));
-    }
-    downloadFolder.image = "moz-icon://" + iconUrlSpec + "?size=16";
-  },
-
-  /**
-   * Returns the textual path of a folder in readable form.
-   */
-  _getDisplayNameOfFile(aFolder) {
-    // TODO: would like to add support for 'Downloads on Macintosh HD'
-    //       for OS X users.
-    return aFolder ? aFolder.path : "";
-  },
-
-  /**
-   * Returns the Downloads folder.  If aFolder is "Desktop", then the Downloads
-   * folder returned is the desktop folder; otherwise, it is a folder whose name
-   * indicates that it is a download folder and whose path is as determined by
-   * the XPCOM directory service via the download manager's attribute
-   * defaultDownloadsDirectory.
-   *
-   * @throws if aFolder is not "Desktop" or "Downloads"
-   */
-  async _getDownloadsFolder(aFolder) {
-    switch (aFolder) {
-      case "Desktop":
-        var fileLoc = Components.classes["@mozilla.org/file/directory_service;1"]
-                                    .getService(Components.interfaces.nsIProperties);
-        return fileLoc.get("Desk", Components.interfaces.nsILocalFile);
-      case "Downloads":
-        let downloadsDir = await Downloads.getSystemDownloadsDirectory();
-        return new FileUtils.File(downloadsDir);
-    }
-    throw "ASSERTION FAILED: folder type should be 'Desktop' or 'Downloads'";
-  },
-
-  /**
-   * Determines the type of the given folder.
-   *
-   * @param   aFolder
-   *          the folder whose type is to be determined
-   * @returns integer
-   *          0 if aFolder is the Desktop or is unspecified,
-   *          1 if aFolder is the Downloads folder,
-   *          2 otherwise
-   */
-  async _folderToIndex(aFolder) {
-    if (!aFolder || aFolder.equals(await this._getDownloadsFolder("Desktop")))
-      return 0;
-    else if (aFolder.equals(await this._getDownloadsFolder("Downloads")))
-      return 1;
-    return 2;
-  },
-
-  /**
-   * Converts an integer into the corresponding folder.
-   *
-   * @param   aIndex
-   *          an integer
-   * @returns the Desktop folder if aIndex == 0,
-   *          the Downloads folder if aIndex == 1,
-   *          the folder stored in browser.download.dir
-   */
-  _indexToFolder(aIndex) {
-    switch (aIndex) {
-      case 0:
-        return this._getDownloadsFolder("Desktop");
-      case 1:
-        return this._getDownloadsFolder("Downloads");
-    }
-    var currentDirPref = document.getElementById("browser.download.dir");
-    return currentDirPref.value;
-  }
-
-};
deleted file mode 100644
--- a/browser/components/preferences/in-content-new/applications.xul
+++ /dev/null
@@ -1,131 +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/.
-
-<!-- Applications panel -->
-
-<script type="application/javascript"
-        src="chrome://browser/content/preferences/in-content-new/applications.js"/>
-
-<preferences id="feedsPreferences" hidden="true" data-category="paneApplications">
-  <preference id="browser.feeds.handler"
-              name="browser.feeds.handler"
-              type="string"/>
-  <preference id="browser.feeds.handler.default"
-              name="browser.feeds.handler.default"
-              type="string"/>
-  <preference id="browser.feeds.handlers.application"
-              name="browser.feeds.handlers.application"
-              type="file"/>
-  <preference id="browser.feeds.handlers.webservice"
-              name="browser.feeds.handlers.webservice"
-              type="string"/>
-
-  <preference id="browser.videoFeeds.handler"
-              name="browser.videoFeeds.handler"
-              type="string"/>
-  <preference id="browser.videoFeeds.handler.default"
-              name="browser.videoFeeds.handler.default"
-              type="string"/>
-  <preference id="browser.videoFeeds.handlers.application"
-              name="browser.videoFeeds.handlers.application"
-              type="file"/>
-  <preference id="browser.videoFeeds.handlers.webservice"
-              name="browser.videoFeeds.handlers.webservice"
-              type="string"/>
-
-  <preference id="browser.audioFeeds.handler"
-              name="browser.audioFeeds.handler"
-              type="string"/>
-  <preference id="browser.audioFeeds.handler.default"
-              name="browser.audioFeeds.handler.default"
-              type="string"/>
-  <preference id="browser.audioFeeds.handlers.application"
-              name="browser.audioFeeds.handlers.application"
-              type="file"/>
-  <preference id="browser.audioFeeds.handlers.webservice"
-              name="browser.audioFeeds.handlers.webservice"
-              type="string"/>
-
-  <preference id="pref.downloads.disable_button.edit_actions"
-              name="pref.downloads.disable_button.edit_actions"
-              type="bool"/>
-</preferences>
-
-<keyset data-category="paneApplications">
-  <!-- Ctrl+f/k focus the search box in the Applications pane.
-       These <key>s have oncommand attributes because of bug 371900. -->
-  <key key="&focusSearch1.key;" modifiers="accel" id="focusSearch1" oncommand=";"/>
-  <key key="&focusSearch2.key;" modifiers="accel" id="focusSearch2" oncommand=";"/>
-</keyset>
-
-<hbox id="header-applications"
-      class="header"
-      hidden="true"
-      data-category="paneApplications">
-  <label class="header-name" flex="1">&paneFilesApplications.title;</label>
-</hbox>
-
-<vbox id="applicationsContent"
-      data-category="paneApplications"
-      hidden="true"
-      flex="1">
-
-  <!--Downloads-->
-  <groupbox id="downloadsGroup">
-    <caption><label>&downloads.label;</label></caption>
-
-    <radiogroup id="saveWhere"
-                preference="browser.download.useDownloadDir"
-                onsyncfrompreference="return gApplicationsPane.readUseDownloadDir();">
-      <hbox id="saveToRow">
-        <radio id="saveTo"
-              value="true"
-              label="&saveTo.label;"
-              accesskey="&saveTo.accesskey;"
-              aria-labelledby="saveTo downloadFolder"/>
-        <filefield id="downloadFolder"
-                  flex="1"
-                  preference="browser.download.folderList"
-                  preference-editable="true"
-                  aria-labelledby="saveTo"
-                  onsyncfrompreference="return gApplicationsPane.displayDownloadDirPref();"/>
-        <button id="chooseFolder"
-#ifdef XP_MACOSX
-                accesskey="&chooseFolderMac.accesskey;"
-                label="&chooseFolderMac.label;"
-#else
-                accesskey="&chooseFolderWin.accesskey;"
-                label="&chooseFolderWin.label;"
-#endif
-        />
-      </hbox>
-      <radio id="alwaysAsk"
-            value="false"
-            label="&alwaysAskWhere.label;"
-            accesskey="&alwaysAskWhere.accesskey;"/>
-    </radiogroup>
-  </groupbox>
-
-  <groupbox id="applicationsGroup">
-    <caption><label>&applications.label;</label></caption>
-    <description>&applications.description;</description>
-    <textbox id="filter" flex="1"
-             type="search"
-             placeholder="&filter2.emptytext;"
-             aria-controls="handlersView"/>
-
-    <richlistbox id="handlersView" orient="vertical" persist="lastSelectedType"
-                 preference="pref.downloads.disable_button.edit_actions"
-                 flex="1">
-      <listheader equalsize="always">
-          <treecol id="typeColumn" label="&typeColumn.label;" value="type"
-                   accesskey="&typeColumn.accesskey;" persist="sortDirection"
-                   flex="1" sortDirection="ascending"/>
-          <treecol id="actionColumn" label="&actionColumn2.label;" value="action"
-                   accesskey="&actionColumn2.accesskey;" persist="sortDirection"
-                   flex="1"/>
-      </listheader>
-    </richlistbox>
-  </groupbox>
-</vbox>
--- a/browser/components/preferences/in-content-new/containers.js
+++ b/browser/components/preferences/in-content-new/containers.js
@@ -13,17 +13,17 @@ const defaultContainerIcon = "fingerprin
 const defaultContainerColor = "blue";
 
 let gContainersPane = {
 
   init() {
     this._list = document.getElementById("containersView");
 
     document.getElementById("backContainersLink").addEventListener("click", function() {
-      gotoPref("privacy");
+      gotoPref("general");
     });
 
     this._rebuildView();
   },
 
   _rebuildView() {
     const containers = ContextualIdentityService.getPublicIdentities();
     while (this._list.firstChild) {
--- a/browser/components/preferences/in-content-new/containers.xul
+++ b/browser/components/preferences/in-content-new/containers.xul
@@ -13,17 +13,17 @@
               name="privacy.userContext.enabled"
               type="bool"/>
 
 </preferences>
 
 <hbox hidden="true"
       class="container-header-links"
       data-category="paneContainers">
-  <label class="text-link" id="backContainersLink">&backLink.label;</label>
+  <label class="text-link" id="backContainersLink">&backLink2.label;</label>
 </hbox>
 
 <hbox id="header-containers"
       class="header"
       hidden="true"
       data-category="paneContainers">
   <label class="header-name" flex="1">&paneContainers.title;</label>
 </hbox>
--- a/browser/components/preferences/in-content-new/findInPage.js
+++ b/browser/components/preferences/in-content-new/findInPage.js
@@ -34,16 +34,20 @@ var gSearchResultsPane = {
             this.listSearchTooltips.forEach((anchorNode) => {
               this.calculateTooltipPosition(anchorNode);
             });
             callbackId = null;
           });
         }
       });
     }
+    let strings = this.strings;
+    this.searchInput.placeholder = AppConstants.platform == "win" ?
+      strings.getString("searchInput.labelWin") :
+      strings.getString("searchInput.labelUnix");
   },
 
   handleEvent(event) {
     if (event.type === "command") {
       this.searchFunction(event);
     }
   },
 
--- a/browser/components/preferences/in-content-new/jar.mn
+++ b/browser/components/preferences/in-content-new/jar.mn
@@ -3,14 +3,13 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 browser.jar:
    content/browser/preferences/in-content-new/preferences.js
 *  content/browser/preferences/in-content-new/preferences.xul
    content/browser/preferences/in-content-new/subdialogs.js
 
    content/browser/preferences/in-content-new/main.js
+   content/browser/preferences/in-content-new/search.js
    content/browser/preferences/in-content-new/privacy.js
    content/browser/preferences/in-content-new/containers.js
-   content/browser/preferences/in-content-new/advanced.js
-   content/browser/preferences/in-content-new/applications.js
    content/browser/preferences/in-content-new/sync.js
    content/browser/preferences/in-content-new/findInPage.js
--- a/browser/components/preferences/in-content-new/main.js
+++ b/browser/components/preferences/in-content-new/main.js
@@ -1,49 +1,150 @@
 /* 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/. */
 
 /* import-globals-from preferences.js */
 /* import-globals-from ../../../../toolkit/mozapps/preferences/fontbuilder.js */
+/* import-globals-from ../../../base/content/aboutDialog-appUpdater.js */
 
 Components.utils.import("resource://gre/modules/Services.jsm");
 Components.utils.import("resource://gre/modules/Downloads.jsm");
 Components.utils.import("resource://gre/modules/FileUtils.jsm");
 Components.utils.import("resource:///modules/ShellService.jsm");
 Components.utils.import("resource:///modules/TransientPrefs.jsm");
+Components.utils.import("resource://gre/modules/Services.jsm");
+Components.utils.import("resource://gre/modules/AppConstants.jsm");
+Components.utils.import("resource://gre/modules/DownloadUtils.jsm");
+Components.utils.import("resource://gre/modules/LoadContextInfo.jsm");
+
+// Constants & Enumeration Values
+const TYPE_MAYBE_FEED = "application/vnd.mozilla.maybe.feed";
+const TYPE_MAYBE_VIDEO_FEED = "application/vnd.mozilla.maybe.video.feed";
+const TYPE_MAYBE_AUDIO_FEED = "application/vnd.mozilla.maybe.audio.feed";
+const TYPE_PDF = "application/pdf";
+
+const PREF_PDFJS_DISABLED = "pdfjs.disabled";
+const TOPIC_PDFJS_HANDLER_CHANGED = "pdfjs:handlerChanged";
+
+const PREF_DISABLED_PLUGIN_TYPES = "plugin.disable_full_page_plugin_for_types";
+
+// Preferences that affect which entries to show in the list.
+const PREF_SHOW_PLUGINS_IN_LIST = "browser.download.show_plugins_in_list";
+const PREF_HIDE_PLUGINS_WITHOUT_EXTENSIONS =
+  "browser.download.hide_plugins_without_extensions";
+
+/*
+ * Preferences where we store handling information about the feed type.
+ *
+ * browser.feeds.handler
+ * - "bookmarks", "reader" (clarified further using the .default preference),
+ *   or "ask" -- indicates the default handler being used to process feeds;
+ *   "bookmarks" is obsolete; to specify that the handler is bookmarks,
+ *   set browser.feeds.handler.default to "bookmarks";
+ *
+ * browser.feeds.handler.default
+ * - "bookmarks", "client" or "web" -- indicates the chosen feed reader used
+ *   to display feeds, either transiently (i.e., when the "use as default"
+ *   checkbox is unchecked, corresponds to when browser.feeds.handler=="ask")
+ *   or more permanently (i.e., the item displayed in the dropdown in Feeds
+ *   preferences)
+ *
+ * browser.feeds.handler.webservice
+ * - the URL of the currently selected web service used to read feeds
+ *
+ * browser.feeds.handlers.application
+ * - nsILocalFile, stores the current client-side feed reading app if one has
+ *   been chosen
+ */
+const PREF_FEED_SELECTED_APP    = "browser.feeds.handlers.application";
+const PREF_FEED_SELECTED_WEB    = "browser.feeds.handlers.webservice";
+const PREF_FEED_SELECTED_ACTION = "browser.feeds.handler";
+const PREF_FEED_SELECTED_READER = "browser.feeds.handler.default";
+
+const PREF_VIDEO_FEED_SELECTED_APP    = "browser.videoFeeds.handlers.application";
+const PREF_VIDEO_FEED_SELECTED_WEB    = "browser.videoFeeds.handlers.webservice";
+const PREF_VIDEO_FEED_SELECTED_ACTION = "browser.videoFeeds.handler";
+const PREF_VIDEO_FEED_SELECTED_READER = "browser.videoFeeds.handler.default";
+
+const PREF_AUDIO_FEED_SELECTED_APP    = "browser.audioFeeds.handlers.application";
+const PREF_AUDIO_FEED_SELECTED_WEB    = "browser.audioFeeds.handlers.webservice";
+const PREF_AUDIO_FEED_SELECTED_ACTION = "browser.audioFeeds.handler";
+const PREF_AUDIO_FEED_SELECTED_READER = "browser.audioFeeds.handler.default";
+
+// The nsHandlerInfoAction enumeration values in nsIHandlerInfo identify
+// the actions the application can take with content of various types.
+// But since nsIHandlerInfo doesn't support plugins, there's no value
+// identifying the "use plugin" action, so we use this constant instead.
+const kActionUsePlugin = 5;
+
+const ICON_URL_APP = AppConstants.platform == "linux" ?
+                     "moz-icon://dummy.exe?size=16" :
+                     "chrome://browser/skin/preferences/application.png";
+
+// For CSS. Can be one of "ask", "save", "plugin" or "feed". If absent, the icon URL
+// was set by us to a custom handler icon and CSS should not try to override it.
+const APP_ICON_ATTR_NAME = "appHandlerIcon";
 
 XPCOMUtils.defineLazyModuleGetter(this, "OS",
                                   "resource://gre/modules/osfile.jsm");
 
 if (AppConstants.E10S_TESTING_ONLY) {
   XPCOMUtils.defineLazyModuleGetter(this, "UpdateUtils",
                                     "resource://gre/modules/UpdateUtils.jsm");
 }
 
-XPCOMUtils.defineLazyModuleGetter(this, "PlacesUtils",
-                                  "resource://gre/modules/PlacesUtils.jsm");
-
 if (AppConstants.MOZ_DEV_EDITION) {
   XPCOMUtils.defineLazyModuleGetter(this, "fxAccounts",
                                     "resource://gre/modules/FxAccounts.jsm");
 }
 
-const ENGINE_FLAVOR = "text/x-moz-search-engine";
-
-var gEngineView = null;
-
 var gMainPane = {
-  /**
-   * Initialize autocomplete to ensure prefs are in sync.
-   */
-  _initAutocomplete() {
-    Components.classes["@mozilla.org/autocomplete/search;1?name=unifiedcomplete"]
-              .getService(Components.interfaces.mozIPlacesAutoComplete);
-  },
+  // The set of types the app knows how to handle.  A hash of HandlerInfoWrapper
+  // objects, indexed by type.
+  _handledTypes: {},
+
+  // The list of types we can show, sorted by the sort column/direction.
+  // An array of HandlerInfoWrapper objects.  We build this list when we first
+  // load the data and then rebuild it when users change a pref that affects
+  // what types we can show or change the sort column/direction.
+  // Note: this isn't necessarily the list of types we *will* show; if the user
+  // provides a filter string, we'll only show the subset of types in this list
+  // that match that string.
+  _visibleTypes: [],
+
+  // A count of the number of times each visible type description appears.
+  // We use these counts to determine whether or not to annotate descriptions
+  // with their types to distinguish duplicate descriptions from each other.
+  // A hash of integer counts, indexed by string description.
+  _visibleTypeDescriptionCount: {},
+
+
+  // Convenience & Performance Shortcuts
+
+  // These get defined by init().
+  _brandShortName: null,
+  _prefsBundle: null,
+  _list: null,
+  _filter: null,
+
+  _prefSvc: Cc["@mozilla.org/preferences-service;1"].
+            getService(Ci.nsIPrefBranch),
+
+  _mimeSvc: Cc["@mozilla.org/mime;1"].
+            getService(Ci.nsIMIMEService),
+
+  _helperAppSvc: Cc["@mozilla.org/uriloader/external-helper-app-service;1"].
+                 getService(Ci.nsIExternalHelperAppService),
+
+  _handlerSvc: Cc["@mozilla.org/uriloader/handler-service;1"].
+               getService(Ci.nsIHandlerService),
+
+  _ioSvc: Cc["@mozilla.org/network/io-service;1"].
+          getService(Ci.nsIIOService),
 
   /**
    * Initialization of this.
    */
   init() {
     function setEventListener(aId, aEventType, aCallback) {
       document.getElementById(aId)
               .addEventListener(aEventType, aCallback.bind(gMainPane));
@@ -74,52 +175,23 @@ var gMainPane = {
         };
 
         window.setTimeout(() => {
           window.requestIdleCallback(pollForDefaultBrowser);
         }, 1000);
       }
     }
 
-    gEngineView = new EngineView(new EngineStore());
-    document.getElementById("engineList").view = gEngineView;
-    this.buildDefaultEngineDropDown();
-
+    this.initBrowserContainers();
     this.buildContentProcessCountMenuList();
 
-    let addEnginesLink = document.getElementById("addEngines");
-    let searchEnginesURL = Services.wm.getMostRecentWindow("navigator:browser")
-                                      .BrowserSearch.searchEnginesURL;
-    addEnginesLink.setAttribute("href", searchEnginesURL);
-
     let performanceSettingsLink = document.getElementById("performanceSettingsLearnMore");
     let performanceSettingsUrl = Services.urlFormatter.formatURLPref("app.support.baseURL") + "performance";
     performanceSettingsLink.setAttribute("href", performanceSettingsUrl);
 
-    window.addEventListener("click", this);
-    window.addEventListener("command", this);
-    window.addEventListener("dragstart", this);
-    window.addEventListener("keypress", this);
-    window.addEventListener("select", this);
-    window.addEventListener("blur", this, true);
-
-    Services.obs.addObserver(this, "browser-search-engine-modified");
-    window.addEventListener("unload", () => {
-      Services.obs.removeObserver(this, "browser-search-engine-modified");
-    });
-
-    this._initAutocomplete();
-
-    let suggestsPref =
-      document.getElementById("browser.search.suggest.enabled");
-    suggestsPref.addEventListener("change", () => {
-      this.updateSuggestsCheckbox();
-    });
-    this.updateSuggestsCheckbox();
-
     this.updateDefaultPerformanceSettingsPref();
 
     let defaultPerformancePref =
       document.getElementById("browser.preferences.defaultPerformanceSettings.enabled");
     defaultPerformancePref.addEventListener("change", () => {
       this.updatePerformanceSettingsBox();
     });
     this.updatePerformanceSettingsBox();
@@ -171,16 +243,22 @@ var gMainPane = {
     setEventListener("font.language.group", "change",
       gMainPane._rebuildFonts);
     setEventListener("advancedFonts", "command",
       gMainPane.configureFonts);
     setEventListener("colors", "command",
       gMainPane.configureColors);
     setEventListener("layers.acceleration.disabled", "change",
       gMainPane.updateHardwareAcceleration);
+    setEventListener("connectionSettings", "command",
+      gMainPane.showConnections);
+    setEventListener("browserContainersCheckbox", "command",
+      gMainPane.checkBrowserContainers);
+    setEventListener("browserContainersSettings", "command",
+      gMainPane.showContainerSettings);
 
     // Initializes the fonts dropdowns displayed in this pane.
     this._rebuildFonts();
 
     this.updateOnScreenKeyboardVisibility();
 
     // Show translation preferences if we may:
     const prefName = "browser.translation.ui.show";
@@ -226,22 +304,184 @@ var gMainPane = {
                                                () => separateProfileModeCheckbox.checked = true);
 
       fxAccounts.getSignedInUser().then(data => {
         document.getElementById("getStarted").selectedIndex = data ? 1 : 0;
       })
       .catch(Cu.reportError);
     }
 
+    // Initialize the Firefox Updates section.
+    let version = AppConstants.MOZ_APP_VERSION_DISPLAY;
+
+    // Include the build ID if this is an "a#" (nightly) build
+    if (/a\d+$/.test(version)) {
+      let buildID = Services.appinfo.appBuildID;
+      let year = buildID.slice(0, 4);
+      let month = buildID.slice(4, 6);
+      let day = buildID.slice(6, 8);
+      version += ` (${year}-${month}-${day})`;
+    }
+
+    // Append "(32-bit)" or "(64-bit)" build architecture to the version number:
+    let bundle = Services.strings.createBundle("chrome://browser/locale/browser.properties");
+    let archResource = Services.appinfo.is64Bit
+                       ? "aboutDialog.architecture.sixtyFourBit"
+                       : "aboutDialog.architecture.thirtyTwoBit";
+    let arch = bundle.GetStringFromName(archResource);
+    version += ` (${arch})`;
+
+    document.getElementById("version").textContent = version;
+
+    // Show a release notes link if we have a URL.
+    let relNotesLink = document.getElementById("releasenotes");
+    let relNotesPrefType = Services.prefs.getPrefType("app.releaseNotesURL");
+    if (relNotesPrefType != Services.prefs.PREF_INVALID) {
+      let relNotesURL = Services.urlFormatter.formatURLPref("app.releaseNotesURL");
+      if (relNotesURL != "about:blank") {
+        relNotesLink.href = relNotesURL;
+        relNotesLink.hidden = false;
+      }
+    }
+
+    let distroId = Services.prefs.getCharPref("distribution.id", "");
+    if (distroId) {
+      let distroVersion = Services.prefs.getCharPref("distribution.version");
+
+      let distroIdField = document.getElementById("distributionId");
+      distroIdField.value = distroId + " - " + distroVersion;
+      distroIdField.hidden = false;
+
+      let distroAbout = Services.prefs.getStringPref("distribution.about", "");
+      if (distroAbout) {
+        let distroField = document.getElementById("distribution");
+        distroField.value = distroAbout;
+        distroField.hidden = false;
+      }
+    }
+
+    if (AppConstants.MOZ_UPDATER) {
+      gAppUpdater = new appUpdater();
+      let onUnload = () => {
+        window.removeEventListener("unload", onUnload);
+        Services.prefs.removeObserver("app.update.", this);
+      };
+      window.addEventListener("unload", onUnload);
+      Services.prefs.addObserver("app.update.", this);
+      this.updateReadPrefs();
+      setEventListener("updateRadioGroup", "command",
+                       gMainPane.updateWritePrefs);
+      setEventListener("showUpdateHistory", "command",
+                       gMainPane.showUpdates);
+    }
+
+    // Initilize Application section.
+    // Initialize shortcuts to some commonly accessed elements & values.
+    this._brandShortName =
+      document.getElementById("bundleBrand").getString("brandShortName");
+    this._prefsBundle = document.getElementById("bundlePreferences");
+    this._list = document.getElementById("handlersView");
+    this._filter = document.getElementById("filter");
+
+    // Observe preferences that influence what we display so we can rebuild
+    // the view when they change.
+    this._prefSvc.addObserver(PREF_SHOW_PLUGINS_IN_LIST, this);
+    this._prefSvc.addObserver(PREF_HIDE_PLUGINS_WITHOUT_EXTENSIONS, this);
+    this._prefSvc.addObserver(PREF_FEED_SELECTED_APP, this);
+    this._prefSvc.addObserver(PREF_FEED_SELECTED_WEB, this);
+    this._prefSvc.addObserver(PREF_FEED_SELECTED_ACTION, this);
+    this._prefSvc.addObserver(PREF_FEED_SELECTED_READER, this);
+
+    this._prefSvc.addObserver(PREF_VIDEO_FEED_SELECTED_APP, this);
+    this._prefSvc.addObserver(PREF_VIDEO_FEED_SELECTED_WEB, this);
+    this._prefSvc.addObserver(PREF_VIDEO_FEED_SELECTED_ACTION, this);
+    this._prefSvc.addObserver(PREF_VIDEO_FEED_SELECTED_READER, this);
+
+    this._prefSvc.addObserver(PREF_AUDIO_FEED_SELECTED_APP, this);
+    this._prefSvc.addObserver(PREF_AUDIO_FEED_SELECTED_WEB, this);
+    this._prefSvc.addObserver(PREF_AUDIO_FEED_SELECTED_ACTION, this);
+    this._prefSvc.addObserver(PREF_AUDIO_FEED_SELECTED_READER, this);
+
+    setEventListener("focusSearch1", "command", gMainPane.focusFilterBox);
+    setEventListener("focusSearch2", "command", gMainPane.focusFilterBox);
+    setEventListener("filter", "command", gMainPane.filter);
+    setEventListener("handlersView", "select",
+      gMainPane.onSelectionChanged);
+    setEventListener("typeColumn", "click", gMainPane.sort);
+    setEventListener("actionColumn", "click", gMainPane.sort);
+    setEventListener("chooseFolder", "command", gMainPane.chooseFolder);
+    setEventListener("browser.download.dir", "change", gMainPane.displayDownloadDirPref);
+
+    // Listen for window unload so we can remove our preference observers.
+    window.addEventListener("unload", this);
+
+    // Figure out how we should be sorting the list.  We persist sort settings
+    // across sessions, so we can't assume the default sort column/direction.
+    // XXX should we be using the XUL sort service instead?
+    if (document.getElementById("actionColumn").hasAttribute("sortDirection")) {
+      this._sortColumn = document.getElementById("actionColumn");
+      // The typeColumn element always has a sortDirection attribute,
+      // either because it was persisted or because the default value
+      // from the xul file was used.  If we are sorting on the other
+      // column, we should remove it.
+      document.getElementById("typeColumn").removeAttribute("sortDirection");
+    } else {
+      this._sortColumn = document.getElementById("typeColumn");
+    }
+
+    // Load the data and build the list of handlers.
+    // By doing this in a timeout, we let the preferences dialog resize itself
+    // to an appropriate size before we add a bunch of items to the list.
+    // Otherwise, if there are many items, and the Applications prefpane
+    // is the one that gets displayed when the user first opens the dialog,
+    // the dialog might stretch too much in an attempt to fit them all in.
+    // XXX Shouldn't we perhaps just set a max-height on the richlistbox?
+    var _delayedPaneLoad = function(self) {
+      self._loadData();
+      self._rebuildVisibleTypes();
+      self._sortVisibleTypes();
+      self._rebuildView();
+    }
+    setTimeout(_delayedPaneLoad, 0, this);
+
+    let browserBundle = document.getElementById("browserBundle");
+    appendSearchKeywords("browserContainersSettings", [
+      browserBundle.getString("userContextPersonal.label"),
+      browserBundle.getString("userContextWork.label"),
+      browserBundle.getString("userContextBanking.label"),
+      browserBundle.getString("userContextShopping.label"),
+    ]);
+
     // Notify observers that the UI is now ready
     Components.classes["@mozilla.org/observer-service;1"]
               .getService(Components.interfaces.nsIObserverService)
               .notifyObservers(window, "main-pane-loaded");
   },
 
