diff -r 000000000000 -r 6474c204b198 toolkit/crashreporter/test/unit/test_override_exception_handler.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/crashreporter/test/unit/test_override_exception_handler.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+function run_test()
+{
+  // Ensure that attempting to override the exception handler doesn't cause
+  // us to lose our exception handler.
+  do_crash(
+    function() {
+        CrashTestUtils.TryOverrideExceptionHandler();
+    },
+    function(mdump, extra) {
+    },
+    true);
+}