diff -r 000000000000 -r 6474c204b198 testing/mochitest/tests/browser/browser_privileges.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/mochitest/tests/browser/browser_privileges.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+function test() {
+  // simple test to confirm we have chrome privileges
+  let hasPrivileges = true;
+
+  // this will throw an exception if we are not running with privileges
+  try {
+    var prefs = Components.classes["@mozilla.org/preferences-service;1"].
+                getService(Components.interfaces.nsIPrefBranch);
+  }
+  catch (e) {
+    hasPrivileges = false;
+  }
+
+  // if we get here, we must have chrome privileges
+  ok(hasPrivileges, "running with chrome privileges");
+}