+  /**
+   * Show the Containers UI depending on the privacy.userContext.ui.enabled pref.
+   */
+  initBrowserContainers() {
+    if (!Services.prefs.getBoolPref("privacy.userContext.ui.enabled")) {
+      // The browserContainersGroup element has its own internal padding that
+      // is visible even if the browserContainersbox is visible, so hide the whole
+      // groupbox if the feature is disabled to prevent a gap in the preferences.
+      document.getElementById("browserContainersbox").setAttribute("data-hidden-from-search", "true");
+      return;
+    }
+
+    let link = document.getElementById("browserContainersLearnMore");
+    link.href = Services.urlFormatter.formatURLPref("app.support.baseURL") + "containers";
+
+    document.getElementById("browserContainersbox").hidden = false;
+
+    document.getElementById("browserContainersCheckbox").checked =
+      Services.prefs.getBoolPref("privacy.userContext.enabled");
+  },
+
   isE10SEnabled() {
     let e10sEnabled;
     try {
       let e10sStatus = Components.classes["@mozilla.org/supports-PRUint64;1"]
                          .createInstance(Ci.nsISupportsPRUint64);
       let appinfo = Services.appinfo.QueryInterface(Ci.nsIObserver);
       appinfo.observe(e10sStatus, "getE10SBlocked", "");
       e10sEnabled = e10sStatus.data < 2;
@@ -667,16 +907,67 @@ var gMainPane = {
   /**
    * Displays the colors dialog, where default web page/link/etc. colors can be
    * configured.
    */
   configureColors() {
     gSubDialog.open("chrome://browser/content/preferences/colors.xul", "resizable=no");
   },
 
+  // NETWORK
+  /**
+   * Displays a dialog in which proxy settings may be changed.
+   */
+  showConnections() {
+    gSubDialog.open("chrome://browser/content/preferences/connection.xul");
+  },
+
+  checkBrowserContainers(event) {
+    let checkbox = document.getElementById("browserContainersCheckbox");
+    if (checkbox.checked) {
+      Services.prefs.setBoolPref("privacy.userContext.enabled", true);
+      return;
+    }
+
+    let count = ContextualIdentityService.countContainerTabs();
+    if (count == 0) {
+      Services.prefs.setBoolPref("privacy.userContext.enabled", false);
+      return;
+    }
+
+    let bundlePreferences = document.getElementById("bundlePreferences");
+
+    let title = bundlePreferences.getString("disableContainersAlertTitle");
+    let message = PluralForm.get(count, bundlePreferences.getString("disableContainersMsg"))
+                            .replace("#S", count)
+    let okButton = PluralForm.get(count, bundlePreferences.getString("disableContainersOkButton"))
+                             .replace("#S", count)
+    let cancelButton = bundlePreferences.getString("disableContainersButton2");
+
+    let buttonFlags = (Ci.nsIPrompt.BUTTON_TITLE_IS_STRING * Ci.nsIPrompt.BUTTON_POS_0) +
+                      (Ci.nsIPrompt.BUTTON_TITLE_IS_STRING * Ci.nsIPrompt.BUTTON_POS_1);
+
+    let rv = Services.prompt.confirmEx(window, title, message, buttonFlags,
+                                       okButton, cancelButton, null, null, {});
+    if (rv == 0) {
+      ContextualIdentityService.closeContainerTabs();
+      Services.prefs.setBoolPref("privacy.userContext.enabled", false);
+      return;
+    }
+
+    checkbox.checked = true;
+  },
+
+  /**
+   * Displays container panel for customising and adding containers.
+   */
+  showContainerSettings() {
+    gotoPref("containers");
+  },
+
   /**
    * ui.osk.enabled
    * - when set to true, subject to other conditions, we may sometimes invoke
    *   an on-screen keyboard when a text input is focused.
    *   (Currently Windows-only, and depending on prefs, may be Windows-8-only)
    */
   updateOnScreenKeyboardVisibility() {
     if (AppConstants.platform == "win") {
@@ -807,36 +1098,16 @@ var gMainPane = {
       if (this._storedSpellCheck == 2) {
         return 2;
       }
       return 1;
     }
     return 0;
   },
 
-  updateSuggestsCheckbox() {
-    let suggestsPref =
-      document.getElementById("browser.search.suggest.enabled");
-    let permanentPB =
-      Services.prefs.getBoolPref("browser.privatebrowsing.autostart");
-    let urlbarSuggests = document.getElementById("urlBarSuggestion");
-    urlbarSuggests.disabled = !suggestsPref.value || permanentPB;
-
-    let urlbarSuggestsPref =
-      document.getElementById("browser.urlbar.suggest.searches");
-    urlbarSuggests.checked = urlbarSuggestsPref.value;
-    if (urlbarSuggests.disabled) {
-      urlbarSuggests.checked = false;
-    }
-
-    let permanentPBLabel =
-      document.getElementById("urlBarSuggestionPermanentPBLabel");
-    permanentPBLabel.hidden = urlbarSuggests.hidden || !permanentPB;
-  },
-
   updateDefaultPerformanceSettingsPref() {
     let defaultPerformancePref =
       document.getElementById("browser.preferences.defaultPerformanceSettings.enabled");
     let processCountPref = document.getElementById("dom.ipc.processCount");
     let accelerationPref = document.getElementById("layers.acceleration.disabled");
     if (processCountPref.value != processCountPref.defaultValue ||
         accelerationPref.value != accelerationPref.defaultValue) {
       defaultPerformancePref.value = false;
@@ -876,536 +1147,2009 @@ var gMainPane = {
     } else {
       document.getElementById("limitContentProcess").disabled = true;
       document.getElementById("contentProcessCount").disabled = true;
       document.getElementById("contentProcessCountEnabledDescription").hidden = true;
       document.getElementById("contentProcessCountDisabledDescription").hidden = false;
     }
   },
 
-  buildDefaultEngineDropDown() {
-    // This is called each time something affects the list of engines.
-    let list = document.getElementById("defaultEngine");
-    // Set selection to the current default engine.
-    let currentEngine = Services.search.currentEngine.name;
-
-    // If the current engine isn't in the list any more, select the first item.
-    let engines = gEngineView._engineStore._engines;
-    if (!engines.some(e => e.name == currentEngine))
-      currentEngine = engines[0].name;
-
-    // Now clean-up and rebuild the list.
-    list.removeAllItems();
-    gEngineView._engineStore._engines.forEach(e => {
-      let item = list.appendItem(e.name);
-      item.setAttribute("class", "menuitem-iconic searchengine-menuitem menuitem-with-favicon");
-      if (e.iconURI) {
-        item.setAttribute("image", e.iconURI.spec);
+  /*
+   * Preferences:
+   *
+   * app.update.enabled
+   * - true if updates to the application are enabled, false otherwise
+   * app.update.auto
+   * - true if updates should be automatically downloaded and installed and
+   * false if the user should be asked what he wants to do when an update is
+   * available
+   * extensions.update.enabled
+   * - true if updates to extensions and themes are enabled, false otherwise
+   * browser.search.update
+   * - true if updates to search engines are enabled, false otherwise
+   */
+
+  /**
+   * Selects the item of the radiogroup based on the pref values and locked
+   * states.
+   *
+   * UI state matrix for update preference conditions
+   *
+   * UI Components:                              Preferences
+   * Radiogroup                                  i   = app.update.enabled
+   *                                             ii  = app.update.auto
+   *
+   * Disabled states:
+   * Element           pref  value  locked  disabled
+   * radiogroup        i     t/f    f       false
+   *                   i     t/f    *t*     *true*
+   *                   ii    t/f    f       false
+   *                   ii    t/f    *t*     *true*
+   */
+  updateReadPrefs() {
+    if (AppConstants.MOZ_UPDATER) {
+      var enabledPref = document.getElementById("app.update.enabled");
+      var autoPref = document.getElementById("app.update.auto");
+      var radiogroup = document.getElementById("updateRadioGroup");
+
+      if (!enabledPref.value)   // Don't care for autoPref.value in this case.
+        radiogroup.value = "manual";    // 3. Never check for updates.
+      else if (autoPref.value)  // enabledPref.value && autoPref.value
+        radiogroup.value = "auto";      // 1. Automatically install updates
+      else                      // enabledPref.value && !autoPref.value
+        radiogroup.value = "checkOnly"; // 2. Check, but let me choose
+
+      var canCheck = Components.classes["@mozilla.org/updates/update-service;1"].
+                       getService(Components.interfaces.nsIApplicationUpdateService).
+                       canCheckForUpdates;
+      // canCheck is false if the enabledPref is false and locked,
+      // or the binary platform or OS version is not known.
+      // A locked pref is sufficient to disable the radiogroup.
+      radiogroup.disabled = !canCheck || enabledPref.locked || autoPref.locked;
+
+      if (AppConstants.MOZ_MAINTENANCE_SERVICE) {
+        // Check to see if the maintenance service is installed.
+        // If it is don't show the preference at all.
+        var installed;
+        try {
+          var wrk = Components.classes["@mozilla.org/windows-registry-key;1"]
+                    .createInstance(Components.interfaces.nsIWindowsRegKey);
+          wrk.open(wrk.ROOT_KEY_LOCAL_MACHINE,
+                   "SOFTWARE\\Mozilla\\MaintenanceService",
+                   wrk.ACCESS_READ | wrk.WOW64_64);
+          installed = wrk.readIntValue("Installed");
+          wrk.close();
+        } catch (e) {
+        }
+        if (installed != 1) {
+          document.getElementById("useService").hidden = true;
+        }
       }
-      item.engine = e;
-      if (e.name == currentEngine)
-        list.selectedItem = item;
-    });
+    }
+  },
+
+  /**
+   * Sets the pref values based on the selected item of the radiogroup.
+   */
+  updateWritePrefs() {
+    if (AppConstants.MOZ_UPDATER) {
+      var enabledPref = document.getElementById("app.update.enabled");
+      var autoPref = document.getElementById("app.update.auto");
+      var radiogroup = document.getElementById("updateRadioGroup");
+      switch (radiogroup.value) {
+        case "auto":      // 1. Automatically install updates for Desktop only
+          enabledPref.value = true;
+          autoPref.value = true;
+          break;
+        case "checkOnly": // 2. Check, but let me choose
+          enabledPref.value = true;
+          autoPref.value = false;
+          break;
+        case "manual":    // 3. Never check for updates.
+          enabledPref.value = false;
+          autoPref.value = false;
+      }
+    }
+  },
+
+  /**
+   * Displays the history of installed updates.
+   */
+  showUpdates() {
+    gSubDialog.open("chrome://mozapps/content/update/history.xul");
   },
 
+  destroy() {
+    window.removeEventListener("unload", this);
+    this._prefSvc.removeObserver(PREF_SHOW_PLUGINS_IN_LIST, this);
+    this._prefSvc.removeObserver(PREF_HIDE_PLUGINS_WITHOUT_EXTENSIONS, this);
+    this._prefSvc.removeObserver(PREF_FEED_SELECTED_APP, this);
+    this._prefSvc.removeObserver(PREF_FEED_SELECTED_WEB, this);
+    this._prefSvc.removeObserver(PREF_FEED_SELECTED_ACTION, this);
+    this._prefSvc.removeObserver(PREF_FEED_SELECTED_READER, this);
+
+    this._prefSvc.removeObserver(PREF_VIDEO_FEED_SELECTED_APP, this);
+    this._prefSvc.removeObserver(PREF_VIDEO_FEED_SELECTED_WEB, this);
+    this._prefSvc.removeObserver(PREF_VIDEO_FEED_SELECTED_ACTION, this);
+    this._prefSvc.removeObserver(PREF_VIDEO_FEED_SELECTED_READER, this);
+
+    this._prefSvc.removeObserver(PREF_AUDIO_FEED_SELECTED_APP, this);
+    this._prefSvc.removeObserver(PREF_AUDIO_FEED_SELECTED_WEB, this);
+    this._prefSvc.removeObserver(PREF_AUDIO_FEED_SELECTED_ACTION, this);
+    this._prefSvc.removeObserver(PREF_AUDIO_FEED_SELECTED_READER, this);
+  },
+
+
+  // nsISupports
+
+  QueryInterface(aIID) {
+    if (aIID.equals(Ci.nsIObserver) ||
+        aIID.equals(Ci.nsIDOMEventListener ||
+        aIID.equals(Ci.nsISupports)))
+      return this;
+
+    throw Cr.NS_ERROR_NO_INTERFACE;
+  },
+
+
+  // nsIObserver
+
+  observe(aSubject, aTopic, aData) {
+    if (aTopic == "nsPref:changed") {
+      // Rebuild the list when there are changes to preferences that influence
+      // whether or not to show certain entries in the list.
+      if (!this._storingAction) {
+        // These two prefs alter the list of visible types, so we have to rebuild
+        // that list when they change.
+        if (aData == PREF_SHOW_PLUGINS_IN_LIST ||
+            aData == PREF_HIDE_PLUGINS_WITHOUT_EXTENSIONS) {
+          this._rebuildVisibleTypes();
+          this._sortVisibleTypes();
+        }
+
+        // All the prefs we observe can affect what we display, so we rebuild
+        // the view when any of them changes.
+        this._rebuildView();
+      }
+      if (AppConstants.MOZ_UPDATER) {
+        this.updateReadPrefs();
+      }
+    }
+  },
+
+
+  // nsIDOMEventListener
+
   handleEvent(aEvent) {
-    switch (aEvent.type) {
-      case "click":
-        if (aEvent.target.id != "engineChildren" &&
-            !aEvent.target.classList.contains("searchEngineAction")) {
-          let engineList = document.getElementById("engineList");
-          // We don't want to toggle off selection while editing keyword
-          // so proceed only when the input field is hidden.
-          // We need to check that engineList.view is defined here
-          // because the "click" event listener is on <window> and the
-          // view might have been destroyed if the pane has been navigated
-          // away from.
-          if (engineList.inputField.hidden && engineList.view) {
-            let selection = engineList.view.selection;
-            if (selection.count > 0) {
-              selection.toggleSelect(selection.currentIndex);
-            }
-            engineList.blur();
-          }
+    if (aEvent.type == "unload") {
+      this.destroy();
+    }
+  },
+
+
+  // Composed Model Construction
+
+  _loadData() {
+    this._loadFeedHandler();
+    this._loadInternalHandlers();
+    this._loadPluginHandlers();
+    this._loadApplicationHandlers();
+  },
+
+  _loadFeedHandler() {
+    this._handledTypes[TYPE_MAYBE_FEED] = feedHandlerInfo;
+    feedHandlerInfo.handledOnlyByPlugin = false;
+
+    this._handledTypes[TYPE_MAYBE_VIDEO_FEED] = videoFeedHandlerInfo;
+    videoFeedHandlerInfo.handledOnlyByPlugin = false;
+
+    this._handledTypes[TYPE_MAYBE_AUDIO_FEED] = audioFeedHandlerInfo;
+    audioFeedHandlerInfo.handledOnlyByPlugin = false;
+  },
+
+  /**
+   * Load higher level internal handlers so they can be turned on/off in the
+   * applications menu.
+   */
+  _loadInternalHandlers() {
+    var internalHandlers = [pdfHandlerInfo];
+    for (let internalHandler of internalHandlers) {
+      if (internalHandler.enabled) {
+        this._handledTypes[internalHandler.type] = internalHandler;
+      }
+    }
+  },
+
+  /**
+   * Load the set of handlers defined by plugins.
+   *
+   * Note: if there's more than one plugin for a given MIME type, we assume
+   * the last one is the one that the application will use.  That may not be
+   * correct, but it's how we've been doing it for years.
+   *
+   * Perhaps we should instead query navigator.mimeTypes for the set of types
+   * supported by the application and then get the plugin from each MIME type's
+   * enabledPlugin property.  But if there's a plugin for a type, we need
+   * to know about it even if it isn't enabled, since we're going to give
+   * the user an option to enable it.
+   *
+   * Also note that enabledPlugin does not get updated when
+   * plugin.disable_full_page_plugin_for_types changes, so even if we could use
+   * enabledPlugin to get the plugin that would be used, we'd still need to
+   * check the pref ourselves to find out if it's enabled.
+   */
+  _loadPluginHandlers() {
+    "use strict";
+
+    let mimeTypes = navigator.mimeTypes;
+
+    for (let mimeType of mimeTypes) {
+      let handlerInfoWrapper;
+      if (mimeType.type in this._handledTypes) {
+        handlerInfoWrapper = this._handledTypes[mimeType.type];
+      } else {
+        let wrappedHandlerInfo =
+              this._mimeSvc.getFromTypeAndExtension(mimeType.type, null);
+        handlerInfoWrapper = new HandlerInfoWrapper(mimeType.type, wrappedHandlerInfo);
+        handlerInfoWrapper.handledOnlyByPlugin = true;
+        this._handledTypes[mimeType.type] = handlerInfoWrapper;
+      }
+      handlerInfoWrapper.pluginName = mimeType.enabledPlugin.name;
+    }
+  },
+
+  /**
+   * Load the set of handlers defined by the application datastore.
+   */
+  _loadApplicationHandlers() {
+    var wrappedHandlerInfos = this._handlerSvc.enumerate();
+    while (wrappedHandlerInfos.hasMoreElements()) {
+      let wrappedHandlerInfo =
+        wrappedHandlerInfos.getNext().QueryInterface(Ci.nsIHandlerInfo);
+      let type = wrappedHandlerInfo.type;
+
+      let handlerInfoWrapper;
+      if (type in this._handledTypes)
+        handlerInfoWrapper = this._handledTypes[type];
+      else {
+        handlerInfoWrapper = new HandlerInfoWrapper(type, wrappedHandlerInfo);
+        this._handledTypes[type] = handlerInfoWrapper;
+      }
+
+      handlerInfoWrapper.handledOnlyByPlugin = false;
+    }
+  },
+
+
+  // View Construction
+
+  _rebuildVisibleTypes() {
+    // Reset the list of visible types and the visible type description counts.
+    this._visibleTypes = [];
+    this._visibleTypeDescriptionCount = {};
+
+    // Get the preferences that help determine what types to show.
+    var showPlugins = this._prefSvc.getBoolPref(PREF_SHOW_PLUGINS_IN_LIST);
+    var hidePluginsWithoutExtensions =
+      this._prefSvc.getBoolPref(PREF_HIDE_PLUGINS_WITHOUT_EXTENSIONS);
+
+    for (let type in this._handledTypes) {
+      let handlerInfo = this._handledTypes[type];
+
+      // Hide plugins without associated extensions if so prefed so we don't
+      // show a whole bunch of obscure types handled by plugins on Mac.
+      // Note: though protocol types don't have extensions, we still show them;
+      // the pref is only meant to be applied to MIME types, since plugins are
+      // only associated with MIME types.
+      // FIXME: should we also check the "suffixes" property of the plugin?
+      // Filed as bug 395135.
+      if (hidePluginsWithoutExtensions && handlerInfo.handledOnlyByPlugin &&
+          handlerInfo.wrappedHandlerInfo instanceof Ci.nsIMIMEInfo &&
+          !handlerInfo.primaryExtension)
+        continue;
+
+      // Hide types handled only by plugins if so prefed.
+      if (handlerInfo.handledOnlyByPlugin && !showPlugins)
+        continue;
+
+      // We couldn't find any reason to exclude the type, so include it.
+      this._visibleTypes.push(handlerInfo);
+
+      if (handlerInfo.description in this._visibleTypeDescriptionCount)
+        this._visibleTypeDescriptionCount[handlerInfo.description]++;
+      else
+        this._visibleTypeDescriptionCount[handlerInfo.description] = 1;
+    }
+  },
+
+  _rebuildView() {
+    // Clear the list of entries.
+    while (this._list.childNodes.length > 1)
+      this._list.removeChild(this._list.lastChild);
+
+    var visibleTypes = this._visibleTypes;
+
+    // If the user is filtering the list, then only show matching types.
+    if (this._filter.value)
+      visibleTypes = visibleTypes.filter(this._matchesFilter, this);
+
+    for (let visibleType of visibleTypes) {
+      let item = document.createElement("richlistitem");
+      item.setAttribute("type", visibleType.type);
+      item.setAttribute("typeDescription", this._describeType(visibleType));
+      if (visibleType.smallIcon)
+        item.setAttribute("typeIcon", visibleType.smallIcon);
+      item.setAttribute("actionDescription",
+                        this._describePreferredAction(visibleType));
+
+      if (!this._setIconClassForPreferredAction(visibleType, item)) {
+        item.setAttribute("actionIcon",
+                          this._getIconURLForPreferredAction(visibleType));
+      }
+
+      this._list.appendChild(item);
+    }
+
+    this._selectLastSelectedType();
+  },
+
+  _matchesFilter(aType) {
+    var filterValue = this._filter.value.toLowerCase();
+    return this._describeType(aType).toLowerCase().indexOf(filterValue) != -1 ||
+           this._describePreferredAction(aType).toLowerCase().indexOf(filterValue) != -1;
+  },
+
+  /**
+   * Describe, in a human-readable fashion, the type represented by the given
+   * handler info object.  Normally this is just the description provided by
+   * the info object, but if more than one object presents the same description,
+   * then we annotate the duplicate descriptions with the type itself to help
+   * users distinguish between those types.
+   *
+   * @param aHandlerInfo {nsIHandlerInfo} the type being described
+   * @returns {string} a description of the type
+   */
+  _describeType(aHandlerInfo) {
+    if (this._visibleTypeDescriptionCount[aHandlerInfo.description] > 1)
+      return this._prefsBundle.getFormattedString("typeDescriptionWithType",
+                                                  [aHandlerInfo.description,
+                                                   aHandlerInfo.type]);
+
+    return aHandlerInfo.description;
+  },
+
+  /**
+   * Describe, in a human-readable fashion, the preferred action to take on
+   * the type represented by the given handler info object.
+   *
+   * XXX Should this be part of the HandlerInfoWrapper interface?  It would
+   * violate the separation of model and view, but it might make more sense
+   * nonetheless (f.e. it would make sortTypes easier).
+   *
+   * @param aHandlerInfo {nsIHandlerInfo} the type whose preferred action
+   *                                      is being described
+   * @returns {string} a description of the action
+   */
+  _describePreferredAction(aHandlerInfo) {
+    // alwaysAskBeforeHandling overrides the preferred action, so if that flag
+    // is set, then describe that behavior instead.  For most types, this is
+    // the "alwaysAsk" string, but for the feed type we show something special.
+    if (aHandlerInfo.alwaysAskBeforeHandling) {
+      if (isFeedType(aHandlerInfo.type))
+        return this._prefsBundle.getFormattedString("previewInApp",
+                                                    [this._brandShortName]);
+      return this._prefsBundle.getString("alwaysAsk");
+    }
+
+    switch (aHandlerInfo.preferredAction) {
+      case Ci.nsIHandlerInfo.saveToDisk:
+        return this._prefsBundle.getString("saveFile");
+
+      case Ci.nsIHandlerInfo.useHelperApp:
+        var preferredApp = aHandlerInfo.preferredApplicationHandler;
+        var name;
+        if (preferredApp instanceof Ci.nsILocalHandlerApp)
+          name = getFileDisplayName(preferredApp.executable);
+        else
+          name = preferredApp.name;
+        return this._prefsBundle.getFormattedString("useApp", [name]);
+
+      case Ci.nsIHandlerInfo.handleInternally:
+        // For the feed type, handleInternally means live bookmarks.
+        if (isFeedType(aHandlerInfo.type)) {
+          return this._prefsBundle.getFormattedString("addLiveBookmarksInApp",
+                                                      [this._brandShortName]);
+        }
+
+        if (aHandlerInfo instanceof InternalHandlerInfoWrapper) {
+          return this._prefsBundle.getFormattedString("previewInApp",
+                                                      [this._brandShortName]);
+        }
+
+        // For other types, handleInternally looks like either useHelperApp
+        // or useSystemDefault depending on whether or not there's a preferred
+        // handler app.
+        if (this.isValidHandlerApp(aHandlerInfo.preferredApplicationHandler))
+          return aHandlerInfo.preferredApplicationHandler.name;
+
+        return aHandlerInfo.defaultDescription;
+
+        // XXX Why don't we say the app will handle the type internally?
+        // Is it because the app can't actually do that?  But if that's true,
+        // then why would a preferredAction ever get set to this value
+        // in the first place?
+
+      case Ci.nsIHandlerInfo.useSystemDefault:
+        return this._prefsBundle.getFormattedString("useDefault",
+                                                    [aHandlerInfo.defaultDescription]);
+
+      case kActionUsePlugin:
+        return this._prefsBundle.getFormattedString("usePluginIn",
+                                                    [aHandlerInfo.pluginName,
+                                                     this._brandShortName]);
+      default:
+        throw new Error(`Unexpected preferredAction: ${aHandlerInfo.preferredAction}`);
+    }
+  },
+
+  _selectLastSelectedType() {
+    // If the list is disabled by the pref.downloads.disable_button.edit_actions
+    // preference being locked, then don't select the type, as that would cause
+    // it to appear selected, with a different background and an actions menu
+    // that makes it seem like you can choose an action for the type.
+    if (this._list.disabled)
+      return;
+
+    var lastSelectedType = this._list.getAttribute("lastSelectedType");
+    if (!lastSelectedType)
+      return;
+
+    var item = this._list.getElementsByAttribute("type", lastSelectedType)[0];
+    if (!item)
+      return;
+
+    this._list.selectedItem = item;
+  },
+
+  /**
+   * Whether or not the given handler app is valid.
+   *
+   * @param aHandlerApp {nsIHandlerApp} the handler app in question
+   *
+   * @returns {boolean} whether or not it's valid
+   */
+  isValidHandlerApp(aHandlerApp) {
+    if (!aHandlerApp)
+      return false;
+
+    if (aHandlerApp instanceof Ci.nsILocalHandlerApp)
+      return this._isValidHandlerExecutable(aHandlerApp.executable);
+
+    if (aHandlerApp instanceof Ci.nsIWebHandlerApp)
+      return aHandlerApp.uriTemplate;
+
+    if (aHandlerApp instanceof Ci.nsIWebContentHandlerInfo)
+      return aHandlerApp.uri;
+
+    return false;
+  },
+
+  _isValidHandlerExecutable(aExecutable) {
+    let leafName;
+    if (AppConstants.platform == "win") {
+      leafName = `${AppConstants.MOZ_APP_NAME}.exe`;
+    } else if (AppConstants.platform == "macosx") {
+      leafName = AppConstants.MOZ_MACBUNDLE_NAME;
+    } else {
+      leafName = `${AppConstants.MOZ_APP_NAME}-bin`;
+    }
+    return aExecutable &&
+           aExecutable.exists() &&
+           aExecutable.isExecutable() &&
+// XXXben - we need to compare this with the running instance executable
+//          just don't know how to do that via script...
+// XXXmano TBD: can probably add this to nsIShellService
+           aExecutable.leafName != leafName;
+  },
+
+  /**
+   * Rebuild the actions menu for the selected entry.  Gets called by
+   * the richlistitem constructor when an entry in the list gets selected.
+   */
+  rebuildActionsMenu() {
+    var typeItem = this._list.selectedItem;
+    var handlerInfo = this._handledTypes[typeItem.type];
+    var menu =
+      document.getAnonymousElementByAttribute(typeItem, "class", "actionsMenu");
+    var menuPopup = menu.menupopup;
+
+    // Clear out existing items.
+    while (menuPopup.hasChildNodes())
+      menuPopup.removeChild(menuPopup.lastChild);
+
+    let internalMenuItem;
+    // Add the "Preview in Firefox" option for optional internal handlers.
+    if (handlerInfo instanceof InternalHandlerInfoWrapper) {
+      internalMenuItem = document.createElement("menuitem");
+      internalMenuItem.setAttribute("action", Ci.nsIHandlerInfo.handleInternally);
+      let label = this._prefsBundle.getFormattedString("previewInApp",
+                                                       [this._brandShortName]);
+      internalMenuItem.setAttribute("label", label);
+      internalMenuItem.setAttribute("tooltiptext", label);
+      internalMenuItem.setAttribute(APP_ICON_ATTR_NAME, "ask");
+      menuPopup.appendChild(internalMenuItem);
+    }
+
+    {
+      var askMenuItem = document.createElement("menuitem");
+      askMenuItem.setAttribute("action", Ci.nsIHandlerInfo.alwaysAsk);
+      let label;
+      if (isFeedType(handlerInfo.type))
+        label = this._prefsBundle.getFormattedString("previewInApp",
+                                                     [this._brandShortName]);
+      else
+        label = this._prefsBundle.getString("alwaysAsk");
+      askMenuItem.setAttribute("label", label);
+      askMenuItem.setAttribute("tooltiptext", label);
+      askMenuItem.setAttribute(APP_ICON_ATTR_NAME, "ask");
+      menuPopup.appendChild(askMenuItem);
+    }
+
+    // Create a menu item for saving to disk.
+    // Note: this option isn't available to protocol types, since we don't know
+    // what it means to save a URL having a certain scheme to disk, nor is it
+    // available to feeds, since the feed code doesn't implement the capability.
+    if ((handlerInfo.wrappedHandlerInfo instanceof Ci.nsIMIMEInfo) &&
+        !isFeedType(handlerInfo.type)) {
+      var saveMenuItem = document.createElement("menuitem");
+      saveMenuItem.setAttribute("action", Ci.nsIHandlerInfo.saveToDisk);
+      let label = this._prefsBundle.getString("saveFile");
+      saveMenuItem.setAttribute("label", label);
+      saveMenuItem.setAttribute("tooltiptext", label);
+      saveMenuItem.setAttribute(APP_ICON_ATTR_NAME, "save");
+      menuPopup.appendChild(saveMenuItem);
+    }
+
+    // If this is the feed type, add a Live Bookmarks item.
+    if (isFeedType(handlerInfo.type)) {
+      internalMenuItem = document.createElement("menuitem");
+      internalMenuItem.setAttribute("action", Ci.nsIHandlerInfo.handleInternally);
+      let label = this._prefsBundle.getFormattedString("addLiveBookmarksInApp",
+                                                       [this._brandShortName]);
+      internalMenuItem.setAttribute("label", label);
+      internalMenuItem.setAttribute("tooltiptext", label);
+      internalMenuItem.setAttribute(APP_ICON_ATTR_NAME, "feed");
+      menuPopup.appendChild(internalMenuItem);
+    }
+
+    // Add a separator to distinguish these items from the helper app items
+    // that follow them.
+    let menuseparator = document.createElement("menuseparator");
+    menuPopup.appendChild(menuseparator);
+
+    // Create a menu item for the OS default application, if any.
+    if (handlerInfo.hasDefaultHandler) {
+      var defaultMenuItem = document.createElement("menuitem");
+      defaultMenuItem.setAttribute("action", Ci.nsIHandlerInfo.useSystemDefault);
+      let label = this._prefsBundle.getFormattedString("useDefault",
+                                                       [handlerInfo.defaultDescription]);
+      defaultMenuItem.setAttribute("label", label);
+      defaultMenuItem.setAttribute("tooltiptext", handlerInfo.defaultDescription);
+      defaultMenuItem.setAttribute("image", this._getIconURLForSystemDefault(handlerInfo));
+
+      menuPopup.appendChild(defaultMenuItem);
+    }
+
+    // Create menu items for possible handlers.
+    let preferredApp = handlerInfo.preferredApplicationHandler;
+    let possibleApps = handlerInfo.possibleApplicationHandlers.enumerate();
+    var possibleAppMenuItems = [];
+    while (possibleApps.hasMoreElements()) {
+      let possibleApp = possibleApps.getNext();
+      if (!this.isValidHandlerApp(possibleApp))
+        continue;
+
+      let menuItem = document.createElement("menuitem");
+      menuItem.setAttribute("action", Ci.nsIHandlerInfo.useHelperApp);
+      let label;
+      if (possibleApp instanceof Ci.nsILocalHandlerApp)
+        label = getFileDisplayName(possibleApp.executable);
+      else
+        label = possibleApp.name;
+      label = this._prefsBundle.getFormattedString("useApp", [label]);
+      menuItem.setAttribute("label", label);
+      menuItem.setAttribute("tooltiptext", label);
+      menuItem.setAttribute("image", this._getIconURLForHandlerApp(possibleApp));
+
+      // Attach the handler app object to the menu item so we can use it
+      // to make changes to the datastore when the user selects the item.
+      menuItem.handlerApp = possibleApp;
+
+      menuPopup.appendChild(menuItem);
+      possibleAppMenuItems.push(menuItem);
+    }
+
+    // Create a menu item for the plugin.
+    if (handlerInfo.pluginName) {
+      var pluginMenuItem = document.createElement("menuitem");
+      pluginMenuItem.setAttribute("action", kActionUsePlugin);
+      let label = this._prefsBundle.getFormattedString("usePluginIn",
+                                                       [handlerInfo.pluginName,
+                                                        this._brandShortName]);
+      pluginMenuItem.setAttribute("label", label);
+      pluginMenuItem.setAttribute("tooltiptext", label);
+      pluginMenuItem.setAttribute(APP_ICON_ATTR_NAME, "plugin");
+      menuPopup.appendChild(pluginMenuItem);
+    }
+
+    // Create a menu item for selecting a local application.
+    let canOpenWithOtherApp = true;
+    if (AppConstants.platform == "win") {
+      // On Windows, selecting an application to open another application
+      // would be meaningless so we special case executables.
+      let executableType = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService)
+                                                    .getTypeFromExtension("exe");
+      canOpenWithOtherApp = handlerInfo.type != executableType;
+    }
+    if (canOpenWithOtherApp) {
+      let menuItem = document.createElement("menuitem");
+      menuItem.className = "choose-app-item";
+      menuItem.addEventListener("command", function(e) {
+        gMainPane.chooseApp(e);
+      });
+      let label = this._prefsBundle.getString("useOtherApp");
+      menuItem.setAttribute("label", label);
+      menuItem.setAttribute("tooltiptext", label);
+      menuPopup.appendChild(menuItem);
+    }
+
+    // Create a menu item for managing applications.
+    if (possibleAppMenuItems.length) {
+      let menuItem = document.createElement("menuseparator");
+      menuPopup.appendChild(menuItem);
+      menuItem = document.createElement("menuitem");
+      menuItem.className = "manage-app-item";
+      menuItem.addEventListener("command", function(e) {
+        gMainPane.manageApp(e);
+      });
+      menuItem.setAttribute("label", this._prefsBundle.getString("manageApp"));
+      menuPopup.appendChild(menuItem);
+    }
+
+    // Select the item corresponding to the preferred action.  If the always
+    // ask flag is set, it overrides the preferred action.  Otherwise we pick
+    // the item identified by the preferred action (when the preferred action
+    // is to use a helper app, we have to pick the specific helper app item).
+    if (handlerInfo.alwaysAskBeforeHandling)
+      menu.selectedItem = askMenuItem;
+    else switch (handlerInfo.preferredAction) {
+      case Ci.nsIHandlerInfo.handleInternally:
+        if (internalMenuItem) {
+          menu.selectedItem = internalMenuItem;
+        } else {
+          Cu.reportError("No menu item defined to set!")
         }
         break;
-      case "command":
-        switch (aEvent.target.id) {
-          case "":
-            if (aEvent.target.parentNode &&
-                aEvent.target.parentNode.parentNode &&
-                aEvent.target.parentNode.parentNode.id == "defaultEngine") {
-              gMainPane.setDefaultEngine();
-            }
-            break;
-          case "restoreDefaultSearchEngines":
-            gMainPane.onRestoreDefaults();
-            break;
-          case "removeEngineButton":
-            Services.search.removeEngine(gEngineView.selectedEngine.originalEngine);
-            break;
-        }
+      case Ci.nsIHandlerInfo.useSystemDefault:
+        menu.selectedItem = defaultMenuItem;
         break;
-      case "dragstart":
-        if (aEvent.target.id == "engineChildren") {
-          onDragEngineStart(aEvent);
-        }
-        break;
-      case "keypress":
-        if (aEvent.target.id == "engineList") {
-          gMainPane.onTreeKeyPress(aEvent);
-        }
+      case Ci.nsIHandlerInfo.useHelperApp:
+        if (preferredApp)
+          menu.selectedItem =
+            possibleAppMenuItems.filter(v => v.handlerApp.equals(preferredApp))[0];
         break;
-      case "select":
-        if (aEvent.target.id == "engineList") {
-          gMainPane.onTreeSelect();
-        }
+      case kActionUsePlugin:
+        menu.selectedItem = pluginMenuItem;
         break;
-      case "blur":
-        if (aEvent.target.id == "engineList" &&
-            aEvent.target.inputField == document.getBindingParent(aEvent.originalTarget)) {
-          gMainPane.onInputBlur();
-        }
+      case Ci.nsIHandlerInfo.saveToDisk:
+        menu.selectedItem = saveMenuItem;
         break;
     }
   },
 
