text: chrome.runtime.onMessage.addListener(function(request, sender, sendResponse) {
      if (request.action == 'loadURL') {
          console.log ('once');
          var url = 'http://gettocode.com';
          var newTab = window.open(url, '_blank');
          newTab.focus();
      }
  });
  
  chrome.runtime.sendMessage({action: 'show'});
  
  var s = document.createElement('script');
  s.src = chrome.extension.getURL('script.js');
  (document.head || document.documentElement).appendChild(s);
  
  s.onload = function() {
      s.parentNode.removeChild(s);
  };
  