A blank square appears at the top left corner of my screen after close the preferences window in Mac OS X

Whenever I open the preferences window and close, a blank square of 120px (aprox) appears at the top left corner of the screen. The square doesn't dissapear untill I exit from Firefox and reopen it.
[http://cl.ly/5DCr Screenshot] Screenshot

Can you go to Help > Troubleshooting information and copy and paste everything here?
This is a [https://bugzilla.mozilla.org/show_bug.cgi?id=641288 known bug] but we need more information on it.

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