-  observe(aEngine, aTopic, aVerb) {
-    if (aTopic == "browser-search-engine-modified") {
-      aEngine.QueryInterface(Components.interfaces.nsISearchEngine);
-      switch (aVerb) {
-      case "engine-added":
-        gEngineView._engineStore.addEngine(aEngine);
-        gEngineView.rowCountChanged(gEngineView.lastIndex, 1);
-        gMainPane.buildDefaultEngineDropDown();
+
+  // Sorting & Filtering
+
+  _sortColumn: null,
+
+  /**
+   * Sort the list when the user clicks on a column header.
+   */
+  sort(event) {
+    var column = event.target;
+
+    // If the user clicked on a new sort column, remove the direction indicator
+    // from the old column.
+    if (this._sortColumn && this._sortColumn != column)
+      this._sortColumn.removeAttribute("sortDirection");
+
+    this._sortColumn = column;
+
+    // Set (or switch) the sort direction indicator.
+    if (column.getAttribute("sortDirection") == "ascending")
+      column.setAttribute("sortDirection", "descending");
+    else
+      column.setAttribute("sortDirection", "ascending");
+
+    this._sortVisibleTypes();
+    this._rebuildView();
+  },
+
+  /**
+   * Sort the list of visible types by the current sort column/direction.
+   */
+  _sortVisibleTypes() {
+    if (!this._sortColumn)
+      return;
+
+    var t = this;
+
+    function sortByType(a, b) {
+      return t._describeType(a).toLowerCase().
+             localeCompare(t._describeType(b).toLowerCase());
+    }
+
+    function sortByAction(a, b) {
+      return t._describePreferredAction(a).toLowerCase().
+             localeCompare(t._describePreferredAction(b).toLowerCase());
+    }
+
+    switch (this._sortColumn.getAttribute("value")) {
+      case "type":
+        this._visibleTypes.sort(sortByType);
+        break;
+      case "action":
+        this._visibleTypes.sort(sortByAction);
         break;
-      case "engine-changed":
-        gEngineView._engineStore.reloadIcons();
-        gEngineView.invalidate();
+    }
+
+    if (this._sortColumn.getAttribute("sortDirection") == "descending")
+      this._visibleTypes.reverse();
+  },
+
+  /**
+   * Filter the list when the user enters a filter term into the filter field.
+   */
+  filter() {
+    this._rebuildView();
+  },
+
+  focusFilterBox() {
+    this._filter.focus();
+    this._filter.select();
+  },
+
+
+  // Changes
+
+  onSelectAction(aActionItem) {
+    this._storingAction = true;
+
+    try {
+      this._storeAction(aActionItem);
+    } finally {
+      this._storingAction = false;
+    }
+  },
+
+  _storeAction(aActionItem) {
+    var typeItem = this._list.selectedItem;
+    var handlerInfo = this._handledTypes[typeItem.type];
+
+    let action = parseInt(aActionItem.getAttribute("action"));
+
+    // Set the plugin state if we're enabling or disabling a plugin.
+    if (action == kActionUsePlugin)
+      handlerInfo.enablePluginType();
+    else if (handlerInfo.pluginName && !handlerInfo.isDisabledPluginType)
+      handlerInfo.disablePluginType();
+
+    // Set the preferred application handler.
+    // We leave the existing preferred app in the list when we set
+    // the preferred action to something other than useHelperApp so that
+    // legacy datastores that don't have the preferred app in the list
+    // of possible apps still include the preferred app in the list of apps
+    // the user can choose to handle the type.
+    if (action == Ci.nsIHandlerInfo.useHelperApp)
+      handlerInfo.preferredApplicationHandler = aActionItem.handlerApp;
+
+    // Set the "always ask" flag.
+    if (action == Ci.nsIHandlerInfo.alwaysAsk)
+      handlerInfo.alwaysAskBeforeHandling = true;
+    else
+      handlerInfo.alwaysAskBeforeHandling = false;
+
+    // Set the preferred action.
+    handlerInfo.preferredAction = action;
+
+    handlerInfo.store();
+
+    // Make sure the handler info object is flagged to indicate that there is
+    // now some user configuration for the type.
+    handlerInfo.handledOnlyByPlugin = false;
+
+    // Update the action label and image to reflect the new preferred action.
+    typeItem.setAttribute("actionDescription",
+                          this._describePreferredAction(handlerInfo));
+    if (!this._setIconClassForPreferredAction(handlerInfo, typeItem)) {
+      typeItem.setAttribute("actionIcon",
+                            this._getIconURLForPreferredAction(handlerInfo));
+    }
+  },
+
+  manageApp(aEvent) {
+    // Don't let the normal "on select action" handler get this event,
+    // as we handle it specially ourselves.
+    aEvent.stopPropagation();
+
+    var typeItem = this._list.selectedItem;
+    var handlerInfo = this._handledTypes[typeItem.type];
+
+    let onComplete = () => {
+      // Rebuild the actions menu so that we revert to the previous selection,
+      // or "Always ask" if the previous default application has been removed
+      this.rebuildActionsMenu();
+
+      // update the richlistitem too. Will be visible when selecting another row
+      typeItem.setAttribute("actionDescription",
+                            this._describePreferredAction(handlerInfo));
+      if (!this._setIconClassForPreferredAction(handlerInfo, typeItem)) {
+        typeItem.setAttribute("actionIcon",
+                              this._getIconURLForPreferredAction(handlerInfo));
+      }
+    };
+
+    gSubDialog.open("chrome://browser/content/preferences/applicationManager.xul",
+                    "resizable=no", handlerInfo, onComplete);
+
+  },
+
+  chooseApp(aEvent) {
+    // Don't let the normal "on select action" handler get this event,
+    // as we handle it specially ourselves.
+    aEvent.stopPropagation();
+
+    var handlerApp;
+    let chooseAppCallback = aHandlerApp => {
+      // Rebuild the actions menu whether the user picked an app or canceled.
+      // If they picked an app, we want to add the app to the menu and select it.
+      // If they canceled, we want to go back to their previous selection.
+      this.rebuildActionsMenu();
+
+      // If the user picked a new app from the menu, select it.
+      if (aHandlerApp) {
+        let typeItem = this._list.selectedItem;
+        let actionsMenu =
+          document.getAnonymousElementByAttribute(typeItem, "class", "actionsMenu");
+        let menuItems = actionsMenu.menupopup.childNodes;
+        for (let i = 0; i < menuItems.length; i++) {
+          let menuItem = menuItems[i];
+          if (menuItem.handlerApp && menuItem.handlerApp.equals(aHandlerApp)) {
+            actionsMenu.selectedIndex = i;
+            this.onSelectAction(menuItem);
+            break;
+          }
+        }
+      }
+    };
+
+    if (AppConstants.platform == "win") {
+      var params = {};
+      var handlerInfo = this._handledTypes[this._list.selectedItem.type];
+
+      if (isFeedType(handlerInfo.type)) {
+        // MIME info will be null, create a temp object.
+        params.mimeInfo = this._mimeSvc.getFromTypeAndExtension(handlerInfo.type,
+                                                   handlerInfo.primaryExtension);
+      } else {
+        params.mimeInfo = handlerInfo.wrappedHandlerInfo;
+      }
+
+      params.title         = this._prefsBundle.getString("fpTitleChooseApp");
+      params.description   = handlerInfo.description;
+      params.filename      = null;
+      params.handlerApp    = null;
+
+      let onAppSelected = () => {
+        if (this.isValidHandlerApp(params.handlerApp)) {
+          handlerApp = params.handlerApp;
+
+          // Add the app to the type's list of possible handlers.
+          handlerInfo.addPossibleApplicationHandler(handlerApp);
+        }
+
+        chooseAppCallback(handlerApp);
+      };
+
+      gSubDialog.open("chrome://global/content/appPicker.xul",
+                      null, params, onAppSelected);
+    } else {
+      let winTitle = this._prefsBundle.getString("fpTitleChooseApp");
+      let fp = Cc["@mozilla.org/filepicker;1"].createInstance(Ci.nsIFilePicker);
+      let fpCallback = aResult => {
+        if (aResult == Ci.nsIFilePicker.returnOK && fp.file &&
+            this._isValidHandlerExecutable(fp.file)) {
+          handlerApp = Cc["@mozilla.org/uriloader/local-handler-app;1"].
+                       createInstance(Ci.nsILocalHandlerApp);
+          handlerApp.name = getFileDisplayName(fp.file);
+          handlerApp.executable = fp.file;
+
+          // Add the app to the type's list of possible handlers.
+          let handler = this._handledTypes[this._list.selectedItem.type];
+          handler.addPossibleApplicationHandler(handlerApp);
+
+          chooseAppCallback(handlerApp);
+        }
+      };
+
+      // Prompt the user to pick an app.  If they pick one, and it's a valid
+      // selection, then add it to the list of possible handlers.
+      fp.init(window, winTitle, Ci.nsIFilePicker.modeOpen);
+      fp.appendFilters(Ci.nsIFilePicker.filterApps);
+      fp.open(fpCallback);
+    }
+  },
+
+  // Mark which item in the list was last selected so we can reselect it
+  // when we rebuild the list or when the user returns to the prefpane.
+  onSelectionChanged() {
+    if (this._list.selectedItem)
+      this._list.setAttribute("lastSelectedType",
+                              this._list.selectedItem.getAttribute("type"));
+  },
+
+  _setIconClassForPreferredAction(aHandlerInfo, aElement) {
+    // If this returns true, the attribute that CSS sniffs for was set to something
+    // so you shouldn't manually set an icon URI.
+    // This removes the existing actionIcon attribute if any, even if returning false.
+    aElement.removeAttribute("actionIcon");
+
+    if (aHandlerInfo.alwaysAskBeforeHandling) {
+      aElement.setAttribute(APP_ICON_ATTR_NAME, "ask");
+      return true;
+    }
+
+    switch (aHandlerInfo.preferredAction) {
+      case Ci.nsIHandlerInfo.saveToDisk:
+        aElement.setAttribute(APP_ICON_ATTR_NAME, "save");
+        return true;
+
+      case Ci.nsIHandlerInfo.handleInternally:
+        if (isFeedType(aHandlerInfo.type)) {
+          aElement.setAttribute(APP_ICON_ATTR_NAME, "feed");
+          return true;
+        } else if (aHandlerInfo instanceof InternalHandlerInfoWrapper) {
+          aElement.setAttribute(APP_ICON_ATTR_NAME, "ask");
+          return true;
+        }
         break;
-      case "engine-removed":
-        gMainPane.remove(aEngine);
-        break;
-      case "engine-current":
-        // If the user is going through the drop down using up/down keys, the
-        // dropdown may still be open (eg. on Windows) when engine-current is
-        // fired, so rebuilding the list unconditionally would get in the way.
-        let selectedEngine =
-          document.getElementById("defaultEngine").selectedItem.engine;
-        if (selectedEngine.name != aEngine.name)
-          gMainPane.buildDefaultEngineDropDown();
-        break;
-      case "engine-default":
-        // Not relevant
+
+      case kActionUsePlugin:
+        aElement.setAttribute(APP_ICON_ATTR_NAME, "plugin");
+        return true;
+    }
+    aElement.removeAttribute(APP_ICON_ATTR_NAME);
+    return false;
+  },
+
+  _getIconURLForPreferredAction(aHandlerInfo) {
+    switch (aHandlerInfo.preferredAction) {
+      case Ci.nsIHandlerInfo.useSystemDefault:
+        return this._getIconURLForSystemDefault(aHandlerInfo);
+
+      case Ci.nsIHandlerInfo.useHelperApp:
+        let preferredApp = aHandlerInfo.preferredApplicationHandler;
+        if (this.isValidHandlerApp(preferredApp))
+          return this._getIconURLForHandlerApp(preferredApp);
+        // Explicit fall-through
+
+      // This should never happen, but if preferredAction is set to some weird
+      // value, then fall back to the generic application icon.
+      default:
+        return ICON_URL_APP;
+    }
+  },
+
+  _getIconURLForHandlerApp(aHandlerApp) {
+    if (aHandlerApp instanceof Ci.nsILocalHandlerApp)
+      return this._getIconURLForFile(aHandlerApp.executable);
+
+    if (aHandlerApp instanceof Ci.nsIWebHandlerApp)
+      return this._getIconURLForWebApp(aHandlerApp.uriTemplate);
+
+    if (aHandlerApp instanceof Ci.nsIWebContentHandlerInfo)
+      return this._getIconURLForWebApp(aHandlerApp.uri)
+
+    // We know nothing about other kinds of handler apps.
+    return "";
+  },
+
+  _getIconURLForFile(aFile) {
+    var fph = this._ioSvc.getProtocolHandler("file").
+              QueryInterface(Ci.nsIFileProtocolHandler);
+    var urlSpec = fph.getURLSpecFromFile(aFile);
+
+    return "moz-icon://" + urlSpec + "?size=16";
+  },
+
+  _getIconURLForWebApp(aWebAppURITemplate) {
+    var uri = this._ioSvc.newURI(aWebAppURITemplate);
+
+    // Unfortunately we can't use the favicon service to get the favicon,
+    // because the service looks in the annotations table for a record with
+    // the exact URL we give it, and users won't have such records for URLs
+    // they don't visit, and users won't visit the web app's URL template,
+    // they'll only visit URLs derived from that template (i.e. with %s
+    // in the template replaced by the URL of the content being handled).
+
+    if (/^https?$/.test(uri.scheme) && this._prefSvc.getBoolPref("browser.chrome.favicons"))
+      return uri.prePath + "/favicon.ico";
+
+    return "";
+  },
+
+  _getIconURLForSystemDefault(aHandlerInfo) {
+    // Handler info objects for MIME types on some OSes implement a property bag
+    // interface from which we can get an icon for the default app, so if we're
+    // dealing with a MIME type on one of those OSes, then try to get the icon.
+    if ("wrappedHandlerInfo" in aHandlerInfo) {
+      let wrappedHandlerInfo = aHandlerInfo.wrappedHandlerInfo;
+
+      if (wrappedHandlerInfo instanceof Ci.nsIMIMEInfo &&
+          wrappedHandlerInfo instanceof Ci.nsIPropertyBag) {
+        try {
+          let url = wrappedHandlerInfo.getProperty("defaultApplicationIconURL");
+          if (url)
+            return url + "?size=16";
+        } catch (ex) {}
+      }
+    }
+
+    // If this isn't a MIME type object on an OS that supports retrieving
+    // the icon, or if we couldn't retrieve the icon for some other reason,
+    // then use a generic icon.
+    return ICON_URL_APP;
+  },
+
+  // DOWNLOADS
+
+  /*
+   * Preferences:
+   *
+   * browser.download.useDownloadDir - bool
+   *   True - Save files directly to the folder configured via the
+   *   browser.download.folderList preference.
+   *   False - Always ask the user where to save a file and default to
+   *   browser.download.lastDir when displaying a folder picker dialog.
+   * browser.download.dir - local file handle
+   *   A local folder the user may have selected for downloaded files to be
+   *   saved. Migration of other browser settings may also set this path.
+   *   This folder is enabled when folderList equals 2.
+   * browser.download.lastDir - local file handle
+   *   May contain the last folder path accessed when the user browsed
+   *   via the file save-as dialog. (see contentAreaUtils.js)
+   * browser.download.folderList - int
+   *   Indicates the location users wish to save downloaded files too.
+   *   It is also used to display special file labels when the default
+   *   download location is either the Desktop or the Downloads folder.
+   *   Values:
+   *     0 - The desktop is the default download location.
+   *     1 - The system's downloads folder is the default download location.
+   *     2 - The default download location is elsewhere as specified in
+   *         browser.download.dir.
+   * browser.download.downloadDir
+   *   deprecated.
+   * browser.download.defaultFolder
+   *   deprecated.
+   */
+
+  /**
+   * Enables/disables the folder field and Browse button based on whether a
+   * default download directory is being used.
+   */
+  readUseDownloadDir() {
+    var downloadFolder = document.getElementById("downloadFolder");
+    var chooseFolder = document.getElementById("chooseFolder");
+    var preference = document.getElementById("browser.download.useDownloadDir");
+    downloadFolder.disabled = !preference.value || preference.locked;
+    chooseFolder.disabled = !preference.value || preference.locked;
+
+    // don't override the preference's value in UI
+    return undefined;
+  },
+
+  /**
+   * Displays a file picker in which the user can choose the location where
+   * downloads are automatically saved, updating preferences and UI in
+   * response to the choice, if one is made.
+   */
+  chooseFolder() {
+    return this.chooseFolderTask().catch(Components.utils.reportError);
+  },
+  async chooseFolderTask() {
+    let bundlePreferences = document.getElementById("bundlePreferences");
+    let title = bundlePreferences.getString("chooseDownloadFolderTitle");
+    let folderListPref = document.getElementById("browser.download.folderList");
+    let currentDirPref = await this._indexToFolder(folderListPref.value);
+    let defDownloads = await this._indexToFolder(1);
+    let fp = Components.classes["@mozilla.org/filepicker;1"].
+             createInstance(Components.interfaces.nsIFilePicker);
+
+    fp.init(window, title, Components.interfaces.nsIFilePicker.modeGetFolder);
+    fp.appendFilters(Components.interfaces.nsIFilePicker.filterAll);
+    // First try to open what's currently configured
+    if (currentDirPref && currentDirPref.exists()) {
+      fp.displayDirectory = currentDirPref;
+    } else if (defDownloads && defDownloads.exists()) {
+      // Try the system's download dir
+      fp.displayDirectory = defDownloads;
+    } else {
+      // Fall back to Desktop
+      fp.displayDirectory = await this._indexToFolder(0);
+    }
+
+    let result = await new Promise(resolve => fp.open(resolve));
+    if (result != Components.interfaces.nsIFilePicker.returnOK) {
+      return;
+    }
+
+    let downloadDirPref = document.getElementById("browser.download.dir");
+    downloadDirPref.value = fp.file;
+    folderListPref.value = await this._folderToIndex(fp.file);
+    // Note, the real prefs will not be updated yet, so dnld manager's
+    // userDownloadsDirectory may not return the right folder after
+    // this code executes. displayDownloadDirPref will be called on
+    // the assignment above to update the UI.
+  },
+
+  /**
+   * Initializes the download folder display settings based on the user's
+   * preferences.
+   */
+  displayDownloadDirPref() {
+    this.displayDownloadDirPrefTask().catch(Components.utils.reportError);
+
+    // don't override the preference's value in UI
+    return undefined;
+  },
+
+  async displayDownloadDirPrefTask() {
+    var folderListPref = document.getElementById("browser.download.folderList");
+    var bundlePreferences = document.getElementById("bundlePreferences");
+    var downloadFolder = document.getElementById("downloadFolder");
+    var currentDirPref = document.getElementById("browser.download.dir");
+
+    // Used in defining the correct path to the folder icon.
+    var ios = Components.classes["@mozilla.org/network/io-service;1"]
+                        .getService(Components.interfaces.nsIIOService);
+    var fph = ios.getProtocolHandler("file")
+                 .QueryInterface(Components.interfaces.nsIFileProtocolHandler);
+    var iconUrlSpec;
+
+    // Display a 'pretty' label or the path in the UI.
+    if (folderListPref.value == 2) {
+      // Custom path selected and is configured
+      downloadFolder.label = this._getDisplayNameOfFile(currentDirPref.value);
+      iconUrlSpec = fph.getURLSpecFromFile(currentDirPref.value);
+    } else if (folderListPref.value == 1) {
+      // 'Downloads'
+      downloadFolder.label = bundlePreferences.getString("downloadsFolderName");
+      iconUrlSpec = fph.getURLSpecFromFile(await this._indexToFolder(1));
+    } else {
+      // 'Desktop'
+      downloadFolder.label = bundlePreferences.getString("desktopFolderName");
+      iconUrlSpec = fph.getURLSpecFromFile(await this._getDownloadsFolder("Desktop"));
+    }
+    downloadFolder.image = "moz-icon://" + iconUrlSpec + "?size=16";
+  },
+
+  /**
+   * Returns the textual path of a folder in readable form.
+   */
+  _getDisplayNameOfFile(aFolder) {
+    // TODO: would like to add support for 'Downloads on Macintosh HD'
+    //       for OS X users.
+    return aFolder ? aFolder.path : "";
+  },
+
+  /**
+   * Returns the Downloads folder.  If aFolder is "Desktop", then the Downloads
+   * folder returned is the desktop folder; otherwise, it is a folder whose name
+   * indicates that it is a download folder and whose path is as determined by
+   * the XPCOM directory service via the download manager's attribute
+   * defaultDownloadsDirectory.
+   *
+   * @throws if aFolder is not "Desktop" or "Downloads"
+   */
+  async _getDownloadsFolder(aFolder) {
+    switch (aFolder) {
+      case "Desktop":
+        var fileLoc = Components.classes["@mozilla.org/file/directory_service;1"]
+                                    .getService(Components.interfaces.nsIProperties);
+        return fileLoc.get("Desk", Components.interfaces.nsILocalFile);
+      case "Downloads":
+        let downloadsDir = await Downloads.getSystemDownloadsDirectory();
+        return new FileUtils.File(downloadsDir);
+    }
+    throw "ASSERTION FAILED: folder type should be 'Desktop' or 'Downloads'";
+  },
+
+  /**
+   * Determines the type of the given folder.
+   *
+   * @param   aFolder
+   *          the folder whose type is to be determined
+   * @returns integer
+   *          0 if aFolder is the Desktop or is unspecified,
+   *          1 if aFolder is the Downloads folder,
+   *          2 otherwise
+   */
+  async _folderToIndex(aFolder) {
+    if (!aFolder || aFolder.equals(await this._getDownloadsFolder("Desktop")))
+      return 0;
+    else if (aFolder.equals(await this._getDownloadsFolder("Downloads")))
+      return 1;
+    return 2;
+  },
+
+  /**
+   * Converts an integer into the corresponding folder.
+   *
+   * @param   aIndex
+   *          an integer
+   * @returns the Desktop folder if aIndex == 0,
+   *          the Downloads folder if aIndex == 1,
+   *          the folder stored in browser.download.dir
+   */
+  _indexToFolder(aIndex) {
+    switch (aIndex) {
+      case 0:
+        return this._getDownloadsFolder("Desktop");
+      case 1:
+        return this._getDownloadsFolder("Downloads");
+    }
+    var currentDirPref = document.getElementById("browser.download.dir");
+    return currentDirPref.value;
+  }
+};
+
+// Utilities
+
+function getFileDisplayName(file) {
+  if (AppConstants.platform == "win") {
+    if (file instanceof Ci.nsILocalFileWin) {
+      try {
+        return file.getVersionInfoField("FileDescription");
+      } catch (e) {}
+    }
+  }
+  if (AppConstants.platform == "macosx") {
+    if (file instanceof Ci.nsILocalFileMac) {
+      try {
+        return file.bundleDisplayName;
+      } catch (e) {}
+    }
+  }
+  return file.leafName;
+}
+
+function getLocalHandlerApp(aFile) {
+  var localHandlerApp = Cc["@mozilla.org/uriloader/local-handler-app;1"].
+                        createInstance(Ci.nsILocalHandlerApp);
+  localHandlerApp.name = getFileDisplayName(aFile);
+  localHandlerApp.executable = aFile;
+
+  return localHandlerApp;
+}
+
+/**
+ * An enumeration of items in a JS array.
+ *
+ * FIXME: use ArrayConverter once it lands (bug 380839).
+ *
+ * @constructor
+ */
+function ArrayEnumerator(aItems) {
+  this._index = 0;
+  this._contents = aItems;
+}
+
+ArrayEnumerator.prototype = {
+  _index: 0,
+
+  hasMoreElements() {
+    return this._index < this._contents.length;
+  },
+
+  getNext() {
+    return this._contents[this._index++];
+  }
+};
+
+function isFeedType(t) {
+  return t == TYPE_MAYBE_FEED || t == TYPE_MAYBE_VIDEO_FEED || t == TYPE_MAYBE_AUDIO_FEED;
+}
+
+// HandlerInfoWrapper
+
+/**
+ * This object wraps nsIHandlerInfo with some additional functionality
+ * the Applications prefpane needs to display and allow modification of
+ * the list of handled types.
+ *
+ * We create an instance of this wrapper for each entry we might display
+ * in the prefpane, and we compose the instances from various sources,
+ * including plugins and the handler service.
+ *
+ * We don't implement all the original nsIHandlerInfo functionality,
+ * just the stuff that the prefpane needs.
+ *
+ * In theory, all of the custom functionality in this wrapper should get
+ * pushed down into nsIHandlerInfo eventually.
+ */
+function HandlerInfoWrapper(aType, aHandlerInfo) {
+  this._type = aType;
+  this.wrappedHandlerInfo = aHandlerInfo;
+}
+
+HandlerInfoWrapper.prototype = {
+  // The wrapped nsIHandlerInfo object.  In general, this object is private,
+  // but there are a couple cases where callers access it directly for things
+  // we haven't (yet?) implemented, so we make it a public property.
+  wrappedHandlerInfo: null,
+
+
+  // Convenience Utils
+
+  _handlerSvc: Cc["@mozilla.org/uriloader/handler-service;1"].
+               getService(Ci.nsIHandlerService),
+
+  _prefSvc: Cc["@mozilla.org/preferences-service;1"].
+            getService(Ci.nsIPrefBranch),
+
+  _categoryMgr: Cc["@mozilla.org/categorymanager;1"].
+                getService(Ci.nsICategoryManager),
+
+  element(aID) {
+    return document.getElementById(aID);
+  },
+
+
+  // nsIHandlerInfo
+
+  // The MIME type or protocol scheme.
+  _type: null,
+  get type() {
+    return this._type;
+  },
+
+  get description() {
+    if (this.wrappedHandlerInfo.description)
+      return this.wrappedHandlerInfo.description;
+
+    if (this.primaryExtension) {
+      var extension = this.primaryExtension.toUpperCase();
+      return this.element("bundlePreferences").getFormattedString("fileEnding",
+                                                                  [extension]);
+    }
+
+    return this.type;
+  },
+
+  get preferredApplicationHandler() {
+    return this.wrappedHandlerInfo.preferredApplicationHandler;
+  },
+
+  set preferredApplicationHandler(aNewValue) {
+    this.wrappedHandlerInfo.preferredApplicationHandler = aNewValue;
+
+    // Make sure the preferred handler is in the set of possible handlers.
+    if (aNewValue)
+      this.addPossibleApplicationHandler(aNewValue)
+  },
+
+  get possibleApplicationHandlers() {
+    return this.wrappedHandlerInfo.possibleApplicationHandlers;
+  },
+
+  addPossibleApplicationHandler(aNewHandler) {
+    var possibleApps = this.possibleApplicationHandlers.enumerate();
+    while (possibleApps.hasMoreElements()) {
+      if (possibleApps.getNext().equals(aNewHandler))
+        return;
+    }
+    this.possibleApplicationHandlers.appendElement(aNewHandler);
+  },
+
+  removePossibleApplicationHandler(aHandler) {
+    var defaultApp = this.preferredApplicationHandler;
+    if (defaultApp && aHandler.equals(defaultApp)) {
+      // If the app we remove was the default app, we must make sure
+      // it won't be used anymore
+      this.alwaysAskBeforeHandling = true;
+      this.preferredApplicationHandler = null;
+    }
+
+    var handlers = this.possibleApplicationHandlers;
+    for (var i = 0; i < handlers.length; ++i) {
+      var handler = handlers.queryElementAt(i, Ci.nsIHandlerApp);
+      if (handler.equals(aHandler)) {
+        handlers.removeElementAt(i);
         break;
       }
     }
   },
 
