This extension keeps YouTube video on screen when scrolling down to the comment section
Secret feature: you can click on the icon next to the address bar to temporarily toggle the small player when reading the comments. Try it out, and let me know what you think :}
Note: Adblock products are currently known to interfere with this extension. It doesn't affect me even although I also have Adblock installed. If the extension doesn't work, you can try turning off Adblock and see if it works for you. I'm currently working on this problem.
Update Feb 21st 2017:
You can now use Adblock with this extension. Enjoy fam :}
Update Feb 22nd 2017:
Fixed bugs where a small player appears when you scroll down even though you're on YouTube's home page/subscription page/trending feed page etc.
Fixed "invalid package" error in Ubuntu
Update Mar 19 2017:
Fixed bugs when it un-mutes the mini player even though you've muted the main player before you scroll down. Same thing for when you scroll up.
Update May 5 2017:
Fixed bugs where the playback speed of the mini player doesn't match up with the playback speed of the main player.