I finally managed to catch this bug in debugger. After I closed Firefox
window there were two threads consuming CPU so I printed their
stacktraces. I won't stop process for one day so someone could gather
more information by writing me commands to run. (I'm using Firefox 28)

** Attachment added: "firefox-log.txt"
   
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1266509/+attachment/4033911/+files/firefox-log.txt

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https://bugs.launchpad.net/bugs/1266509

Title:
  Firefox takes all available CPU power occasionally, and can't quit

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