Do you get this in the FF safemode ? http://support.mozilla.com/en-US/kb/Safe+Mode
I am able to repro this using Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1b2pre) Gecko/20081016 Minefield/3.1b2pre without any extensions. Happens on Mac as well. I see this in the error console: Error: b.inherits is not a function Source File: http://maps.google.com/?ie=UTF8&ll=37.0625,-95.677068&spn=57.42297,105.820313&z=4 Line: 215
I can corroborate that it does work fine using Firefox 3.0.3 on Mac.
Yes, I have same problem in safe mode with Firefox 3.1 beta1.
Perhaps related to bug 460024?
That seems to be the case, this issue has the same regression range and the error message is similar. Marking as duplicate.