uMatrix

uMatrix: point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc.
uMatrix Wiki: https://github.com/gorhill/uMatrix/wiki
If you’re able to withstand the learning curve of uMatrix you’ll be rewarded many times over with a faster, safer internet, and enhanced privacy. As time goes on, more and more services and apps are trying to track you and use your data for their benefit, so the best time to learn how to safeguard your internet browsing experience is now. – Angelo Spampinato
More information on https://medium.com/@angelospmusic/umatrix-and-why-you-should-be-using-it-c747015717e4