Mozilla Firefox uses a great built-in password manager, however the only thing that is missing is the ability to export your saved login information. By exporting your login and password information you can save it to an external password management program. To add this functionality to Firefox, take a look at the aptly named Password Exporter add-on.
The add-on allows you to export your saved passwords and login hosts to an XML or CSV file that can then be imported into another browser or computer.
Be sure to not keep the export files available for anyone to access as the data is stored in non-encrypted plain text. When you are finished with these files, be sure to securely delete them, preferably using a secure deletion application.