return strcmp(pExt, aExtension);
return PL_strcasecmp(pExt, aExtension);
static int CompareExtensions(const char *aExtensionList, const char *aExtension){  if((aExtensionList == nsnull) || (aExtension == nsnull))    return -1;  const char *pExt = aExtensionList;  const char *pComma = strchr(pExt, ',');  if(pComma == nsnull)    return strcmp(pExt, aExtension);  while(pComma != nsnull)  {    int length = pComma - pExt;    if(0 == strncmp(pExt, aExtension, length))      return 0;    pComma++;    pExt = pComma;    pComma = strchr(pExt, ',');  }  // the last one  return strcmp(pExt, aExtension);}