npm start browser
"scripts": { "start": "BROWSER=none react-scripts start", "build": "react-scripts build", "test": "react-scripts test", "eject": "react-scripts eject" },
Source: stackoverflow.com
"scripts": { "start": "BROWSER=none react-scripts start", "build": "react-scripts build", "test": "react-scripts test", "eject": "react-scripts eject" },