### Website or app

reactjs.org

### Repro steps

1. Install React DevTools v4.20.0 in Firefox
2. Load reactjs.org in Firefox
3. Open Firefox DevTools
4. Observe error in console

![image](https://user-images.githubusercontent.com/1271509/137547605-e6ad3045-c20a-4828-9895-af46b8bb4db1.png)


### How often does this bug happen?

Every time

/**
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow strict-local
 */
declare var chrome: any;
import {__DEBUG__} from 'react-devtools-shared/src/constants';
import {
  EXTENSION_INSTALL_CHECK,
  EXTENSION_INSTALLATION_TYPE,
  INTERNAL_EXTENSION_ID,
  LOCAL_EXTENSION_ID,
} from './constants';
const UNRECOGNIZED_EXTENSION_ERROR =
  'React Developer Tools: You are running an unrecognized installation of the React Developer Tools extension, which might conflict with other versions of the extension installed in your browser. ' +
  'Please make sure you only have a single version of the extension installed or enabled. ' +
  'If you are developing this extension locally, make sure to build the extension using the `yarn build:<browser>:local` command.';
export function checkForDuplicateInstallations(callback: boolean => void) {