Thanks for your bugreport.
This might be http://bugs.freedesktop.org/show_bug.cgi?id=15424
Please let us know (with ccsm) which of the following plugins you have
loaded: animation/cube/3d
** Changed in: compiz (Ubuntu)
Status: New => Incomplete
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compiz stuck at 100% cpu when firefox pop-up appears
https://bugs.launchpad.net/bugs/218726
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