is there any intention to implement cross site http requests -
https://developer.mozilla.org/En/HTTP_access_control also known as cross origin resource sharing -
http://www.w3.org/TR/cors/ in a similar manner that "flash crossdomain policies" have been?
It would make creating a web ui in firefox easier without the potentially risky elevation of privileges - eg netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserWrite");
It would also allow a web UI to be written for google chrome, not sure about other browsers like opera etc - the example testui currently only works for firefox and IE