I installed the plug-in and went to three sites I know contain tracking code. Privacy Badger tells me "Could not detect any tracking cookies." ... Am I missing something?
This is an alpha release; we've been using it internally and don't think it's too buggy. But we're looking for intrepid users to try it out and let us know before we encourage millions of people to install it. If you find bugs, you can file them on github against either the Firefox or Chrome repos as appropriate.