Firefox's Password Manager
Firefox's Password Manager can store your user names and passwords and enter them for you automatically when you visit sites that require them.
When you enter your user name and password at a web site, a dialog box appears asking, "Do you want Password Manager to remember this logon?" If you choose "Yes," the next time you return to the site you'll see that your user name and password are already filled in.
To see your list of saved passwords, follow these instructions:
If you're using a PC, click the Tools menu and select Options. Click the Security tab and click Show Passwords.
If you're using a Mac, go the Firefox menu and select Preferences. Click the Security tab, then click the Show Passwords button.