Bug 733469 - Move the applications preferences to in-content UI. r=jaws r=bmcbride
authorJon Rietveld <jon.rietveld@gmail.com>
Tue, 08 May 2012 19:19:58 -0700
changeset 93578 bb179b7cf7222eb12b085a1be1691a6776da73ed
parent 93577 68e7c139e580502a3631385a5645bcdffd5dedb2
child 93579 4953a39c52e6e841eddad41975d0420eabe339e3
push id9210
push userjwein@mozilla.com
push dateWed, 09 May 2012 05:35:43 +0000
treeherdermozilla-inbound@8b195889f55c [default view] [failures only]
perfherder[talos] [build metrics] [platform microbench] (compared to previous push)
reviewersjaws, bmcbride
bugs733469
milestone15.0a1
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
Bug 733469 - Move the applications preferences to in-content UI. r=jaws r=bmcbride
browser/components/preferences/in-content/applications.js
browser/components/preferences/in-content/applications.xul
browser/components/preferences/in-content/jar.mn
browser/components/preferences/in-content/preferences.js
browser/components/preferences/in-content/preferences.xul
browser/themes/gnomestripe/preferences/in-content/preferences.css
browser/themes/pinstripe/preferences/in-content/preferences.css
browser/themes/winstripe/preferences/in-content/preferences.css
new file mode 100644
--- /dev/null
+++ b/browser/components/preferences/in-content/applications.js
@@ -0,0 +1,1821 @@
+/* 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/. */
+
+//****************************************************************************//
+// 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 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;
+
+/*
+#ifdef MOZ_WIDGET_GTK2
+*/
+const ICON_URL_APP      = "moz-icon://dummy.exe?size=16";
+/*
+#else
+*/
+const ICON_URL_APP      = "chrome://browser/skin/preferences/application.png";
+/*
+#endif
+*/
+
+// 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) {
+#ifdef XP_WIN
+  if (file instanceof Ci.nsILocalFileWin) {
+    try {
+      return file.getVersionInfoField("FileDescription");
+    } catch (e) {}
+  }
+#endif
+#ifdef XP_MACOSX
+  if (file instanceof Ci.nsILocalFileMac) {
+    try {
+      return file.bundleDisplayName;
+    } catch (e) {}
+  }
+#endif
+  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: function() {
+    return this._index < this._contents.length;
+  },
+
+  getNext: function() {
+    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 navigator.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: function(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: function(aNewHandler) {
+    var possibleApps = this.possibleApplicationHandlers.enumerate();
+    while (possibleApps.hasMoreElements()) {
+      if (possibleApps.getNext().equals(aNewHandler))
+        return;
+    }
+    this.possibleApplicationHandlers.appendElement(aNewHandler, false);
+  },
+
+  removePossibleApplicationHandler: function(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.plugin && !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;
+      else
+        return Ci.nsIHandlerInfo.saveToDisk;
+    }
+
+    return this.wrappedHandlerInfo.preferredAction;
+  },
+
+  set preferredAction(aNewValue) {
+    // 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.plugin && 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: function() {
+    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: function() {
+    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: function() {
+    var disabledPluginTypes = this._getDisabledPluginTypes();
+
+    var type = this.type;
+    disabledPluginTypes = disabledPluginTypes.filter(function(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: function() {
+    this._handlerSvc.store(this.wrappedHandlerInfo);
+  },
+
+
+  //**************************************************************************//
+  // Icons
+
+  get smallIcon() {
+    return this._getIcon(16);
+  },
+
+  _getIcon: function(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:
+#ifdef HAVE_SHELL_SERVICE
+    getShellService(),
+#else
+    null,
+#endif
+
+
+  //**************************************************************************//
+  // 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: function(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: function() {
+        return new ArrayEnumerator(this._inner);
+      },
+
+      appendElement: function(aHandlerApp, aWeak) {
+        this._inner.push(aHandlerApp);
+      },
+
+      removeElementAt: function(aIndex) {
+        this._removed.push(this._inner[aIndex]);
+        this._inner.splice(aIndex, 1);
+      },
+
+      queryElementAt: function(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, false);
+    }
+
+    // Add the registered web handlers.  There can be any number of these.
+    var webHandlers = this._converterSvc.getContentHandlers(this.type);
+    for each (let webHandler in webHandlers)
+      this._possibleApplicationHandlers.appendElement(webHandler, false);
+
+    return this._possibleApplicationHandlers;
+  },
+
+  __defaultApplicationHandler: undefined,
+  get _defaultApplicationHandler() {
+    if (typeof this.__defaultApplicationHandler != "undefined")
