i just updated firefox to the newest version(2.0.0.12) and all of my add ons and themes have stopped working. i updated my other computer last night to the new version and everything worked fine but now i cant get anything to work on this computer. i tried reinstalling the add ons but that didnt work.
It sounds like he update might have messed up. Try uninstalling firefox and then downloading the full version from mozilla.com. After you install it, try loading a few add-ons and see if they work properly.