gecko-dev/layout/style/test/bug732209-css.sjs

function handleRequest(request, response) {
  // First item will be the ID; other items are optional
  var query = request.queryString.split(/&/);

  response.setHeader("Content-Type", "text/css", false);

  if (query.indexOf("cors-anonymous") != -1) {
    response.setHeader("Access-Control-Allow-Origin", "*", false);
  } else if (
    query.indexOf("cors-credentials") != -1 &&
    request.hasHeader("Origin")
  ) {
    response.setHeader(
      "Access-Control-Allow-Origin",
      request.getHeader("Origin"),
      false
    );
    response.setHeader("Access-Control-Allow-Credentials", "true", false);
  }

  response.write(
    "#" +
      query[0] +
      " { color: green !important }" +
      "\n" +
      "#" +
      query[0] +
      ".reverse { color: red !important }"
  );
}