+      return this.__defaultApplicationHandler;
+
+    var defaultFeedReader = null;
+#ifdef HAVE_SHELL_SERVICE
+    try {
+      defaultFeedReader = this._shellSvc.defaultFeedReader;
+    }
+    catch(ex) {
+      // no default reader or _shellSvc is null
+    }
+#endif
+
+    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() {
+#ifdef HAVE_SHELL_SERVICE
+    try {
+      if (this._shellSvc.defaultFeedReader)
+        return true;
+    }
+    catch(ex) {
+      // no default reader or _shellSvc is null
+    }
+#endif
+
+    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: function() {
+    for each (let app in 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"
+}
+
+
+//****************************************************************************//
+// 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() {
+    // 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, false);
+    this._prefSvc.addObserver(PREF_HIDE_PLUGINS_WITHOUT_EXTENSIONS, this, false);
+    this._prefSvc.addObserver(PREF_FEED_SELECTED_APP, this, false);
+    this._prefSvc.addObserver(PREF_FEED_SELECTED_WEB, this, false);
+    this._prefSvc.addObserver(PREF_FEED_SELECTED_ACTION, this, false);
+    this._prefSvc.addObserver(PREF_FEED_SELECTED_READER, this, false);
+
+    this._prefSvc.addObserver(PREF_VIDEO_FEED_SELECTED_APP, this, false);
+    this._prefSvc.addObserver(PREF_VIDEO_FEED_SELECTED_WEB, this, false);
+    this._prefSvc.addObserver(PREF_VIDEO_FEED_SELECTED_ACTION, this, false);
+    this._prefSvc.addObserver(PREF_VIDEO_FEED_SELECTED_READER, this, false);
+
+    this._prefSvc.addObserver(PREF_AUDIO_FEED_SELECTED_APP, this, false);
+    this._prefSvc.addObserver(PREF_AUDIO_FEED_SELECTED_WEB, this, false);
+    this._prefSvc.addObserver(PREF_AUDIO_FEED_SELECTED_ACTION, this, false);
+    this._prefSvc.addObserver(PREF_AUDIO_FEED_SELECTED_READER, this, false);
+
+
+    // Listen for window unload so we can remove our preference observers.
+    window.addEventListener("unload", this, false);
+
+    // 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", null);
+    }
+    setTimeout(_delayedPaneLoad, 0, this);
+  },
+
+  destroy: function() {
+    window.removeEventListener("unload", this, false);
+    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: function(aIID) {
+    if (aIID.equals(Ci.nsIObserver) ||
+        aIID.equals(Ci.nsIDOMEventListener ||
+        aIID.equals(Ci.nsISupports)))
+      return this;
+
+    throw Cr.NS_ERROR_NO_INTERFACE;
+  },
+
+
+  //**************************************************************************//
+  // nsIObserver
+
+  observe: function (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: function(aEvent) {
+    if (aEvent.type == "unload") {
+      this.destroy();
+    }
+  },
+
+
+  //**************************************************************************//
+  // Composed Model Construction
+
+  _loadData: function() {
+    this._loadFeedHandler();
+    this._loadPluginHandlers();
+    this._loadApplicationHandlers();
+  },
+
+  _loadFeedHandler: function() {
+    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 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.
+   * 
+   * I'll also note that my reading of nsPluginTag::RegisterWithCategoryManager
+   * suggests that enabledPlugin is only determined during registration
+   * and does not get updated when plugin.disable_full_page_plugin_for_types
+   * changes (unless modification of that preference spawns reregistration).
+   * 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: function() {
+    for (let i = 0; i < navigator.plugins.length; ++i) {
+      let plugin = navigator.plugins[i];
+      for (let j = 0; j < plugin.length; ++j) {
+        let type = plugin[j].type;
+
+        let handlerInfoWrapper;
+        if (type in this._handledTypes)
+          handlerInfoWrapper = this._handledTypes[type];
+        else {
+          let wrappedHandlerInfo =
+            this._mimeSvc.getFromTypeAndExtension(type, null);
+          handlerInfoWrapper = new HandlerInfoWrapper(type, wrappedHandlerInfo);
+          handlerInfoWrapper.handledOnlyByPlugin = true;
+          this._handledTypes[type] = handlerInfoWrapper;
+        }
+
+        handlerInfoWrapper.plugin = plugin;
+      }
+    }
+  },
+
+  /**
+   * Load the set of handlers defined by the application datastore.
+   */
+  _loadApplicationHandlers: function() {
+    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: function() {
+    // 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: function() {
+    // 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 each (let visibleType in 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: function(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: function(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: function(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]);
+      else
+        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]);
+
+        // 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.plugin.name,
+                                                     this._brandShortName]);
+    }
+  },
+
