add: else if (ex instanceof jsdIValue) ex = ex.stringValue; 
context: function formatEvalException (ex){    if (ex instanceof BadMojo || ex instanceof Error)        return formatException (ex);        return getMsg (MSN_EVAL_THREW,  String(ex));}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/89326cbcdc6feb4eef3ffc00bb488c9640e8dd81/venkman-static.js/buggy/extensions/venkman/resources/content/venkman-static.js