Working much better for me that other Firefox video-downloading addons, so far (even ones that work really great in their Chrome versions). I'm not certain if this green-icon Video Downloader Professional is from the same maker as the one that looks just like it for Chrome, but that one also works well (in Chrome and related browsers, I mean). No addon of this sort is a magic bullet; they all have sites they won't work on. So, it's best to have 5 or so of them; odds are one of them will work at whatever site you are at.