Why Firefox is unsafe to use in cybercafes

Firefox has been trying to take on Internet Explorer in the browser war. I like it but I am afraid of it's one feature of restoring session when it is closed abruptly. Even password protected sites such as Gmail opens. If you use Firefox and there is power failure that your computer shuts down. The next person has a option of restoring your session. If he does it then you and your account is at his mercy.