diff -r 000000000000 -r 6474c204b198 browser/components/downloads/src/DownloadsUI.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/downloads/src/DownloadsUI.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,128 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80 filetype=javascript: */
+/* 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/. */
+
+/**
+ * This component implements the nsIDownloadManagerUI interface and opens the
+ * Downloads view for the most recent browser window when requested.
+ */
+
+"use strict";
+
+////////////////////////////////////////////////////////////////////////////////
+//// Globals
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+const Cr = Components.results;
+
+Cu.import("resource://gre/modules/Services.jsm");
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+XPCOMUtils.defineLazyModuleGetter(this, "DownloadsCommon",
+                                  "resource:///modules/DownloadsCommon.jsm");
+XPCOMUtils.defineLazyServiceGetter(this, "gBrowserGlue",
+                                   "@mozilla.org/browser/browserglue;1",
+                                   "nsIBrowserGlue");
+XPCOMUtils.defineLazyModuleGetter(this, "RecentWindow",
+                                  "resource:///modules/RecentWindow.jsm");
+XPCOMUtils.defineLazyModuleGetter(this, "PrivateBrowsingUtils",
+                                  "resource://gre/modules/PrivateBrowsingUtils.jsm");
+
+////////////////////////////////////////////////////////////////////////////////
+//// DownloadsUI
+
+function DownloadsUI()
+{
+}
+
+DownloadsUI.prototype = {
+  classID: Components.ID("{4d99321e-d156-455b-81f7-e7aa2308134f}"),
+
+  _xpcom_factory: XPCOMUtils.generateSingletonFactory(DownloadsUI),
+
+  //////////////////////////////////////////////////////////////////////////////
+  //// nsISupports
+
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsIDownloadManagerUI]),
+
+  //////////////////////////////////////////////////////////////////////////////
+  //// nsIDownloadManagerUI
+
+  show: function DUI_show(aWindowContext, aDownload, aReason, aUsePrivateUI)
+  {
+    if (!aReason) {
+      aReason = Ci.nsIDownloadManagerUI.REASON_USER_INTERACTED;
+    }
+
+    if (aReason == Ci.nsIDownloadManagerUI.REASON_NEW_DOWNLOAD) {
+      const kMinimized = Ci.nsIDOMChromeWindow.STATE_MINIMIZED;
+      let browserWin = gBrowserGlue.getMostRecentBrowserWindow();
+
+      if (!browserWin || browserWin.windowState == kMinimized) {
+        this._showDownloadManagerUI(aWindowContext, aUsePrivateUI);
+      }
+      else {
+        // If the indicator is visible, then new download notifications are
+        // already handled by the panel service.
+        browserWin.DownloadsButton.checkIsVisible(function(isVisible) {
+          if (!isVisible) {
+            this._showDownloadManagerUI(aWindowContext, aUsePrivateUI);
+          }
+        }.bind(this));
+      }
+    } else {
+      this._showDownloadManagerUI(aWindowContext, aUsePrivateUI);
+    }
+  },
+
+  get visible() true,
+
+  getAttention: function () {},
+
+  //////////////////////////////////////////////////////////////////////////////
+  //// Private
+
+  /**
+   * Helper function that opens the download manager UI.
+   */
+  _showDownloadManagerUI: function (aWindowContext, aUsePrivateUI)
+  {
+    // If we weren't given a window context, try to find a browser window
+    // to use as our parent - and if that doesn't work, error out and give up.
+    let parentWindow = aWindowContext;
+    if (!parentWindow) {
+      parentWindow = RecentWindow.getMostRecentBrowserWindow({ private: !!aUsePrivateUI });
+      if (!parentWindow) {
+        Components.utils.reportError(
+          "Couldn't find a browser window to open the Places Downloads View " +
+          "from.");
+        return;
+      }
+    }
+
+    // If window is private then show it in a tab.
+    if (PrivateBrowsingUtils.isWindowPrivate(parentWindow)) {
+      parentWindow.openUILinkIn("about:downloads", "tab");
+      return;
+    } else {
+      let organizer = Services.wm.getMostRecentWindow("Places:Organizer");
+      if (!organizer) {
+        parentWindow.openDialog("chrome://browser/content/places/places.xul",
+                                "", "chrome,toolbar=yes,dialog=no,resizable",
+                                "Downloads");
+      } else {
+        organizer.PlacesOrganizer.selectLeftPaneQuery("Downloads");
+        organizer.focus();
+      }
+    }
+  }
+};
+
+////////////////////////////////////////////////////////////////////////////////
+//// Module
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([DownloadsUI]);