User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.15pre) Gecko/20080606 Firefox/2.0.0.7 lolifox/0.3.6 BonEcho/2.0.0.15pre Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.15pre) Gecko/20080606 BonEcho/2.0.0.15pre XMLHttpRequest is broken for all sites, that use it. Didn't find a single working one, so i assume it's not them that are doing things wrong. Reproducible: Always Steps to Reproduce: 1. Open any site that uses AJAX like: - gmail (goes as far as freezing the browser) - google.com/ig (notice the rss-feeds) - demos.mootools.net/Ajax Actual Results: XMLHttpRequest.Open() fails with: [Exception... "'Permission denied to call method XMLHttpRequest.open' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x8057001e (NS_ERROR_XPC_JS_THREW_STRING)" location: "<unknown>" data: no] or similar (shorter) error-message or in case of gmail freezing the whole browser. Expected Results: XMLHttpRequest working as intended again.

Confirming based on other comments and marking as blocking 1.8.1.15.

This was fixed by the back-out of bug 418996. Should be verified before we ship because we still want to re-land that one

This has been verified with Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US; rv:1.8.1.15pre) Gecko/2008061004 BonEcho/2.0.0.15pre.