-  onInputBlur(aEvent) {
-    let tree = document.getElementById("engineList");
-    if (!tree.hasAttribute("editing"))
-      return;
-
-    // Accept input unless discarded.
-    let accept = aEvent.charCode != KeyEvent.DOM_VK_ESCAPE;
-    tree.stopEditing(accept);
+  get hasDefaultHandler() {
+    return this.wrappedHandlerInfo.hasDefaultHandler;
+  },
+
+  get defaultDescription() {
+    return this.wrappedHandlerInfo.defaultDescription;
+  },
+
+  // What to do with content of this type.
+  get preferredAction() {
+    // If we have an enabled plugin, then the action is to use that plugin.
+    if (this.pluginName && !this.isDisabledPluginType)
+      return kActionUsePlugin;
+
+    // If the action is to use a helper app, but we don't have a preferred
+    // handler app, then switch to using the system default, if any; otherwise
+    // fall back to saving to disk, which is the default action in nsMIMEInfo.
+    // Note: "save to disk" is an invalid value for protocol info objects,
+    // but the alwaysAskBeforeHandling getter will detect that situation
+    // and always return true in that case to override this invalid value.
+    if (this.wrappedHandlerInfo.preferredAction == Ci.nsIHandlerInfo.useHelperApp &&
+        !gMainPane.isValidHandlerApp(this.preferredApplicationHandler)) {
+      if (this.wrappedHandlerInfo.hasDefaultHandler)
+        return Ci.nsIHandlerInfo.useSystemDefault;
+      return Ci.nsIHandlerInfo.saveToDisk;
+    }
+
+    return this.wrappedHandlerInfo.preferredAction;
+  },
+
+  set preferredAction(aNewValue) {
+    // If the action is to use the plugin,
+    // we must set the preferred action to "save to disk".
+    // But only if it's not currently the preferred action.
+    if ((aNewValue == kActionUsePlugin) &&
+        (this.preferredAction != Ci.nsIHandlerInfo.saveToDisk)) {
+      aNewValue = Ci.nsIHandlerInfo.saveToDisk;
+    }
+
+    // We don't modify the preferred action if the new action is to use a plugin
+    // because handler info objects don't understand our custom "use plugin"
+    // value.  Also, leaving it untouched means that we can automatically revert
+    // to the old setting if the user ever removes the plugin.
+
+    if (aNewValue != kActionUsePlugin)
+      this.wrappedHandlerInfo.preferredAction = aNewValue;
   },
 
-  onTreeSelect() {
-    document.getElementById("removeEngineButton").disabled =
-      !gEngineView.isEngineSelectedAndRemovable();
+  get alwaysAskBeforeHandling() {
+    // If this type is handled only by a plugin, we can't trust the value
+    // in the handler info object, since it'll be a default based on the absence
+    // of any user configuration, and the default in that case is to always ask,
+    // even though we never ask for content handled by a plugin, so special case
+    // plugin-handled types by returning false here.
+    if (this.pluginName && this.handledOnlyByPlugin)
+      return false;
+
+    // If this is a protocol type and the preferred action is "save to disk",
+    // which is invalid for such types, then return true here to override that
+    // action.  This could happen when the preferred action is to use a helper
+    // app, but the preferredApplicationHandler is invalid, and there isn't
+    // a default handler, so the preferredAction getter returns save to disk
+    // instead.
+    if (!(this.wrappedHandlerInfo instanceof Ci.nsIMIMEInfo) &&
+        this.preferredAction == Ci.nsIHandlerInfo.saveToDisk)
+      return true;
+
+    return this.wrappedHandlerInfo.alwaysAskBeforeHandling;
+  },
+
+  set alwaysAskBeforeHandling(aNewValue) {
+    this.wrappedHandlerInfo.alwaysAskBeforeHandling = aNewValue;
+  },
+
+
+  // nsIMIMEInfo
+
+  // The primary file extension associated with this type, if any.
+  //
+  // XXX Plugin objects contain an array of MimeType objects with "suffixes"
+  // properties; if this object has an associated plugin, shouldn't we check
+  // those properties for an extension?
+  get primaryExtension() {
+    try {
+      if (this.wrappedHandlerInfo instanceof Ci.nsIMIMEInfo &&
+          this.wrappedHandlerInfo.primaryExtension)
+        return this.wrappedHandlerInfo.primaryExtension
+    } catch (ex) {}
+
+    return null;
+  },
+
+
+  // Plugin Handling
+
+  // A plugin that can handle this type, if any.
+  //
+  // Note: just because we have one doesn't mean it *will* handle the type.
+  // That depends on whether or not the type is in the list of types for which
+  // plugin handling is disabled.
+  plugin: null,
+
+  // Whether or not this type is only handled by a plugin or is also handled
+  // by some user-configured action as specified in the handler info object.
+  //
+  // Note: we can't just check if there's a handler info object for this type,
+  // because OS and user configuration is mixed up in the handler info object,
+  // so we always need to retrieve it for the OS info and can't tell whether
+  // it represents only OS-default information or user-configured information.
+  //
+  // FIXME: once handler info records are broken up into OS-provided records
+  // and user-configured records, stop using this boolean flag and simply
+  // check for the presence of a user-configured record to determine whether
+  // or not this type is only handled by a plugin.  Filed as bug 395142.
+  handledOnlyByPlugin: undefined,
+
+  get isDisabledPluginType() {
+    return this._getDisabledPluginTypes().indexOf(this.type) != -1;
+  },
+
+  _getDisabledPluginTypes() {
+    var types = "";
+
+    if (this._prefSvc.prefHasUserValue(PREF_DISABLED_PLUGIN_TYPES))
+      types = this._prefSvc.getCharPref(PREF_DISABLED_PLUGIN_TYPES);
+
+    // Only split if the string isn't empty so we don't end up with an array
+    // containing a single empty string.
+    if (types != "")
+      return types.split(",");
+
+    return [];
   },
 
-  onTreeKeyPress(aEvent) {
-    let index = gEngineView.selectedIndex;
-    let tree = document.getElementById("engineList");
-    if (tree.hasAttribute("editing"))
-      return;
-
-    if (aEvent.charCode == KeyEvent.DOM_VK_SPACE) {
-      // Space toggles the checkbox.
-      let newValue = !gEngineView._engineStore.engines[index].shown;
-      gEngineView.setCellValue(index, tree.columns.getFirstColumn(),
-                               newValue.toString());
-      // Prevent page from scrolling on the space key.
-      aEvent.preventDefault();
-    } else {
-      let isMac = Services.appinfo.OS == "Darwin";
-      if ((isMac && aEvent.keyCode == KeyEvent.DOM_VK_RETURN) ||
-          (!isMac && aEvent.keyCode == KeyEvent.DOM_VK_F2)) {
-        tree.startEditing(index, tree.columns.getLastColumn());
-      } else if (aEvent.keyCode == KeyEvent.DOM_VK_DELETE ||
-                 (isMac && aEvent.shiftKey &&
-                  aEvent.keyCode == KeyEvent.DOM_VK_BACK_SPACE &&
-                  gEngineView.isEngineSelectedAndRemovable())) {
-        // Delete and Shift+Backspace (Mac) removes selected engine.
-        Services.search.removeEngine(gEngineView.selectedEngine.originalEngine);
-     }
+  disablePluginType() {
+    var disabledPluginTypes = this._getDisabledPluginTypes();
+
+    if (disabledPluginTypes.indexOf(this.type) == -1)
+      disabledPluginTypes.push(this.type);
+
+    this._prefSvc.setCharPref(PREF_DISABLED_PLUGIN_TYPES,
+                              disabledPluginTypes.join(","));
+
+    // Update the category manager so existing browser windows update.
+    this._categoryMgr.deleteCategoryEntry("Gecko-Content-Viewers",
+                                          this.type,
+                                          false);
+  },
+
+  enablePluginType() {
+    var disabledPluginTypes = this._getDisabledPluginTypes();
+
+    var type = this.type;
+    disabledPluginTypes = disabledPluginTypes.filter(v => v != type);
+
+    this._prefSvc.setCharPref(PREF_DISABLED_PLUGIN_TYPES,
+                              disabledPluginTypes.join(","));
+
+    // Update the category manager so existing browser windows update.
+    this._categoryMgr.
+      addCategoryEntry("Gecko-Content-Viewers",
+                       this.type,
+                       "@mozilla.org/content/plugin/document-loader-factory;1",
+                       false,
+                       true);
+  },
+
+
+  // Storage
+
+  store() {
+    this._handlerSvc.store(this.wrappedHandlerInfo);
+  },
+
+
+  // Icons
+
+  get smallIcon() {
+    return this._getIcon(16);
+  },
+
+  _getIcon(aSize) {
+    if (this.primaryExtension)
+      return "moz-icon://goat." + this.primaryExtension + "?size=" + aSize;
+
+    if (this.wrappedHandlerInfo instanceof Ci.nsIMIMEInfo)
+      return "moz-icon://goat?size=" + aSize + "&contentType=" + this.type;
+
+    // FIXME: consider returning some generic icon when we can't get a URL for
+    // one (for example in the case of protocol schemes).  Filed as bug 395141.
+    return null;
+  }
+
+};
+
+
+// Feed Handler Info
+
+/**
+ * This object implements nsIHandlerInfo for the feed types.  It's a separate
+ * object because we currently store handling information for the feed type
+ * in a set of preferences rather than the nsIHandlerService-managed datastore.
+ *
+ * This object inherits from HandlerInfoWrapper in order to get functionality
+ * that isn't special to the feed type.
+ *
+ * XXX Should we inherit from HandlerInfoWrapper?  After all, we override
+ * most of that wrapper's properties and methods, and we have to dance around
+ * the fact that the wrapper expects to have a wrappedHandlerInfo, which we
+ * don't provide.
+ */
+
+function FeedHandlerInfo(aMIMEType) {
+  HandlerInfoWrapper.call(this, aMIMEType, null);
+}
+
+FeedHandlerInfo.prototype = {
+  __proto__: HandlerInfoWrapper.prototype,
+
+  // Convenience Utils
+
+  _converterSvc:
+    Cc["@mozilla.org/embeddor.implemented/web-content-handler-registrar;1"].
+    getService(Ci.nsIWebContentConverterService),
+
+  _shellSvc: AppConstants.HAVE_SHELL_SERVICE ? getShellService() : null,
+
+  // nsIHandlerInfo
+
+  get description() {
+    return this.element("bundlePreferences").getString(this._appPrefLabel);
+  },
+
+  get preferredApplicationHandler() {
+    switch (this.element(this._prefSelectedReader).value) {
+      case "client":
+        var file = this.element(this._prefSelectedApp).value;
+        if (file)
+          return getLocalHandlerApp(file);
+
+        return null;
+
+      case "web":
+        var uri = this.element(this._prefSelectedWeb).value;
+        if (!uri)
+          return null;
+        return this._converterSvc.getWebContentHandlerByURI(this.type, uri);
+
+      case "bookmarks":
+      default:
+        // When the pref is set to bookmarks, we handle feeds internally,
+        // we don't forward them to a local or web handler app, so there is
+        // no preferred handler.
+        return null;
+    }
+  },
+
+  set preferredApplicationHandler(aNewValue) {
+    if (aNewValue instanceof Ci.nsILocalHandlerApp) {
+      this.element(this._prefSelectedApp).value = aNewValue.executable;
+      this.element(this._prefSelectedReader).value = "client";
+    } else if (aNewValue instanceof Ci.nsIWebContentHandlerInfo) {
+      this.element(this._prefSelectedWeb).value = aNewValue.uri;
+      this.element(this._prefSelectedReader).value = "web";
+      // Make the web handler be the new "auto handler" for feeds.
+      // Note: we don't have to unregister the auto handler when the user picks
+      // a non-web handler (local app, Live Bookmarks, etc.) because the service
+      // only uses the "auto handler" when the selected reader is a web handler.
+      // We also don't have to unregister it when the user turns on "always ask"
+      // (i.e. preview in browser), since that also overrides the auto handler.
+      this._converterSvc.setAutoHandler(this.type, aNewValue);
     }
   },
 
-  onRestoreDefaults() {
-    let num = gEngineView._engineStore.restoreDefaultEngines();
-    gEngineView.rowCountChanged(0, num);
-    gEngineView.invalidate();
-  },
-
-  showRestoreDefaults(aEnable) {
-    document.getElementById("restoreDefaultSearchEngines").disabled = !aEnable;
-  },
-
-  remove(aEngine) {
-    let index = gEngineView._engineStore.removeEngine(aEngine);
-    gEngineView.rowCountChanged(index, -1);
-    gEngineView.invalidate();
-    gEngineView.selection.select(Math.min(index, gEngineView.lastIndex));
-    gEngineView.ensureRowIsVisible(gEngineView.currentIndex);
-    document.getElementById("engineList").focus();
+  _possibleApplicationHandlers: null,
+
+  get possibleApplicationHandlers() {
+    if (this._possibleApplicationHandlers)
+      return this._possibleApplicationHandlers;
+
+    // A minimal implementation of nsIMutableArray.  It only supports the two
+    // methods its callers invoke, namely appendElement and nsIArray::enumerate.
+    this._possibleApplicationHandlers = {
+      _inner: [],
+      _removed: [],
+
+      QueryInterface(aIID) {
+        if (aIID.equals(Ci.nsIMutableArray) ||
+            aIID.equals(Ci.nsIArray) ||
+            aIID.equals(Ci.nsISupports))
+          return this;
+
+        throw Cr.NS_ERROR_NO_INTERFACE;
+      },
+
+      get length() {
+        return this._inner.length;
+      },
+
+      enumerate() {
+        return new ArrayEnumerator(this._inner);
+      },
+
+      appendElement(aHandlerApp, aWeak) {
+        this._inner.push(aHandlerApp);
+      },
+
+      removeElementAt(aIndex) {
+        this._removed.push(this._inner[aIndex]);
+        this._inner.splice(aIndex, 1);
+      },
+
+      queryElementAt(aIndex, aInterface) {
+        return this._inner[aIndex].QueryInterface(aInterface);
+      }
+    };
+
+    // Add the selected local app if it's different from the OS default handler.
+    // Unlike for other types, we can store only one local app at a time for the
+    // feed type, since we store it in a preference that historically stores
+    // only a single path.  But we display all the local apps the user chooses
+    // while the prefpane is open, only dropping the list when the user closes
+    // the prefpane, for maximum usability and consistency with other types.
+    var preferredAppFile = this.element(this._prefSelectedApp).value;
+    if (preferredAppFile) {
+      let preferredApp = getLocalHandlerApp(preferredAppFile);
+      let defaultApp = this._defaultApplicationHandler;
+      if (!defaultApp || !defaultApp.equals(preferredApp))
+        this._possibleApplicationHandlers.appendElement(preferredApp);
+    }
+
+    // Add the registered web handlers.  There can be any number of these.
+    var webHandlers = this._converterSvc.getContentHandlers(this.type);
+    for (let webHandler of webHandlers)
+      this._possibleApplicationHandlers.appendElement(webHandler);
+
+    return this._possibleApplicationHandlers;
   },
 
-  async editKeyword(aEngine, aNewKeyword) {
-    let keyword = aNewKeyword.trim();
-    if (keyword) {
-      let eduplicate = false;
-      let dupName = "";
-
-      // Check for duplicates in Places keywords.
-      let bduplicate = !!(await PlacesUtils.keywords.fetch(keyword));
-
-      // Check for duplicates in changes we haven't committed yet
-      let engines = gEngineView._engineStore.engines;
-      let lc_keyword = keyword.toLocaleLowerCase();
-      for (let engine of engines) {
-        if (engine.alias &&
-            engine.alias.toLocaleLowerCase() == lc_keyword &&
-            engine.name != aEngine.name) {
-          eduplicate = true;
-          dupName = engine.name;
-          break;
-        }
+  __defaultApplicationHandler: undefined,
+  get _defaultApplicationHandler() {
+    if (typeof this.__defaultApplicationHandler != "undefined")
+      return this.__defaultApplicationHandler;
+
+    var defaultFeedReader = null;
+    if (AppConstants.HAVE_SHELL_SERVICE) {
+      try {
+        defaultFeedReader = this._shellSvc.defaultFeedReader;
+      } catch (ex) {
+        // no default reader or _shellSvc is null
       }
-
-      // Notify the user if they have chosen an existing engine/bookmark keyword
-      if (eduplicate || bduplicate) {
-        let strings = document.getElementById("engineManagerBundle");
-        let dtitle = strings.getString("duplicateTitle");
-        let bmsg = strings.getString("duplicateBookmarkMsg");
-        let emsg = strings.getFormattedString("duplicateEngineMsg", [dupName]);
-
-        Services.prompt.alert(window, dtitle, eduplicate ? emsg : bmsg);
-        return false;
+    }
+
+    if (defaultFeedReader) {
+      let handlerApp = Cc["@mozilla.org/uriloader/local-handler-app;1"].
+                       createInstance(Ci.nsIHandlerApp);
+      handlerApp.name = getFileDisplayName(defaultFeedReader);
+      handlerApp.QueryInterface(Ci.nsILocalHandlerApp);
+      handlerApp.executable = defaultFeedReader;
+
+      this.__defaultApplicationHandler = handlerApp;
+    } else {
+      this.__defaultApplicationHandler = null;
+    }
+
+    return this.__defaultApplicationHandler;
+  },
+
+  get hasDefaultHandler() {
+    if (AppConstants.HAVE_SHELL_SERVICE) {
+      try {
+        if (this._shellSvc.defaultFeedReader)
+          return true;
+      } catch (ex) {
+        // no default reader or _shellSvc is null
       }
     }
 
