I am using this to enable a script that runs on Firefox at YouTube playlists to enable a download of the playlist items' details. It has worked flawlessly and I am well pleased.
https://greasyfork.org/en/scripts/418605-export-youtube-playlist-in-tab-delimited-text

很好用，五星好评

It let me bypass Youtube's trash 'age restriction' on a video I wanted to watch. (never going to make an account on there lol) This thing worked for exactly what I needed it to. 5stars.