Flagfox is a Firefox add-on that lets you see the country where the website you are visiting is hosted by displaying the country's flag in the address bar.
By clicking the flag, you can get more detailed information about the server's location. If you click with a mouse wheel, you can see Whois information for the website you are visiting. This action may change in the add-on's preferred window.
You can change the settings collected by Add-ons and various settings as its appearance. For example, you can choose between two different sets of flag icons. You can display the address bar or the status bar, or the left, right or the big right flag.
All this makes Flagfox on an interesting add-on.