{
    "prefixes": {
        "feature": {
            "__compat": {
                "support": {
                    "chrome": {
                        "prefix": "-webkit-",
                        "version_added": "10"
                    },
                    "firefox": [
                        {
                            "version_added": "12"
                        },
                        {
                            "prefix": "-moz-",
                            "version_added": "5"
                        }
                    ]
                }
            }
        }
    }
}