Well its a new one on me. I think you just need to clean the cache and history. If that doean't improve things then export the bookmarks, make a note of add ons that you use. Uninstall completely and reinstall.
OS: Windows 7 64-bit Case: Commander MS-I
Mother Board: GA-880GM-UD2H CPU: AMD PhenomII X4 965 3.4GHz(Stock) RAM: 16GB GPU: GeForce GTX 550 Ti