Rated 4 out of 5 stars
An excellent tool for what it does; it would be better if it had the functionality to directly create animations from other animated formats, i.e. accessing a .avi etc. through it and it rips the frames (just the ones that are different from the predecessing frame to save space as the .APNG is just a little bit bigger than the sum of the original frames) and calibrates the delay per frame to appear just as the original video, except in an image format which has a tiny file size compared to equivalent .avi etc. with crystal clarity. Kudos to Mozilla for this one and as Nuck Chorris sort of said before; this is an excellent system but it should be a standalone program, not a firefox addon.