How do I add an automatic user name and password fill-in for a website
When first visiting a website that requires a login, Firefox provides an option to remember the login/password for the site. If this option isn't selected the first time, how does one get Firefox to remember the login/password at a later date?
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If you clicked "Not now" then Firefox will ask again on the next visit to that log in page.
If you clicked "Never" then you create an exception and you need to remove that exception.
You can remove exceptions here: Tools > Options > Security: Passwords: Exceptions
See also Password manager - Remember, delete, change and import saved passwords in Firefox
http://kb.mozillazine.org/User_name_and_password_not_remembered