What have I done to my browser?

I think I've shot my Firefox! ::) ;D
Look at this screenshot of my desktop, look at the bar at the top of the Firefox windows, seems corrupted to me!
Any ideas how to fix without a re-install, or, is a re-install the best solution (I don't want to lose my favorites etc , which I've lost before when re-installing Firefox!)
Any help appreciated.
Paul.

Look at this screenshot of my desktop, look at the bar at the top of the Firefox windows, seems corrupted to me!
Any ideas how to fix without a re-install, or, is a re-install the best solution (I don't want to lose my favorites etc , which I've lost before when re-installing Firefox!)
Any help appreciated.
Paul.
