The main Facebook login page uses '''autocomplete="off"''' to prevent the username and password from being saved, and Firefox respects that code. This bookmarklet makes the browser ignore autocomplete="off" temporarily, allowing you to save passwords. <br /> Remember Password bookmarklet: <br /> https://www.squarefree.com/bookmarklets/forms.html#remember_password Or you can use this extension to manually add the username and password to Firefox for the Facebook domain. <br /> https://addons.mozilla.org/en-US/firefox/addon/saved-password-editor/