FlagFox II is based on the original FlagFox extension by Joseph Birr-Pixton. FlagFox displays a flag of the current server's location. For example, if you went to Google, you would notice the American flag, meaning the server is located in the U.S. (duh!) :-).
If you click on the flag, if will take you to Wikipedia or GeoTool, which uses a geolocation tool to pinpoint where the IP address of the website is located.
According to the site:
Notes: FlagFox uses no additional network resources. It does one DNS lookup which is guaranteed to be a local DNS cache hit. All images and the mapping database is kept in the extension (which is why the extension is so large!).
Large indeed! The extension is over 750K and it takes up 27 megs of memory. Although the extension has some girth to it, I'm debating as to whether the memory footprint of the extension justifies the use of that little graphic on the status bar.
Rating: I'm giving it a 3 out of 5.