diff -r 000000000000 -r 6474c204b198 toolkit/components/crashmonitor/test/unit/test_register.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/components/crashmonitor/test/unit/test_register.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,24 @@
+/* -*- Mode: js; 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/. */
+
+/**
+ * Test that CrashMonitor.jsm is correctly loaded from XPCOM component
+ */
+add_task(function test_register() {
+  let cm = Components.classes["@mozilla.org/toolkit/crashmonitor;1"]
+                             .createInstance(Components.interfaces.nsIObserver);
+
+  // Send "profile-after-change" to trigger the initialization
+  cm.observe(null, "profile-after-change", null);
+
+  // If CrashMonitor was initialized properly a new call to |init|
+  // should fail
+  try {
+    CrashMonitor.init();
+    do_check_true(false);
+  } catch (ex) {
+    do_check_true(true);
+  }
+});