uBlock Origin 

Ad blocking has unfortunately turned into a veritable for-profit industry. There’s money to be made by letting people pay to get on the “acceptable ads” whitelists. uBlock is a true-blooded open source project without any such hidden pitfalls. The developers are not even accepting donations.

uBlock Origin is fast (faster than the competition, according to their own benchmarks) and gets the job done, whether you want to hide an annoying ad or other obnoxious content like Twitter’s Moments tab. The UI does take some getting used to, especially the “element picker” screen which you’ll need to master for setting up your own filters.

That said, if you’re willing to deal with a bit of a learning curve, I highly recommend making the switch from more popular ad blockers.