Was cooerced to write this revue by CONSTANT nag screen to do so. It works - not as well as the add-on I prefer but with Mozilla now being broken for many of the add-ons it needs to work, this was the only alternative I could find. It works a lot of the time but many times, it posts a HUGE watermark across the downloaded video unless you pay for a highly overpriced converter too. I'll be dumping this add-on as soon as I find a workable alternative or Mozilla gets their act together and fixes Firefox. I'd have been glad to pay a fair price but what they ask - plus the constant nag screens - makes me VERY unhappy with it. Enough said.