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Flagfox is an extension for Mozilla Firefox that shows a flag icon, either in the status bar or in the address bar, indicating the current website's server location. It uses relatively little resources, and works by accessing an IP address database contained within the extension rather than relying on top-level-domain roots like ".com" or ".uk". Clicking the icon loads Geotool, which provides a map of the location as well as more information such as the ISP and city. The context menu also provides quick access to information about the country of origin, as well as the ability to lookup the site's registrant via Whois. Since Flagfox 3.3 it is also possible to add a custom lookup to the context menu.

Uses of Flagfox range from simply educating users about the global nature of the Internet to:
* SEO and web development research
* Indicating the native languages and legal jurisdictions for webservers
* Warning when sites that are not in the country the say they are
* Quickly viewing/copying server IP addresses for diagnostic and other uses

Flagfox is fairly customizable, allowing users to choose between two icon sets with positioning options anywhere in the address or status bar. Advanced users may create their own custom lookup to perform specialized searches for the current server.