Does not support 1080p or 4k. It's Trash.

Videos are downloaded full of glitches and out of sync, used to be good.

NOT Free!

This add-on doesn't work with Firefox's latest version. It did download Youtube movies but stopped at 99% forever. I tried another add-on called Easy Youtube Downloader Express, which works fast and has good results.

The download icon never appears!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Donne toujours error et ne s'installe pas correcteemnet

Horrível. Não está mais funcionando direito

Probably the best add on there is on Firefox. Awesome!

For many months can't use even 1 time without problems

needs additional app. useless

Does NOT work with YouTube unless you install an EXTERNAL software application (they call it a "companion app"). This is a huge red flag.

EDIT: I changed it from two stars to one. I saw the "companion app" made available on GitHub and ran it through VirusTotal before deciding to install it.

Now, it downloads YouTube videos but re-encodes them (aggregate) which takes about an hour for a five-minute video. Apparently it does this so as to deface the video with a watermark unless you "register" (pay for) a license.

Screw this clown-show.