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Dunno why they haven't modified the browser code since Netscape v.1 ... I guess they have their reasons.
Depending on the number of frames, you might consider loading the individual frames with a setInterval() for timing control to show the animation for Moz users. I assume the animation's pretty short. It's a crappy workaround ... but it does the job.
I haven't tried the StupidScript's suggestion of setInterval() for my individual frames yet. (Yes, that will be a tedious, time-consuming pain...)