I believe I've reproduced this bug here.  Steps to reproduce:

 - load something javascripty that angers firefox and makes it very, very laggy
 - watch compiz notice this lagginess and helpfully animate the window as 
non-responsive (shading), making everything even more laggy
 - switch workspaces
 - watch your control go away

This time, I was able to remotely kill firefox and recover control of
the system.

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https://bugs.launchpad.net/bugs/1117563

Title:
  X hard lockup in raring, can't even switch VTs

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