Greasy Fork is available in English.
Adds an ability to hide thumbnails of videos you've already watched.
< Feedback on Hide watched videos on YouTube
Thanks for the feedback!
Adding a manual system for marking videos would require a bit more work than I'm able to do at the moment I'm afraid. But I'll keep your suggestion in mind for the future updates, though it probably won't happen any time soon.
I have a sugestion. I want to binge watch a youtuber channel, but i want to manually hide the video. I prefer that way. Can you update the extension to add that option for weirdos like me that like to do that way?