title: Web App Manifest not parsed by Chrome Dev Tools
body: <p>I have a <a href="https://incredibleweb.github.io/pwa-tutorial/" rel="nofollow noreferrer">manifest.json</a> according to the <a href="https://developer.mozilla.org/en-US/docs/Web/Manifest" rel="nofollow noreferrer">MDN spec</a> and while it works correctly when browsing the website from a mobile device (add to homescreen popup shows up, theme color and icons load...etc) Chrome Dev Tools is unable to parse it. The same problem persists on Lighthouse (chrome extension).</p>
  
  <p><a href="https://i.stack.imgur.com/2R31b.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2R31b.png" alt="Chrome Dev Tools unable to parse manifest.json"></a></p>
  
  <p>Has anyone seen a similar issue? I would think that the JSON is invalid however copy-pasting into <a href="https://manifest-validator.appspot.com/" rel="nofollow noreferrer">Web App Validator</a> it is marked correct, but when inputting the URL it giving a parse error:</p>
  
  <p><code>File isn't valid JSON: SyntaxError: Unexpected token  in JSON at position 0</code></p>