title: How to get tab in TabOpen event with Firefox FUEL?
body: <p>I'm writing a firefox extension and really need to listen on TabOpen events and get some details about tab that was opened. But I can't figure out how do I get an actual tab from <code>event</code> object that my callback receives. Is it somewhere in <code>event.data</code>? Is there a way to inspect this object?</p>
  
  <p>Some code that I have tried so far but it doesn't work:</p>
  
  <pre><code>Application.activeWindow.events.addListener("TabOpen",
      function(event) {
          Application.console.log("TabOpen");
          var tab = event.data.target;
          Application.console.log(tab.uri);
      }
  );
  </code></pre>