Just installed this extension after trying a couple of similar ones.
I decided to download this one because, besides good ratings, the author answered to some reviewer something like this: "Sorry, but your "review" is nonsense...", so I decided to use it because I like straightforward speak in an age of political correctness.
This extension works great. It gives you a button that looks like it could've come from YouTube (I mean it's not some blinking fluorescent red gif monstrosity) that, when clicked prompts you to choose whether you want audio (mp3) or video (mp4). Upon choosing it converts the video and offers you to download (or: Share, Save to dropbox, Listen, Convert another video).
Completely free, though if it continues to works this smoothly I'll donate.

Very clean User interface, very simple and quick. It blends in very well with YouTube. Its not a huge and obnoxious button that says DOWNLOAD VIDEO NOW and then takes you to a site with virus and ads. Highly recommend this if your looking for a YouTube download button.

....ECCELLENTE!

Super sencilla, funciona perfecto.

thank

The add-on is quick and easy to use, and the downloaded audio/music is kept in a good quality (192kbps).

The website has a feature to add tags to downloaded audio files (e.g. artist name and song name) to allow easier file sorting, but it'd be nice if the extension had the option to add these automatically so there's one less page to go through when downloading the file - this is an excellent add-on otherwise.

Tancks!!

Good

very good

excelente

This Add-on inserts a Donate-Button next to the Subscribe-Button, making it seem as if you support the content creator on YouTube. Instead it's a link to a Patreon page without any information on it.

The downloader used to work well, but shady tactics like this shouldn't be supported.

Hi and big Thanx ! Can't convert video!
https://www.youtube.com/watch?v=YF4-H2UGHQI

super věc. rychlý jako blesk.