minerBlock (Chrome, Firefox, Opera)
Also, to consider duckduckgo's extension.
DuckDuckGo Essentials is certainly a good add-on, but it isn't the best. The issue it has (and many anti-tracking add-ons have) is that it simply uses a list of known trackers, and blocks anything that appears on that list. Compare that to Privacy Badger, which I recommended on my reply on the first page of this thread. Privacy Badger actively monitors your browsing session for anything that is trying to track you and blocks it. It has the advantage of catching quite a lot of stuff that is yet to be updated on to the anti-tracking lists that other add-ons use. DDG Essentials does some other stuff too, such as forcing encrypted connections, but that can be easily replicated by using HTTPS Everywhere (again linked to in my previous post).
DDG Essentials is certainly a good add-on if you want something quick, easy and requiring no set-up, but if you are looking for the best privacy, security and anti-tracking, then Privacy Badger + others is the way to go.