I can confirm that this is reproducible with compiz enabled.
Changing task from firefox to compiz.
No interesting message found in .xsession-errors or Xorg.0.log
Thanks for taking the time to make Ubuntu better!
** Changed in: compiz (Ubuntu)
Sourcepackagename: firefox => compiz
Status: Incomplete => Confirmed
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firefox window title goes to the right and dissapears
https://bugs.launchpad.net/bugs/149179
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