You cannot edit, add to, or change your saved passwords through the Passwords Manager. Some sites such as banks may prevent you from saving your passwords as a security precaution should someone get to your computer.

If you do have a user-id and a saved password stored, try double-clicking on the username to fill in the user id and often the password as well.

See http://kb.mozillazine.org/User_name_and_password_not_remembered

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See also:

• Saved Password Editor: https://addons.mozilla.org/firefox/addon/saved-password-editor/

There is no guarantee that passwords that you add manually yourself will get filled (most likely not), but at least you can paste them from the password manager window.