It seems that the graphic card was too hot. I just changed the cool air
flow and the bug disappeared.
** Changed in: xorg (Ubuntu)
Status: New => Invalid
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firefox crashes (sometimes X too)
https://bugs.launchpad.net/bugs/379691
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Thanks for taking the time to report this bug and helping to make Ubuntu
better. We appreciate the difficulties you are facing, but this appears
to be a "regular" (non-security) bug. I have unmarked it as a security
issue since this bug does not show evidence of allowing attackers to
cross privile