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JavaScript

var isPPAPI = false;
var type = 'application/x-shockwave-flash';
var mimeTypes = navigator.mimeTypes;

var endsWith = function(str, suffix) {
    return str.indexOf(suffix, str.length - suffix.length) !== -1;
}

if (mimeTypes && mimeTypes[type] && mimeTypes[type].enabledPlugin &&
   (mimeTypes[type].enabledPlugin.filename == "pepflashplayer.dll" ||
    mimeTypes[type].enabledPlugin.filename == "libpepflashplayer.so" ||
    endsWith(mimeTypes[type].enabledPlugin.filename, "Chrome.plugin"))) isPPAPI = true;

alert("PPAPI enabled: " + isPPAPI);