Just helped my wife to migrate her firefox profiles. She only need to migrate the bookmark and remembered password, other stuff is worthless.
Here's the steps:
- Locate where the profile is: refer to this article http://kb.mozillazine.org/Profile_folder
- Start firefox profile manager from command line: firefox -pm
- Create a new profile, and set it as default profile, close firefox
- Copy the following files from old profile to new one: bookmarks.html cert8.db key3.db signons2.txt
- Restart firefox and enjoy :-)