I am creating an extension for Chrome. I want to show an alert() with the page URL whenever the user moves from one tab to another, or when the user enters a new URL in a tab.

This is not working:

chrome.tabs.onUpdated.addListener(function(integer tabId, object changeInfo, Tab tab) {

    alert(changeInfo.url);

});



chrome.tabs.onActivated.addListener(function(object activeInfo) {

    // also please post how to fetch tab url using activeInfo.tabid

});