### Website or app

google.com

### Repro steps

This started after last update 4.20.0
![image](https://user-images.githubusercontent.com/11052469/137713404-e6702959-7870-46a6-8566-4cfe61d25309.png)
![image](https://user-images.githubusercontent.com/11052469/137713464-c5e478d2-4e9e-4ee4-abdf-83d23c04704b.png)


### How often does this bug happen?

Every time

### DevTools package (automated)

_No response_

### DevTools version (automated)

_No response_

### Error message (automated)

_No response_

### Error call stack (automated)

_No response_

### Error component stack (automated)

_No response_

### GitHub query string (automated)

_No response_
url,
              value,
            },
          });
        };
        fetch(url, {cache: 'force-cache'}).then(
          response => {
            if (response.ok) {
              response
                .text()
                .then(text => resolve(text))
                .catch(error => reject(null));
            } else {
              reject(null);
            }
          },
          error => reject(null),
        );
      }
      break;
    case 'react-devtools-inject-backend':
      const script = document.createElement('script');
      script.src = chrome.runtime.getURL('build/react_devtools_backend.js');
      document.documentElement.appendChild(script);
      script.parentNode.removeChild(script);
      break;
  }
});
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