Currently called Collusion, but soon to be renamed Lightbeam, it shows you who is tracking you for each site you are on (including separate tabs and windows). It is currently only available for Firefox and not available on mobile devices (Google and Apple have blocked it). Here's an article on it: http://www.independent.co.uk/life-s...ng-over-your-shoulder-on-the-web-8902269.html Current page: http://www.mozilla.org/en-US/collusion/