I'm using this addon now for around 1 year.
And from my experience it is the best youtube downloader that supports the Addon DownThemAll

It works perfectly fine, has a nice design that looks good even in Dark-Mode in Youtube and I can't complain about the download speed (even for 1080p downloads, and yes, I donated.)

I'm not using it to download music so I can't say anything about that,
but I hope it will support Firefox 56.0.2 for a long time.

I found this video downloader software to be excellent in every way ! It is very easy to operate and downloads videos very FAST !! If people out-there using this app are having difficulties, it might be that they need more memory to boost the speed of the app. ---I'm happy I donated money for this non-profit project. It is well worth it. Do Not be discouraged -- this is a wonderful app !! KEEP UP THE GOOD WORK !!!

amazing;)

The best YouTube down loader on the net!

Its downloading feature is just awesome

thankyu

Just what I was looking for... Works great.

Works well, easy to use, worth a donation

It works. I have not had any real problems.

El mejor.

Works as described - fast and efficient. I donated €10 and the process via Paypal was straightforward and secure.

Very useful add-on. I donated for the full version and months later it stopped working due to a browser upgrade or something like that. I contacted the maker and he helped me out. I was very pleased with his timely response and help sorting it out, on top of how useful this is.

nice

Nice Application

very good addon

Fantastic. Saves so much time by downloading and skipping ads.

Wonderfull addon, thank you.