Hides already watched YouTube videos from recommendations.
When on a channel's video library, it'll hide many videos randomly, and disable the watched-progress red bar (I confirmed with trial and error that this app was the cause). Good luck to the developer fixing this, though.
This extension program has very tiny bite than other programs and it works very well.
http://vidiq.com/
https://unhook.app
https://giraybal.com
thefyrewire
Adam Jones
ris58h
https://davidschiller.net
Alex
GoAgentic
https://unhook.app
jacamera
https://zxtube.github.io/YouShield/