diff -r 000000000000 -r 6474c204b198 dom/activities/src/ActivityMessageConfigurator.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/activities/src/ActivityMessageConfigurator.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,33 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const Ci = Components.interfaces;
+const Cu = Components.utils;
+
+Cu.import("resource://gre/modules/XPCOMUtils.jsm");
+
+function debug(aMsg) {
+  // dump("-- ActivityMessageConfigurator.js " + Date.now() + " : " + aMsg + "\n");
+}
+
+/**
+  * nsISystemMessagesConfigurator implementation.
+  */
+function ActivityMessageConfigurator() {
+  debug("ActivityMessageConfigurator");
+}
+
+ActivityMessageConfigurator.prototype = {
+  get mustShowRunningApp() {
+    debug("mustShowRunningApp returning true");
+    return true;
+  },
+
+  classID: Components.ID("{d2296daa-c406-4c5e-b698-e5f2c1715798}"),
+  QueryInterface: XPCOMUtils.generateQI([Ci.nsISystemMessagesConfigurator])
+}
+
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory([ActivityMessageConfigurator]);