When you try to "npm start" your react app for the first time on Windows 10, it will launch on internet explorer / Edge as default. Do you want to ALWAYS launch on a different browser?
You can simply change your default browser like below: (see this for how to do it step by step with images).
- Navigate to Settings. You can get there from the Start menu.
- Select System.
- Click Default apps in the left pane.
- Click Microsoft Edge under the "Web browser" heading. ...
- Select the new browser (ex: Chrome) in the menu that pops up.
If you want to keep your default browser and "npm start" with another browser, see this thread.