Baez said:
APNG's are only supported by Firefox and Opera. Nothing else.
ROFL!
Copy and pasted from Wikipedia:
Applications which support APNG:
* KSquirrel as of version 0.7.2 (October 3, 2007)[5]
* XnView as of version 1.92 (December 19, 2007)[6]
* Opera as of version 9.5 (September 17, 2008)[7]
* Mozilla Firefox as of version 3 (June 17, 2008)[8][9]
* Gamani GIF Movie Gear as of version 4.2 (March 2008)[10]
* ImageJ as of version 1.41g (July 3, 2008)[11]
* Imagine as of version 1.0.4 (November 14, 2008)[12]
Applications which do not support APNG:
* Internet Explorer previous to version 8.0.7100.0 (experimental)[13]
* Google Chrome
* Safari