+  _selectLastSelectedType: function() {
+    // 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: function(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: function(aExecutable) {
+    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
+#ifdef XP_WIN
+#expand    aExecutable.leafName != "__MOZ_APP_NAME__.exe";
+#else
+#ifdef XP_MACOSX
+#expand    aExecutable.leafName != "__MOZ_MACBUNDLE_NAME__";
+#else
+#expand    aExecutable.leafName != "__MOZ_APP_NAME__-bin";
+#endif
+#endif
+  },
+
+  /**
+   * Rebuild the actions menu for the selected entry.  Gets called by
+   * the richlistitem constructor when an entry in the list gets selected.
+   */
+  rebuildActionsMenu: function() {
+    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);
+
+    {
+      var askMenuItem = document.createElement("menuitem");
+      askMenuItem.setAttribute("alwaysAsk", "true");
+      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)) {
+      var 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 menuItem = document.createElement("menuseparator");
+    menuPopup.appendChild(menuItem);
+
+    // 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.plugin) {
+      var pluginMenuItem = document.createElement("menuitem");
+      pluginMenuItem.setAttribute("action", kActionUsePlugin);
+      let label = this._prefsBundle.getFormattedString("usePluginIn",
+                                                       [handlerInfo.plugin.name,
+                                                        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.
+#ifdef XP_WIN
+    // On Windows, selecting an application to open another application
+    // would be meaningless so we special case executables.
+    var executableType = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService)
+                                                  .getTypeFromExtension("exe");
+    if (handlerInfo.type != executableType)
+#endif
+    {
+      let menuItem = document.createElement("menuitem");
+      menuItem.setAttribute("oncommand", "gApplicationsPane.chooseApp(event)");
+      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.setAttribute("oncommand", "gApplicationsPane.manageApp(event)");
+      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:
+        menu.selectedItem = internalMenuItem;
+        break;
+      case Ci.nsIHandlerInfo.useSystemDefault:
+        menu.selectedItem = defaultMenuItem;
+        break;
+      case Ci.nsIHandlerInfo.useHelperApp:
+        if (preferredApp)
+          menu.selectedItem = 
+            possibleAppMenuItems.filter(function(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: function (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: function() {
+    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: function() {
+    this._rebuildView();
+  },
+
+  focusFilterBox: function() {
+    this._filter.focus();
+    this._filter.select();
+  },
+
+
+  //**************************************************************************//
+  // Changes
+
+  onSelectAction: function(aActionItem) {
+    this._storingAction = true;
+
+    try {
+      this._storeAction(aActionItem);
+    }
+    finally {
+      this._storingAction = false;
+    }
+  },
+
+  _storeAction: function(aActionItem) {
+    var typeItem = this._list.selectedItem;
+    var handlerInfo = this._handledTypes[typeItem.type];
+
+    if (aActionItem.hasAttribute("alwaysAsk")) {
+      handlerInfo.alwaysAskBeforeHandling = true;
+    }
+    else if (aActionItem.hasAttribute("action")) {
+      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.plugin && !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.
+      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: function(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];
+
+    document.documentElement.openSubDialog("chrome://browser/content/preferences/applicationManager.xul",
+                                           "", handlerInfo);
+
+    // 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));
+    }
+  },
+
+  chooseApp: function(aEvent) {
+    // Don't let the normal "on select action" handler get this event,
+    // as we handle it specially ourselves.
+    aEvent.stopPropagation();
+
+    var handlerApp;
+
+#ifdef XP_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;
+
+    window.openDialog("chrome://global/content/appPicker.xul", null,
+                      "chrome,modal,centerscreen,titlebar,dialog=yes",
+                      params);
+
+    if (this.isValidHandlerApp(params.handlerApp)) {
+      handlerApp = params.handlerApp;
+
+      // Add the app to the type's list of possible handlers.
+      handlerInfo.addPossibleApplicationHandler(handlerApp);
+    }
+#else
+    var fp = Cc["@mozilla.org/filepicker;1"].createInstance(Ci.nsIFilePicker);
+    var winTitle = this._prefsBundle.getString("fpTitleChooseApp");
+    fp.init(window, winTitle, Ci.nsIFilePicker.modeOpen);
+    fp.appendFilters(Ci.nsIFilePicker.filterApps);
+
+    // 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.
+    if (fp.show() == 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 handlerInfo = this._handledTypes[this._list.selectedItem.type];
