if (!file.exists()) 
if (!file.exists()) 
function openSafeFileOutputStream(file, modeFlags) {  var fos = Cc["@mozilla.org/network/safe-file-output-stream;1"].            createInstance(Ci.nsIFileOutputStream);  if (modeFlags === undefined)    modeFlags = MODE_WRONLY | MODE_CREATE | MODE_TRUNCATE;  if (!file.exists())     file.create(Ci.nsILocalFile.NORMAL_FILE_TYPE, PERMS_FILE);  fos.init(file, modeFlags, PERMS_FILE, 0);  return fos;}
5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/5459/dd0789ea577a496e2622a164a469a9cb1bcf058d/nsBlocklistService.js/buggy/toolkit/mozapps/extensions/src/nsBlocklistService.js