Please found here more details about of this bug :
Unity freeze randomly when I am using firefox. It's always happen on particular 
website with lot of flash annimations or videos. I can't reproduce this bug, it 
is unpredictable. 
When it's happen, the mouse and the keyboard have no actions (you can still 
move the mouse but click doen't work). Notice that the sound are still playing 
! If you don't know what to do, the only solution is an hard reboot. But you 
can still press ctrl+alt+F1 to reach a shell. Then you can safetly reboot by 
this way or try to fix the problem (Kill firefox does not solve the problem, 
the only way I found is to kill compiz and restart unity, but leave to a very 
slow and unstable system). 
This bug appeared more frequently on Ubuntu 12.04 than on ubuntu 12.10. But it 
never happenned on ubuntu 11.10. 
Is threre more efficients commands to restart unity/compiz (than pkill compiz 
and unity --replace)  and to get a more usable system after ?
When it will happen again, how can I make a full/good report ? Pressing  
ctrl+alt+F1 and  running ubuntu-bug in this shell will trigger the problem ?
Thanks,

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https://bugs.launchpad.net/bugs/1171832

Title:
  Xorg freeze

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