Does what it says out of the box! It blocks the websites without alerts, it just doesn't let you click on links leading to those websites or use them whatsoever. Very nice extension, would recommend to others.

update: I personally like forest more because of the tree gimmick, but both of these together just go soo well

second update: wish there was an allowlist instead, with forest there is, but on non-whitelisted websites it shows a simple cover that i just remove with ublock origin block element, but this extension just stop me from accessing the website all together