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Finally achieved empty tcpdump starting Firefox. Had to find and clear location.services.mozilla.com and push.services.mozilla.com from show-all in about:config. Then there were the following that are hard-coded, not appearing in about:config, for which /etc/hosts needed to be invoked:

firefox.settings.services.mozilla.com content-signature-2.cdn.mozilla.net prod.remote-settings.prod.webservices.mozgcp.net content-signature-chains.prod.autograph.services.mozaws.net

FFS do better.

It seems the location.services.mozilla.com probe is otherwise there, even if you turned off location access for websites, so that Mozilla can impose region-specific policies on the browser based on where it thinks you are according to geoip. 🤬

This is based on finding it under browser.region.

What are the chances they're using this to disable something privacy-invasive if geoip says you're in the EU? 🤪