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I've upgraded to Firefox 4. Prior toolbars and add-ons are now missing or truncated. Suggestions already published in Forum have not worked. What has happened?

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Google toolbar blank. Cannot enable add-ons. Yahoo toolbar is now search only. Cannot add buttons. Tried safe-mode, etc.

Google toolbar blank. Cannot enable add-ons. Yahoo toolbar is now search only. Cannot add buttons. Tried safe-mode, etc.

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Try a new Profile.
http://kb.mozillazine.org/Creating_a_new_Firefox_profile_on_Windows

http://support.mozilla.com/en-US/kb/Recovering+important+data+from+an+old+profile

Your old Profile is located here in Vista & Win7:
drive:\Users\Windows login user name\AppData\Roaming\Mozilla\Firefox\Profiles\profile_name