title: What is "content_capabilities" field in chrome extension's manifest file?
body: <p>I've searched Chrome Extension manifest document docs(<a href="https://developer.chrome.com/extensions/manifest" rel="nofollow noreferrer">https://developer.chrome.com/extensions/manifest</a>), there's a &quot;content_capabilities&quot;, but no link for that.</p>
  <p>I infer it giving &quot;permissions&quot; to the &quot;matches&quot; as below.</p>
  <pre><code>  &quot;content_capabilities&quot;: {
        &quot;matches&quot;: [ &quot;https://docs.google.com/*&quot;, &quot;https://drive.google.com/*&quot; ],
        &quot;permissions&quot;: [ &quot;clipboardRead&quot;, &quot;clipboardWrite&quot;, &quot;unlimitedStorage&quot; ]
    },
  </code></pre>
  <p>but whenever I try to use this format in my local sample extension, I get this error.</p>
  <p><code>'content_capabilities' is not allowed for specified extension ID</code></p>
  <p>Is this format able to use in general users?</p>