When comparing AdBlock Plus vs uBlock Origin (as a Firefox addon), the Slant community recommends uBlock Origin (as a Firefox addon) for most people. In the question“What are the best ad blockers for Android?” uBlock Origin (as a Firefox addon) is ranked 4th while AdBlock Plus is ranked 15th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Free & open source
Pro Blocks a wide selection of annoying ads
Video ads on YouTube, Facebook ads, flashy banners, pop-ups, pop-unders and much more.
Pro Fastest loading times
Pro Promised to remain commercial interest free
uBlock will remain free from any commercial as stated by the creator. uBlock is meant to be strictly for the users and completely free.
Cons
Con Uses too much RAM
AdBlock+ tends to use a lot of memory, which has been documented in many use cases as well as admitted by AdBlock themselves. Considering there are alternatives out there that can block ads successfully with half the RAM usage as AdBlock, one has to wonder why this is a problem specific to AdBock.
Con Users automatically opted in to whitelist
AdBlock+ has an automatic whitelist when installed that allows certain advertisers through the blocking mechanism. The fact that these advertisers pay for this privilege makes this particular scenario rife with conflict of interest.
Con Doesn't block background ads yet
Ads that replace the background image of a website are currently beyond the scope of the ad-blocker, but the functionality is planned to be added in the future.