Nice extention, thanks! Rated 4 out of 5 stars
I upgraded to Firefox 3 just to make use of this extension. It's nice to see a viable (and free) alternative to animated GIFs. It has all the basic functionality one would need.
That being said, I would recommend the ability to set the frame intervals globally instead of having to change them all individually. Also, the APNG file I create is twice as large (1.1MB) as the folder of PNG files I use to create them (600KB). Is this normal?