Allow posts from beta domain

config.js

function setupConfig() {
  // assume production as origin
  var origin = "https://developer.mozilla.org";
  // get the actual parent origin
  var parentOrigin = window.parent.location.origin;
  // is it the beta domain?
  if (parentOrigin.search(/beta.developer.(mozilla|allizom)/) > -1) {
    // then use it as the origin
    origin = parentOrigin;
  } else if (window.URL) {
    // look for the search param
    var url = new URL(window.location.href);
    if (url.searchParams) {
      var param = url.searchParams.get("origin");
      if (param) {
        // and use it as the origin
        origin = param;
      }
    }
  }

  // finally set the config
  window.ieConfig = {
    origin: origin
  };
}