WOW. Just keep at it, this works wonders.

Ne marche pas : le message d'erreur suivant s'affiche :
Youtube switched to separate audio/video streaming technology for higher quality formats and no longer provides direct 720p (Since 24 September 2018)/1080p/mp3 streams. Converting these streams to downloadable formats for you needs powerful server infrastructure, therefore 1080p/mp3 downloading has been limited to PRO users. Read more at - https://videodroid.org/pro_upgrade.html. FREE users can download all formats in CACHE where some PRO users fetched the video/audio in past 24 hours, to test the feature you can try downloading popular videos.

No longer works unless you buy pro

GoooooooooooooooooooooD

cannot download anymore. requires convert server.

Does not work for 720p or 1080p, crap.

Ne fonctionne plus depuis les nouvelles mises à jour Firefox

does not work have tried it on all settings and nothing.

this has been kept functional for many years. it stops working occasionally, but it always comes back. thanks so much!

This add on wastes so much of my life. Look developers: Charge me whatever you need to. I don't care. Just give me a service that actually works. As fast and simple and high quality as possible. Charge whatever you need to. Stop being a child. Grow up and be a real business.

Для скачивания в p1080 просят денег:(

There's only one person working on this, and they work very diligently to update the code to keep it working. If you're worried about the download not working please be patient, the dev has to consistently update it because youtube keeps trying to block downloading services like this one. Overall this addon works good and I reccommend donating.
The only complaint I have is, why does the addon need permissions to "Access your data for ALL websites"?