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.
switch (EXTENSION_INSTALLATION_TYPE) {
    case 'public': {
      
      
      
      checkForInstalledExtensions([
        INTERNAL_EXTENSION_ID,
        LOCAL_EXTENSION_ID,
      ]).then(areExtensionsInstalled => {
        if (areExtensionsInstalled.some(isInstalled => isInstalled)) {
          callback(true);
        } else {
          callback(false);
        }
      });
      break;