message: add rel noopener to cross origin loader (currently rel="undefined")
diff: @@ -327,6 +327,7 @@ module.exports = React.createClass({
  // will have the correct name when the user tries to download it.
  // We can't provide a Content-Disposition header like we would for HTTP.
  download: fileName,
  + rel: "noopener",
  target: "_blank",
  textContent: _t("Download %(text)s", { text: text }),
  }, "*");
  