rem: .createInterface(Components.interfaces.nsISupportsString); 
add: .createInstance(Components.interfaces.nsISupportsString); 
context:     GetNext: function() {        if (!this.hasMoreElements())            return null;        // XXX?        var str = Components.classes["component://netscape/supports-string"]            .createInterface(Components.interfaces.nsISupportsString);        str.data = this.contents[this.index++];        return str;    },
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/2d23e17518afa7ef70447ac234e7b84284167bbf/nsCategoryManager.js/clean/xpcom/components/nsCategoryManager.js