diff -r 000000000000 -r 6474c204b198 toolkit/components/downloads/nsIDownloadManagerUI.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/downloads/nsIDownloadManagerUI.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,55 @@
+/* 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/. */
+
+#include "nsISupports.idl"
+interface nsIInterfaceRequestor;
+interface nsIDownload;
+
+[scriptable, uuid(0c76d4cf-0b06-4c1a-9bea-520c7bbdba99)]
+interface nsIDownloadManagerUI : nsISupports {
+  /**
+   * The reason that should be passed when the user requests to show the
+   * download manager's UI.
+   */
+  const short REASON_USER_INTERACTED = 0;
+
+  /**
+   * The reason that should be passed to the show method when we are displaying
+   * the UI because a new download is being added to it.
+   */
+  const short REASON_NEW_DOWNLOAD = 1;
+
+ /**
+  * Shows the Download Manager's UI to the user.
+  *
+  * @param [optional] aWindowContext
+  *        The parent window context to show the UI.
+  * @param [optional] aDownload
+  *        The download to be preselected upon opening.
+  * @param [optional] aReason
+  *        The reason to show the download manager's UI.  This defaults to
+  *        REASON_USER_INTERACTED, and should be one of the previously listed
+  *        constants.
+  * @param [optional] aUsePrivateUI
+  *        Pass true as this argument to hint to the implementation that it
+  *        should only display private downloads in the UI, if possible.
+  */
+  void show([optional] in nsIInterfaceRequestor aWindowContext,
+            [optional] in nsIDownload aDownload,
+            [optional] in short aReason,
+            [optional] in boolean aUsePrivateUI);
+
+ /**
+  * Indicates if the UI is visible or not.
+  */
+  readonly attribute boolean visible;
+
+ /**
+  * Brings attention to the UI if it is already visible
+  *
+  * @throws NS_ERROR_UNEXPECTED if the UI is not visible.
+  */
+  void getAttention();
+};
+