title: Enable CORS for Chrome Extension
body: <p>I use Fetch API (Javascript) in a Chrome Extension to retrieve a .json from my server.
  The request can't be submitted due to <a href="https://i.stack.imgur.com/OQzS3.png" rel="nofollow noreferrer">Chrome CORS - Preflight Error</a> &lt;- Error Screenshot
  <br><br>
  How can I enable CORS when my client is a Chrome Extension? </p>