Find all the custom properties created in the window object. Very useful to debug or reverse engineer a web app.

custom-window-properties.js

(() => {
  let results;
  let currentWindow;
  let customizedWindow = {};
  let iframe = document.createElement('iframe');
  iframe.style.display = 'none';
  document.body.appendChild(iframe);
  currentWindow = Object.getOwnPropertyNames(window);
  results = currentWindow.filter(function (prop) {
    return !iframe.contentWindow.hasOwnProperty(prop);
  });
  for (const result of results) {
    customizedWindow[result] = window[result];
  }
  console.log(results);
  window.customizedWindow = customizedWindow;
  console.log(customizedWindow);
  document.body.removeChild(iframe);
})();