Web related leakage Your web browser leaks a frighteningly large amount of information about you. For example, even after you protect yourself by concealing your IP address through Tor, it is still possible for someone to use a Java program to obtain your actual source IP and hostname. And this is only the beginning. An excellent test utility to test all the different types of information that can be obtained from your browser is available at BrowserSpy. Most of these can be handled by the excellent Firefox extension NoScript. You are encouraged to test out your browser there in addition to looking over the following material. Contents 1 Cookies 2 Browser User Agent And Capability Info 3 Referrer Url 4 Browser History 5 Web bugs 6 Desktop and Web Browser Extensions Cookies Cookies can be used to track your web usage across even a Tor session, where each connection originates from a different IP. This can be both a blessing and a curse. A blessing bec