I have been using Easy Youtube Video Downloader Express by Dishita for a couple of years now. It is easy to use, and downloads quickly. I have had to uninstall and reinstall a couple of times for some reason when it stopped working, but it is so fast and easy to do, it really has not been a problem, and a couple of times over a couple of years has not bothered me at all. And to be honest, I uninstalled and reinstalled without seeking support, so I may not have needed to. When Youtube changes their algorithms, the developer is right on the ball and updates the add on quickly. I highly recommend this add on.