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      1 <script>
      2 // Global accessor that the popup uses.
      3 var addresses = {};
      4 var selectedAddress = null;
      5 var selectedId = null;
      6 
      7 function updateAddress(tabId) {
      8   chrome.tabs.sendRequest(tabId, {}, function(address) {
      9     addresses[tabId] = address;
     10     if (!address) {
     11       chrome.pageAction.hide(tabId);
     12     } else {
     13       chrome.pageAction.show(tabId);
     14       if (selectedId == tabId) {
     15         updateSelected(tabId);
     16       }
     17     }
     18   });
     19 }
     20 
     21 function updateSelected(tabId) {
     22   selectedAddress = addresses[tabId];
     23   if (selectedAddress)
     24     chrome.pageAction.setTitle({tabId:tabId, title:selectedAddress});
     25 }
     26 
     27 chrome.tabs.onUpdated.addListener(function(tabId, change, tab) {
     28   if (change.status == "complete") {
     29     updateAddress(tabId);
     30   }
     31 });
     32 
     33 chrome.tabs.onSelectionChanged.addListener(function(tabId, info) {
     34   selectedId = tabId;
     35   updateSelected(tabId);
     36 });
     37 
     38 // Ensure the current selected tab is set up.
     39 chrome.tabs.getSelected(null, function(tab) {
     40   updateAddress(tab.id);
     41 });
     42 </script>
     43