AmIHome will show a red laptop icon when you are local and a black tree when you are on the web. Also the IP address of the site.
Am I Home is an extension that will help you tell at a quick glance whether or not you are working locally by adding an icon to the address bar. No longer will you need to go to the network tab to check. It will display a red laptop when you are local and it will display a black palm tree when you are "away". Also it will display the current IP address of the web requests in the bottom left corner of the site.