your old bookmarks will still be in a folder on your computer, as mozilla backs them up. i cant remember where it is exactly and i cant look because i am not at home. but somebody else might be able to tell you that before i get home.

I found these on google, not sure if its any help of if you found this yourself:

http://kb.mozillazine.org/Lost_bookmarks#Prevention

Later on down the link:

http://kb.mozillazine.org/Lost_bookmarks#Prevention

Not sure if its any help Bliss.

The first link should go to the top of the page, but I posted the same link twice, apparently