-    gEngineView._engineStore.changeEngine(aEngine, "alias", keyword);
-    gEngineView.invalidate();
-    return true;
+    return false;
+  },
+
+  get defaultDescription() {
+    if (this.hasDefaultHandler)
+      return this._defaultApplicationHandler.name;
+
+    // Should we instead return null?
+    return "";
+  },
+
+  // What to do with content of this type.
+  get preferredAction() {
+    switch (this.element(this._prefSelectedAction).value) {
+
+      case "bookmarks":
+        return Ci.nsIHandlerInfo.handleInternally;
+
+      case "reader": {
+        let preferredApp = this.preferredApplicationHandler;
+        let defaultApp = this._defaultApplicationHandler;
+
+        // If we have a valid preferred app, return useSystemDefault if it's
+        // the default app; otherwise return useHelperApp.
+        if (gMainPane.isValidHandlerApp(preferredApp)) {
+          if (defaultApp && defaultApp.equals(preferredApp))
+            return Ci.nsIHandlerInfo.useSystemDefault;
+
+          return Ci.nsIHandlerInfo.useHelperApp;
+        }
+
+        // The pref is set to "reader", but we don't have a valid preferred app.
+        // What do we do now?  Not sure this is the best option (perhaps we
+        // should direct the user to the default app, if any), but for now let's
+        // direct the user to live bookmarks.
+        return Ci.nsIHandlerInfo.handleInternally;
+      }
+
+      // If the action is "ask", then alwaysAskBeforeHandling will override
+      // the action, so it doesn't matter what we say it is, it just has to be
+      // something that doesn't cause the controller to hide the type.
+      case "ask":
+      default:
+        return Ci.nsIHandlerInfo.handleInternally;
+    }
+  },
+
+  set preferredAction(aNewValue) {
+    switch (aNewValue) {
+
+      case Ci.nsIHandlerInfo.handleInternally:
+        this.element(this._prefSelectedReader).value = "bookmarks";
+        break;
+
+      case Ci.nsIHandlerInfo.useHelperApp:
+        this.element(this._prefSelectedAction).value = "reader";
+        // The controller has already set preferredApplicationHandler
+        // to the new helper app.
+        break;
+
+      case Ci.nsIHandlerInfo.useSystemDefault:
+        this.element(this._prefSelectedAction).value = "reader";
+        this.preferredApplicationHandler = this._defaultApplicationHandler;
+        break;
+    }
+  },
+
+  get alwaysAskBeforeHandling() {
+    return this.element(this._prefSelectedAction).value == "ask";
+  },
+
+  set alwaysAskBeforeHandling(aNewValue) {
+    if (aNewValue == true)
+      this.element(this._prefSelectedAction).value = "ask";
+    else
+      this.element(this._prefSelectedAction).value = "reader";
+  },
+
+  // Whether or not we are currently storing the action selected by the user.
+  // We use this to suppress notification-triggered updates to the list when
+  // we make changes that may spawn such updates, specifically when we change
+  // the action for the feed type, which results in feed preference updates,
+  // which spawn "pref changed" notifications that would otherwise cause us
+  // to rebuild the view unnecessarily.
+  _storingAction: false,
+
+
+  // nsIMIMEInfo
+
+  get primaryExtension() {
+    return "xml";
   },
 
-  saveOneClickEnginesList() {
-    let hiddenList = [];
-    for (let engine of gEngineView._engineStore.engines) {
-      if (!engine.shown)
-        hiddenList.push(engine.name);
+
+  // Storage
+
+  // Changes to the preferred action and handler take effect immediately
+  // (we write them out to the preferences right as they happen),
+  // so we when the controller calls store() after modifying the handlers,
+  // the only thing we need to store is the removal of possible handlers
+  // XXX Should we hold off on making the changes until this method gets called?
+  store() {
+    for (let app of this._possibleApplicationHandlers._removed) {
+      if (app instanceof Ci.nsILocalHandlerApp) {
+        let pref = this.element(PREF_FEED_SELECTED_APP);
+        var preferredAppFile = pref.value;
+        if (preferredAppFile) {
+          let preferredApp = getLocalHandlerApp(preferredAppFile);
+          if (app.equals(preferredApp))
+            pref.reset();
+        }
+      } else {
+        app.QueryInterface(Ci.nsIWebContentHandlerInfo);
+        this._converterSvc.removeContentHandler(app.contentType, app.uri);
+      }
     }
-    document.getElementById("browser.search.hiddenOneOffs").value =
-      hiddenList.join(",");
+    this._possibleApplicationHandlers._removed = [];
   },
 
-  setDefaultEngine() {
-    Services.search.currentEngine =
-      document.getElementById("defaultEngine").selectedItem.engine;
+
+  // Icons
+
+  get smallIcon() {
+    return this._smallIcon;
+  }
+
+};
+
+var feedHandlerInfo = {
+  __proto__: new FeedHandlerInfo(TYPE_MAYBE_FEED),
+  _prefSelectedApp: PREF_FEED_SELECTED_APP,
+  _prefSelectedWeb: PREF_FEED_SELECTED_WEB,
+  _prefSelectedAction: PREF_FEED_SELECTED_ACTION,
+  _prefSelectedReader: PREF_FEED_SELECTED_READER,
+  _smallIcon: "chrome://browser/skin/feeds/feedIcon16.png",
+  _appPrefLabel: "webFeed"
+}
+
+var videoFeedHandlerInfo = {
+  __proto__: new FeedHandlerInfo(TYPE_MAYBE_VIDEO_FEED),
+  _prefSelectedApp: PREF_VIDEO_FEED_SELECTED_APP,
+  _prefSelectedWeb: PREF_VIDEO_FEED_SELECTED_WEB,
+  _prefSelectedAction: PREF_VIDEO_FEED_SELECTED_ACTION,
+  _prefSelectedReader: PREF_VIDEO_FEED_SELECTED_READER,
+  _smallIcon: "chrome://browser/skin/feeds/videoFeedIcon16.png",
+  _appPrefLabel: "videoPodcastFeed"
+}
+
+var audioFeedHandlerInfo = {
+  __proto__: new FeedHandlerInfo(TYPE_MAYBE_AUDIO_FEED),
+  _prefSelectedApp: PREF_AUDIO_FEED_SELECTED_APP,
+  _prefSelectedWeb: PREF_AUDIO_FEED_SELECTED_WEB,
+  _prefSelectedAction: PREF_AUDIO_FEED_SELECTED_ACTION,
+  _prefSelectedReader: PREF_AUDIO_FEED_SELECTED_READER,
+  _smallIcon: "chrome://browser/skin/feeds/audioFeedIcon16.png",
+  _appPrefLabel: "audioPodcastFeed"
+}
+
+/**
+ * InternalHandlerInfoWrapper provides a basic mechanism to create an internal
+ * mime type handler that can be enabled/disabled in the applications preference
+ * menu.
+ */
+function InternalHandlerInfoWrapper(aMIMEType) {
+  var mimeSvc = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService);
+  var handlerInfo = mimeSvc.getFromTypeAndExtension(aMIMEType, null);
+
+  HandlerInfoWrapper.call(this, aMIMEType, handlerInfo);
+}
+
+InternalHandlerInfoWrapper.prototype = {
+  __proto__: HandlerInfoWrapper.prototype,
+
+  // Override store so we so we can notify any code listening for registration
+  // or unregistration of this handler.
+  store() {
+    HandlerInfoWrapper.prototype.store.call(this);
+    Services.obs.notifyObservers(null, this._handlerChanged);
+  },
+
+  get enabled() {
+    throw Cr.NS_ERROR_NOT_IMPLEMENTED;
+  },
+
+  get description() {
+    return this.element("bundlePreferences").getString(this._appPrefLabel);
   }
 };
 
-function onDragEngineStart(event) {
-  var selectedIndex = gEngineView.selectedIndex;
-  var tree = document.getElementById("engineList");
-  var row = { }, col = { }, child = { };
-  tree.treeBoxObject.getCellAt(event.clientX, event.clientY, row, col, child);
-  if (selectedIndex >= 0 && !gEngineView.isCheckBox(row.value, col.value)) {
-    event.dataTransfer.setData(ENGINE_FLAVOR, selectedIndex.toString());
-    event.dataTransfer.effectAllowed = "move";
-  }
-}
-
-
-function EngineStore() {
-  let pref = document.getElementById("browser.search.hiddenOneOffs").value;
-  this.hiddenList = pref ? pref.split(",") : [];
-
-  this._engines = Services.search.getVisibleEngines().map(this._cloneEngine, this);
-  this._defaultEngines = Services.search.getDefaultEngines().map(this._cloneEngine, this);
-
-  // check if we need to disable the restore defaults button
-  var someHidden = this._defaultEngines.some(e => e.hidden);
-  gMainPane.showRestoreDefaults(someHidden);
-}
-EngineStore.prototype = {
-  _engines: null,
-  _defaultEngines: null,
-
-  get engines() {
-    return this._engines;
-  },
-  set engines(val) {
-    this._engines = val;
-    return val;
-  },
-
-  _getIndexForEngine(aEngine) {
-    return this._engines.indexOf(aEngine);
-  },
-
-  _getEngineByName(aName) {
-    return this._engines.find(engine => engine.name == aName);
-  },
-
-  _cloneEngine(aEngine) {
-    var clonedObj = {};
-    for (var i in aEngine)
-      clonedObj[i] = aEngine[i];
-    clonedObj.originalEngine = aEngine;
-    clonedObj.shown = this.hiddenList.indexOf(clonedObj.name) == -1;
-    return clonedObj;
-  },
-
-  // Callback for Array's some(). A thisObj must be passed to some()
-  _isSameEngine(aEngineClone) {
-    return aEngineClone.originalEngine == this.originalEngine;
-  },
-
-  addEngine(aEngine) {
-    this._engines.push(this._cloneEngine(aEngine));
+var pdfHandlerInfo = {
+  __proto__: new InternalHandlerInfoWrapper(TYPE_PDF),
+  _handlerChanged: TOPIC_PDFJS_HANDLER_CHANGED,
+  _appPrefLabel: "portableDocumentFormat",
+  get enabled() {
+    return !Services.prefs.getBoolPref(PREF_PDFJS_DISABLED);
   },
-
-  moveEngine(aEngine, aNewIndex) {
-    if (aNewIndex < 0 || aNewIndex > this._engines.length - 1)
-      throw new Error("ES_moveEngine: invalid aNewIndex!");
-    var index = this._getIndexForEngine(aEngine);
-    if (index == -1)
-      throw new Error("ES_moveEngine: invalid engine?");
-
-    if (index == aNewIndex)
-      return; // nothing to do
-
-    // Move the engine in our internal store
-    var removedEngine = this._engines.splice(index, 1)[0];
-    this._engines.splice(aNewIndex, 0, removedEngine);
-
-    Services.search.moveEngine(aEngine.originalEngine, aNewIndex);
-  },
-
-  removeEngine(aEngine) {
-    if (this._engines.length == 1) {
-      throw new Error("Cannot remove last engine!");
-    }
-
-    let engineName = aEngine.name;
-    let index = this._engines.findIndex(element => element.name == engineName);
-
-    if (index == -1)
-      throw new Error("invalid engine?");
-
-    let removedEngine = this._engines.splice(index, 1)[0];
-
-    if (this._defaultEngines.some(this._isSameEngine, removedEngine))
-      gMainPane.showRestoreDefaults(true);
-    gMainPane.buildDefaultEngineDropDown();
-    return index;
-  },
-
-  restoreDefaultEngines() {
-    var added = 0;
-
-    for (var i = 0; i < this._defaultEngines.length; ++i) {
-      var e = this._defaultEngines[i];
-
-      // If the engine is already in the list, just move it.
-      if (this._engines.some(this._isSameEngine, e)) {
-        this.moveEngine(this._getEngineByName(e.name), i);
-      } else {
-        // Otherwise, add it back to our internal store
-
-        // The search service removes the alias when an engine is hidden,
-        // so clear any alias we may have cached before unhiding the engine.
-        e.alias = "";
-
-        this._engines.splice(i, 0, e);
-        let engine = e.originalEngine;
-        engine.hidden = false;
-        Services.search.moveEngine(engine, i);
-        added++;
-      }
-    }
-    Services.search.resetToOriginalDefaultEngine();
-    gMainPane.showRestoreDefaults(false);
-    gMainPane.buildDefaultEngineDropDown();
-    return added;
-  },
-
-  changeEngine(aEngine, aProp, aNewValue) {
-    var index = this._getIndexForEngine(aEngine);
-    if (index == -1)
-      throw new Error("invalid engine?");
-
-    this._engines[index][aProp] = aNewValue;
-    aEngine.originalEngine[aProp] = aNewValue;
-  },
-
-  reloadIcons() {
-    this._engines.forEach(function(e) {
-      e.uri = e.originalEngine.uri;
-    });
-  }
 };
-
-function EngineView(aEngineStore) {
-  this._engineStore = aEngineStore;
-}
-EngineView.prototype = {
-  _engineStore: null,
-  tree: null,
-
-  get lastIndex() {
-    return this.rowCount - 1;
-  },
-  get selectedIndex() {
-    var seln = this.selection;
-    if (seln.getRangeCount() > 0) {
-      var min = {};
-      seln.getRangeAt(0, min, {});
-      return min.value;
-    }
-    return -1;
-  },
-  get selectedEngine() {
-    return this._engineStore.engines[this.selectedIndex];
-  },
-
-  // Helpers
-  rowCountChanged(index, count) {
-    this.tree.rowCountChanged(index, count);
-  },
-
-  invalidate() {
-    this.tree.invalidate();
-  },
-
-  ensureRowIsVisible(index) {
-    this.tree.ensureRowIsVisible(index);
-  },
-
-  getSourceIndexFromDrag(dataTransfer) {
-    return parseInt(dataTransfer.getData(ENGINE_FLAVOR));
-  },
-
-  isCheckBox(index, column) {
-    return column.id == "engineShown";
-  },
-
-  isEngineSelectedAndRemovable() {
-    return this.selectedIndex != -1 && this.lastIndex != 0;
-  },
-
-  // nsITreeView
-  get rowCount() {
-    return this._engineStore.engines.length;
-  },
-
-  getImageSrc(index, column) {
-    if (column.id == "engineName") {
-      if (this._engineStore.engines[index].iconURI)
-        return this._engineStore.engines[index].iconURI.spec;
-
-      if (window.devicePixelRatio > 1)
-        return "chrome://browser/skin/search-engine-placeholder@2x.png";
-      return "chrome://browser/skin/search-engine-placeholder.png";
-    }
-
-    return "";
-  },
-
-  getCellText(index, column) {
-    if (column.id == "engineName")
-      return this._engineStore.engines[index].name;
-    else if (column.id == "engineKeyword")
-      return this._engineStore.engines[index].alias;
-    return "";
-  },
-
-  setTree(tree) {
-    this.tree = tree;
-  },
-
-  canDrop(targetIndex, orientation, dataTransfer) {
-    var sourceIndex = this.getSourceIndexFromDrag(dataTransfer);
-    return (sourceIndex != -1 &&
-            sourceIndex != targetIndex &&
-            sourceIndex != targetIndex + orientation);
-  },
-
-  drop(dropIndex, orientation, dataTransfer) {
-    var sourceIndex = this.getSourceIndexFromDrag(dataTransfer);
-    var sourceEngine = this._engineStore.engines[sourceIndex];
-
-    const nsITreeView = Components.interfaces.nsITreeView;
-    if (dropIndex > sourceIndex) {
-      if (orientation == nsITreeView.DROP_BEFORE)
-        dropIndex--;
-    } else if (orientation == nsITreeView.DROP_AFTER) {
-      dropIndex++;
-    }
-
-    this._engineStore.moveEngine(sourceEngine, dropIndex);
-    gMainPane.showRestoreDefaults(true);
-    gMainPane.buildDefaultEngineDropDown();
-
-    // Redraw, and adjust selection
-    this.invalidate();
-    this.selection.select(dropIndex);
-  },
-
-  selection: null,
-  getRowProperties(index) { return ""; },
-  getCellProperties(index, column) { return ""; },
-  getColumnProperties(column) { return ""; },
-  isContainer(index) { return false; },
-  isContainerOpen(index) { return false; },
-  isContainerEmpty(index) { return false; },
-  isSeparator(index) { return false; },
-  isSorted(index) { return false; },
-  getParentIndex(index) { return -1; },
-  hasNextSibling(parentIndex, index) { return false; },
-  getLevel(index) { return 0; },
-  getProgressMode(index, column) { },
-  getCellValue(index, column) {
-    if (column.id == "engineShown")
-      return this._engineStore.engines[index].shown;
-    return undefined;
-  },
-  toggleOpenState(index) { },
-  cycleHeader(column) { },
-  selectionChanged() { },
-  cycleCell(row, column) { },
-  isEditable(index, column) { return column.id != "engineName"; },
-  isSelectable(index, column) { return false; },
-  setCellValue(index, column, value) {
-    if (column.id == "engineShown") {
-      this._engineStore.engines[index].shown = value == "true";
-      gEngineView.invalidate();
-      gMainPane.saveOneClickEnginesList();
-    }
-  },
-  setCellText(index, column, value) {
-    if (column.id == "engineKeyword") {
-      gMainPane.editKeyword(this._engineStore.engines[index], value)
-                 .then(valid => {
-        if (!valid)
-          document.getElementById("engineList").startEditing(index, column);
-      });
-    }
-  },
-  performAction(action) { },
-  performActionOnRow(action, index) { },
-  performActionOnCell(action, index, column) { }
-};
--- a/browser/components/preferences/in-content-new/main.xul
+++ b/browser/components/preferences/in-content-new/main.xul
@@ -2,21 +2,23 @@
 # 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/.
 
 <!-- General panel -->
 
 <script type="application/javascript"
         src="chrome://browser/content/preferences/in-content-new/main.js"/>
 
+#ifdef MOZ_UPDATER
+  <script type="application/javascript" src="chrome://browser/content/aboutDialog-appUpdater.js"/>
+#endif
+
 <script type="application/javascript"
         src="chrome://mozapps/content/preferences/fontbuilder.js"/>
 
-<stringbundle id="engineManagerBundle" src="chrome://browser/locale/engineManager.properties"/>
-
 <stringbundle id="bundlePreferences" src="chrome://browser/locale/preferences.properties"/>
 
 <preferences id="mainPreferences" hidden="true" data-category="paneGeneral">
 
 #ifdef E10S_TESTING_ONLY
     <preference id="browser.tabs.remote.autostart"
                 name="browser.tabs.remote.autostart"
                 type="bool"/>
@@ -55,29 +57,16 @@
     <preference id="pref.browser.homepage.disable_button.restore_default"
                 name="pref.browser.homepage.disable_button.restore_default"
                 type="bool"/>
 
     <preference id="browser.privatebrowsing.autostart"
                 name="browser.privatebrowsing.autostart"
                 type="bool"/>
 
-    <!-- Search Engine -->
-    <preference id="browser.search.suggest.enabled"
-                  name="browser.search.suggest.enabled"
-                  type="bool"/>
-
-    <preference id="browser.urlbar.suggest.searches"
-                name="browser.urlbar.suggest.searches"
-                type="bool"/>
-
-    <preference id="browser.search.hiddenOneOffs"
-                name="browser.search.hiddenOneOffs"
-                type="unichar"/>
-
     <!-- Downloads -->
     <preference id="browser.download.useDownloadDir"
                 name="browser.download.useDownloadDir"
                 type="bool"/>
 
     <preference id="browser.download.folderList"
                 name="browser.download.folderList"
                 type="int"/>
@@ -194,20 +183,97 @@
   <preference id="dom.ipc.processCount"
               name="dom.ipc.processCount"
               type="int"/>
 
   <preference id="layers.acceleration.disabled"
               name="layers.acceleration.disabled"
               type="bool"
               inverted="true"/>
+
+  <!-- Files and Applications -->
+  <preference id="browser.feeds.handler"
+              name="browser.feeds.handler"
+              type="string"/>
+  <preference id="browser.feeds.handler.default"
+              name="browser.feeds.handler.default"
+              type="string"/>
+  <preference id="browser.feeds.handlers.application"
+              name="browser.feeds.handlers.application"
+              type="file"/>
+  <preference id="browser.feeds.handlers.webservice"
+              name="browser.feeds.handlers.webservice"
+              type="string"/>
+
+  <preference id="browser.videoFeeds.handler"
+              name="browser.videoFeeds.handler"
+              type="string"/>
+  <preference id="browser.videoFeeds.handler.default"
+              name="browser.videoFeeds.handler.default"
+              type="string"/>
+  <preference id="browser.videoFeeds.handlers.application"
+              name="browser.videoFeeds.handlers.application"
+              type="file"/>
+  <preference id="browser.videoFeeds.handlers.webservice"
+              name="browser.videoFeeds.handlers.webservice"
+              type="string"/>
+
+  <preference id="browser.audioFeeds.handler"
+              name="browser.audioFeeds.handler"
+              type="string"/>
+  <preference id="browser.audioFeeds.handler.default"
+              name="browser.audioFeeds.handler.default"
+              type="string"/>
+  <preference id="browser.audioFeeds.handlers.application"
+              name="browser.audioFeeds.handlers.application"
+              type="file"/>
+  <preference id="browser.audioFeeds.handlers.webservice"
+              name="browser.audioFeeds.handlers.webservice"
+              type="string"/>
+
+  <preference id="pref.downloads.disable_button.edit_actions"
+              name="pref.downloads.disable_button.edit_actions"
+              type="bool"/>
+
+  <!-- DRM content -->
+  <preference id="media.eme.enabled"
+              name="media.eme.enabled"
+              type="bool"/>
+
+  <!-- Update -->
+  <preference id="browser.preferences.advanced.selectedTabIndex"
+              name="browser.preferences.advanced.selectedTabIndex"
+              type="int"/>
+
+#ifdef MOZ_UPDATER
+  <preference id="app.update.enabled"
+              name="app.update.enabled"
+              type="bool"/>
+  <preference id="app.update.auto"
+              name="app.update.auto"
+              type="bool"/>
+
+  <preference id="app.update.disable_button.showUpdateHistory"
+              name="app.update.disable_button.showUpdateHistory"
+              type="bool"/>
+
+#ifdef MOZ_MAINTENANCE_SERVICE
+  <preference id="app.update.service.enabled"
+              name="app.update.service.enabled"
+              type="bool"/>
+#endif
+#endif
+
+  <preference id="browser.search.update"
+              name="browser.search.update"
+              type="bool"/>
 </preferences>
 
-<hbox id="header-general"
-      class="header"
+<hbox id="generalCategory"
+      class="subcategory"
       hidden="true"
       data-category="paneGeneral">
   <label class="header-name" flex="1">&paneGeneral.title;</label>
 </hbox>
 
 <!-- Startup -->
 <groupbox id="startupGroup"
           data-category="paneGeneral"
@@ -237,17 +303,17 @@
   <vbox id="defaultBrowserBox">
     <checkbox id="alwaysCheckDefault" preference="browser.shell.checkDefaultBrowser"
               label="&alwaysCheckDefault2.label;" accesskey="&alwaysCheckDefault2.accesskey;"/>
     <deck id="setDefaultPane">
       <hbox align="center" class="indent">
         <label id="isNotDefaultLabel" flex="1">&isNotDefault.label;</label>
         <button id="setDefaultButton"
                 class="accessory-button"
-                label="&setAsMyDefaultBrowser2.label;" accesskey="&setAsMyDefaultBrowser2.accesskey;"
+                label="&setAsMyDefaultBrowser3.label;" accesskey="&setAsMyDefaultBrowser3.accesskey;"
                 preference="pref.general.disable_button.default_browser"/>
       </hbox>
       <hbox align="center" class="indent">
         <label id="isDefaultLabel" flex="1">&isDefault.label;</label>
       </hbox>
     </deck>
     <separator class="thin"/>
   </vbox>
@@ -314,74 +380,18 @@
                 label="&restoreDefault.label;"
                 accesskey="&restoreDefault.accesskey;"
                 preference="pref.browser.homepage.disable_button.restore_default"/>
       </html:td>
     </html:tr>
   </html:table>
 </groupbox>
 
-<!-- Default Search Engine -->
-<groupbox id="defaultEngineGroup" data-category="paneGeneral" data-subcategory="search">
   <caption><label>&defaultSearchEngine.label;</label></caption>
-  <label>&chooseYourDefaultSearchEngine.label;</label>
-  <box align="start">
-    <menulist id="defaultEngine">
-      <menupopup/>
-    </menulist>
-  </box>
-  <checkbox id="suggestionsInSearchFieldsCheckbox"
-            label="&provideSearchSuggestions.label;"
-            accesskey="&provideSearchSuggestions.accesskey;"
-            preference="browser.search.suggest.enabled"/>
-  <vbox class="indent">
-    <checkbox id="urlBarSuggestion" label="&showURLBarSuggestions.label;"
-              accesskey="&showURLBarSuggestions.accesskey;"
-              preference="browser.urlbar.suggest.searches"/>
-    <hbox id="urlBarSuggestionPermanentPBLabel"
-          align="center" class="indent">
-      <label flex="1">&urlBarSuggestionsPermanentPB.label;</label>
-    </hbox>
-  </vbox>
-</groupbox>
-
-<groupbox id="oneClickSearchProvidersGroup" data-category="paneGeneral" data-subcategory="search">
   <caption><label>&oneClickSearchEngines.label;</label></caption>
-  <label>&chooseWhichOneToDisplay.label;</label>
-
-  <tree id="engineList" flex="1" rows="8" hidecolumnpicker="true" editable="true"
-        seltype="single" allowunderflowscroll="true">
-    <treechildren id="engineChildren" flex="1"/>
-    <treecols>
-      <treecol id="engineShown" type="checkbox" editable="true" sortable="false"/>
-      <treecol id="engineName" flex="4" label="&engineNameColumn.label;" sortable="false"/>
-      <treecol id="engineKeyword" flex="1" label="&engineKeywordColumn.label;" editable="true"
-                sortable="false"/>
-    </treecols>
-  </tree>
-
-  <hbox>
-    <button id="restoreDefaultSearchEngines"
-            label="&restoreDefaultSearchEngines.label;"
-            accesskey="&restoreDefaultSearchEngines.accesskey;"/>
-    <spacer flex="1"/>
-    <button id="removeEngineButton"
-            class="searchEngineAction accessory-button"
-            label="&removeEngine.label;"
-            accesskey="&removeEngine.accesskey;"
-            disabled="true"/>
-  </hbox>
-
-  <separator class="thin"/>
-
-  <hbox id="addEnginesBox" pack="start">
-    <label id="addEngines" class="text-link">&addMoreSearchEngines2.label;</label>
-  </hbox>
-</groupbox>
-
 <!-- Tab preferences -->
 <groupbox data-category="paneGeneral"
           hidden="true">
     <caption><label>&tabsGroup.label;</label></caption>
 
