Adblock Plus, supporting a wide variety of web browsers, also has over 10,000,000 people currently utilizing its blocking engine to stop invasive ad's from overtaking your screen. However, this software Allows Acceptable Ad's, meaning that many websites rely on display advertising for their revenue and to stay afloat, along with cover expenses of hosting and employees, thus encouraging them to use nonintrusive display ad's to generate revenue. The “Acceptable Ad's” criteria can be found here if you are interested in the details of it. This add-on blocks tracking cookies, malware websites, banners, pop-up and pop-under video ads and Facebook/Youtube ad's.
Read complete content : The Best (and Worst) Ad Blockers UPDATED | reapinfo
Another Free add-on, with 3,175,430 active users at the time of this writing, totes to be “superfast” and block 100% of all ad's on Facebook, Youtube and websites, yet it doesn't have an official website yet.