After trying to find a YouTube downloader that would actually complete it's given task of converting a single rare piece of music into an mp3, I tried this by uepselon.

Success finally, after at least a dozen failed add ons, and a donation to them on it's way.

Thank you so very much.

thankU 谢谢

es perfecta.
pero como todo,se podria mejorar.

ok mantap

404 Not Found error, no matter what Youtube video you'd like to download as MP3.
EDIT: yes, with 2.4.1 it works, thanks

good

YouTube Download Plus was just one of several dozen Firefox extensions claiming to be the best video downloading tool available in the 21st century. Frankly, I thought I'd try it because I was looking for something simple and that worked as advertised, two small criteria that, sad as it sounds, most of the other extensions I had tried failed to satisfy. But this extension satisfies BOTH of them: it's simple to use, doesn't take up much space and does exactly what it claims to do: "Download YouTube videos as MP3 or MP4." This may sound like a simple request, but it's not. Or at least it WAS not. Thanks to uepselon, it actually HAS become so, and you have my gratitude. :)