Firefox is making connections to cloudfront.net and locprod.prod.mozaws.net on startup
Firefox makes connection to 'locprod1-elb-eu-west-1.prod.mozaws.net' on every start of the browser. After trying to figure out if its caused by one of my addons I tried Safe mode and found out addons ware not the reason but after using Safe mode the browser started making connection and to d2nxq2uap88usk.cloudfront.net on every start too. The only info I have found for 'locprod.prod.mozaws.net' is that its related to geo.enabled but mine is set to False and for d2nxq2uap88usk.cloudfront.net the only thing for it is in block list for SpotifyAdBlock. I have already tried everything on https://support.mozilla.org/en-US/kb/how-stop-firefox-making-automatic-connections .
Why does make Firefox makes those connections? What is transmitted? And How can I disable them?