Greasy Fork is available in English.
YouTube 인터페이스를 더욱 동적으로 만들고, 키워드로 동영상을 숨기고, 다운로드 버튼을 추가하고, 광고 없는 페이지에서 동영상을 엽니다(youtube-nocookie embed).
If you can print it and show it here, I don't know what you're talking about. Are you sure it's not another script?
Script appears to be broken, instantly erroring and having a very small size