uBlock Origin

uBlock origin does its job very well.. it blocks ads.. EVERY single ad.. I have been using the extension for over 4 years.. lucky me for finding this so early! It blocks every harmful and "innocent" ads and has a filter list so you can have control over what you want to filter out. I do like its UI, it is simple yet effective! Tells you how many ads it has blocked and trackers, which works very well and tells you in its icon as well! Overall I would say this is one of the best adblockers and semi-anti-tracker tools that does not require you to pay, so it's a huge win!