Firefox almost totally dead

FF started freezing on a once in awhile basis in June '10 and despite trying various fixes, it is now worse than ever and freezes every 2 minutes, literally.

I've tried removing add ons, various applications (silverlight, labtick) and the more I try to repair it, the worse I've made it. I installed an earlier version 3.0 but that failed to fix it.

I'm currently using Safari but want FF back!! Please help!!

Trash Firefox completely and download the latest version.
Also, verify your permissions in disk utility, and repair them.
That should sort any issues.

As above..... But you may need to use AppCleaner or AppZapper to locate all the associated files.
The reason I say 'locate' is that before trashing, if using AppCleaner for instance, you may want to keep your bookmarks! Therefore, you'll want to look at the files to see where the bookmarks are located, and uncheck that before you trash the rest.