• https://support.mozilla.com/kb/Remembering+passwords
• https://support.mozilla.com/kb/Protecting+stored+passwords+using+a+master+password

• http://kb.mozillazine.org/Password_Manager

Guess I am really dumb but I had found all the info in the answers before. That did not help to "start " the firefox usage for password use. I do not have this password program "pop up" when I go to a site - how do I "start" that?

You only need to enable the Firefox Password Manager and set a master password in you want to save passwords in Firefox or use a different extension.

• Tools > Options > Security: Passwords: "Remember passwords for sites"

See also:

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

• LastPass Password Manager: https://addons.mozilla.org/firefox/addon/lastpass-password-manager/
• Autofill Forms: https://addons.mozilla.org/firefox/addon/autofill-forms/