This is a great Mozilla Add-On. I have downloaded many videos in the last 15 months, even 1080p Full-HD ones (before payment was required it). Wish payment wasn't required for it, but, You Tube doesn't really want to cooperate, and, as the originator of the add-on says, "This all is a 'single man job' and I am the only one manning everything from coding, publishing, website, support and debugging." I especially like the built-in download button - keeps me from having to scroll down to access You Tube's button that's below the video frame. He is working hard to keep up with the ever-changing Big-Tech "Masters of the Universe" and their ever-changing plans. Keep using the add-on and be patient with him as he upgrades it and then informs you personally of his progress. Send him at least a cup of coffee.