uBlock Origin (uBO)
A wide-spectrum blocker. Easy on CPU and memory.
µBlock Origin (µBO, pronounced micro-block origin) is a wide-spectrum blocker for browsers with a simple point-and-click interface to allow users to filter and block server requests, domains, scripts, and more. By default it blocks ads, trackers and malware sites.
Users should note that uBlock Origin and uBlock, while they have some history, are now distinct programs whose code base has diverged form each other for some time, with uBlock Origin being the more actively developed and better maintained of the two.
20 October 2015
https://github.com/gorhill/uBlock/blob/master/LICENSE.txt Addendum: "Some of the 3rd-party filters (simple data files) in this software are under non-free licenses. However, it is not clear that the works in question are actually subject to copyright or that the licensing terms could apply. As such, we urge you to use redistribute those filters with caution that someone may try to claim copyright on the works." - Joshua Gay, Licensing & Compliance Manager, Free Software Foundation - https://github.com/gorhill/uBlock/wiki/Filter-list-licenses
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