### 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_
'use strict';
function welcome(event) {
  if (
    event.source !== window ||
    event.data.source !== 'react-devtools-content-script'
  ) {
    return;
  }
  window.removeEventListener('message', welcome);
  setup(window.__REACT_DEVTOOLS_GLOBAL_HOOK__);
}
window.addEventListener('message', welcome);
function setup(hook) {