Intensive processing = heat, especially if the house is being kept warm atm. Try cleaning your fans & cooling fins. Costs nothing & at worst eliminates overheating as the cause.
In general FF builds from about ~6-mos ago seem crashy on both xp, and multiple linux distros for me (though not causing BSDs or anything like that). Seems to correlate to javascripts. I switched to Chrome because of it.
Bloody thing did it again. Running memtest now, but apparently I'm meant to only have one stick in at a time to test them properly? Is there any point in letting it run with both sticks in or should I cancel it and restart?