An extension that shows if the site is in the registry?

Question

Google Chrome

Is there such an extension?
And then you can go to all sites - and it is not clear when visiting whether the site is prohibited or not.

Answer 1

I had to make this extension myself.
Chrome
Firefox

Answer 2

Why an extension? Usually, when visiting prohibited sites, the major sitting next to him threatens with his finger.

Answer 3

isitblockedinrussia.com