Mozilla firefox not working with window.onbeforeunload

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Here is working solution for Firefox and Chrome. I haven’t yet tested in Safari and Opera.

var myEvent = window.attachEvent || window.addEventListener;
var chkevent = window.attachEvent ? 'onbeforeunload' : 'beforeunload'; /// make IE7, IE8 compitable

myEvent(chkevent, function(e) { // For >=IE7, Chrome, Firefox
    var confirmationMessage="Are you sure to leave the page?";
    (e || window.event).returnValue = confirmationMessage;
    return confirmationMessage;
});

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