Repository: create-react-app
Issue: BROWSER no longer loads specified browser
Labels: needs triage,issue: bug report

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### Describe the bug

NPM is no longer loading the Browser  (FireFox Developer Edition) I want to use for development purposes.   A long time ago I used to be able to load a specified browser by specifying the browser name in the package.json file like this below......
```

"scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject",
    "dev": "BROWSER=/opt/firefox/firefox HTTPS=true SSL_CRT_FILE=/etc/mkcert/localhost.pem SSL_KEY_FILE=/etc/mkcert/localhost-key.pem react-scripts start"
  },


```
FireFox Developer Edition is called Firefox in Ubuntu and is located in /opt/firefox.  when I run `npm run dev` the regular Firefox browser loads instead.  It's quite annoying because if i type in /opt/firefox/firefox in the command line FireFox Developer Edition loads up.

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This is not the problem

### Which terms did you search for in User Guide?


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BROWSER

### Environment

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Environment Info:

  current version of create-react-app: 5.0.0
  running from /home/aindriu/.npm/_npx/c67e74de0542c87c/node_modules/create-react-app

  System:
    OS: Linux 5.17 Pop!_OS 21.10
    CPU: (8) x64 Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz
  Binaries:
    Node: 17.3.1 - /usr/local/bin/node
    Yarn: Not Found
    npm: 8.3.0 - /usr/local/bin/npm
  Browsers:
    Chrome: 100.0.4896.75
    Firefox: 99.0
  npmPackages:
    react: ^17.0.2 => 17.0.2 
    react-dom: ^17.0.2 => 17.0.2 
    react-scripts: 5.0.0 => 5.0.0 
  npmGlobalPackages:
    create-react-app: Not Found

### Steps to reproduce

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1. In Package.JSON I have the following `"dev": "BROWSER=/opt/firefox/firefox `
2. Type in `npm run dev`
3. Firefox standard edition loads up

### Expected behavior

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FireFox Developer Edition should load, just like it does from the command line.

### Actual behavior

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FireFox standard edition loads up

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Using Ubuntu 21.10 - Having both FireFox and FireFox Developer Edition installed

Create a new React app with `npx create-react-app test-app`.  Say yes to all the defaults when creating the app. 

Install Firefox Developer Edition with this script - change the default language if you want

```
 
echo "Getting latest Firefox Developer Edition........................"
sudo wget -O firefox-dev-latest.tar.bz2 "https://download.mozilla.org/?product=firefox-devedition-latest-ssl&os=linux64&lang=ga-IE"
echo "Going to extract FireFox Developer into its own directory......."
sudo tar -xvjf firefox-dev-latest.tar.bz2
echo "Removing the existing edition of FireFox Developer Edition......"
sudo rm -r /opt/firefox
echo "Moving FireFox Developer Edition to /opt/firefox................"
sudo mv firefox /opt/
echo "Moving the downloaded Firefox Developer Edition to Trash........"
sudo rm firefox-dev-latest.tar.bz2
echo "Disabling firefox Notification.................................."
sudo cp -r distribution /opt/firefox/
echo "All done........................................................"
```


Go into the Package.json file and have the following
```

  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test",
    "eject": "react-scripts eject",
    "dev": "BROWSER=/opt/firefox/firefox react-scripts start"
  },
```
In a terminal in the root of the project folder type... `npm run dev`

Notice how the regular edition of Firefox loads up with your React App.....


Very annoying !
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