Literally it is a useless extension, I say literally because it only "blocks" some sites and others do not, and sometimes it doesnt work either. And write "blocks" because it does not avoid the pop-up since it opens an annoying tab, that's why it's useless.

I have been using this extension for years but with the last big update they destroyed all the good work they had done years ago, luckily there is an alternative that I found that is similar to the previous one and functional (I recommend it before this)