From their add-on message on youtube: 1080p/mp3 downloading has been limited to PRO users. Read more at - https://videodroid.org/pro_upgrade.html.

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I absolutely LOVE this add on! I have been using it for years, and it has been a big fan for the whole time. Even when there are changes in the way YouTube broadcasts its videos, the developers of this add on are quick to jump onto it and keep you updated with messages. Brilliant and well worth the PRO version.

requires an upgrade to work.

Very useful and it's worth it going to PRO with a donation. They respond quickly with any questions that i've had. None of the other downloader add-ons seem to work as good as this one.

Excellent plugin. had an issue with it yesterday. Contacted thier support and was resolved with one email. Excellent support as well.

I am getting really tired of this thing forgeting I donated, not once but TWICE! FIX IT!

Super simple and works flawlessly. It's a must have.

I recommend upgrading to PRO.
Quite useful at low cost.
Please note that the specifications for PRO activation have changed recently.
If you can't solve the problem, ask support once and he may help you.
Developer was a good man of feeling. I got a reply

Suele funcionar bien por un tiempo, pero cada vez que se actualiza Firefox presenta fallos y es necesario desinstalarlo y esperar a que actualicen también el add-on.
Adicionalmente, suele presentar algunos errores al bajar videos en 720px. Algunas veces muestra descarga, pero al bajarla resulta que esa versión no existía y lo que hace es bajar el último video que hayas descargado a 360px y sobre escribir el que crees que estás bajando a 720px.
Sin em bargo, es una buena extensión vale la pena probarla y utilizarla.

I use this add-on everyday to get YouTube videos for offline use, I use it to populate my my personal media server [Plex] & to help others with tutorial videos at work. I have the paid version since 2018 it's worth the money for quality 1080p videos.

PRO Upgrade worked for 2 months and stopped working. Submitted problem alert via website and email; Dishita does not even open problem emails or webpage problem feedback - they simply send the same form response to everything - all you get is some useless links and you are left feeling like it's your fault for not fixing Dishita's poor programming.
PRO Upgrade is therefore not worth the price - there is no support whatsoever for any problems.
Zero Stars.

One of the great gifts to the internet. Thank you! Appreciate your communication about the current status each update, and the behind the scenes challenges. Helps us appreciate your work all the more!

It stopped working and the developer moved to a desktop version. Someone reported that the developer is still taking money for the extension. Should be removed and NOT be a recommended Mozilla add-on. Was very good back when it worked.

The add-on is FREE to download, but as soon as you try to actually use it, it tells you you need to BUY the PRO VERSION!!!