https://addons.mozilla.org/en-US/firefox/addon/change-geolocation-locguard/
https://addons.mozilla.org/en-US/firefox/addon/location-guard/

https://chrome.google.com/webstore/detail/change-geolocation-locati/lejoknkbcogjceoniealiipllomkpioe
https://chrome.google.com/webstore/detail/location-guard/cfohepagpmnodfdmjliccbbigdkfcgia

https://addons.opera.com/en-gb/extensions/details/change-geolocation-location-guard/