Porteus Kiosk is a lightweight linux operating system which has been restricted to allow only use of the web browser. Furthermore, the browser has been locked down to prevent users from tampering with settings or downloading and installing software. When the kiosk boots it automatically opens firefox to your chosen home page. The history is not kept, no passwords are saved, and many menu items have been disabled for total security. When firefox is restarted all caches are cleared and browser the reopens automatically with a clean session to ensure no trace of history is left.