     <checkbox id="ctrlTabRecentlyUsedOrder" label="&ctrlTabRecentlyUsedOrder.label;"
               accesskey="&ctrlTabRecentlyUsedOrder.accesskey;"
               preference="browser.ctrlTab.previews"/>
@@ -404,90 +414,43 @@
               accesskey="&switchLinksToNewTabs.accesskey;"
               preference="browser.tabs.loadInBackground"/>
 
 #ifdef XP_WIN
     <checkbox id="showTabsInTaskbar" label="&showTabsInTaskbar.label;"
               accesskey="&showTabsInTaskbar.accesskey;"
               preference="browser.taskbar.previews.enable"/>
 #endif
-</groupbox>
 
-<!-- Accessibility -->
-<groupbox data-category="paneGeneral" id="accessibilityGroup">
-  <caption><label>&accessibility.label;</label></caption>
-
-#ifdef XP_WIN
-  <checkbox id="useOnScreenKeyboard"
-            hidden="true"
-            label="&useOnScreenKeyboard.label;"
-            accesskey="&useOnScreenKeyboard.accesskey;"
-            preference="ui.osk.enabled"/>
-#endif
-  <checkbox id="useCursorNavigation"
-            label="&useCursorNavigation.label;"
-            accesskey="&useCursorNavigation.accesskey;"
-            preference="accessibility.browsewithcaret"/>
-  <checkbox id="searchStartTyping"
-            label="&searchOnStartTyping.label;"
-            accesskey="&searchOnStartTyping.accesskey;"
-            preference="accessibility.typeaheadfind"/>
-  <checkbox id="blockAutoRefresh"
-            label="&blockAutoReload.label;"
-            accesskey="&blockAutoReload.accesskey;"
-            preference="accessibility.blockautorefresh"/>
+    <hbox id="browserContainersbox" hidden="true" align="center">
+      <checkbox id="browserContainersCheckbox"
+                label="&browserContainersEnabled.label;"
+                accesskey="&browserContainersEnabled.accesskey;"
+                preference="privacy.userContext.enabled"
+                onsyncfrompreference="return gPrivacyPane.readBrowserContainersCheckbox();"/>
+      <label id="browserContainersLearnMore" class="learnMore text-link">
+        &browserContainersLearnMore.label;
+      </label>
+      <spacer flex="1"/>
+      <button id="browserContainersSettings"
+              class="accessory-button"
+              label="&browserContainersSettings.label;"
+              accesskey="&browserContainersSettings.accesskey;"
+              searchkeywords="&addButton.label;
+                              &preferencesButton.label;
+                              &removeButton.label;"/>
+    </hbox>
 </groupbox>
 
-<!-- Languages -->
-<groupbox id="languagesGroup" data-category="paneGeneral" hidden="true">
-  <caption><label>&languages.label;</label></caption>
-
-  <hbox id="languagesBox" align="center">
-    <description flex="1" control="chooseLanguage">&chooseLanguage.label;</description>
-    <button id="chooseLanguage"
-            class="accessory-button"
-            label="&chooseButton.label;"
-            accesskey="&chooseButton.accesskey;"
-            searchkeywords="&languages.customize.Header;
-                            &languages.customize.description;
-                            &languages.customize.moveUp.label;
-                            &languages.customize.moveDown.label;
-                            &languages.customize.deleteButton.label;
-                            &languages.customize.selectLanguage.label;
-                            &languages.customize.addButton.label;"/>
-  </hbox>
-
-  <hbox id="translationBox" hidden="true">
-    <hbox align="center" flex="1">
-      <checkbox id="translate" preference="browser.translation.detectLanguage"
-                label="&translateWebPages.label;." accesskey="&translateWebPages.accesskey;"
-                onsyncfrompreference="return gMainPane.updateButtons('translateButton',
-                                              'browser.translation.detectLanguage');"/>
-      <hbox id="bingAttribution" hidden="true">
-        <label>&translation.options.attribution.beforeLogo;</label>
-        <separator orient="vertical" class="thin"/>
-        <image id="translationAttributionImage" aria-label="Microsoft Translator"
-               src="chrome://browser/content/microsoft-translator-attribution.png"/>
-        <separator orient="vertical" class="thin"/>
-        <label>&translation.options.attribution.afterLogo;</label>
-      </hbox>
-    </hbox>
-    <button id="translateButton"
-            class="accessory-button"
-            label="&translateExceptions.label;"
-            accesskey="&translateExceptions.accesskey;"/>
-  </hbox>
-  <checkbox id="checkSpelling"
-          label="&checkUserSpelling.label;"
-          accesskey="&checkUserSpelling.accesskey;"
-          onsyncfrompreference="return gMainPane.readCheckSpelling();"
-          onsynctopreference="return gMainPane.writeCheckSpelling();"
-          preference="layout.spellcheckDefault"/>
-</groupbox>
-
+<hbox id="languageAndAppearanceCategory"
+      class="subcategory"
+      hidden="true"
+      data-category="paneGeneral">
+  <label class="header-name" flex="1">&languageAndAppearance.label;</label>
+</hbox>
 
 <!-- Fonts and Colors -->
 <groupbox id="fontsGroup" data-category="paneGeneral" hidden="true">
   <caption><label>&fontsAndColors.label;</label></caption>
 
   <vbox>
     <hbox id="fontSettings">
       <hbox align="center">
@@ -605,34 +568,320 @@
                               &useSystemColors.label;
                               &underlineLinks.label;
                               &linkColor.label;
                               &visitedLinkColor.label;"/>
     </hbox>
   </vbox>
 </groupbox>
 
-<!-- Browsing -->
-<groupbox id="browsingGroup" data-category="paneGeneral">
-  <caption><label>&browsing.label;</label></caption>
+<!-- Languages -->
+<groupbox id="languagesGroup" data-category="paneGeneral" hidden="true">
+  <caption><label>&language2.label;</label></caption>
+
+  <hbox id="languagesBox" align="center">
+    <description flex="1" control="chooseLanguage">&chooseLanguage.label;</description>
+    <button id="chooseLanguage"
+            class="accessory-button"
+            label="&chooseButton.label;"
+            accesskey="&chooseButton.accesskey;"
+            searchkeywords="&languages.customize.Header;
+                            &languages.customize.description;
+                            &languages.customize.moveUp.label;
+                            &languages.customize.moveDown.label;
+                            &languages.customize.deleteButton.label;
+                            &languages.customize.selectLanguage.label;
+                            &languages.customize.addButton.label;"/>
+  </hbox>
+
+  <hbox id="translationBox" hidden="true">
+    <hbox align="center" flex="1">
+      <checkbox id="translate" preference="browser.translation.detectLanguage"
+                label="&translateWebPages.label;." accesskey="&translateWebPages.accesskey;"
+                onsyncfrompreference="return gMainPane.updateButtons('translateButton',
+                                              'browser.translation.detectLanguage');"/>
+      <hbox id="bingAttribution" hidden="true">
+        <label>&translation.options.attribution.beforeLogo;</label>
+        <separator orient="vertical" class="thin"/>
+        <image id="translationAttributionImage" aria-label="Microsoft Translator"
+               src="chrome://browser/content/microsoft-translator-attribution.png"/>
+        <separator orient="vertical" class="thin"/>
+        <label>&translation.options.attribution.afterLogo;</label>
+      </hbox>
+    </hbox>
+    <button id="translateButton"
+            class="accessory-button"
+            label="&translateExceptions.label;"
+            accesskey="&translateExceptions.accesskey;"/>
+  </hbox>
+  <checkbox id="checkSpelling"
+          label="&checkUserSpelling.label;"
+          accesskey="&checkUserSpelling.accesskey;"
+          onsyncfrompreference="return gMainPane.readCheckSpelling();"
+          onsynctopreference="return gMainPane.writeCheckSpelling();"
+          preference="layout.spellcheckDefault"/>
+</groupbox>
+
+<!-- Files and Applications -->
+<keyset data-category="paneGeneral">
+  <!-- Ctrl+f/k focus the search box in the Applications pane.
+       These <key>s have oncommand attributes because of bug 371900. -->
+  <key key="&focusSearch1.key;" modifiers="accel" id="focusSearch1" oncommand=";"/>
+  <key key="&focusSearch2.key;" modifiers="accel" id="focusSearch2" oncommand=";"/>
+</keyset>
+
+<hbox id="filesAndApplicationsCategory"
+      class="subcategory"
+      hidden="true"
+      data-category="paneGeneral">
+  <label class="header-name" flex="1">&filesAndApplications.label;</label>
+</hbox>
+
+<!--Downloads-->
+<groupbox id="downloadsGroup" data-category="paneGeneral" hidden="true">
+  <caption><label>&downloads.label;</label></caption>
+
+  <radiogroup id="saveWhere"
+              preference="browser.download.useDownloadDir"
+              onsyncfrompreference="return gMainPane.readUseDownloadDir();">
+    <hbox id="saveToRow">
+      <radio id="saveTo"
+            value="true"
+            label="&saveTo.label;"
+            accesskey="&saveTo.accesskey;"
+            aria-labelledby="saveTo downloadFolder"/>
+      <filefield id="downloadFolder"
+                flex="1"
+                preference="browser.download.folderList"
+                preference-editable="true"
+                aria-labelledby="saveTo"
+                onsyncfrompreference="return gMainPane.displayDownloadDirPref();"/>
+      <button id="chooseFolder"
+#ifdef XP_MACOSX
+              accesskey="&chooseFolderMac.accesskey;"
+              label="&chooseFolderMac.label;"
+#else
+              accesskey="&chooseFolderWin.accesskey;"
+              label="&chooseFolderWin.label;"
+#endif
+      />
+    </hbox>
+    <radio id="alwaysAsk"
+          value="false"
+          label="&alwaysAskWhere.label;"
+          accesskey="&alwaysAskWhere.accesskey;"/>
+  </radiogroup>
+</groupbox>
+
+<groupbox id="applicationsGroup" data-category="paneGeneral" hidden="true">
+  <caption><label>&applications.label;</label></caption>
+  <description>&applications.description;</description>
+  <textbox id="filter" flex="1"
+           type="search"
+           placeholder="&filter2.emptytext;"
+           aria-controls="handlersView"/>
+
+  <richlistbox id="handlersView" orient="vertical" persist="lastSelectedType"
+               preference="pref.downloads.disable_button.edit_actions"
+               flex="1">
+    <listheader equalsize="always">
+        <treecol id="typeColumn" label="&typeColumn.label;" value="type"
+                 accesskey="&typeColumn.accesskey;" persist="sortDirection"
+                 flex="1" sortDirection="ascending"/>
+        <treecol id="actionColumn" label="&actionColumn2.label;" value="action"
+                 accesskey="&actionColumn2.accesskey;" persist="sortDirection"
+                 flex="1"/>
+    </listheader>
+  </richlistbox>
+</groupbox>
+
+
+<!-- DRM Content -->
+<groupbox id="drmGroup" data-category="paneGeneral" hidden="true">
+  <caption><label>&drmContent2.label;</label></caption>
+  <grid id="contentGrid2">
+    <columns>
+      <column flex="1"/>
+      <column/>
+    </columns>
+    <rows id="contentRows-2">
+      <row id="playDRMContentRow">
+        <hbox align="center">
+          <checkbox id="playDRMContent" preference="media.eme.enabled"
+                    label="&playDRMContent2.label;" accesskey="&playDRMContent2.accesskey;"/>
+          <label id="playDRMContentLink" class="learnMore text-link">
+            &playDRMContent.learnMore.label;
+          </label>
+        </hbox>
+      </row>
+    </rows>
+  </grid>
+</groupbox>
+
+#ifdef HAVE_SHELL_SERVICE
+  <stringbundle id="bundleShell" src="chrome://browser/locale/shellservice.properties"/>
+  <stringbundle id="bundleBrand" src="chrome://branding/locale/brand.properties"/>
+#endif
 
-  <checkbox id="useAutoScroll"
-            label="&useAutoScroll.label;"
-            accesskey="&useAutoScroll.accesskey;"
-            preference="general.autoScroll"/>
-  <checkbox id="useSmoothScrolling"
-            label="&useSmoothScrolling.label;"
-            accesskey="&useSmoothScrolling.accesskey;"
-            preference="general.smoothScroll"/>
+<hbox id="updatesCategory"
+      class="subcategory"
+      hidden="true"
+      data-category="paneGeneral">
+  <label class="header-name" flex="1">&updateApplication.label;</label>
+</hbox>
+
+<!-- Update -->
+<groupbox id="updateApp" data-category="paneGeneral" hidden="true">
+  <hbox align="start">
+    <vbox flex="1">
+      <description>
+        &updateApplication.version.pre;<label id="version"/>&updateApplication.version.post;
+        <label id="releasenotes" class="learnMore text-link" hidden="true">&releaseNotes.link;</label>
+      </description>
+      <description id="distribution" class="text-blurb" hidden="true"/>
+      <description id="distributionId" class="text-blurb" hidden="true"/>
+    </vbox>
+#ifdef MOZ_UPDATER
+    <spacer flex="1"/>
+    <vbox>
+      <button id="showUpdateHistory"
+              class="accessory-button"
+              label="&updateHistory2.label;"
+              accesskey="&updateHistory2.accesskey;"
+              preference="app.update.disable_button.showUpdateHistory"
+              searchkeywords="&history.title; &history.intro;"/>
+    </vbox>
+#endif
+  </hbox>
+#ifdef MOZ_UPDATER
+  <vbox id="updateBox">
+    <deck id="updateDeck" orient="vertical">
+      <hbox id="checkForUpdates" align="center">
+        <spacer flex="1"/>
+        <button id="checkForUpdatesButton"
+                label="&update.checkForUpdatesButton.label;"
+                accesskey="&update.checkForUpdatesButton.accesskey;"
+                oncommand="gAppUpdater.checkForUpdates();"/>
+      </hbox>
+      <hbox id="downloadAndInstall" align="center">
+        <spacer flex="1"/>
+        <button id="downloadAndInstallButton"
+                oncommand="gAppUpdater.startDownload();"/>
+                <!-- label and accesskey will be filled by JS -->
+      </hbox>
+      <hbox id="apply" align="center">
+        <spacer flex="1"/>
+        <button id="updateButton"
+                label="&update.updateButton.label3;"
+                accesskey="&update.updateButton.accesskey;"
+                oncommand="gAppUpdater.buttonRestartAfterDownload();"/>
+      </hbox>
+      <hbox id="checkingForUpdates" align="center">
+        <image class="update-throbber"/><label>&update.checkingForUpdates;</label>
+        <spacer flex="1"/>
+        <button label="&update.checkForUpdatesButton.label;"
+                accesskey="&update.checkForUpdatesButton.accesskey;"
+                disabled="true"/>
+      </hbox>
+      <hbox id="downloading" align="center">
+        <image class="update-throbber"/><label>&update.downloading.start;</label><label id="downloadStatus"/><label>&update.downloading.end;</label>
+      </hbox>
+      <hbox id="applying" align="center">
+        <image class="update-throbber"/><label>&update.applying;</label>
+      </hbox>
+      <hbox id="downloadFailed" align="center">
+        <label>&update.failed.start;</label><label id="failedLink" class="text-link">&update.failed.linkText;</label><label>&update.failed.end;</label>
+        <spacer flex="1"/>
+        <button label="&update.checkForUpdatesButton.label;"
+                accesskey="&update.checkForUpdatesButton.accesskey;"
+                oncommand="gAppUpdater.checkForUpdates();"/>
+      </hbox>
+      <hbox id="adminDisabled" align="center">
+        <label>&update.adminDisabled;</label>
+        <spacer flex="1"/>
+        <button label="&update.checkForUpdatesButton.label;"
+                accesskey="&update.checkForUpdatesButton.accesskey;"
+                disabled="true"/>
+      </hbox>
+      <hbox id="noUpdatesFound" align="center">
+        <label>&update.noUpdatesFound;</label>
+        <spacer flex="1"/>
+        <button label="&update.checkForUpdatesButton.label;"
+                accesskey="&update.checkForUpdatesButton.accesskey;"
+                oncommand="gAppUpdater.checkForUpdates();"/>
+      </hbox>
+      <hbox id="otherInstanceHandlingUpdates" align="center">
+        <label>&update.otherInstanceHandlingUpdates;</label>
+        <spacer flex="1"/>
+        <button label="&update.checkForUpdatesButton.label;"
+                accesskey="&update.checkForUpdatesButton.accesskey;"
+                disabled="true"/>
+      </hbox>
+      <hbox id="manualUpdate" align="center">
+        <label>&update.manual.start;</label><label id="manualLink" class="text-link"/><label>&update.manual.end;</label>
+        <spacer flex="1"/>
+        <button label="&update.checkForUpdatesButton.label;"
+                accesskey="&update.checkForUpdatesButton.accesskey;"
+                disabled="true"/>
+      </hbox>
+      <hbox id="unsupportedSystem" align="center">
+        <label>&update.unsupported.start;</label><label id="unsupportedLink" class="text-link">&update.unsupported.linkText;</label><label>&update.unsupported.end;</label>
+        <spacer flex="1"/>
+        <button label="&update.checkForUpdatesButton.label;"
+                accesskey="&update.checkForUpdatesButton.accesskey;"
+                disabled="true"/>
+      </hbox>
+      <hbox id="restarting" align="center">
+        <image class="update-throbber"/><label>&update.restarting;</label>
+        <spacer flex="1"/>
+        <button label="&update.updateButton.label3;"
+                accesskey="&update.updateButton.accesskey;"
+                disabled="true"/>
+      </hbox>
+    </deck>
+  </vbox>
+#endif
+
+  <separator/>
+#ifdef MOZ_UPDATER
+  <description>&updateApplication.description;</description>
+  <radiogroup id="updateRadioGroup">
+    <radio id="autoDesktop"
+           value="auto"
+           label="&updateAuto2.label;"
+           accesskey="&updateAuto2.accesskey;"/>
+    <radio value="checkOnly"
+          label="&updateCheckChoose2.label;"
+          accesskey="&updateCheckChoose2.accesskey;"/>
+    <radio value="manual"
+          label="&updateManual2.label;"
+          accesskey="&updateManual2.accesskey;"/>
+  </radiogroup>
+#ifdef MOZ_MAINTENANCE_SERVICE
+  <checkbox id="useService"
+            label="&useService.label;"
+            accesskey="&useService.accesskey;"
+            preference="app.update.service.enabled"/>
+#endif
+#endif
+  <checkbox id="enableSearchUpdate"
+            label="&enableSearchUpdate2.label;"
+            accesskey="&enableSearchUpdate2.accesskey;"
+            preference="browser.search.update"/>
 </groupbox>
 
+<hbox id="performanceCategory"
+      class="subcategory"
+      hidden="true"
+      data-category="paneGeneral">
+  <label class="header-name" flex="1">&performance.label;</label>
+</hbox>
+
 <!-- Performance -->
 <groupbox id="performanceGroup" data-category="paneGeneral" hidden="true">
-  <caption><label>&performance.label;</label></caption>
-
   <hbox align="center">
     <checkbox id="useRecommendedPerformanceSettings"
               label="&useRecommendedPerformanceSettings2.label;"
               accesskey="&useRecommendedPerformanceSettings2.accesskey;"
               preference="browser.preferences.defaultPerformanceSettings.enabled"/>
     <label id="performanceSettingsLearnMore" class="learnMore text-link">&performanceSettingsLearnMore.label;</label>
   </hbox>
   <description class="indent">&useRecommendedPerformanceSettings2.description;</description>
@@ -655,8 +904,80 @@
           <menuitem label="7" value="7"/>
         </menupopup>
       </menulist>
     </hbox>
     <description id="contentProcessCountEnabledDescription">&limitContentProcessOption.description;</description>
     <description id="contentProcessCountDisabledDescription">&limitContentProcessOption.disabledDescription;<label class="text-link" href="https://wiki.mozilla.org/Electrolysis">&limitContentProcessOption.disabledDescriptionLink;</label></description>
   </vbox>
 </groupbox>
+
+<hbox id="browsingCategory"
+      class="subcategory"
+      hidden="true"
+      data-category="paneGeneral">
+  <label class="header-name" flex="1">&browsing.label;</label>
+</hbox>
+
+<!-- Browsing -->
+<groupbox id="browsingGroup" data-category="paneGeneral" hidden="true">
+  <checkbox id="useAutoScroll"
+            label="&useAutoScroll.label;"
+            accesskey="&useAutoScroll.accesskey;"
+            preference="general.autoScroll"/>
+  <checkbox id="useSmoothScrolling"
+            label="&useSmoothScrolling.label;"
+            accesskey="&useSmoothScrolling.accesskey;"
+            preference="general.smoothScroll"/>
+
+#ifdef XP_WIN
+  <checkbox id="useOnScreenKeyboard"
+            hidden="true"
+            label="&useOnScreenKeyboard.label;"
+            accesskey="&useOnScreenKeyboard.accesskey;"
+            preference="ui.osk.enabled"/>
+#endif
+  <checkbox id="useCursorNavigation"
+            label="&useCursorNavigation.label;"
+            accesskey="&useCursorNavigation.accesskey;"
+            preference="accessibility.browsewithcaret"/>
+  <checkbox id="searchStartTyping"
+            label="&searchOnStartTyping.label;"
+            accesskey="&searchOnStartTyping.accesskey;"
+            preference="accessibility.typeaheadfind"/>
+</groupbox>
+
+<hbox id="networkProxyCategory"
+      class="subcategory"
+      hidden="true"
+      data-category="paneGeneral">
+  <label class="header-name" flex="1">&networkProxy.label;</label>
+</hbox>
+
+<!-- Network Proxy-->
+<groupbox id="connectionGroup" data-category="paneGeneral" hidden="true">
+  <hbox align="center">
+    <description flex="1" control="connectionSettings">&connectionDesc.label;</description>
+    <button id="connectionSettings"
+            class="accessory-button"
+            icon="network"
+            label="&connectionSettings.label;"
+            accesskey="&connectionSettings.accesskey;"
+            searchkeywords="&connectionsDialog.title;
+                            &noProxyTypeRadio.label;
+                            &WPADTypeRadio.label;
+                            &systemTypeRadio.label;
+                            &manualTypeRadio.label;
+                            &http.label;
+                            &ssl.label;
+                            &ftp.label;
+                            &socks.label;
+                            &socks4.label;
+                            &socks5.label;
+                            &noproxy.label;
+                            &noproxyExplain.label;
+                            &shareproxy.label;
+                            &autoTypeRadio.label;
+                            &reload.label;
+                            &autologinproxy.label;
+                            &socksRemoteDNS.label2;"/>
+  </hbox>
+</groupbox>
--- a/browser/components/preferences/in-content-new/preferences.js
+++ b/browser/components/preferences/in-content-new/preferences.js
@@ -1,19 +1,18 @@
 /* - This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this file,
    - You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 // Import globals from the files imported by the .xul files.
 /* import-globals-from subdialogs.js */
-/* import-globals-from advanced.js */
 /* import-globals-from main.js */
+/* import-globals-from search.js */
 /* import-globals-from containers.js */
 /* import-globals-from privacy.js */
-/* import-globals-from applications.js */
 /* import-globals-from sync.js */
 /* import-globals-from findInPage.js */
 /* import-globals-from ../../../base/content/utilityOverlay.js */
 
 "use strict";
 
 var Cc = Components.classes;
 var Ci = Components.interfaces;
@@ -50,20 +49,19 @@ function register_module(categoryName, c
 
 document.addEventListener("DOMContentLoaded", init_all, {once: true});
 
 function init_all() {
   document.documentElement.instantApply = true;
 
   gSubDialog.init();
   register_module("paneGeneral", gMainPane);
+  register_module("paneSearch", gSearchPane);
   register_module("panePrivacy", gPrivacyPane);
   register_module("paneContainers", gContainersPane);
-  register_module("paneAdvanced", gAdvancedPane);
-  register_module("paneApplications", gApplicationsPane);
   register_module("paneSync", gSyncPane);
   register_module("paneSearchResults", gSearchResultsPane);
   gSearchResultsPane.init();
 
   let categories = document.getElementById("categories");
   categories.addEventListener("select", event => gotoPref(event.target.value));
 
   document.documentElement.addEventListener("keydown", function(event) {
@@ -126,21 +124,20 @@ function init_dynamic_padding() {
   mediaStyle.setAttribute("type", "text/css");
   mediaStyle.appendChild(document.createCDATASection(mediaRule));
   document.documentElement.appendChild(mediaStyle);
 }
 
 function telemetryBucketForCategory(category) {
   category = category.toLowerCase();
   switch (category) {
-    case "applications":
-    case "advanced":
     case "containers":
     case "general":
     case "privacy":
+    case "search":
     case "sync":
     case "searchresults":
       return category;
     default:
       return "unknown";
   }
 }
 
@@ -339,8 +336,19 @@ function confirmRestartPrompt(aRestartTo
     Services.obs.notifyObservers(cancelQuit, "quit-application-requested",
                                   "restart");
     if (cancelQuit.data) {
       buttonIndex = CONFIRM_RESTART_PROMPT_CANCEL;
     }
   }
   return buttonIndex;
 }
+
+// This function is used to append search keywords found
+// in the related subdialog to the button that will activate the subdialog.
+function appendSearchKeywords(aId, keywords) {
+  let element = document.getElementById(aId);
+  let searchKeywords = element.getAttribute("searchkeywords");
+  if (searchKeywords) {
+    keywords.push(searchKeywords);
+  }
+  element.setAttribute("searchkeywords", keywords.join(" "));
+}
--- a/browser/components/preferences/in-content-new/preferences.xul
+++ b/browser/components/preferences/in-content-new/preferences.xul
@@ -139,84 +139,72 @@
                     value="paneGeneral"
                     helpTopic="prefs-main"
                     tooltiptext="&paneGeneral.title;"
                     align="center">
         <image class="category-icon"/>
         <label class="category-name" flex="1">&paneGeneral.title;</label>
       </richlistitem>
 
-      <richlistitem id="category-application"
+      <richlistitem id="category-search"
                     class="category"
-                    value="paneApplications"
-                    helpTopic="prefs-applications"
-                    tooltiptext="&paneFilesApplications.title;"
+                    value="paneSearch"
+                    helpTopic="prefs-search"
+                    tooltiptext="&paneSearch.title;"
                     align="center">
         <image class="category-icon"/>
-        <label class="category-name" flex="1">&paneFilesApplications.title;</label>
+        <label class="category-name" flex="1">&paneSearch.title;</label>
       </richlistitem>
 
       <richlistitem id="category-containers"
                     class="category"
                     value="paneContainers"
                     helpTopic="prefs-containers"
                     hidden="true"/>
 
-      <richlistitem id="category-sync"
-                    class="category"
-                    value="paneSync"
-                    helpTopic="prefs-weave"
-                    tooltiptext="&paneSync1.title;"
-                    align="center">
-        <image class="category-icon"/>
-        <label class="category-name" flex="1">&paneSync1.title;</label>
-      </richlistitem>
-
       <richlistitem id="category-privacy"
                     class="category"
                     value="panePrivacy"
                     helpTopic="prefs-privacy"
                     tooltiptext="&panePrivacySecurity.title;"
                     align="center">
         <image class="category-icon"/>
         <label class="category-name" flex="1">&panePrivacySecurity.title;</label>
       </richlistitem>
 
