IDcide Privacy Companion is a free browser add-on (3 small icons) that alerts you when & where you may be followed on the web and by whom, allowing you to block third party trackers (like DoubleClick ) while still receiving personalized services from the site you are visiting. The IDcide Privacy Companion deals with both incoming and outgoing cookies, uniquely distinguishing between site cookies and third party cookies. Privacy Companion protects from third party trackers that transmit cookies through banners and Web-Bugs, and from accidental Data Spills by blocking referral information.