You can get the extension to work on youtube again by downloading the BETA version from here:

downloadhelper.net/w/Beta-versions

I only left 1-star so that other users can see it, I will edit the review later once the issue is fixed.

Era buona prima, ulteriormente migliorata ora! Ne sono molto soddisfatto!

This is to help everyone while they hopefully can get a fix out the for YouTube videos. The extension still works if you play the file through Media Mister. Go there and when you copy the YT link into there and hit download on your quality choice it will play a version of the file in a new window and the toolbar will pick it up for download....I know its a pain but its something for those of you who need it like I do

There is a new issue with youtube, it will be fixed soon. Meanwhile you can try the beta (go to the forum)

this addon sucks, the normal version doesnt work on half of the sites and the beta version does, but when you download something the resulting video has a quarter of it covered with a horrendous qr leading to his page

VERY GOOD

Ha smesso di funzionare

Do NOT buy this. I paid money for it and it was perfect for downloading YouTube videos. It suddenly stopped working. it finds nothing, NOTHING to download.
Completely stopped working without any explanation.

谁用谁知道，强烈推荐

Simple, easy to use and does a great job definitely a useful program.

AweAwesome