This is the one I like most from what is available for the job. But my Avast finds it 'unreputable' and wants to remove it.

Love! Gives you lots of options for slow connections and worked instantly. Also keeps the original name of the film.

High quality (320kbps) downloads. I love it.

Works, but slow and opens annoyng ads of different crap in other windows.

Does not work.

καλη εφαρμογη

Doesn't work
Most of the time it fails to open the dialogue box for the save destination, but when I am able to save the file, there is only sound, no video.

Opens an external page for the download which takes time to process and provide download links, and when clicking the links ads open.

Cette extension affiche une popup de pub dont il est impossible de se sortir sans relancer Firefox. Et je soupçonne un malware derrière la pub.

Easily downloads everything you need from youtube. Love it!

Works fine for me and easily allows me to download and convert all that I need.

WHY THIS GUY SAY THIS? Its true?
>This extension uses the Coinhive miner to use your PC to Mine crypto currency for them without your permission.
And why in my phone i can download, but in my pc i cant see the red panel for download...

2.5 stars because it works. But every time I use it it opens a really annoying, dangerous looking spammy ad site and makes a really annoying beeping sound that tells me there are viruses on my computer and has a button to clear them. That's really a no-no. If you want to get malware on your system that's a good way to do it. The website that converts the videos to mp3s is also really slow to download from. So I'm removing it from my computer and looking elsewhere. I'd be willing to pay for an add-on that just does the job without all the annoying and possibly dangerous ad sites that pop up. It's a shame that the developers took the underhanded sleazy approach to monetizing their work. They have a donation button, and I would certainly donate if not for that. The slow download speed is a minus too, but nothing compared to the awful ad pop-unders.

Je viens de testé cette extensions ,et formidable de trouvé un mode de téléchargement rapide ,simple et en plus le choix d'avoir du 320 Kbs, merci au développeur .

Very convenient and easy to use, just add to Firefox and start downloading from youtube right away, no need to restart browser, compatible with quantum. Great one