Try turning off Hardware acceleration, does that help ? No clear ideas myself, although someone else may have. If that is the usual crash signature it is not a common one. You could try posting a few more, by pasting into your next post in case they offer other clues. I do notice the crashing threads was pointing at your f:\ drive and also I note in your modules most are dated but one is not ''Nv3DVStreaming.dll'' and I assume it is related to your graphics. (Not sure whether or not it is genuine or what version). Is Firefox only crashing when the f:\ drive is in use ?