uBlock Origin

     uBlock Origin is a highly configurable browser extension that blocks third party advertising, trackers, and malware sites. 
     You will find that most sites render noticeable faster with ads and trackers turned off. And, in some cases, web pages that were not rendering at all previously will look great with all the offending components blocked. 

     It's a free and open source, cross-platform browser extension for content-filtering, including ad-blocking. The extension is available for several browsers:  Safari (Beta), Chrome, Chromium, Edge, Firefox, and Opera. uBlock Origin has received praise from technology websites, and is reported to be much less memory-intensive than other extensions with similar functionality. 
     uBlock Origin's stated purpose is to give users the means to enforce their own (content-filtering) choices. It doesn’t require any technical skill to install or use. For those with some technical knowledge, it is highly configurable. 
     As of 2017, uBlock Origin continues to be actively developed and maintained by founder and lead developer Raymond Hill.  Hill withdrew his support for uBlock, an older branch of the software, citing "serious incompatibilities in the spirit of the project." 
     uBlock Origin includes a growing list of features not available in uBlock which includes a lot of technical stuff, but one handy feature is a site-specific switch that allows you to toggle the blocking of pop-ups. The Firefox version of uBlock Origin has an extra feature which helps to foil attempts by web sites to circumvent blockers. Techies claim it's also less resource intensive in comparison with similar programs such as Adblock Plus. 
  

  
     Turning off filtering for a website is as simple as clicking on the big blue button in uBlock Origin’s pull down window. And, you can permanently unblock a site by adding it to a Whitelist that can be edited right in the browser.