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uBlock Origin are free and open source, cross-platform browser extensions for content-filtering, including ad-blocking. They are available for several browsers, including Chrome, Firefox, and Safari.

uBlock Origin has received praise from technology websites, and is reported to be much less memory-intensive than other extensions with similar functionality. uBlock's stated purpose is to give users the means to enforce their own (content-filtering) choices

Much better than other adBlockers ..

Dev.

for FF:

uBlock Origin For Chrome