High likelihood is that Firefox 5 will start supporting CSS3 Animations. (And if it doesn't, then the animations will certainly appear in Firefox 6.)

WebKit-based browsers (for example, Safari and Chrome) relatively long ago ( at the beginning of 2009 ) supported the features described in the draft of “ CSS Animations Module Level 3 ” and made it possible to easily expose one or another CSS property to cyclic change according to the rules given by the author of the site, and without resorting to JavaScript.

The day before yesterday, April 12, 2011 (on the fiftieth anniversary of Gagarin's flight), patches to bug 435442 “landed” in the mozilla-central repository - thus, support for CSS animations appeared in Firefox.

A little harder to guess exactly which Firefox it appeared. After all, on the same day before yesterday, as we all know , work began on Firefox 6, and the Firefox 5 code moved from mozilla-central to the mozilla-aurora branch . So in Firefox 5, can we expect support for CSS3 Animations, or is it still in Firefox 6?
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There is reason to believe that in Firefox 5 .

I primarily rely on a hand-made comparison of the time of the “landing” of patches to bug 435442 (the corresponding comment on the bug is marked by the time 00:27:05 PDT ) and the time of the appearance of the version of Firefox 6 (the corresponding diff is marked by the time 06:51:00 -0700 - and so As PDT Pacific Time corresponds to “UTC-7”, it turns out that Firefox 6 appeared more than six hours later compared to CSS3 Animations).

In addition, the conclusion (Firefox 5) came on the website "Can I use" .

Dual support now (from both WebKit and Firefox) makes the future of the draft CSS Animations much more radiant than before.