Firefox 2.0 on OS X broken from the get-go!

Well, I was excited to see that Firefox 2.0 has been released, and early to boot! I will admit though, I was a little disappointed at the end result. I gladly splatted my existing version of Firefox (1.5.07) with the latest Mozilla release, only to find it unusable. All the content was crammed into the left hand side of the window, tabs and all. 15 minutes of troubleshooting later diagnosed it as an extension problem. Finally discovered the culprit: Tabbrowser preferences v1.3.1. uninstalled it, and Firefox 2.0 is now purring along nicely. Interestingly enough, the latest version of Tabbrowser preferences (1.3.1.1) exhibits the same behavior.. oh well.. I guess I will have to file a bug report...