As the helpful mozilla support page points out, there are files in "profiles ... default":
Your passwords are stored in two different files, both of which are required: key3.db - This file stores your key database for your passwords. signons.sqlite - Saved passwords.
You might also want: places.sqlite - all your Firefox bookmarks and a list of websites you have previously visited.
3.5/3.6: * signons.sqlite - Saved passwords. 3.0: * signons3.txt - Saved passwords Cookies: * cookies.sqlite