diff -r 000000000000 -r 6474c204b198 testing/mochitest/mochitest-e10s-utils-content.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing/mochitest/mochitest-e10s-utils-content.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+// This is the content script for mochitest-e10s-utils
+
+// We hook up some events and forward them back to the parent for the tests
+// This is only a partial solution to tests using these events - tests which
+// check, eg, event.target is the content window are still likely to be
+// confused.
+// But it's a good start...
+["load", "DOMContentLoaded", "pageshow"].forEach(eventName => {
+  addEventListener(eventName, function eventHandler(event) {
+    // Some tests also rely on load events from, eg, iframes, so we should see
+    // if we can do something sane to support that too.
+    if (event.target == content.document) {
+      sendAsyncMessage("Test:Event", {name: event.type});
+    }
+  }, true);
+});