Firefox 3 beta 4 is just out, but unfortunately its DOM parser seems to be affected by a strange bug. Among other things, this prevents the LiveRC tool on the French Wikipedia from functioning.

I filed the bug yesterday, but there has been no activity on it yet. If you are using Firefox 3 beta 4, can you please try my testcases and confirm (or report as WFM) bug #422735? It may help attract Mozillans' attention on what I deem a serious defect.