rem: normalizedUrl = Components.classes["@mozilla.org/network/standard-url;1"]. createInstance(Components.interfaces.nsIURI); normalizedUrl.spec = aUrl; 
add: var ioService = Components.classes["@mozilla.org/network/io-service;1"]. createInstance(Components.interfaces.nsIIOService); var normalizedUrl = ioService.newURI(aUrl, null, null); 
context:   normalizeHost: function (aUrl)  {    normalizedUrl = Components.classes["@mozilla.org/network/standard-url;1"].                    createInstance(Components.interfaces.nsIURI);    normalizedUrl.spec = aUrl;        normalizedUrl.host = normalizedUrl.host.toLowerCase();    return normalizedUrl.spec;  }
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