diff -r 000000000000 -r 6474c204b198 chrome/test/unit/head_crtestutils.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/chrome/test/unit/head_crtestutils.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+const XULAPPINFO_CONTRACTID = "@mozilla.org/xre/app-info;1";
+const XULAPPINFO_CID = Components.ID("{4ba645d3-be6f-40d6-a42a-01b2f40091b8}");
+
+const Cc = Components.classes;
+const Ci = Components.interfaces;
+const Cr = Components.results;
+
+
+function registerManifests(manifests)
+{
+  var reg = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
+  for each (var manifest in manifests)
+    reg.autoRegister(manifest);
+}