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Google cancels plans to kill off cookies for advertisers
(www.cnbc.com)
This is a most excellent place for technology news and articles.
Seems they're both from the same developer, with slightly different objectives. However, uMatrix's repository has been archived and hasn't updated in years. Even if you use a fork, the first line of the README is "Definitely for advanced users." I don't consider uMatrix a working solution for the average user, which is most people.
I don't feel like engaging with the first phrase of your comment as it is, lacking even a single concrete example or further resources to look into.
But but but... don't you trust them?
That's a long page. I can't promise to do it quickly, but I'll try taking a look later.
I think you might've meant "in one sitting."