hello raliy2k, some other users who have recently updated the graphics driver for their ati hardware (to ati catalyst version 12.8) have reported similar crashes. please try disabling hardware acceleration in firefox > options > advanced > general & see if this resolves the issue of frequent crashes for the moment until ati releases a new driver.

Thank you for your help, this has resolved the problem. Although I do get a little problem playing videos. Would it be better to roll back my graphics driver?