+      handlerInfo.addPossibleApplicationHandler(handlerApp);
+    }
+#endif
+
+    // 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 (handlerApp) {
+      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(handlerApp)) {
+          actionsMenu.selectedIndex = i;
+          this.onSelectAction(menuItem);
+          break;
+        }
+      }
+    }
+  },
+
+  // 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: function() {
+    if (this._list.selectedItem)
+      this._list.setAttribute("lastSelectedType",
+                              this._list.selectedItem.getAttribute("type"));
+  },
+
+  _setIconClassForPreferredAction: function(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;
+        }
+        break;
+
+      case kActionUsePlugin:
+        aElement.setAttribute(APP_ICON_ATTR_NAME, "plugin");
+        return true;
+    }
+    aElement.removeAttribute(APP_ICON_ATTR_NAME);
+    return false;
+  },
+
+  _getIconURLForPreferredAction: function(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);
+        }
+        break;
+
+      // 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: function(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: function(aFile) {
+    var fph = this._ioSvc.getProtocolHandler("file").
+              QueryInterface(Ci.nsIFileProtocolHandler);
+    var urlSpec = fph.getURLSpecFromFile(aFile);
+
+    return "moz-icon://" + urlSpec + "?size=16";
+  },
+
+  _getIconURLForWebApp: function(aWebAppURITemplate) {
+    var uri = this._ioSvc.newURI(aWebAppURITemplate, null, null);
+
+    // 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: function(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;
+  }
+
+};
new file mode 100644
--- /dev/null
+++ b/browser/components/preferences/in-content/applications.xul
@@ -0,0 +1,88 @@
+<!-- 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/.  -->
+
+<script type="application/javascript"
+        src="chrome://browser/content/preferences/in-content/applications.js"/>
+
+<preferences id="feedsPreferences">
+  <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>
+  <key key="&focusSearch1.key;" modifiers="accel" oncommand="gApplicationsPane.focusFilterBox();"/>
+  <key key="&focusSearch2.key;" modifiers="accel" oncommand="gApplicationsPane.focusFilterBox();"/>
+</keyset>
+
+<hbox class="heading" data-category="paneApplications" hidden="true">
+  <image class="preference-icon" type="applications"/>
+  <html:h1>&paneApplications.title;</html:h1>
+</hbox>
+
+<vbox data-category="paneApplications" hidden="true" flex="1">
+  <hbox>
+    <textbox id="filter" flex="1"
+             type="search"
+             placeholder="&filter.emptytext;"
+             aria-controls="handlersView"
+             oncommand="gApplicationsPane.filter();"/>
+  </hbox>
+
+  <separator class="thin"/>
+
+  <richlistbox id="handlersView" orient="vertical" persist="lastSelectedType"
+               preference="pref.downloads.disable_button.edit_actions"
+               flex="1"
+               onselect="gApplicationsPane.onSelectionChanged();">
+    <listheader equalsize="always" style="border: 0; padding: 0; -moz-appearance: none;">
+        <treecol id="typeColumn" label="&typeColumn.label;" value="type"
+                 accesskey="&typeColumn.accesskey;" persist="sortDirection"
+                 flex="1" onclick="gApplicationsPane.sort(event);"
+                 sortDirection="ascending"/>
+        <treecol id="actionColumn" label="&actionColumn2.label;" value="action"
+                 accesskey="&actionColumn2.accesskey;" persist="sortDirection"
+                 flex="1" onclick="gApplicationsPane.sort(event);"/>
+    </listheader>
+  </richlistbox>
+</vbox>
--- a/browser/components/preferences/in-content/jar.mn
+++ b/browser/components/preferences/in-content/jar.mn
@@ -4,9 +4,11 @@ browser.jar:
 *  content/browser/preferences/in-content/preferences.xul
 *  content/browser/preferences/in-content/main.xul
    content/browser/preferences/in-content/main.js
 *  content/browser/preferences/in-content/tabs.xul
 *  content/browser/preferences/in-content/tabs.js
    content/browser/preferences/in-content/privacy.xul
    content/browser/preferences/in-content/privacy.js
 *  content/browser/preferences/in-content/advanced.xul
-*  content/browser/preferences/in-content/advanced.js
\ No newline at end of file
+*  content/browser/preferences/in-content/advanced.js
+*  content/browser/preferences/in-content/applications.xul
+*  content/browser/preferences/in-content/applications.js
\ No newline at end of file
--- a/browser/components/preferences/in-content/preferences.js
+++ b/browser/components/preferences/in-content/preferences.js
@@ -18,16 +18,17 @@ function init_all() {
   window.addEventListener("popstate", onStatePopped, true);
   updateCommands();
   gMainPane.init();
 #ifdef XP_WIN
   gTabsPane.init();
 #endif
   gPrivacyPane.init();
   gAdvancedPane.init();
+  gApplicationsPane.init();
   var initFinished = document.createEvent("Event");
   initFinished.initEvent("Initialized", true, true);
   document.dispatchEvent(initFinished);
 }
 
