Is there a reminder program if a user visits an unwanted site?

Question

Browsers

Is there a program (or browser extension) that displays a reminder like "Are you sure you're working?" if a user visits an unwanted site or stays on an unwanted site for too long?
Important: the program should not block the site, but simply display a reminder on the screen.

Answer 1

WOT: Web of Trust
Не совсем то, что вы ищете. На основе этой базы можно создать расширение под вашу задачу.