processLoader = () => {
  // select loader and change message in text node
  const header = document.getElementById('loader-header');
  header.innerHTML = loaderHeaders[Math.floor(Math.random() * loaderHeaders.length)];

  // If React isn't found, notify the user
  setTimeout(() => {
    if (document.getElementById('loader-header')) header.innerHTML = '';
    if (document.getElementById('loader-sub-header')) {
      const subHeader = document.getElementById('loader-sub-header');
      subHeader.innerHTML = errorMessage;
    }
  }, 10000);
}
Appends the loading screen with a random quote.

The loader is removed when / if the tree is drawn,
after data has been received from the inspected page.
After 10 seconds, it will show an error, indicating it could not find React's root node