This browser add-on was recently introduced (in its beta version) by the Electronic Frontier Foundation. According to the EFF, Privacy Badger stops advertisers and other third-party trackers from secretly tracking where you go and what pages you look at on the web. If an advertiser seems to be tracking you across multiple websites without your permission, Privacy Badger automatically blocks that advertiser from loading any more content in your browser. Privacy Badger works with Firefox and Chrome.
Ernster, the Virtual Library Cat