Rated 5 out of 5 stars

I think this is great.

But one question: Does it also block third-party tracking cookies?

My understanding is it blocks the site I'm on, and that's super cool, but I don't see mention of third-party blocking anywhere.

This review is for a previous version of the add-on (3.2.1083). 

Yes it blocks 3rd party tracking cookies

It also blocks newer tracking technologies that do not rely on cookies to track you. hope this helps.