This extension opts you out of the DoubleClick advertising cookie, which Google uses to show you interest-based ads on partnering websites. - Stops interest-based ads on some of the websites that partner with Google - One-time install on Firefox - Opt out remains in effect, even after you clear your browser’s cookies For developers IBA Opt out extension by Google is available as open source at http://code.google.com/p/google-opt-out-plugin/ Terms of Service By using IBA Opt out, you agree to the Terms of Service at https://chrome.google.com/extensions/intl/en/gallery_tos.html