*Click the (empty) input field on the web page to open the drop down list *Highlight an entry in the drop down list *Press the Delete key (on Mac: Shift+Delete) to remove it. ----- If the name doesn't change and you only need to change (update) the stored password then fill the name in the login form and let Firefox fill the wrong password.<br /> You may have to press the Tab key to fill the password field with the old password.<br /> If you replace the wrong password with the new password then Firefox should offer to store the new password via the pop-up dialog from the key icon on the location bar (Firefox 3 versions show a bar at the top). Use the Remember Password bookmarklet on websites that use "autocomplete=off" to prevent Firefox from saving passwords. * http://kb.mozillazine.org/User_name_and_password_not_remembered (bookmarklet) Verify that Firefox has stored the new password. * Firefox > Preferences > Security: Passwords: "Saved Passwords" > "Show Passwords" If that didn't work then remove that name and password in the Password Manager.