This may be a bit off topic, but one of the extensions I loved was forced to be unpublished from Chrome Store. Its called Streamus and it plays audio of a Youtube video in the background and it was really good!

Email Communications from Google: https://imgur.com/15gaOf6 HN: https://news.ycombinator.com/item?id=9873255

I wish this extension existed still when I can legally not watch a video with Youtube RED.