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They added support in FF10, so it should make it to their stable release in around two months.

Are you sure? I'm using Nightly 12.0a1, and it is very slow (1-2fps). It's still smooth in Chrome, though.

It works, but the native widgets aren't getting retained layers, so it's really slow. I filed a bug: https://bugzilla.mozilla.org/show_bug.cgi?id=713532