I've got some problem with firefox 3. It's now on rc3 but I already had it sometimes with the other rc/beta's, when it crashes (such as infinite loop or flash animation) it's impossible to kill the firefox process in the task manager or with sysinternals process-explorer.
It is really really annoying to have to reboot my entire computer just to restart firefox !
When I try to kill it, it just tells me : unauthorized access........
It seams that deep monitor can kill it, but it is frustrating to have to resort to a third party utility just to be able to use correctly one of my favorite applications.