This is an alpha release so EFF encourages users to install and try it.
Privacy Badger is a browser-add on tool that analyzes sites to detect and disallow content that tracks you. When you visit websites, your copy of Privacy Badger keeps note of the "third-party" domains that embed images, scripts and advertising in the pages you visit.
If a third-party server appears to be tracking you without permission, by using uniquely identifying cookies to collect a record of the pages you visit across multiple sites, Privacy Badger will automatically disallow content from that third-party tracker. In some cases a third-party domain provides some important aspect of a page's functionality, such as embedded maps, images, or fonts. In those cases, Privacy Badger will allow connections to the third party but will screen out its tracking cookies.