It's not so much that Firefox crashes... it is that Firefox crashes my computer. Only when I run Firefox does this happen: If I leave the computer and the screen saver comes on, then when I bring it out of screen saver and click inside my Firefox browser, BAM! Blue screen. I get the IRQL_IS_NOT_LESS_OR_EQUAL message. Something about physical memory dump. The longer I have Firefox open the more likely this crash is. The more stuff I do in Firefox (streaming music) the more likely the crash is. Interestingly, it never crashes when I am actually using the computer or when it is in screen saver mode, only when I Ieave the machine idle, then bring it out of screen saver and go back to Firefox. Firefox has always done this on this machine, at least since I first installed it almost a year ago.