Displays your IP address and country using lookup services of your choice. Auto-refreshes, notifies, and displays.
Also available for Firefox: https://addons.mozilla.org/firefox/addon/public-ip-display/
Public IP Display fetches your IP address and country from an IP service of your choice and displays it in a pop-out panel.
Please check the linked homepage for more complete information. Issues can be filed on the linked support site.