Try 'uninstalling' and then 'install' the newest version of Firefox. I think they have 9.3 out now. I just checked mine and it is working fine. I updated my version 2wks ago. good luck.
It's 0.9.3 and I dont think Firefox is so great that I'm going to reinstall it on the off chance it fixes the bugs in it. The way it brings you back to the top of a page when using the back button is also a major drawback.