title: Enabling and disabling chrome commands
body: <p>I have a command like this:</p>
  
  <pre><code> "commands": {
      "play/pause": {
        "suggested_key": {
          "default": "MediaPlayPause"
        },
        "description": "Toggle Play / Pause",
        "global": true
      }
   }
  </code></pre>
  
  <p>Can I enable/disable it from the extension options page? If I don't use chrome.commands.onCommand.addListener, the shortcut is still active, preventing other programs from using this key.</p>