Greasy Fork is available in English.
Adds a MP3 Download button next to the subscribe button, thanks to youtubeinmp3 for their simple download service (http://youtubeinmp3.com/api/). Based off magnus's youtube2mp3 code. Just used something different as it wont open another tab.
< Opiniones de Youtube MP3 Download Button
It isn't working.
I'm "using" this on my computer, (Chrome) but it's not working. It says that the script is missing something.