I can't kill firefox ! (3rc3 - WinXP)

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.
 
sad I’m frustrated
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