[jcortes]

sounds like a plugin issue try this link

http://kb.mozillazine.org/Standard_d..._%28Firefox%29

and does the error look like this appart from the theme ?

[kpmwrestler]

If you uninstall firefox and reinstall it, it will be just as you left it. That means you have to do some serious uninstalling. Firefox is pretty hard to uninstall. I had to uninstall firefox before. You have to do a search on your hard drive for "moz" and delete everything that has anything to do with mozilla. Then go to start-run- and type regedit.
Then delete hkey_current user-software-mozilla

delete hkey_local machine-software mozilla
delete hkey_local machine-software MozillaPlugins
delete hkey_local machine-software mozilla.org

Then restart and then install firefox

[tman114]

it says "shockwave has performed an illegal operation" if that helps

[jcortes]

ya thats a flash error thats been a reported bug on firefox in some systems try uninstalling flash see if it works then and if it does try reinstalling it again and see if that helps.

[tman114]

i have uninstalled it like 4 times it does the same thing over and over

[jcortes]

but it does work with flash uninstalled?

[kpmwrestler]

You might want to also uninstall all of the plugins then reinstall them once firefox is working again.