All these blockers have one drawback: they interrupt your work and redirect you to their page. And there they happily inform you that the site is blocked.

i used this extension to block porn sites

works great, and it's soooo easy to use. def recommend!

my sibling told me to stop watching YouTube, so I use this to prevent myself from doing so. thanks!

I usually don't use extensions on Chrome, but this one really helped me to raise my productivity. It's easy to use and very reliable! Really happy that I came across it.