Some sensitive sites are designed to not even save passwords on a browser. If it is a password saved on Firefox you do have control and may delete it. * [[Password manager - Remember, delete and change saved passwords in Firefox]] ** [[Use a Master Password to protect stored logins and passwords]] Some login fields may be determined by the provider. For instance your account number &|or user name may be provided or chosen for you, but that is something to take up with the site concerned.