-      <richlistitem id="category-advanced"
+      <richlistitem id="category-sync"
                     class="category"
-                    value="paneAdvanced"
-                    helpTopic="prefs-advanced-general"
-                    tooltiptext="&paneUpdates.title;"
+                    value="paneSync"
+                    helpTopic="prefs-weave"
+                    tooltiptext="&paneSync1.title;"
                     align="center">
         <image class="category-icon"/>
-        <label class="category-name" flex="1">&paneUpdates.title;</label>
+        <label class="category-name" flex="1">&paneSync1.title;</label>
       </richlistitem>
     </richlistbox>
 
     <keyset>
       <!-- Disable the findbar because it doesn't work properly.
            Remove this keyset once bug 1094240 ("disablefastfind" attribute
            broken in e10s mode) is fixed. -->
       <key key="&focusSearch1.key;" modifiers="accel" id="focusSearch1" oncommand=";"/>
     </keyset>
 
     <html:a class="help-button" target="_blank" aria-label="&helpButton2.label;">&helpButton2.label;</html:a>
 
     <vbox class="main-content" flex="1">
       <hbox pack="end">
-        <textbox type="search" id="searchInput" placeholder="&searchInput.label;" hidden="true"
-                 clickSelectsAll="true"/>
+        <textbox type="search" id="searchInput" hidden="true" clickSelectsAll="true"/>
       </hbox>
       <prefpane id="mainPrefPane">
 #include searchResults.xul
 #include main.xul
+#include search.xul
 #include privacy.xul
 #include containers.xul
-#include advanced.xul
-#include applications.xul
 #include sync.xul
       </prefpane>
     </vbox>
   </hbox>
 
   <stack id="dialogStack" hidden="true"/>
   <vbox id="dialogTemplate" class="dialogOverlay" align="center" pack="center" topmost="true" hidden="true">
     <groupbox class="dialogBox"
--- a/browser/components/preferences/in-content-new/privacy.js
+++ b/browser/components/preferences/in-content-new/privacy.js
@@ -80,98 +80,33 @@ var gPrivacyPane = {
    * Initialize autocomplete to ensure prefs are in sync.
    */
   _initAutocomplete() {
     Components.classes["@mozilla.org/autocomplete/search;1?name=unifiedcomplete"]
               .getService(Components.interfaces.mozIPlacesAutoComplete);
   },
 
   /**
-   * Show the Containers UI depending on the privacy.userContext.ui.enabled pref.
-   */
-  _initBrowserContainers() {
-    if (!Services.prefs.getBoolPref("privacy.userContext.ui.enabled")) {
-      // The browserContainersGroup element has its own internal padding that
-      // is visible even if the browserContainersbox is visible, so hide the whole
-      // groupbox if the feature is disabled to prevent a gap in the preferences.
-      document.getElementById("browserContainersGroup").setAttribute("data-hidden-from-search", "true");
-      return;
-    }
-
-    let link = document.getElementById("browserContainersLearnMore");
-    link.href = Services.urlFormatter.formatURLPref("app.support.baseURL") + "containers";
-
-    document.getElementById("browserContainersbox").hidden = false;
-
-    document.getElementById("browserContainersCheckbox").checked =
-      Services.prefs.getBoolPref("privacy.userContext.enabled");
-  },
-
-  _checkBrowserContainers(event) {
-    let checkbox = document.getElementById("browserContainersCheckbox");
-    if (checkbox.checked) {
-      Services.prefs.setBoolPref("privacy.userContext.enabled", true);
-      return;
-    }
-
-    let count = ContextualIdentityService.countContainerTabs();
-    if (count == 0) {
-      Services.prefs.setBoolPref("privacy.userContext.enabled", false);
-      return;
-    }
-
-    let bundlePreferences = document.getElementById("bundlePreferences");
-
-    let title = bundlePreferences.getString("disableContainersAlertTitle");
-    let message = PluralForm.get(count, bundlePreferences.getString("disableContainersMsg"))
-                            .replace("#S", count)
-    let okButton = PluralForm.get(count, bundlePreferences.getString("disableContainersOkButton"))
-                             .replace("#S", count)
-    let cancelButton = bundlePreferences.getString("disableContainersButton2");
-
-    let buttonFlags = (Ci.nsIPrompt.BUTTON_TITLE_IS_STRING * Ci.nsIPrompt.BUTTON_POS_0) +
-                      (Ci.nsIPrompt.BUTTON_TITLE_IS_STRING * Ci.nsIPrompt.BUTTON_POS_1);
-
-    let rv = Services.prompt.confirmEx(window, title, message, buttonFlags,
-                                       okButton, cancelButton, null, null, {});
-    if (rv == 0) {
-      ContextualIdentityService.closeContainerTabs();
-      Services.prefs.setBoolPref("privacy.userContext.enabled", false);
-      return;
-    }
-
-    checkbox.checked = true;
-  },
-
-  /**
    * Sets up the UI for the number of days of history to keep, and updates the
    * label of the "Clear Now..." button.
    */
   init() {
     function setEventListener(aId, aEventType, aCallback) {
       document.getElementById(aId)
               .addEventListener(aEventType, aCallback.bind(gPrivacyPane));
     }
 
-    function appendSearchKeywords(aId, keywords) {
-      let element = document.getElementById(aId);
-      let searchKeywords = element.getAttribute("searchkeywords");
-      searchKeywords && keywords.push(searchKeywords);
-      element.setAttribute("searchkeywords", keywords.join(" "));
-    }
-
     this._updateSanitizeSettingsButton();
     this.initializeHistoryMode();
     this.updateHistoryModePane();
     this.updatePrivacyMicroControls();
     this.initAutoStartPrivateBrowsingReverter();
     this._initTrackingProtection();
     this._initTrackingProtectionPBM();
     this._initAutocomplete();
-    this._initBrowserContainers();
 
     setEventListener("privacy.sanitize.sanitizeOnShutdown", "change",
                      gPrivacyPane._updateSanitizeSettingsButton);
     setEventListener("browser.privatebrowsing.autostart", "change",
                      gPrivacyPane.updatePrivacyMicroControls);
     setEventListener("historyMode", "command", function() {
       gPrivacyPane.updateHistoryModePane();
       gPrivacyPane.updateHistoryModePrefs();
@@ -199,36 +134,30 @@ var gPrivacyPane = {
     setEventListener("clearDataSettings", "command",
                      gPrivacyPane.showClearPrivateDataSettings);
     setEventListener("trackingProtectionRadioGroup", "command",
                      gPrivacyPane.trackingProtectionWritePrefs);
     setEventListener("trackingProtectionExceptions", "command",
                      gPrivacyPane.showTrackingProtectionExceptions);
     setEventListener("changeBlockList", "command",
                      gPrivacyPane.showBlockLists);
-    setEventListener("browserContainersCheckbox", "command",
-                     gPrivacyPane._checkBrowserContainers);
-    setEventListener("browserContainersSettings", "command",
-                     gPrivacyPane.showContainerSettings);
     setEventListener("passwordExceptions", "command",
       gPrivacyPane.showPasswordExceptions);
     setEventListener("useMasterPassword", "command",
       gPrivacyPane.updateMasterPasswordButton);
     setEventListener("changeMasterPassword", "command",
       gPrivacyPane.changeMasterPassword);
     setEventListener("showPasswords", "command",
       gPrivacyPane.showPasswords);
     setEventListener("addonExceptions", "command",
       gPrivacyPane.showAddonExceptions);
     setEventListener("viewCertificatesButton", "command",
                      gPrivacyPane.showCertificates);
     setEventListener("viewSecurityDevicesButton", "command",
                      gPrivacyPane.showSecurityDevices);
-    setEventListener("connectionSettings", "command",
-                     gPrivacyPane.showConnections);
     setEventListener("clearCacheButton", "command",
                      gPrivacyPane.clearCache);
 
     this._pane = document.getElementById("panePrivacy");
     this._initMasterPasswordUI();
     this._initSafeBrowsing();
     this.updateCacheSizeInputField();
     this.updateActualCacheSize();
@@ -305,29 +234,27 @@ var gPrivacyPane = {
       emeUIEnabled = emeUIEnabled && parseFloat(Services.sysinfo.get("version")) >= 6;
     }
     if (!emeUIEnabled) {
       // Don't want to rely on .hidden for the toplevel groupbox because
       // of the pane hiding/showing code potentially interfering:
       document.getElementById("drmGroup").setAttribute("style", "display: none !important");
     }
 
+    this.initDataCollection();
     if (AppConstants.MOZ_CRASHREPORTER) {
       this.initSubmitCrashes();
     }
-    this.initTelemetry();
     this.initSubmitHealthReport();
     setEventListener("submitHealthReportBox", "command",
                      gPrivacyPane.updateSubmitHealthReport);
 
-    // Append search keywords into the elements could open subdialogs.
     let bundlePrefs = document.getElementById("bundlePreferences");
     let signonBundle = document.getElementById("signonBundle");
     let pkiBundle = document.getElementById("pkiBundle");
-    let browserBundle = document.getElementById("browserBundle");
     appendSearchKeywords("passwordExceptions", [
       bundlePrefs.getString("savedLoginsExceptions_title"),
       bundlePrefs.getString("savedLoginsExceptions_desc"),
     ]);
     appendSearchKeywords("showPasswords", [
       signonBundle.getString("loginsDescriptionAll"),
     ]);
     appendSearchKeywords("trackingProtectionExceptions", [
@@ -348,27 +275,26 @@ var gPrivacyPane = {
     ]);
     appendSearchKeywords("addonExceptions", [
       bundlePrefs.getString("addons_permissions_title"),
       bundlePrefs.getString("addonspermissionstext"),
     ]);
     appendSearchKeywords("viewSecurityDevicesButton", [
       pkiBundle.getString("enable_fips"),
     ]);
-    appendSearchKeywords("browserContainersSettings", [
-      browserBundle.getString("userContextPersonal.label"),
-      browserBundle.getString("userContextWork.label"),
-      browserBundle.getString("userContextBanking.label"),
-      browserBundle.getString("userContextShopping.label"),
-    ]);
     appendSearchKeywords("siteDataSettings", [
       bundlePrefs.getString("siteDataSettings.description"),
       bundlePrefs.getString("removeAllCookies.label"),
       bundlePrefs.getString("removeSelectedCookies.label"),
     ]);
+
+    // Notify observers that the UI is now ready
+    Components.classes["@mozilla.org/observer-service;1"]
+              .getService(Components.interfaces.nsIObserverService)
+              .notifyObservers(window, "privacy-pane-loaded");
   },
 
   // TRACKING PROTECTION MODE
 
   /**
    * Selects the right item of the Tracking Protection radiogroup.
    */
   trackingProtectionReadPrefs() {
@@ -652,23 +578,16 @@ var gPrivacyPane = {
       windowTitle: bundlePreferences.getString("trackingprotectionpermissionstitle"),
       introText: bundlePreferences.getString("trackingprotectionpermissionstext"),
     };
     gSubDialog.open("chrome://browser/content/preferences/permissions.xul",
                     null, params);
   },
 
   /**
-   * Displays container panel for customising and adding containers.
-   */
-  showContainerSettings() {
-    gotoPref("containers");
-  },
-
-  /**
    * Displays the available block lists for tracking protection.
    */
   showBlockLists() {
     var bundlePreferences = document.getElementById("bundlePreferences");
     let brandName = document.getElementById("bundleBrand")
                             .getString("brandShortName");
     var params = { brandShortName: brandName,
                    windowTitle: bundlePreferences.getString("blockliststitle"),
@@ -1227,24 +1146,16 @@ var gPrivacyPane = {
 
   /**
    * Displays a dialog from which the user can manage his security devices.
    */
   showSecurityDevices() {
     gSubDialog.open("chrome://pippki/content/device_manager.xul");
   },
 
-  // NETWORK
-  /**
-   * Displays a dialog in which proxy settings may be changed.
-   */
-  showConnections() {
-    gSubDialog.open("chrome://browser/content/preferences/connection.xul");
-  },
-
   /**
    * Clears the cache.
    */
   clearCache() {
     try {
       var cache = Components.classes["@mozilla.org/netwerk/cache-storage-service;1"]
                             .getService(Components.interfaces.nsICacheStorageService);
       cache.clear();
@@ -1389,65 +1300,42 @@ var gPrivacyPane = {
 
     let result = Services.prompt.confirmEx(
       window, title, text, flags, btn0Label, null, null, null, {});
     if (result == 0) {
       SiteDataManager.removeAll();
     }
   },
 
+  initDataCollection() {
+    this._setupLearnMoreLink("toolkit.datacollection.infoURL",
+                             "dataCollectionPrivacyNotice");
+  },
+
   initSubmitCrashes() {
     this._setupLearnMoreLink("toolkit.crashreporter.infoURL",
                              "crashReporterLearnMore");
   },
 
   /**
-   * The preference/checkbox is configured in XUL.
-   *
-   * In all cases, set up the Learn More link sanely.
-   */
-  initTelemetry() {
-    this._setupLearnMoreLink("toolkit.telemetry.infoURL", "telemetryLearnMore");
-    // If we're not sending any Telemetry, disable the telemetry upload checkbox as well.
-    if (!AppConstants.MOZ_TELEMETRY_REPORTING) {
-      document.getElementById("submitTelemetryBox").setAttribute("disabled", "true");
-    }
-  },
-
-  /**
    * Set up or hide the Learn More links for various data collection options
    */
   _setupLearnMoreLink(pref, element) {
     // set up the Learn More link with the correct URL
     let url = Services.prefs.getCharPref(pref);
     let el = document.getElementById(element);
 
     if (url) {
       el.setAttribute("href", url);
     } else {
       el.setAttribute("hidden", "true");
     }
   },
 
   /**
-   * Set the status of the telemetry controls based on the input argument.
-   * @param {Boolean} aEnabled False disables the controls, true enables them.
-   */
-  setTelemetrySectionEnabled(aEnabled) {
-    // If FHR is disabled, additional data sharing should be disabled as well.
-    let disabled = !aEnabled;
-    document.getElementById("submitTelemetryBox").disabled = disabled;
-    if (disabled) {
-      // If we disable FHR, untick the telemetry checkbox.
-      Services.prefs.setBoolPref("toolkit.telemetry.enabled", false);
-    }
-    document.getElementById("telemetryDataDesc").disabled = disabled;
-  },
-
-  /**
    * Initialize the health report service reference and checkbox.
    */
   initSubmitHealthReport() {
     this._setupLearnMoreLink("datareporting.healthreport.infoURL", "FHRLearnMore");
 
     let checkbox = document.getElementById("submitHealthReportBox");
 
     // Telemetry is only sending data if MOZ_TELEMETRY_REPORTING is defined.
@@ -1456,26 +1344,24 @@ var gPrivacyPane = {
     if (Services.prefs.prefIsLocked(PREF_UPLOAD_ENABLED) ||
         !AppConstants.MOZ_TELEMETRY_REPORTING) {
       checkbox.setAttribute("disabled", "true");
       return;
     }
 
     checkbox.checked = Services.prefs.getBoolPref(PREF_UPLOAD_ENABLED) &&
                        AppConstants.MOZ_TELEMETRY_REPORTING;
-    this.setTelemetrySectionEnabled(checkbox.checked);
   },
 
   /**
    * Update the health report preference with state from checkbox.
    */
   updateSubmitHealthReport() {
     let checkbox = document.getElementById("submitHealthReportBox");
     Services.prefs.setBoolPref(PREF_UPLOAD_ENABLED, checkbox.checked);
-    this.setTelemetrySectionEnabled(checkbox.checked);
   },
 
   // Methods for Offline Apps (AppCache)
 
   /**
    * Clears the application cache.
    */
   clearOfflineAppCache() {
--- a/browser/components/preferences/in-content-new/privacy.xul
+++ b/browser/components/preferences/in-content-new/privacy.xul
@@ -75,21 +75,16 @@
   <!-- Private Browsing -->
   <preference id="browser.privatebrowsing.autostart"
               name="browser.privatebrowsing.autostart"
               type="bool"/>
   <!-- Do not track -->
   <preference id="privacy.donottrackheader.enabled"
               name="privacy.donottrackheader.enabled"
               type="bool"/>
-  <!-- DRM content -->
-  <preference id="media.eme.enabled"
-              name="media.eme.enabled"
-              type="bool"/>
-
   <!-- Popups -->
   <preference id="dom.disable_open_during_load"
               name="dom.disable_open_during_load"
               type="bool"/>
   <!-- Passwords -->
   <preference id="signon.rememberSignons" name="signon.rememberSignons" type="bool"/>
 
   <!-- XXX buttons -->
@@ -171,56 +166,58 @@
               type="bool"/>
 #endif
 
 </preferences>
 
 <stringbundle id="bundlePreferences" src="chrome://browser/locale/preferences/preferences.properties"/>
 <stringbundle id="signonBundle" src="chrome://passwordmgr/locale/passwordmgr.properties"/>
 
-<hbox id="header-privacy"
-      class="header"
+<hbox id="browserPrivacyCategory"
+      class="subcategory"
       hidden="true"
       data-category="panePrivacy">
-  <label class="header-name" flex="1">&panePrivacySecurity.title;</label>
+  <label class="header-name" flex="1">&browserPrivacy.label;</label>
 </hbox>
 
-<!-- Permissions -->
-<groupbox id="permissionsGroup" data-category="panePrivacy" hidden="true">
-  <caption><label>&permissions.label;</label></caption>
-  <separator class="thin"/>
-  <hbox align="start">
-    <checkbox id="popupPolicy" preference="dom.disable_open_during_load"
-              label="&blockPopups.label;" accesskey="&blockPopups.accesskey;"
-              onsyncfrompreference="return gPrivacyPane.updateButtons('popupPolicyButton',
-                                         'dom.disable_open_during_load');"
-              flex="1" />
-    <button id="popupPolicyButton"
+<!-- Passwords -->
+<groupbox id="passwordsGroup" orient="vertical" data-category="panePrivacy" hidden="true">
+  <caption><label>&formsAndPasswords.label;</label></caption>
+
+  <vbox id="passwordSettings">
+    <hbox id="savePasswordsBox">
+      <checkbox id="savePasswords"
+                label="&rememberLogins1.label;" accesskey="&rememberLogins1.accesskey;"
+                preference="signon.rememberSignons"
+                onsyncfrompreference="return gPrivacyPane.readSavePasswords();"
+                flex="1" />
+      <button id="passwordExceptions"
+              class="accessory-button"
+              label="&passwordExceptions.label;"
+              accesskey="&passwordExceptions.accesskey;"
+              preference="pref.privacy.disable_button.view_passwords_exceptions"
+              searchkeywords="&address.label;"/>
+    </hbox>
+    <hbox id="showPasswordBox" pack="end">
+      <button id="showPasswords"
+              class="accessory-button"
+              label="&savedLogins.label;" accesskey="&savedLogins.accesskey;"
+              preference="pref.privacy.disable_button.view_passwords"
+              searchkeywords="&savedLogins.title;"/>
+    </hbox>
+  </vbox>
+  <hbox id="masterPasswordRow">
+    <checkbox id="useMasterPassword"
+              label="&useMasterPassword.label;"
+              accesskey="&useMasterPassword.accesskey;"
+              flex="1"/>
+    <button id="changeMasterPassword"
             class="accessory-button"
-            label="&popupExceptions.label;"
-            accesskey="&popupExceptions.accesskey;"
-            searchkeywords="&address.label; &button.cancel.label; &button.ok.label;"/>
-  </hbox>
-  <hbox id="addonInstallBox">
-    <checkbox id="warnAddonInstall"
-              label="&warnOnAddonInstall.label;"
-              accesskey="&warnOnAddonInstall.accesskey;"
-              preference="xpinstall.whitelist.required"
-              onsyncfrompreference="return gPrivacyPane.readWarnAddonInstall();"
-              flex="1" />
-    <button id="addonExceptions"
-            class="accessory-button"
-            label="&addonExceptions.label;"
-            accesskey="&addonExceptions.accesskey;"
-            searchkeywords="&address.label;
-                            &allow.label;
-                            &removepermission.label;
-                            &removeallpermissions.label;
-                            &button.cancel.label;
-                            &button.ok.label;"/>
+            label="&changeMasterPassword.label;"
+            accesskey="&changeMasterPassword.accesskey;"/>
   </hbox>
 </groupbox>
 
 <!-- History -->
 <groupbox id="historyGroup" data-category="panePrivacy" hidden="true">
   <caption><label>&history.label;</label></caption>
   <hbox align="center">
     <label id="historyModeLabel"
@@ -358,52 +355,86 @@
                     accesskey="&clearOnCloseSettings.accesskey;"/>
           </hbox>
         </vbox>
       </vbox>
     </vbox>
   </deck>
 </groupbox>
 
-<!-- Passwords -->
-<groupbox id="passwordsGroup" orient="vertical" data-category="panePrivacy" hidden="true">
-  <caption><label>&formsAndPasswords.label;</label></caption>
+<!-- Address Bar -->
+<groupbox id="locationBarGroup"
+          data-category="panePrivacy"
+          hidden="true">
+  <caption><label>&addressBar.label;</label></caption>
+  <label id="locationBarSuggestionLabel">&addressBar.suggest.label;</label>
+  <checkbox id="historySuggestion" label="&locbar.history.label;"
+            accesskey="&locbar.history.accesskey;"
+            preference="browser.urlbar.suggest.history"/>
+  <checkbox id="bookmarkSuggestion" label="&locbar.bookmarks.label;"
+            accesskey="&locbar.bookmarks.accesskey;"
+            preference="browser.urlbar.suggest.bookmark"/>
+  <checkbox id="openpageSuggestion" label="&locbar.openpage.label;"
+            accesskey="&locbar.openpage.accesskey;"
+            preference="browser.urlbar.suggest.openpage"/>
+  <label class="text-link" onclick="gotoPref('general')">
+    &suggestionSettings2.label;
+  </label>
+</groupbox>
+
+<!-- Cache -->
+<groupbox id="cacheGroup" data-category="panePrivacy" hidden="true">
+  <caption><label>&httpCache.label;</label></caption>
 
-  <vbox id="passwordSettings">
-    <hbox id="savePasswordsBox">
-      <checkbox id="savePasswords"
-                label="&rememberLogins1.label;" accesskey="&rememberLogins1.accesskey;"
-                preference="signon.rememberSignons"
-                onsyncfrompreference="return gPrivacyPane.readSavePasswords();"
-                flex="1" />
-      <button id="passwordExceptions"
-              class="accessory-button"
-              label="&passwordExceptions.label;"
-              accesskey="&passwordExceptions.accesskey;"
-              preference="pref.privacy.disable_button.view_passwords_exceptions"
-              searchkeywords="&address.label;"/>
-    </hbox>
-    <hbox id="showPasswordBox" pack="end">
-      <button id="showPasswords"
-              class="accessory-button"
-              label="&savedLogins.label;" accesskey="&savedLogins.accesskey;"
-              preference="pref.privacy.disable_button.view_passwords"
-              searchkeywords="&savedLogins.title;"/>
-    </hbox>
+  <hbox align="center">
+    <label id="actualDiskCacheSize" flex="1"/>
+    <button id="clearCacheButton"
+            class="accessory-button"
+            icon="clear"
+            label="&clearCacheNow.label;" accesskey="&clearCacheNow.accesskey;"/>
+  </hbox>
+  <checkbox preference="browser.cache.disk.smart_size.enabled"
+            id="allowSmartSize"
+            onsyncfrompreference="return gPrivacyPane.readSmartSizeEnabled();"
+            label="&overrideSmartCacheSize.label;"
+            accesskey="&overrideSmartCacheSize.accesskey;"/>
+  <hbox align="center" class="indent">
+    <label id="useCacheBefore" control="cacheSize"
+            accesskey="&limitCacheSizeBefore.accesskey;">
+      &limitCacheSizeBefore.label;
+    </label>
+    <textbox id="cacheSize" type="number" size="4" max="1024"
+              aria-labelledby="useCacheBefore cacheSize useCacheAfter"/>
+    <label id="useCacheAfter" flex="1">&limitCacheSizeAfter.label;</label>
+  </hbox>
+</groupbox>
+
+<!-- Site Data -->
+<groupbox id="siteDataGroup" hidden="true" data-category="panePrivacy" data-hidden-from-search="true">
+  <caption><label>&siteData.label;</label></caption>
+
+  <hbox align="baseline">
+    <label id="totalSiteDataSize"></label>
+    <label id="siteDataLearnMoreLink" class="learnMore text-link" value="&siteDataLearnMoreLink.label;"></label>
+    <spacer flex="1" />
+    <button id="clearSiteDataButton"
+            class="accessory-button"
+            icon="clear"
+            label="&clearSiteData.label;" accesskey="&clearSiteData.accesskey;"/>
+  </hbox>
+  <vbox align="end">
+    <button id="siteDataSettings"
+            class="accessory-button"
+            label="&siteDataSettings.label;"
+            accesskey="&siteDataSettings.accesskey;"
+            searchkeywords="&window.title;
+                            &hostCol.label;
+                            &statusCol.label;
+                            &usageCol.label;"/>
   </vbox>
-  <hbox id="masterPasswordRow">
-    <checkbox id="useMasterPassword"
-              label="&useMasterPassword.label;"
-              accesskey="&useMasterPassword.accesskey;"
-              flex="1"/>
-    <button id="changeMasterPassword"
-            class="accessory-button"
-            label="&changeMasterPassword.label;"
-            accesskey="&changeMasterPassword.accesskey;"/>
-  </hbox>
 </groupbox>
 
 <!-- Tracking -->
 <groupbox id="trackingGroup" data-category="panePrivacy" hidden="true">
   <caption><label>&trackingProtectionHeader2.label;</label></caption>
   <vbox>
     <hbox align="start">
       <vbox flex="1">
@@ -468,19 +499,25 @@
       <radiogroup id="doNotTrackRadioGroup" aria-labelledby="doNotTrackDesc" preference="privacy.donottrackheader.enabled">
         <radio value="false" label="&doNotTrack.default.label;"/>
         <radio value="true" label="&doNotTrack.always.label;"/>
       </radiogroup>
     </vbox>
   </vbox>
 </groupbox>
 
-<!-- Notifications -->
-<groupbox id="notificationsGroup" data-category="panePrivacy" hidden="true">
-  <caption><label>&notificationsPolicy.label;</label></caption>
+<hbox id="permissionsCategory"
+      class="subcategory"
+      hidden="true"
+      data-category="panePrivacy">
+  <label class="header-name" flex="1">&permissions.label;</label>
+</hbox>
+
+<!-- Permissions -->
+<groupbox id="permissionsGroup" data-category="panePrivacy" hidden="true">
   <grid>
     <columns>
       <column flex="1"/>
       <column/>
     </columns>
     <rows>
       <row id="notificationsPolicyRow" align="center">
         <hbox flex="1">
@@ -502,41 +539,98 @@
     </rows>
   </grid>
   <vbox id="notificationsDoNotDisturbBox" hidden="true">
     <checkbox id="notificationsDoNotDisturb" label="&notificationsDoNotDisturb.label;"
               accesskey="&notificationsDoNotDisturb.accesskey;"/>
     <label id="notificationsDoNotDisturbDetails"
            class="indent">&notificationsDoNotDisturbDetails.value;</label>
   </vbox>
+
+  <hbox align="start">
+    <checkbox id="popupPolicy" preference="dom.disable_open_during_load"
+              label="&blockPopups.label;" accesskey="&blockPopups.accesskey;"
+              onsyncfrompreference="return gPrivacyPane.updateButtons('popupPolicyButton',
+                                         'dom.disable_open_during_load');"
+              flex="1" />
+    <button id="popupPolicyButton"
+            class="accessory-button"
+            label="&popupExceptions.label;"
+            accesskey="&popupExceptions.accesskey;"
+            searchkeywords="&address.label; &button.cancel.label; &button.ok.label;"/>
+  </hbox>
+
+  <hbox id="addonInstallBox">
+    <checkbox id="warnAddonInstall"
+              label="&warnOnAddonInstall.label;"
+              accesskey="&warnOnAddonInstall.accesskey;"
+              preference="xpinstall.whitelist.required"
+              onsyncfrompreference="return gPrivacyPane.readWarnAddonInstall();"
+              flex="1" />
+    <button id="addonExceptions"
+            class="accessory-button"
+            label="&addonExceptions.label;"
+            accesskey="&addonExceptions.accesskey;"
+            searchkeywords="&address.label;
+                            &allow.label;
+                            &removepermission.label;
+                            &removeallpermissions.label;
+                            &button.cancel.label;
+                            &button.ok.label;"/>
+  </hbox>
 </groupbox>
 
