Approximately 2011–2018 [1]. For most of that time it existed as a browser extension similar to this one, but it started off as a first-class feature of the sit

Approximately 2011–2018 [1]. For most of that time it existed as a browser extension similar to this one, but it started off as a first-class feature of the site. [2] [1]: https://github.com/codyogden/killedbygoogle/issues/674 https://github.com/codyogden/killedbygoogle/issues/674 [2]: https://googleblog.blogspot.com/2011/03/hide-sites-to-find-more-of-what-you.html https://googleblog.blogspot.com/2011/03/hide-sites-to-find-m...