Thanks! The video transformations can be a bit time-consuming (especially right now as there is quite a bit of traffic from hackernews) - I'll add a proper load

Thanks! The video transformations can be a bit time-consuming (especially right now as there is quite a bit of traffic from hackernews) - I'll add a proper loader so you can see how much time is remaining. Admittedly I haven't tested much with firefox, i'll check if there is an issue with the download itself.