Copy Firefox passwords to new os Backup firefox password file

All firefox passwords are stored in three files

signons.txt, signons2.txt, key3.db

These files are stored in your firefox profile folder.

In Windows XP firefox profile is at:

c:Documents and SettingsWindowsUsernameApplication DataMozillaFirefoxProfilesprofilename

Copy these three files and save them where ever you want and if you want these passwords in your other os also then just replace these three files.