This thread was archived. Please ask a new question if you need help.
Since upgrading to 4.0, my iMac restarts if I get up and walk away for 15 or 20 minutes.
I'm not sure if this is a computer problem or a Firefox problem. It may just be a coincidence but, immediately after upgrading to 4.0, my computer started rebooting if I walk away for a short while. If I shut off my bluet00th mouse and put the computer to sleep, that does not happen.