You've got to be kidding? The easiest YT downdloader? BS. First of all, this add-on is loaded with advertisements that you have to fight through just to get to the download button, secondly, several other YT downloaders are much easier and work better; namely, YouTube Downloader and Youtube video download. Unfortunately there are many Firefox addons that have the same names as those two, so you'll just have to do some trial and error because I'm too lazy to research the authors of those YT addons that actually work well and easy. Good luck.