If you have more than one copy of React DevTools installed and enabled (e.g. the version in the Chrome store and a locally built version) they can interfere with each other.

DevTools should detect this case and warn by showing a dialog in the DevTools UI and/or by logging to the console.

Note that we _should not warn_ if a related tool like Fast Refresh is present, only another copy of DevTools.
if (panelCreated) {
    return;
  }
  chrome.devtools.inspectedWindow.eval(
    'window.__REACT_DEVTOOLS_GLOBAL_HOOK__ && window.__REACT_DEVTOOLS_GLOBAL_HOOK__.renderers.size > 0',
    function(pageHasReact, error) {
      if (!pageHasReact || panelCreated) {
        return;
      }
      checkForDuplicateInstallations(hasDuplicateInstallation => {
        if (hasDuplicateInstallation) {