After YouTube's hissy fit with adblock, and their continuous efforts to fight it, somehow that's affected this addon's ability to even detect videos. It no longer works, and obviously there has been no effort on the author's part to fix it.
Edit: Yeah, this addon is a scam, just like "Easy YouTube Video Downloader Express."

quick easy

Easy and fast downloader, the only thing I would like to change how I can add name on thedownload

Super Programm !!!!

Perfect

Very Gooooooooooooooood

excellent and useful! Thank you so much!

excelente aplicación, rápida y eficiente.....

great job