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How is location shared without using GPS?

Browser pop-up asking if I'd like to allow google.com to access my location

How does location sharing work when my computer doesn’t have GPS?

If I open my laptop to Google Maps and allow it to access my location, it returns my location to within 20 meters! How can that possibly work without GPS?

Clicking Learn more in the above pop-up tells me (emphasis mine):

By default, Firefox uses Google Location Services to determine your location by sending:

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