Did you delete your old Firebird installation? If not, just open it, go to Manage Bookmarks, then click on File -> Export. You can then Import them in Firefox.

Also, if you did delete 0.7, you might do well to check your Profile Manager (the installer even adds a shortcut to it in your start menu, unlike previous releases where you just had to type -p in the Run dialogue). You might be able to start Firefox up with your old Profile, but you'll just want to export your favorites and make a new profile anyway.