Greasy Fork is available in English.
Add two download buttons to YouTube videos that allow you to download MP3 or Video without leaving the page with the option to choose the quality.
< Feedback on Simple YouTube MP3/VIDEO Buttons
It also stopped working here. I do not know why, but I found another script very similar, only for MP3, but that is working ... https://greasyfork.org/pt-BR/scripts/20015-simple-youtube-mp3-button
I've tested it now, and it's working perfect.
Script might be broken
So I just tried to use this script today, and when I did it just gave a link that went to this instead. Please help.