rem: return /^text\/|\+xml$/.test(contentType); 
add: return /^text\/|\+xml$/.test(contentType) || contentType == "application/x-javascript" || contentType == "application/xml" || contentType == "mozilla.application/cached-xul"; 
context:   mimeTypeIsTextBased : function(contentType)  {    return /^text\/|\+xml$/.test(contentType);  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/91248424ec155ad4f409eb7addc177ed702d6fc6/nsBrowserStatusHandler.js/clean/suite/browser/nsBrowserStatusHandler.js