diff -r 000000000000 -r 6474c204b198 toolkit/components/perf/PerfMeasurement.jsm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/perf/PerfMeasurement.jsm	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+/* -*-  Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
+/* 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.EXPORTED_SYMBOLS = [ "PerfMeasurement" ];
+
+/*
+ * This is the js module for jsperf. Import it like so:
+ *   Components.utils.import("resource://gre/modules/PerfMeasurement.jsm");
+ *
+ * This will create a 'PerfMeasurement' class.  Instances of this class can
+ * be used to benchmark browser operations.
+ *
+ * For documentation on the API, see js/src/perf/jsperf.h.
+ *
+ */
+
+Components.classes["@mozilla.org/jsperf;1"].createInstance()();