Anonymizer, Inc. has developed Anonymizer Nevercookie, a free Firefox plugin that protects against the Evercookie, a javascript API built and made available by Samy Kamkar (same guy who brought you the Samy Worm and XSS Hacking to Determine Physical Location) who set out to prove that the more you store and the more places you store it, the harder it is for users to control a Web site's ability to uniquely identify their computer. The plugin extends Firefox's private browsing mode by preventing Evercookies from identifying and tracking users