 function gotoPref(page) {
   search(page, "data-category");
   window.history.pushState(page, document.title);
--- a/browser/components/preferences/in-content/preferences.xul
+++ b/browser/components/preferences/in-content/preferences.xul
@@ -89,12 +89,13 @@
   
   <hbox class="main-content" flex="1">
     <prefpane flex="1" id="mainPrefPane">
 #include landing.xul
 #include main.xul
 #include tabs.xul
 #include privacy.xul
 #include advanced.xul
+#include applications.xul
     </prefpane>
   </hbox>
   
 </page>
--- a/browser/themes/gnomestripe/preferences/in-content/preferences.css
+++ b/browser/themes/gnomestripe/preferences/in-content/preferences.css
@@ -95,16 +95,28 @@ caption {
   margin-bottom: 15px;
   -moz-box-align: center;
 }
 
 prefpane > .content-box {
   overflow: auto;
 }
 
+/* Applications Pane Styles */
+
+#applications-content {
+  padding: 15px;
+}
+
+#handlersView {
+  -moz-appearance: none;
+  border: 1px solid ThreeDShadow;
+  overflow-y: auto;
+}
+
 /* XXX This style is for bug 740213 and should be removed once that
    bug has a solution. */
 description > html|a {
   cursor: pointer;
 }
 
 /* XXX Styles Below can be removed once bug 660726 lands */
 .nav-button {
--- a/browser/themes/pinstripe/preferences/in-content/preferences.css
+++ b/browser/themes/pinstripe/preferences/in-content/preferences.css
@@ -98,16 +98,28 @@ caption {
   margin-bottom: 15px;
   -moz-box-align: center;
 }
 
 prefpane > .content-box {
   overflow: auto;
 }
 
+/* Applications Pane Styles */
+
+#applications-content {
+  padding: 15px;
+}
+
+#handlersView {
+  -moz-appearance: none;
+  border: 1px solid rgba(60,73,97,0.5);
+  overflow-y: auto;
+}
+
 /* XXX This style is for bug 740213 and should be removed once that
    bug has a solution. */
 description > html|a {
   cursor: pointer;
 }
 
 /* XXX Styles Below can be removed once bug 660726 lands */
 .nav-button {
--- a/browser/themes/winstripe/preferences/in-content/preferences.css
+++ b/browser/themes/winstripe/preferences/in-content/preferences.css
@@ -98,16 +98,28 @@ caption {
   margin-bottom: 15px;
   -moz-box-align: center;
 }
 
 prefpane > .content-box {
   overflow: auto;
 }
 
+/* Applications Pane Styles */
+
+#applications-content {
+  padding: 15px;
+}
+
+#handlersView {
+  -moz-appearance: none;
+  border: 1px solid rgba(31,64,100,0.4);
+  overflow-y: auto;
+}
+
 /* XXX This style is for bug 740213 and should be removed once that
    bug has a solution. */
 description > html|a {
   cursor: pointer;
 }
 
 /* XXX Styles Below can be removed once bug 660726 lands */
 .nav-button {