Mindful Browsing - Control habit forming, distracting or aggravating websites.
www.mindfulbrowsing.com
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
With Mindful Browsing, you can block the websites that cause you these problems. Once blocked, if you try to visit one of these sites by following a link, clicking a bookmark, or typing the address, Mindful Browsing will show you a warning page reminding you that you blocked the site, and encouraging you to decide whether or not you really want to visit the site.