Have found this extension invaluable in helping to learn from some of the you tube videos. I download to be able to peruse as I wish rather than try and find them on you tube again each time.

You can download videos from Youtube. By making a donation, you can also download high quality videos. 720p and other high quality videos can now be downloaded, so I am very happy with the quality. The functions are easy to understand. I recommend it to everyone.
※I'm using translation site because I'm Japanese.

Youtubeから動画を落とせる。寄付をしてプレミアムになることで720pなどの高画質の動画も落とせる。高画質の動画を落とせるようになって、とっても満足♪機能もわかりやすく使いやすい。みんなにおすすめ♪

es una extensión que merece bastante la pena , ya que normalmente funciona bien

Works great! Cool addon with regular updates ;-)

Рекомендую! Самое лучшее дополнение для скачивания видео с Ютуба!

I do not use 'very' often, but when I do it seems to work great!
For my needs = 10/10
RECOMMENDED!

This has been my go to down loader. I support the Firefox mentality. I hope that the new version will now allow us to download the latest Youtube videos.

720p download works great, haven't tried the paid Pro option for 1080p but nice to have a choice.

very usefull extention for downloading videoes of youtube. I use it for several years now. I recommend

Works reliably as expected. Thankful for the work.

very useful to transcribe music with better apps than youtube

I really enjoy this add-on, I have been using it for several years and it has rarely failed me!

Fino ad ora è il miglior programma che abbia trovato.

Hyvä lisä Youtubeen, on aina minun Firefoxissa.

Very useful and intuitive!

++++

Excellent add on. It's reliable and very easy to use.