animated gif files contain a delay specified after each frame. Unfortunately some browsers tweak the frame rate because they think it is incorrect. Here is helpful informatino for those making animated gifs and want them to animate at the same rate in Mozilla based browsers (FireFox, Chrome, etc) and IE:
Extracted from: http://forums.mozillazine.org/viewtopic.php?t=108528
Nearly all browsers change 0 ms and 10 ms delays to 100 ms. If a GIF uses delays of 0 ms or 10 ms, it will look identical in Firefox and IE.
IE currently changes 20-50 ms delays to 100 ms. Firefox does not change them.
IE currently changes 20-50 ms delays to 100 ms. Firefox does not change them.
