I was using this extension from more than 7 years. It's really fantastic.

Works partially : only the video-only and audio-only files are correctly downloaded ; there is an issue with "normal" files : only the audio track is downloaded.

Funktioniert tadellos, besser als alles andere, zuverlässig und schnell,... topeinfach, einfach top! ...

Muy buena...

It is broken. Youtube has changed something to the effect that the video file extensions and the audio file extensions are switched.
The workaround (manually renaming the files as they are saved to disk) is kind of a pain in the ass.

Also, switching the "Homepage" from:
https://github.com/inbasic/iaextractor/
to:
https://addons.mozilla.org/en-US/firefox/addon/youtube_downloader_webx/
would be very nice.

Very good addon/works well. I would like to see it have an option to remember the last folder saved to, as I save to many different folders and it gets tedious to have to drill down to a specific folder when downloading similar videos each time.

Does NOT download both the audio and the video and combine them for you. 3-19-18 Firefox 59.0.1

Good

Works really well with Youtube. :)

virus un .bat comme d'hab ( j'ai même pas télécharger l'extension ptdr(plié tordu de rire) tas de merde !

pas de conversion mp3, le fichier en supplément dans le module firefox demande de télécharger un logiciel a pars de firefox (2 modules et un executable en plus, de la merde...

It properly enlists what is on the Youtube website. The best part is to download the Audio-only file which was one of the features of Flashgot, but not working in Quantum.
Thank you

That is the best

I try new version and I didn´t find how to configure for downloading only audio.
Now I am using little bit more uncomfortable
https://addons.mozilla.org/en-US/firefox/addon/simple-youtube-converter

but it works :-/

I would rate this four stars if it did not mangle the filenames. It replaces characters like a comma or parentheses with a hyphen (it's becomes it-s).