
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.
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