Also Mozilla: https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/
Discussion
Yea, but cars don't have a telemetry opt out
As far as i can tell i have opted out of any telemtry for firefox but i still see the domain appearing in my pi-hole a lot. I'm not sure if it's actually (trying to) send any data, and it is also not a single option to disable it all.
The opt-out for your car would be some strategically placed black tape, if there's no software option.
Black tape won't stop the modem from telling your manufacturer or whoever handles the data in between/after, how hard you're braking