rem: return listener.onStartRequest(this, ctxt); 
add: throw Components.results.NS_ERROR_NOT_IMPLEMENTED; 
context: function bc_asyncRead(listener, ctxt){    return listener.onStartRequest(this, ctxt);}
meta: 3298	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/3298/6981f579a799a305ba5d9bf89cae81e360903b28/chatzilla-service.js/buggy/js/lib/chatzilla-service.js