Thank you for your input :). While this add-on has more flexibility on what to keep in your browser, it only deletes them after they have entered your system. It’s actually not as useful as it sounds because your data is already exchanged with the server.
If you are interested you can read my too long edit to see what I meant and how to block specific cookie before they enter your system. Also on how to spoof your user agent and activate privacy.fingerprintingProtection in firefox.