I have too many problems to list with FF4, needed to revert to FF3.6
The search fails to offer predictive selection. Fails to offer return to previous search subject. Fails to return to the previous page Does not offer autofill, though on 1 occasion it did offer a line by line infill
Now returned to FF 3.6
Wšykne wótegrona (2)
Uninstalling and reinstalling the Google Toolbar extension usually fixes problems with the Google Toolbar extension's Search functions acting quirky or not working at all. I haven't had that problem with the GTB, but I created new Profiles for Firefox 4.0 instead of using the 3.6 Profiles (because I am still using Firefox 3.6.x for a lot of the day).
As much as appreciate the solution of "the-edmeister", I think I will stay with FF 3.6 and monitor other peoples problems, hoping they will settle down eventually.
It would appear that FF4 has been released too soon and not given an adequate field trial.