Comment 2 for bug 112637

Hmm, there isn't an obvious error message in the Xorg.0.log file.

Can you run `strace firefox` in a console, run it until it crashes, and then attach the last 100 lines or so here?

Also, please tell what version of firefox you're using.

Fwiw, I've had firefox crash while using dell's website, but not Xorg. Have you looked in the firefox bug tracker to see if this is a known issue for them?