this.addClass("XMLSerializer","@mozilla.org/xmlextras/xmlserializer;1", ["nsIDOMSerializer"]);
this.addClass("ZipReader", "@mozilla.org/libjar/zip-reader;1", "nsIZipReader", "open", false);
this.addClass("ZipWriter", "@mozilla.org/zipwriter;1", "nsIZipWriter", "open", false);
this.addClass("XMLSerializer","@mozilla.org/xmlextras/xmlserializer;1", ["nsIDOMSerializer"]);
this.addClass("ZipReader", "@mozilla.org/libjar/zip-reader;1", "nsIZipReader", "open", false);
this.addClass("ZipWriter", "@mozilla.org/zipwriter;1", "nsIZipWriter", "open", false);