I can not open my Firefox 4.

Every time I try to open Firefox 4 separate windows pops up with the message:
" JavaScript application . what happened: TypeError: Components.classes['@mozilla.org/extensions/manager;1'] is undefined."
I have to click OK and only than my browser opens up. Does any one knows how to get rid of this message?

It may be because you appear to be running a BETA version of Firefox. Try using the Help | Updates route to update to the full release first. You can also download the full release from here: [http://www.mozilla.com/en-US/firefox/fx/?ref=logo Download Firefox 4.0]
You can downgrade at any time by downloading v3.6.16 from here: [http://www.mozilla.com/en-US/firefox/all-older.html Download Firefox v3.6.16]
Then go to Add/Remove programs and uninstall the current version, but choose to keep your bookmarks, customizations etc. Finally, reboot and then run the installation file you downloaded.

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