Very prompt response from developer that willing to solve your issue. Customer service is excellent, they went above and beyond. Super easy to use, works on other sites too.

Ne fonctionne pas.
Doesn't work.

lädt ewig und nichts geschieht. Video läßt sich nicht herunterladen bei mir.

YouTube stuck an add on to the URL and really goofed me up for awhile. After emailing backand forth we got it worked out. You never gave up on me and now it works perfectly. I would recommend this Downloader to everybody. Before YouTube messed with the URL I had been using the Downloader for over a year with absolutely no problems.

Sorry didn't work at all. Download button occasionally shows up after a couple refreshes but its always greyed out and the toolbar button just processes forever. Went through the support steps which mentioned opening in incognito but same problem.

it doesn't work at all

Well maintained add-on. I use it constantly. Being able to pull whole playlists is a great feature. Prompt friendly support.

Maybe it worked in the past, but it doesn't anymore.

There is no "button" or way to start download!?

The button to select what to download doesn't appear, and when I open the add-on directly from the Firefox toolbar, it stays thinking and trying to generate a download link but doesn't do anything.

It does not work.

Ya son varios meses que no funciona, espere a que se solucionara pero no fue así.

Non funziona, non appare nessun bottone per il download

I remember using this a couple years ago and it was great. Doesn't seem to work anymore unfortunately. Doesn't even show the buttons bellow the video as shown in the screenshots (examples).
If this is the #1 downloader for youtube then downloading from youtube is f***ed.