Updated to new version of firefox today, v. 18, and have had glitched out menus since. Is there a way to fix this?

I updated today to v. 18, and while my menus do pull down (for both the firefox one of the left and the bookmark one on the right) and the links work, the... image file, I guess, is very glitchy. I only know what I'm clicking on because I know vaguely where things are in the lists.

I have updated Java (which has now disappeared from my plug ins list), put firefox into safe mode and then activated one extension at a time to check them, and restarted both my laptop and firefox a few times. While in safe mode this glitch does not occur.

Is there any way to correct this? I have screencaps I can provide showing exactly what is happening:

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