Same problem. Started to happen after the (automatic) upgrade to firefox 10, in
my case on February 14.
As the OP, crashes sometimes manifest as Xorg restarts, other times system
freezes completely, showing a black rectangle on top left of the screen. It is
deterministic: it always the third time I open Firefox (tabs do not count)
firefox is 10.0.2+build1-0ubuntu0.10.04.1
fglrx is 2:8.930-0ubuntu1 (package build from ati installer)
ubuntu is 10.04 (32bits)
ATI Radeon HD5450 graphics card
I use 3D design tools like Blender with no problem.
kern.log is full of entries like:
Mar 6 10:12:53 titan kernel: [ 176.203479] type=1503
audit(1331039573.125:34): operation="open" pid=3013 parent=3011
profile="/usr/lib/firefox-10.0.2/firefox{,*[^s][^h]}"
requested_mask="::rw" denied_mask="::rw" fsuid=1000 ouid=0
name="/dev/ati/card0"
and
Mar 6 11:35:17 titan kernel: [ 5120.649544] type=1503
audit(1331044517.573:210): operation="open" pid=3011 parent=1
profile="/usr/lib/firefox-10.0.2/firefox{,*[^s][^h]}"
requested_mask="r::" denied_mask="r::" fsuid=1000 ouid=1000
name="/proc/3011/smaps"
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https://bugs.launchpad.net/bugs/938981
Title:
Xorg freeze when starting Firefox
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