When comparing uMatrix vs AdBlock Plus, the Slant community recommends uMatrix for most people. In the question“What are the best ad blocking browser plugins?” uMatrix is ranked 4th while AdBlock Plus is ranked 8th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Ability to block a certain server for one website, but not for another
Pro Very fine-grained options what to block, what to allow
Pro Available for Chrome and Firefox
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.
Cons
Con Was abandoned
Developer has ended development but was willing to fix vulnerabilities, though this is not a guarantee that future vulnerabilities will be similarly fixed.
Con Operates only on servers, not paths or URL parts
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.