Type about:preferences#privacy<enter> in the address bar. Turn off the options under Tracking.

What does this webpage say about your location? http://whatismyipaddress.com/

On Windows XP? Unless your computer has a GPS antenna, Firefox may not be able to provide much more information about your location than websites can derive from your IP address. (They don't need permission to look up your IP address in services that map them to your service provider's location.)

See also:

• Geolocater: https://addons.mozilla.org/firefox/addon/geolocater/

Edward27821 said

This is about tracking cookies, isn't it? And the link just shows the ip-address and location of your ISP server.

What is causing the problem is unknown until it goes away. The link shows the information available.