Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).

• Don't make any changes on the Safe mode start window.
• https://support.mozilla.org/kb/Safe+Mode

• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

See also

• http://kb.mozillazine.org/Corrupt_localstore.rdf

I am on the default theme. Like i said when i restart firefox it fixes itself.. but what caused it to happen is the real question?

It just happened again! This is getting annoying!

UPDATE: I just removed the app button to show the menu bar and the menu bar is disabled.. i try to click help and it umm doesn't let me click on anything.. i wonder if firefox 12 will fix this problem..

Create a new profile as a test to check if your current profile is causing the problems.

See "Basic Troubleshooting: Make a new profile":

• https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile

There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.

If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.

See:

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

You can also try to uninstall and reinstall Firefox.