diff -r 000000000000 -r 6474c204b198 toolkit/xre/nsQAppInstance.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/xre/nsQAppInstance.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,31 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 et sw=2 tw=80: */
+/* 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 "nsQAppInstance.h"
+#include <QGuiApplication>
+#include "prenv.h"
+#include "nsXPCOMPrivate.h"
+#include <stdlib.h>
+
+QGuiApplication *nsQAppInstance::sQAppInstance = nullptr;
+int nsQAppInstance::sQAppRefCount = 0;
+
+void nsQAppInstance::AddRef(int& aArgc, char** aArgv, bool aDefaultProcess) {
+  if (qApp)
+    return;
+  if (!sQAppInstance) {
+    mozilla::SetICUMemoryFunctions();
+    sQAppInstance = new QGuiApplication(aArgc, aArgv);
+  }
+  sQAppRefCount++;
+}
+
+void nsQAppInstance::Release(void) {
+  if (sQAppInstance && !--sQAppRefCount) {
+    delete sQAppInstance;
+    sQAppInstance = nullptr;
+  }
+}