Firefox 3.5pre + FireBug 1.5X.0a03 = full support

A number of errors were fixed with the release of Firefox 3.5pre, in particular, this error, which does not allow tracking asynchronous requests to the server. It is also worth noting that the new version of Firebug supports all FBTests unit tests, which before that correctly run only on Firefox 3.0.10.
Download Firefox 3.5pre (EN, win32) + install FireBug 1.5X.0a03 .