diff -r 000000000000 -r 6474c204b198 browser/metro/base/tests/mochiperf/browser_firstx.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/metro/base/tests/mochiperf/browser_firstx.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,29 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+function test() {
+  runTests();
+}
+
+gTests.push({
+  desc: "first x metrics",
+  run: function run() {
+    PerfTest.declareTest("5F2A456E-2BB2-4073-A751-936F222FEAE0",
+                         "startup perf metrics", "browser", "ux",
+                         "Tracks various metrics reported by nsIAppStartup.getStartupInfo(). Values are in msec.");
+
+    let startup = Cc["@mozilla.org/toolkit/app-startup;1"].getService(Ci.nsIAppStartup).getStartupInfo();
+    PerfTest.declareNumericalResults([
+      { value: startup['start'] - startup.process, desc: "start" },
+      { value: startup['main'] - startup.process, desc: "main", shareAxis: 0 },
+      { value: startup['startupCrashDetectionBegin'] - startup.process, desc: "startupCrashDetectionBegin", shareAxis: 0 },
+      { value: startup['firstPaint'] - startup.process, desc: "firstPaint", shareAxis: 0 },
+      { value: startup['sessionRestored'] - startup.process, desc: "sessionRestored", shareAxis: 0 },
+      { value: startup['createTopLevelWindow'] - startup.process, desc: "createTopLevelWindow", shareAxis: 0 },
+      { value: startup['firstLoadURI'] - startup.process, desc: "firstLoadURI", shareAxis: 0 },
+    ]);
+  }
+});
+