Password Exporter is a Firefox add-on that, as clearly stated on its name, enables you to export all the passwords saved in the browser to a file, either in XML or CSV file.
The extension makes use of the browser's ability to save any password you enter on any web form, so that you don't have to remember all of them nor type them again.
The same program can be used to import passwords back to the browser, so it works as a great way to move your saved passwords from one PC to another. Just one tip: be very careful with this password list, because although the program features encryption abilities, that doesn't guarantee the safety of your passwords at all.
With Password Exporter you can easily export, backup, share and import all the passwords saved in Firefox.