-<!-- Location Bar -->
-<groupbox id="locationBarGroup"
-          data-category="panePrivacy"
-          hidden="true">
-  <caption><label>&locationBar.label;</label></caption>
-  <label id="locationBarSuggestionLabel">&locbar.suggest2.label;</label>
-  <checkbox id="historySuggestion" label="&locbar.history.label;"
-            accesskey="&locbar.history.accesskey;"
-            preference="browser.urlbar.suggest.history"/>
-  <checkbox id="bookmarkSuggestion" label="&locbar.bookmarks.label;"
-            accesskey="&locbar.bookmarks.accesskey;"
-            preference="browser.urlbar.suggest.bookmark"/>
-  <checkbox id="openpageSuggestion" label="&locbar.openpage.label;"
-            accesskey="&locbar.openpage.accesskey;"
-            preference="browser.urlbar.suggest.openpage"/>
-  <label class="text-link" onclick="gotoPref('general')">
-    &suggestionSettings2.label;
-  </label>
+<hbox id="dataCollectionCategory"
+      class="subcategory"
+      hidden="true"
+      data-category="panePrivacy">
+  <label class="header-name" flex="1">&dataCollection.label;</label>
+</hbox>
+
+<!-- Firefox Data Collection and Use -->
+#ifdef MOZ_DATA_REPORTING
+<groupbox id="dataCollectionGroup" data-category="panePrivacy" data-subcategory="reports" hidden="true">
+  <description>
+    &dataCollectionDesc.label;<label id="dataCollectionPrivacyNotice" class="learnMore text-link">&dataCollectionPrivacyNotice.label;</label>
+  </description>
+
+  <vbox>
+    <hbox align="center">
+      <checkbox id="submitHealthReportBox" label="&enableHealthReport1.label;"
+                accesskey="&enableHealthReport1.accesskey;"/>
+      <label id="FHRLearnMore"
+             class="learnMore text-link">&healthReportLearnMore.label;</label>
+    </hbox>
+#ifndef MOZ_TELEMETRY_REPORTING
+    <description id="TelemetryDisabledDesc" class="indent" control="telemetryGroup">&healthReportingDisabled.label;</description>
+#endif
+  </vbox>
+#ifdef MOZ_CRASHREPORTER
+  <hbox align="center">
+    <checkbox id="automaticallySubmitCrashesBox"
+              preference="browser.crashReports.unsubmittedCheck.autoSubmit"
+              label="&alwaysSubmitCrashReports1.label;"
+              accesskey="&alwaysSubmitCrashReports1.accesskey;"/>
+    <label id="crashReporterLearnMore"
+           class="learnMore text-link">&crashReporterLearnMore.label;</label>
+  </hbox>
+#endif
 </groupbox>
+#endif
 
-<!-- Forgery (phishing) UI Security -->
-<groupbox id="phishingGroup" data-category="panePrivacy" hidden="true">
-  <caption><label>&security.label;</label></caption>
+<hbox id="securityCategory"
+      class="subcategory"
+      hidden="true"
+      data-category="panePrivacy">
+  <label class="header-name" flex="1">&security.label;</label>
+</hbox>
+
+<!-- addons, forgery (phishing) UI Security -->
+<groupbox id="addonsPhishingGroup" data-category="panePrivacy" hidden="true">
+  <caption><label>&phishingProtection.label;</label></caption>
   <checkbox id="enableSafeBrowsing"
             label="&enableSafeBrowsing.label;"
             accesskey="&enableSafeBrowsing.accesskey;" />
   <vbox class="indent">
     <checkbox id="blockDownloads"
               label="&blockDownloads.label;"
               accesskey="&blockDownloads.accesskey;" />
     <checkbox id="blockUncommonUnwanted"
@@ -608,123 +702,16 @@
                               &devmgr.button.logout.label;
                               &devmgr.button.changepw.label;
                               &devmgr.button.load.label;
                               &devmgr.button.unload.label;"/>
     </vbox>
   </hbox>
 </groupbox>
 
-<!-- DRM Content -->
-<groupbox id="drmGroup" data-category="panePrivacy" hidden="true">
-  <caption><label>&drmContent.label;</label></caption>
-  <grid id="contentGrid2">
-    <columns>
-      <column flex="1"/>
-      <column/>
-    </columns>
-    <rows id="contentRows-2">
-      <row id="playDRMContentRow">
-        <hbox align="center">
-          <checkbox id="playDRMContent" preference="media.eme.enabled"
-                    label="&playDRMContent.label;" accesskey="&playDRMContent.accesskey;"/>
-          <label id="playDRMContentLink" class="learnMore text-link">
-            &playDRMContent.learnMore.label;
-          </label>
-        </hbox>
-      </row>
-    </rows>
-  </grid>
-</groupbox>
-
-<!-- Containers -->
-<groupbox id="browserContainersGroup" data-category="panePrivacy" hidden="true">
-  <vbox id="browserContainersbox" hidden="true">
-    <caption><label>&browserContainersHeader.label;</label></caption>
-    <hbox align="center">
-      <checkbox id="browserContainersCheckbox"
-                label="&browserContainersEnabled.label;"
-                accesskey="&browserContainersEnabled.accesskey;"
-                preference="privacy.userContext.enabled"
-                onsyncfrompreference="return gPrivacyPane.readBrowserContainersCheckbox();"/>
-      <label id="browserContainersLearnMore" class="learnMore text-link">
-        &browserContainersLearnMore.label;
-      </label>
-      <spacer flex="1"/>
-      <button id="browserContainersSettings"
-              class="accessory-button"
-              label="&browserContainersSettings.label;"
-              accesskey="&browserContainersSettings.accesskey;"
-              searchkeywords="&addButton.label;
-                              &preferencesButton.label;
-                              &removeButton.label;"/>
-    </hbox>
-  </vbox>
-</groupbox>
-
-<!-- Network -->
-<!-- Connection -->
-<groupbox id="connectionGroup" data-category="panePrivacy" hidden="true">
-  <caption><label>&connection.label;</label></caption>
-
-  <hbox align="center">
-    <description flex="1" control="connectionSettings">&connectionDesc.label;</description>
-    <button id="connectionSettings"
-            class="accessory-button"
-            icon="network"
-            label="&connectionSettings.label;"
-            accesskey="&connectionSettings.accesskey;"
-            searchkeywords="&connectionsDialog.title;
-                            &noProxyTypeRadio.label;
-                            &WPADTypeRadio.label;
-                            &systemTypeRadio.label;
-                            &manualTypeRadio.label;
-                            &http.label;
-                            &ssl.label;
-                            &ftp.label;
-                            &socks.label;
-                            &socks4.label;
-                            &socks5.label;
-                            &noproxy.label;
-                            &noproxyExplain.label;
-                            &shareproxy.label;
-                            &autoTypeRadio.label;
-                            &reload.label;
-                            &autologinproxy.label;
-                            &socksRemoteDNS.label2;"/>
-  </hbox>
-</groupbox>
-
-<!-- Cache -->
-<groupbox id="cacheGroup" data-category="panePrivacy" hidden="true">
-  <caption><label>&httpCache.label;</label></caption>
-
-  <hbox align="center">
-    <label id="actualDiskCacheSize" flex="1"/>
-    <button id="clearCacheButton"
-            class="accessory-button"
-            icon="clear"
-            label="&clearCacheNow.label;" accesskey="&clearCacheNow.accesskey;"/>
-  </hbox>
-  <checkbox preference="browser.cache.disk.smart_size.enabled"
-            id="allowSmartSize"
-            onsyncfrompreference="return gPrivacyPane.readSmartSizeEnabled();"
-            label="&overrideSmartCacheSize.label;"
-            accesskey="&overrideSmartCacheSize.accesskey;"/>
-  <hbox align="center" class="indent">
-    <label id="useCacheBefore" control="cacheSize"
-            accesskey="&limitCacheSizeBefore.accesskey;">
-      &limitCacheSizeBefore.label;
-    </label>
-    <textbox id="cacheSize" type="number" size="4" max="1024"
-              aria-labelledby="useCacheBefore cacheSize useCacheAfter"/>
-    <label id="useCacheAfter" flex="1">&limitCacheSizeAfter.label;</label>
-  </hbox>
-</groupbox>
-
 <!-- Offline apps -->
 <groupbox id="offlineGroup" data-category="panePrivacy" hidden="true" data-hidden-from-search="true">
   <caption><label>&offlineStorage2.label;</label></caption>
 
   <hbox align="center">
     <label id="actualAppCacheSize" flex="1"/>
     <button id="clearOfflineAppCacheButton"
             class="accessory-button"
@@ -754,78 +741,8 @@
       <button id="offlineAppsListRemove"
               class="accessory-button"
               disabled="true"
               label="&offlineAppsListRemove.label;"
               accesskey="&offlineAppsListRemove.accesskey;"/>
     </vbox>
   </hbox>
 </groupbox>
-
-<!-- Site Data -->
-<groupbox id="siteDataGroup" hidden="true" data-category="panePrivacy" data-hidden-from-search="true">
-  <caption><label>&siteData.label;</label></caption>
-
-  <hbox align="baseline">
-    <label id="totalSiteDataSize"></label>
-    <label id="siteDataLearnMoreLink" class="learnMore text-link" value="&siteDataLearnMoreLink.label;"></label>
-    <spacer flex="1" />
-    <button id="clearSiteDataButton"
-            class="accessory-button"
-            icon="clear"
-            label="&clearSiteData.label;" accesskey="&clearSiteData.accesskey;"/>
-  </hbox>
-  <vbox align="end">
-    <button id="siteDataSettings"
-            class="accessory-button"
-            label="&siteDataSettings.label;"
-            accesskey="&siteDataSettings.accesskey;"
-            searchkeywords="&window.title;
-                            &hostCol.label;
-                            &statusCol.label;
-                            &usageCol.label;"/>
-  </vbox>
-</groupbox>
-
-<!-- Data Choices -->
-#ifdef MOZ_DATA_REPORTING
-
-<groupbox id="telemetryGroup" data-category="panePrivacy" data-subcategory="reports" hidden="true">
-<caption><label>&reports.label;</label></caption>
-#ifndef MOZ_TELEMETRY_REPORTING
-  <description id="TelemetryDisabledDesc" control="telemetryGroup">&healthReportingDisabled.label;</description>
-#endif
-
-  <hbox align="center">
-    <checkbox id="submitHealthReportBox" label="&enableHealthReport.label;"
-              accesskey="&enableHealthReport.accesskey;"/>
-    <label id="FHRLearnMore"
-           class="learnMore text-link">&healthReportLearnMore.label;</label>
-  </hbox>
-  <description class="indent">&healthReportDesc.label;</description>
-  <vbox class="indent">
-    <hbox align="center">
-      <checkbox id="submitTelemetryBox" preference="toolkit.telemetry.enabled"
-                label="&enableTelemetryData.label;"
-                accesskey="&enableTelemetryData.accesskey;"/>
-      <label id="telemetryLearnMore"
-             class="learnMore text-link">&telemetryLearnMore.label;</label>
-    </hbox>
-    <description id="telemetryDataDesc"
-                 class="indent">&telemetryDesc.label;</description>
-  </vbox>
-</groupbox>
-
-#ifdef MOZ_CRASHREPORTER
-<groupbox id="crashReporterGroup" data-category="panePrivacy" data-subcategory="reports" hidden="true">
-  <hbox align="center">
-    <checkbox id="automaticallySubmitCrashesBox"
-              preference="browser.crashReports.unsubmittedCheck.autoSubmit"
-              label="&alwaysSubmitCrashReports.label;"
-              accesskey="&alwaysSubmitCrashReports.accesskey;"/>
-    <label id="crashReporterLearnMore"
-           class="learnMore text-link">&crashReporterLearnMore.label;</label>
-  </hbox>
-  <description class="indent">&crashReporterDesc2.label;</description>
-</groupbox>
-
-#endif
-#endif
copy from browser/components/preferences/in-content/search.js
copy to browser/components/preferences/in-content-new/search.js
copy from browser/components/preferences/in-content/search.xul
copy to browser/components/preferences/in-content-new/search.xul
--- a/browser/components/preferences/in-content/search.xul
+++ b/browser/components/preferences/in-content-new/search.xul
@@ -10,53 +10,52 @@
 
       <preference id="browser.search.hiddenOneOffs"
                   name="browser.search.hiddenOneOffs"
                   type="unichar"/>
 
     </preferences>
 
     <script type="application/javascript"
-            src="chrome://browser/content/preferences/in-content/search.js"/>
+            src="chrome://browser/content/preferences/in-content-new/search.js"/>
 
     <stringbundle id="engineManagerBundle" src="chrome://browser/locale/engineManager.properties"/>
 
-    <hbox id="header-search"
-          class="header"
+    <hbox id="searchCategory"
+          class="subcategory"
           hidden="true"
           data-category="paneSearch">
       <label class="header-name" flex="1">&paneSearch.title;</label>
-      <html:a class="help-button" target="_blank" aria-label="&helpButton.label;"></html:a>
     </hbox>
 
     <!-- Default Search Engine -->
     <groupbox id="defaultEngineGroup" align="start" data-category="paneSearch">
       <caption label="&defaultSearchEngine.label;"/>
-      <label>&chooseYourDefaultSearchEngine.label;</label>
+      <label>&chooseYourDefaultSearchEngine2.label;</label>
       <menulist id="defaultEngine">
         <menupopup/>
       </menulist>
       <checkbox id="suggestionsInSearchFieldsCheckbox"
                 label="&provideSearchSuggestions.label;"
                 accesskey="&provideSearchSuggestions.accesskey;"
                 preference="browser.search.suggest.enabled"/>
       <vbox class="indent">
-        <checkbox id="urlBarSuggestion" label="&showURLBarSuggestions.label;"
-                  accesskey="&showURLBarSuggestions.accesskey;"
+        <checkbox id="urlBarSuggestion" label="&showURLBarSuggestions2.label;"
+                  accesskey="&showURLBarSuggestions2.accesskey;"
                   preference="browser.urlbar.suggest.searches"/>
         <hbox id="urlBarSuggestionPermanentPBLabel"
               align="center" class="indent">
           <label flex="1">&urlBarSuggestionsPermanentPB.label;</label>
         </hbox>
       </vbox>
     </groupbox>
 
     <groupbox id="oneClickSearchProvidersGroup" data-category="paneSearch">
       <caption label="&oneClickSearchEngines.label;"/>
-      <label>&chooseWhichOneToDisplay.label;</label>
+      <label>&chooseWhichOneToDisplay2.label;</label>
 
       <tree id="engineList" flex="1" rows="8" hidecolumnpicker="true" editable="true"
             seltype="single">
         <treechildren id="engineChildren" flex="1"/>
         <treecols>
           <treecol id="engineShown" type="checkbox" editable="true" sortable="false"/>
           <treecol id="engineName" flex="4" label="&engineNameColumn.label;" sortable="false"/>
           <treecol id="engineKeyword" flex="1" label="&engineKeywordColumn.label;" editable="true"
@@ -76,11 +75,11 @@
                 accesskey="&removeEngine.accesskey;"
                 disabled="true"
                 />
       </hbox>
 
       <separator class="thin"/>
 
       <hbox id="addEnginesBox" pack="start">
-        <label id="addEngines" class="text-link" value="&addMoreSearchEngines.label;"/>
+        <label id="addEngines" class="text-link" value="&findMoreSearchEngines.label;"/>
       </hbox>
     </groupbox>
--- a/browser/components/preferences/in-content-new/sync.js
+++ b/browser/components/preferences/in-content-new/sync.js
@@ -125,16 +125,21 @@ var gSyncPane = {
     document.getElementById("tosPP-small-ToS").setAttribute("href", Weave.Svc.Prefs.get("fxa.termsURL"));
     document.getElementById("tosPP-small-PP").setAttribute("href", Weave.Svc.Prefs.get("fxa.privacyURL"));
 
     fxAccounts.promiseAccountsManageURI(this._getEntryPoint()).then(accountsManageURI => {
       document.getElementById("verifiedManage").setAttribute("href", accountsManageURI);
     });
 
     this.updateWeavePrefs();
+
+    // Notify observers that the UI is now ready
+    Components.classes["@mozilla.org/observer-service;1"]
+              .getService(Components.interfaces.nsIObserverService)
+              .notifyObservers(window, "sync-pane-loaded");
   },
 
   _toggleComputerNameControls(editMode) {
     let textbox = document.getElementById("fxaSyncComputerName");
     textbox.disabled = !editMode;
     document.getElementById("fxaChangeDeviceName").hidden = editMode;
     document.getElementById("fxaCancelChangeDeviceName").hidden = !editMode;
     document.getElementById("fxaSaveChangeDeviceName").hidden = !editMode;
--- a/browser/components/preferences/in-content-new/sync.xul
+++ b/browser/components/preferences/in-content-new/sync.xul
@@ -23,18 +23,18 @@
   <preference id="engine.passwords"
               name="services.sync.engine.passwords"
               type="bool"/>
 </preferences>
 
 <script type="application/javascript"
         src="chrome://browser/content/preferences/in-content-new/sync.js"/>
 
-<hbox id="header-sync"
-      class="header"
+<hbox id="firefoxAccountCategory"
+      class="searchCategory"
       hidden="true"
       data-category="paneSync">
   <label class="header-name" flex="1">&paneSync1.title;</label>
 </hbox>
 
 <deck id="weavePrefsDeck" data-category="paneSync" hidden="true">
   <vbox id="noFxaAccount">
     <hbox>
--- a/browser/components/preferences/in-content-new/tests/browser.ini
+++ b/browser/components/preferences/in-content-new/tests/browser.ini
@@ -22,17 +22,19 @@ skip-if = !updater
 [browser_bug795764_cachedisabled.js]
 [browser_bug1018066_resetScrollPosition.js]
 [browser_bug1020245_openPreferences_to_paneContent.js]
 [browser_bug1184989_prevent_scrolling_when_preferences_flipped.js]
 [browser_engines.js]
 support-files =
   browser_bug1184989_prevent_scrolling_when_preferences_flipped.xul
 [browser_change_app_handler.js]
-skip-if = os != "win" # This test tests the windows-specific app selection dialog, so can't run on non-Windows
+skip-if = os != "win" || (os == "win" && os_version == "6.1")
+# This test tests the windows-specific app selection dialog, so can't run on non-Windows.
+# Skip the test on Window 7, see the detail at Bug 1381706.
 [browser_checkspelling.js]
 [browser_connection.js]
 [browser_connection_bug388287.js]
 [browser_cookies_exceptions.js]
 [browser_defaultbrowser_alwayscheck.js]
 [browser_healthreport.js]
 skip-if = true || !healthreport # Bug 1185403 for the "true"
 [browser_homepages_filter_aboutpreferences.js]
@@ -48,17 +50,18 @@ skip-if = e10s
 [browser_proxy_backup.js]
 [browser_privacypane_1.js]
 [browser_privacypane_3.js]
 [browser_privacypane_4.js]
 [browser_privacypane_5.js]
 [browser_privacypane_8.js]
 [browser_sanitizeOnShutdown_prefLocked.js]
 [browser_searchsuggestions.js]
-[browser_security.js]
+[browser_security-1.js]
+[browser_security-2.js]
 [browser_siteData.js]
 [browser_siteData2.js]
 [browser_site_login_exceptions.js]
 [browser_subdialogs.js]
 support-files =
   subdialog.xul
   subdialog2.xul
 [browser_telemetry.js]
--- a/browser/components/preferences/in-content-new/tests/browser_applications_selection.js
+++ b/browser/components/preferences/in-content-new/tests/browser_applications_selection.js
@@ -1,17 +1,17 @@
 var win;
 var feedItem;
 var container;
 
 SimpleTest.requestCompleteLog();
 
 add_task(async function setup() {
-  await openPreferencesViaOpenPreferencesAPI("applications", {leaveOpen: true});
-  info("Preferences page opened on the applications pane.");
+  await openPreferencesViaOpenPreferencesAPI("paneGeneral", {leaveOpen: true});
+  info("Preferences page opened on the paneGeneral pane.");
 
   registerCleanupFunction(() => {
     gBrowser.removeCurrentTab();
   });
 });
 
 add_task(async function getFeedItem() {
   win = gBrowser.selectedBrowser.contentWindow;
--- a/browser/components/preferences/in-content-new/tests/browser_bug1018066_resetScrollPosition.js
+++ b/browser/components/preferences/in-content-new/tests/browser_bug1018066_resetScrollPosition.js
@@ -6,19 +6,18 @@ registerCleanupFunction(function() {
   window.resizeTo(window.outerWidth, originalWindowHeight);
   while (gBrowser.tabs[1])
     gBrowser.removeTab(gBrowser.tabs[1]);
 });
 
 add_task(async function() {
   originalWindowHeight = window.outerHeight;
   window.resizeTo(window.outerWidth, 300);
-  let prefs = await openPreferencesViaOpenPreferencesAPI("paneApplications", {leaveOpen: true});
-  is(prefs.selectedPane, "paneApplications", "Applications pane was selected");
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneSearch", {leaveOpen: true});
+  is(prefs.selectedPane, "paneSearch", "Search pane was selected");
   let mainContent = gBrowser.contentDocument.querySelector(".main-content");
   mainContent.scrollTop = 50;
   is(mainContent.scrollTop, 50, "main-content should be scrolled 50 pixels");
 
   gBrowser.contentWindow.gotoPref("paneGeneral");
   is(mainContent.scrollTop, 0,
      "Switching to a different category should reset the scroll position");
 });
-
--- a/browser/components/preferences/in-content-new/tests/browser_bug1020245_openPreferences_to_paneContent.js
+++ b/browser/components/preferences/in-content-new/tests/browser_bug1020245_openPreferences_to_paneContent.js
@@ -6,60 +6,47 @@ Services.prefs.setBoolPref("browser.pref
 registerCleanupFunction(function() {
   Services.prefs.clearUserPref("browser.preferences.instantApply");
 });
 
 // Test opening to the differerent panes and subcategories in Preferences
 add_task(async function() {
   let prefs = await openPreferencesViaOpenPreferencesAPI("panePrivacy");
   is(prefs.selectedPane, "panePrivacy", "Privacy pane was selected");
-  prefs = await openPreferencesViaOpenPreferencesAPI("advanced");
-  is(prefs.selectedPane, "paneAdvanced", "Advanced pane was selected");
   prefs = await openPreferencesViaHash("privacy");
   is(prefs.selectedPane, "panePrivacy", "Privacy pane is selected when hash is 'privacy'");
   prefs = await openPreferencesViaOpenPreferencesAPI("nonexistant-category");
   is(prefs.selectedPane, "paneGeneral", "General pane is selected by default when a nonexistant-category is requested");
   prefs = await openPreferencesViaHash("nonexistant-category");
   is(prefs.selectedPane, "paneGeneral", "General pane is selected when hash is a nonexistant-category");
   prefs = await openPreferencesViaHash();
   is(prefs.selectedPane, "paneGeneral", "General pane is selected by default");
   prefs = await openPreferencesViaOpenPreferencesAPI("privacy-reports", {leaveOpen: true});
   is(prefs.selectedPane, "panePrivacy", "Privacy pane is selected by default");
   let doc = gBrowser.contentDocument;
   is(doc.location.hash, "#privacy", "The subcategory should be removed from the URI");
   ok(doc.querySelector("#locationBarGroup").hidden, "Location Bar prefs should be hidden when only Reports are requested");
-  ok(!doc.querySelector("#header-privacy").hidden, "The header should be visible when a subcategory is requested");
-  await BrowserTestUtils.removeTab(gBrowser.selectedTab);
-  prefs = await openPreferencesViaOpenPreferencesAPI("general-search", {leaveOpen: true});
-  is(prefs.selectedPane, "paneGeneral", "General pane is selected by default");
-  doc = gBrowser.contentDocument;
-  is(doc.location.hash, "#general", "The subcategory should be removed from the URI");
-  ok(doc.querySelector("#startupGroup").hidden, "Startup should be hidden when only Search is requested");
-  ok(!doc.querySelector("#engineList").hidden, "The search engine list should be visible when Search is requested");
   await BrowserTestUtils.removeTab(gBrowser.selectedTab);
 });
 
 // Test opening Preferences with subcategory on an existing Preferences tab. See bug 1358475.
 add_task(async function() {
-  let prefs = await openPreferencesViaOpenPreferencesAPI("general-search", {leaveOpen: true});
+  let prefs = await openPreferencesViaOpenPreferencesAPI("general", {leaveOpen: true});
   is(prefs.selectedPane, "paneGeneral", "General pane is selected by default");
   let doc = gBrowser.contentDocument;
   is(doc.location.hash, "#general", "The subcategory should be removed from the URI");
-  ok(doc.querySelector("#startupGroup").hidden, "Startup should be hidden when only Search is requested");
-  ok(!doc.querySelector("#engineList").hidden, "The search engine list should be visible when Search is requested");
   // The reasons that here just call the `openPreferences` API without the helping function are
   //   - already opened one about:preferences tab up there and
   //   - the goal is to test on the existing tab and
   //   - using `openPreferencesViaOpenPreferencesAPI` would introduce more handling of additional about:blank and unneccessary event
   openPreferences("privacy-reports");
   let selectedPane = gBrowser.contentWindow.history.state;
   is(selectedPane, "panePrivacy", "Privacy pane should be selected");
   is(doc.location.hash, "#privacy", "The subcategory should be removed from the URI");
   ok(doc.querySelector("#locationBarGroup").hidden, "Location Bar prefs should be hidden when only Reports are requested");
-  ok(!doc.querySelector("#header-privacy").hidden, "The header should be visible when a subcategory is requested");
   await BrowserTestUtils.removeTab(gBrowser.selectedTab);
 });
 
 
 function openPreferencesViaHash(aPane) {
   return new Promise(resolve => {
     gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, "about:preferences" + (aPane ? "#" + aPane : ""));
     let newTabBrowser = gBrowser.selectedBrowser;
--- a/browser/components/preferences/in-content-new/tests/browser_bug1184989_prevent_scrolling_when_preferences_flipped.js
+++ b/browser/components/preferences/in-content-new/tests/browser_bug1184989_prevent_scrolling_when_preferences_flipped.js
@@ -35,17 +35,17 @@ add_task(async function() {
 
     // Test radio
     let radiogroup = doc.getElementById("radiogroup");
     radiogroup.focus();
     EventUtils.synthesizeKey(" ", {});
     await checkPageScrolling(container, "radio");
   });
 
-  await BrowserTestUtils.withNewTab({ gBrowser, url: "about:preferences" }, async function(browser) {
+  await BrowserTestUtils.withNewTab({ gBrowser, url: "about:preferences#search" }, async function(browser) {
     let doc = browser.conten