### Website or app

reactjs.org

### Repro steps

1. Open a website that uses React.
2. Inspect an element that uses Hooks.
3. Attempt to load hook names.
4. Loading hook names always fails:

![image](https://user-images.githubusercontent.com/1271509/137997605-a3f601a9-59e5-4370-b307-3ff50af22cae.png)

if (source === 'react-devtools-content-script') {
                  switch (payload?.type) {
                    case 'fetch-file-with-cache-complete':
                      chrome.runtime.onMessage.removeListener(onPortMessage);
                      resolve(payload.value);
                      break;
                    case 'fetch-file-with-cache-error':
                      chrome.runtime.onMessage.removeListener(onPortMessage);
                      reject(payload.value);
                      break;
                  }
                }
              }
              chrome.runtime.onMessage.addListener(onPortMessage);
              chrome.devtools.inspectedWindow.eval(`
              window.postMessage({
                source: 'react-devtools-extension',
                extensionId: "${CURRENT_EXTENSION_ID}"
                payload: {
                  type: 'fetch-file-with-cache',
                  url: "${url}",
                },
              });
            `);
            };