I've used Leechblock, with fairly permissive settings (type a 64-bit key displayed on screen to override), and I think the annoyance is the point. It raises the

I've used Leechblock, with fairly permissive settings (type a 64-bit key displayed on screen to override), and I think the annoyance is the point. It raises the psychological cost of going to a time-waster website, which makes it less desirable.