I had a downloader that worked pretty well, but it stopped working a few days ago due to a YT update, so I gave this one a try. It does everything I need it to do, and nevermind the fact that it asks you to buy the upgrade to DL the Mp3 files. An online search for "audio file extractor" will steer you toward an add-on that can pull an Mp3 out of the Mp4 videos this add-on lets you download. It's an extra step I know, but if you, like me, are flat-broke, you learn to make-do.

For what it's worth, the one-click green button right there on the YT page is nice and convenient.

paid for pro doesnt work. complete trash

This works great at YouTube EXCEPT if I try to download music videos. I hope it gets fixed soon, as it was and would be a five-star extension!

ADDED: I had paid for the Pro version, and find that if I select MP4 720p HD, it works just fine.

ADDED 7/14/21: It's fixed now, so I can download music video 360p .mp4s.

Thanks, Dishita!

PRO users are allowed to load in 720, those who do not look pay 320.
therefore only one star, that is already too much!

Best you tube down loder I have used Thank you 10 stars

It has stopped working :( after the last Firefox ugrading, it was the best extension ever

seamless integration, a pleasure to use.
Hands down the best downloader to use.

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best option i have so far for downloading youtube vidoes

need pay, and only work with first video.
then,download fail. useless.

so good Ilove it

its working

Great little add-on. Never seems to fail. Does exactly what I want it to do. 5 Stars.