1.5.0.6 ruined my firefox

I just installed the 1.5.0.6 update from within firefox. When I launched the new browser everything was messed up. I lost my history, bookmarks, extensions, saved passwords, and my sessions from session manager. My firefox went back to the way it was about a month ago. Even extensions that I had uninstalled came back. Is there any way to recover this data? What caused this issue?

I have been using portable firefox on my hard drive, not usb drive. I believe I downloaded 1.5.0.2 or something near that and upgraded to everything in between with the updater in firefox. This problem only happened with 1.5.0.6.