rem: mimeTypeIsTextBased : function(contentType) { return /^text\/|\+xml$/.test(contentType) || contentType == "application/x-javascript" || contentType == "application/xml" || contentType == "mozilla.application/cached-xul"; }, 
add: function mimeTypeIsTextBased(aMimeType) { return /^text\/|\+xml$/.test(aMimeType) || aMimeType == "application/x-javascript" || aMimeType == "application/xml" || aMimeType == "mozilla.application/cached-xul"; } 
context:   mimeTypeIsTextBased : function(contentType)  {    return /^text\/|\+xml$/.test(contentType) ||           contentType == "application/x-javascript" ||           contentType == "application/xml" ||           contentType == "mozilla.application/cached-xul";  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/9421/7a91b5c868147b12f471c2f32c72b28777a3a12a/browser.js/buggy/browser/base/content/browser.js