Menu of Firefox displaying incorrectly

The menu seems to have a strange white box in the corner, see screenshot. I reinstalled firefox, nothing helps.

Running Windows 7, firefox RC1 however had this problem in version beta.

http://i.imgur.com/sDePb.jpg

This is probably caused by a problem with an add-on. Follow the procedure described in the following article to identify what is the cause - https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

Tags: Firefox

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