Greasy Fork is available in English.
Adds a progress bars (or dots) at bottom of video, a progress text which includes video quality and subtitle indicators, and a chapter title box on the YouTube video page.
< Feedback on Add YouTube Video Progress
Sorry for the late reply. Been busy lately. Anyway, the supported media formats have been updated based on the information on that page.
Hello,
Can you add AV1 format IDs?
['MP4', 'AV1', [394,395,396,397,398,399,400,401,402,571,694,695,696,697,698,699,700,701,702]],
https://gist.github.com/MartinEesmaa/2f4b261cb90a47e9c41ba115a011a4aa