There are two, similar, though different, extensions.
uBlock origin is a dedicated, quite-good, low-fuss, ad blocker.
uMatrix is a much more general, very powerful, though somewhat fussy, general Web capabilities manager. If you don't mind fiddling with sites periodically, it's very strongly recommended, but for user populations who don't do this or grasp technology poorly, it will require some fairly close managing, _especially_ if the user base doesn't report problems and just accepts "the site is broken".
I'd highlighted my preset recommended set of browser extensions for 2018 a couple of weeks back. The hero image is uMatrix's control interface.
> for user populations who don't do this or grasp technology poorly, it will require some fairly close managing
I would never have imagined installing it for non-technical users, but one was interested in giving it a try and had no problem. They even said they really liked learning how the web worked (uMatrix shows a grid (the matrix) of hosts and functionality, such as CSS, images, scripts, media, etc.). So I gave it to another non-technical user, and they also like it.
Both have been surprised to see the number of domains that contribute to one webpage (most users assume it's all from the domain they typed into the URL field), and how often Facebook, Twitter, Google Analytics, and other tracking domains show up in that matrix.
If you've not been paying attention or specifically trying to counter that trend, you'd be amazed at how complex a typical site is. Even those which otherwise appear clean.
I appreciate the sentiment but indeed I know very well how complex a typical site is. Unfortunately I think a very large portion of most websites are far too complex for what they provide.
