rem: var headers, match; 
add: if (!cacheEntryDescriptor) return null; 
context: function getContentTypeFromHeaders(cacheEntryDescriptor){  var headers, match;  if (cacheEntryDescriptor)  {      headers = cacheEntryDescriptor.getMetaDataElement("response-head");    match = /^Content-Type:\s*(.*?)\s*(?:\;|$)/mi.exec(headers);    return match[1];  }  return "";}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/7851b67e333f8b14ea8a636965bab94d9420e92f/pageInfo.js/clean/xpfe/browser/resources/content/pageInfo.js