Comment 137 for bug 204996

I'm running the following:
AMD Athlon 64 3800+ CPU
2 SATA hard drives - one 160Mb with XP, the other 500Mb with Linux including Ubuntu Hardy Heron 64 bit.
Nvidia Geoforce 7600 with restricted drivers.
Belkin wireless card based on Broadcomm BCM 4308 using restricted drivers.
Yesterday I had 7 times when the PC locked up solid while running Firefox 3. The PC would not allow me to reboot, restart X or recover after waiting some time. The only way to continue was a hard reset via the PC front panel switch. All times I was running BOINC, Screenlets and Compiz in the background.
I've temporarily downgraded Firefox to 2.0.0.14 and now do not have any lockups with all other background tasks running.
In my case I believe that the lockups are due to either Firefox 3 or a Mozilla plug-in for in-browser video playing. Every time the lockup occurred I was trying to watch video on the BBC news website (http://news.bbc.co.uk) and the fault occurred almost immediately after the stream started to download.
 Unfortunately due to other issues I'm shortly going to re-install Gutsy.