title: Get the urls of all the tabs in all windows using chrome extension
body: <p>Is this possible for chrome extension to get all the URLs in all tabs using chrome extension ?</p>
  
  <p>I have got the url of current Tab using this code</p>
  
  <pre><code>chrome.tabs.getSelected(null, function(tab) {
      tabUrl = tab.url;
      alert(tabUrl);
  });
  </code></pre>
  
  <p>We need the following permissions in manifest.json file</p>
  
  <pre><code>"permissions": [
      "tabs"
  ]
  </code></pre>
  
  <p>My question is to find out the URLs in all tabs ?</p>