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Re:The State of JavaScript - Brendan Eich by simanyay on Tuesday October 09, 2012 @11:23AM (#4632001)
Firefox already ships with some (most?) of these features.
Re:The State of JavaScript - Brendan Eich by masklinn on Tuesday October 09, 2012 @04:19PM (#4633714)
And according to [0], Chrome apparently has some (most?) of these features locked behind a big flag (seems to be "Enable Experimental JavaScript" in about:flags, no idea what's implemented though)

edit: http://kangax.github.com/es5-compat-table/es6/ considering the sea of red, it's rather clear that both Firefox and Chrome only implement some ES6 features (note: this crashes Chrome 22 after enabling "experimental javascript", which may explain the big flag, and the latest Firefox 16 improves quite a bit on the listed Firefox 13: adds const, default params, rest params, proxies and all the new Number functions)

[0] https://news.ycombinator.com/item?id=4633069