Disabling opening of the browser in server start

Created by: sheerun

While "cool":

1. I already see what to open in terminal, I don't need script to open it for me
2. I restart the server often, and end up with multiple tabs in browser opened
3. Every time I start server I loose my terminal context.. and my flow becomes:
   • npm start
   • tab away from the browser
   • open file to edit in terminal
   • switch to browser again

Could we disable auto-opening of browser window? Or at least in non-interactive mode?