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.
}
                        resolve(content);
                      } else {
                        if (__DEBUG__) {
                          console.log(
                            `[main] fetchFromNetworkCache(${debugID}) Invalid content returned by getContent()`,
                            content,
                          );
                        }
                        
                        fetchFromPage(url, resolve, reject);
                      }
                    });
                    return;
                  }
                }
                if (__DEBUG__) {
                  console.log(
                    `[main] fetchFromNetworkCache(${debugID}) No cached request found in getHAR()`,
                  );
                }
                
                fetchFromPage(url, resolve, reject);
              });
            };
            const fetchFromPage = (url, resolve, reject) => {
              if (__DEBUG__) {
                console.log('[main] fetchFromPage()', url);
              }
              function onPortMessage({payload, source}) {