[psysop]

Firefox хранит пароли в зашифрованном виде по адресу

C:\Documents and Settings\Имя юзера\Local Settings\Application Data\Mozilla\Firefox\Profiles\

Если данная папка не была затёрта, то можно вытащить пароли, закладки etc. Есть хорошая утилита для этой цели.
Ваши пароли хранятся в файлах key3.db и signons.sqlite

многа букоф на ENGлише

Your important data and their files
Bookmarks and Browsing History
places.sqlite 

This file contains all your Firefox bookmarks and the list of websites you have previously visited. For more information see Bookmarks. 
Passwords

Your passwords are stored in two different files, both of which are required: 
key3.db - This file stores your key database for your passwords. To transfer saved passwords, you must copy this file along with the following file. 
signons.sqlite - Saved passwords. 

For more information see Remembering passwords. 
Site-specific preferences
permissions.sqlite 

This file stores many of your Firefox permissions that are decided on a per-site basis. For example, it stores which sites are allowed to, or blocked from setting cookies, installing extensions, showing images, displaying popups, etc. 
Search engines
search.sqlite 
\searchplugins\ folder 

If you have installed any extra search engines then they will be in the \searchplugins\ folder. The search.sqlite file stores the order that your search engines appear in Firefox. For more information see Search bar. 
Personal dictionary
persdict.dat 

This file stores any custom words you have added to Firefox's dictionary. If you have never added a custom word to the Firefox dictionary, then you will not have this file. For more information see Using the spell checker. 
Autocomplete history
formhistory.sqlite 

This file remembers what you have searched for in the Firefox search bar and what information you have entered into forms on websites. For more information see Form autocomplete. 
Cookies
cookies.sqlite 

Cookies are used by websites for a variety of reasons, some of which include keeping you logged into a website you have previously logged into, remembering any preferences a website has allowed you to set, authenticating you as a person who has visited a specific website before, etc. For more information see Cookies. 
Security certificate settings
cert8.db 

This file stores all your security certificate settings and any SSL certificates you have imported into Firefox. 
Download actions
mimeTypes.rdf 

This file stores your preferences with respect to what Firefox does when it comes across known file types. For more information see Managing file types. 
User styles
\chrome\userChrome.css 
\chrome\userContent.css 

If they exist, these two files store user-defined changes to either how Firefox looks, or how certain websites or html elements look or act. Most people will not have these files. You may have two files in the \chrome\ folder called userChrome-example.css and userContent-example.css, but both these files can be safely ignored.