"Do Not Track Me"...but I still have multiple cookies Rated 1 out of 5 stars

How is "Do Not Track Me" actually working?

Upon install there's a lovely icon on the top right. When I click on that I see all the sites that are now supposedly not tracking me...upon selecting Tool/Options/Show Cookies in Firefox, all the cookies that were ever there in the past are there.

What is this program actually doing?

This review is for a previous version of the add-on (2.2.5.1205).