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];  }}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/a32deaaa0c48e0a4f9d913deba3c11be6f38ac98/pageInfo.js/clean/browser/base/content/pageInfo.js