Try the patch available here:
https://bugs.freedesktop.org/show_bug.cgi?id=19643
I had rebuild package xserver-xorg-core with this patch, but there is no
effect. After 30 minutes of work new crash happened.
I found out that this problem is not with Firefox (Iceweasel). I watched
the crash including when firefox was not running.
If I do not find solutions in the near future I will be compelled to
migrate to another distro, because I lose data on each crash.
Best regards, Grigory Koshcheev
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