I seem to stay logged into Facebook even when I quit Firefox. Why is this?
Facebook has a small “Keep me logged in†checkbox at the top of the page where you sign in, so you may be continually signed into the site if that box is checked. If it is, log out of Facebook manually by clicking the gear-shaped icon in the top-right corner and choosing Log Out from the menu. Once you have signed out, remove the check from the “Keep me logged in†box.
You may also want to delete the browser cookie for Facebook and restart Firefox, to make sure you stay logged out. You should check that Firefox is not set up to restore your previous browsing session.
As an alternate approaches, using a Firefox add-on, Facebook Auto-Logout, automatically logs you out of your account. You can also sign out remotely from one computer when logged into another computer by using Facebook itself.
