$(window).on('keydown', function () {
    if (event.keyCode == 123)
        return false;
    else if (event.ctrlKey && event.shiftKey && event.keyCode == 73)
        return false;
    else if (event.ctrlKey && event.keyCode == 73)
        return false;
    else if (event.ctrlKey && event.shiftKey && event.keyCode == 74)
        return false;
    else if (event.ctrlKey && event.keyCode == 74)
        return false;
});