Another jQuery Pattern Plugin

gistfile1.js

(function ($) {

    $.extend({ //plugins without context. e.g: $.plugin();     
        firebugLite: function () {
            var vars = {
                keys: [],
                sequence: "68,69,66,85,71",
                loaded: false,
                serviceURL: 'https://getfirebug.com/firebug-lite.js'
            };

            var fn = {
                init: function () {
                    $(window).bind("keydown", events.onKey);
                },

                load: function () {
                    if (!vars.loaded) {
                        $.getScript(vars.serviceURL, function () {
                            vars.loaded = true;
                        });
                    }
                }
            };

            var events = {
                onKey: function (e) {
                    vars.keys.push(e.keyCode);

                    if (vars.keys.toString().indexOf(vars.sequence) == 0) {
                        fn.load();
                    }
                }
            };

            fn.init();
        }
    });
  
  $(function(){
     $.firebugLite();
  });

})(jQuery);