Have you looked for bookmark backups in your profile? Firefox_profile It depends what version of of Fx you were using. If 3.6.x they are json files which you should be able to import.
Otherwise, restore the whole profile from a backup, and set up a new profile for TFF with the profile manager.
Take a copy of the profiles' containing directory first.
By clicking on the User Name, you will requery the forum for that user. You will see everything that he or she has posted with that Mudcat name.
By clicking on the Thread Name, you will be sent to the Forum on that thread as if you selected it from the main Mudcat Forum page.
By clicking on the Subject, you will also go to the thread as if you selected it from the original Forum page, but also go directly to that particular message.
By clicking on the Date (Posted), you will dig out every message posted that day.
sj