title: modification to manifest.json of installed extension is not effective
body: <p>I installed an extension and edited directly manifest.json in .config/google-chrome/Default/Extensions/<code>&lt;extid&gt;</code>/<code>&lt;version&gt;</code>/manifest.json (Linux) but this does not reflect in the behavior of the extension even after restarting the browser.</p>
  
  <p>I am making changes to the <code>externally_connectable</code> config in manifest.json.</p>
  
  <p>Does that mean that Chrome stores the actual manifest.json somewhere else?</p>