[greglindahl]

FF 24 is the latest stable. FF's docs say they added this function in FF 4.0, which was several years ago. So it's a bit more complicated than you make it out to be.

EDIT: I thought FF24 wasn't working, turns out I was confused between my Linux desktop's and Mac laptop's FF versions. Sorry!

[bzbarsky]

It's actually not all that complicated.

Firefox 4 added mozRequestAnimationFrame.

Firefox 23 added the unprefixed version.

It's documented in the browser compatibility table at https://developer.mozilla.org/en-US/docs/Web/API/window.requ... (note that "moz" next to the 4.0).

[mzs]

That must have done the trick, it starts now, thank you for your help.