Wow, this add-on is a beast! It downloads full HD videos with the sound, which other add-ons can't do unless you pay up first. One of the most popular add-ons, whose name I better not mention here, 'aggregates' the video and sound streams (by joining them together?) and then I find out the video has not been even recorded in FHD, then asks me to pay to remove the watermark. Are you kidding me? What a joke! But Ant Video Downloader saves my life, downloads FHD videos from Youtube perfectly, and best of all, it is FREE!