title: Can a Chrome extension get information about a connection?
body: <p>I want my Chrome extension to collect information about how the current browser <a href="https://developer.chrome.com/extensions/tabs#type-Tab" rel="nofollow">tab</a> negotiated its secure connection.</p>
  
  <p>In particular, I want to know the protocol and the cypher/auth &amp; key exchange mechanisms used in the HTTPS connection: <code>SSL3</code>? <code>TLS 1.2</code>? And those ugly strings like <code>AES_128_GCM</code> or <code>CHACHA20_POLY1305</code>, <code>ECDHE_RSA</code> or <code>ECDHE_ECDSA</code>.</p>
  
  <p>Is this even possibile?  </p>
  
  <p>Within the <a href="https://developer.chrome.com/extensions/api_index" rel="nofollow">API index</a>, the best fitting module seems to be <a href="https://developer.chrome.com/extensions/webRequest" rel="nofollow"><code>chrome.webRequest</code></a>. But I can't see any means to gather connection data. Am I missing something?</p>