Right now it doesn't use reftest-wait, so ends the test before it reloads the subframe.
Created attachment 518905 [details] [diff] [review] Patch (v1) This is kind of tricky, as the page loaded inside the iframe isn't valid, and results in an error page, which doesn't trigger the load event. I think the test intended to unload the iframe page instead of really reloading it. This patch does that.
Comment on attachment 518905 [details] [diff] [review] Patch (v1) You don't need to remove the event listener: iframe.removeEventListener("load", arguments.callee, false);