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Javascript 1.6 has been available since 2005 (in FF 2.0). Since then we have had quite a few new versions with new features. (Like v1.8.5, only supported in IE9 and FF4.)
Chrome, Opera and others seem to pride themselves by being up to date with the standards; can anybody provide resources or an idea why they have not yet “caught up”?
Built-in array extras and having let/yield would be quite nice.
JavaScript versions are Firefox only code. And it’s a proprietary extension that SHOULD NOT go into JavaScript.
Go read the Ecmascript 5 specification and see what’s actually in the language.
ES5 support table
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