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What is uBlock?
uBlock It is not a mere ad blocker; it is a general purpose blocker. It blocks ads as it supports Adblock Plus filter syntax, but extends that syntax and is designed to work with custom filters and rules. According to its creators, it leaves a very light CPU and memory footprint and, despite this, it can load and enforce thousands of filters used by other popular blockers, such as AdBlock Plus (ABP) or Ghostery. These lists include EasyList, EasyPrivacy, Malware Domains, and others that allow you to block trackers, social widgets, and much more. It also brings support for hosts files and allows you to add other sources, in addition to those that come "from the factory".
uBlock works in both Chromium / Chrome and Firefox and, unlike Ghostery, is distributed using the GPLv3 license, making it a tool for FOSS. While Ghostery is very efficient, not only is it not free software but there are serious suspicions that through the "GhostRank" function it sells data on the blocked ads to the advertising companies themselves. Instead, I recommend that you try other free alternatives, such as Disconnect o uBlock. Another point to keep in mind is that uBlock -as well as ABP, AdGuard, and some others- allows users to enter their own filters, something that is not possible with Ghostery or Disconnect.
In my experience, since using uBlock, the browsing speed has taken a really remarkable leap. Also, web pages look "cleaner" and without so much superfluous content to distract me. As if that weren't enough, unlike Adblock Plus (ABP), uBlock uses significantly fewer resources. Here are some comparison charts to prove it.
Just because uBlock is agile and efficient doesn't mean that block less trackers.
In my opinion, this point requires a brief warning. uBlock does not block by default some widgets of Facebook, Twitter, Google+, etc. that other extensions do block. For this, it is necessary to activate some third-party filters (which are already available in uBlock), such as Anti-ThirdpartySocial or Fanboy's Social Blocking List. Anyway, you have to play around with the lists until you find the balance you are looking for. Another option, a bit more complex, is to enable the advanced options and set dynamic filter rules.
Installation is very simple, you just have to install the extension corresponding to the web browser you use.