JSON - JavaScript | MDN

The JSON object contains methods for parsing JavaScript Object Notation (JSON) and converting values to JSON. It can't be called or constructed, and aside from its two method properties, it has no interesting functionality of its own. Description JavaScript and JSON differences JSON is a syntax for serializing objects, arrays, numbers, strings, booleans, and null. It is based upon JavaScript synta

[yamadar]

Firefox が JSON にnative対応したのはFF3.5から。

[nilab]

Using native JSON - MDC Doc Center