but I still can work fine in Nightly 11.0a1 (2011-12-03) (US).
I got fantastic moviments and pure-smooth (= 60fps + 60Hz + vsync) in lastest version of Google Chrome.
I got a bit lag (pure-smooth "failed" due to 50fps at 60Hz) in any version of Firefox (it supports webGL). Therefore, I don't like Firefox.
Note: Sorry for bad english.