Comment of the add-on, when it should work:
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.
Kicked off.

Payware. EXPENSIVE payware. Does not allow free downloads anymore (and MUST say so in product description). Until they fix that, one star.

Doesn't actually allow you to download, ...anything. Used to work great. Now they require you to pay to play.

Piece of crap software doesn't want to download anything without a paid upgrade

Complemento de pago. No cumple con lo que ofrece a menos que desembolses dinero por algo que no sabemos si va a funcionar o la calidad del mismo.

This app is 100% useless unless you pay for the "pro" edition, all I wanted to do was get mp3 audio and even that is behind a pay gate. Screw you Firefox for recommending this.

Can't do anything useful without money.

Recommended? Why? It refuses to work and informs you that if you aren't a PRO user then you aren't getting squat!

Update 2024/DEC:
Unfortunately, no longer works. :(
(Even the payed version.)
I sincerely hope you will be able to fix the extension. I will update this review to five stars as soon as that happens!
<3

Update 2024/APR:
Still a great, great, great add-on!! Still loving it! :)
I was happy to make a donation, and will donate again.

Update 2022/NOV:
still loving this addon!
Doing exactly what it is supposed to.
You can also download just MP3s.
Keep up the good work!

Add-on actually works. :) As of 05/AUG/2019
In the free version, you can download 360p MP4s. After a one-time payment, higher quality videos and mp3s are available. VERY WELL WORTH IT! Excellent add-on!
Thank you so much!
Lazar

Unverschämte Berechtigungsforderungen. Nein Danke.

Don't bother to download, does not work if you don't pay for the pro version, waste of time here...

I hate when they dont inform users that you have to pay them to get the app to have the funnction at all!

It's nonsense that a "powerful server" is necessary for downloading a youtube video.

I've been downloading for years with other add-ons that don't use another website's "converter".

I downloaded the youtube downloader and it gave me a PDF converter. On top of mozilla disabling my youtube downloader form unknown reasons, your performance is horrible