Here on rock stable Windows 7 64bit SP1 (Dutch). At 19:00 hrs (local time) today I was surfing normally when suddenly my mouse-pointer froze. Duration was a few seconds and then suddenly a complete black screen. No matter what I did, nothing happened. Only a message from my monitor that there was no signal. My PC was still on but no HDD activity or whatever. Had to do a hardware reset (first time since I have Windows 7). After a restart in Safe Mode (just to be sure), I did normal restart and all was fine again but still no clue on what happened. Did check log files and did see that at the moment of the crash FF had been updated to 6.0.1. And sure enough, when I started FF, I got the screen with info on the new build. All is fine now, was just the 1 crash. Somehow the update caused a total system crash.