I do have this bug also since some time (ok, some months, maybe over a year). 
Recently I stumble upon Bug#926906 and Bug#712584, both on Firefox accessing 
the grafix card and AppArmor blocking the access. Since all my crashed seemed 
to be preceded by a ratelimit and some audit denies (like the poster above 
stated) I reasoned, if the bugs are connected in some weird way, lets say 
AppArmor block firefox from accessing /dev/ati/card0 and the overflow on 
ratelimit crashes the system ?
At least I now adapted my firefox apparmor profile and gave it access to 
/dev/ati/card0. The audit messages are gone and so is the ratelimit msg. I'll 
watch the situation and post back, if my crashes are gone.

For NVidia the bug was fixed with a new abstraction for apparmor.

Links to the bugs
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/926906
https://bugs.launchpad.net/ubuntu/+source/apparmor/+bug/712584

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https://bugs.launchpad.net/bugs/938981

Title:
  Xorg freeze when starting Firefox

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