I am getting it from the simple fact that when I looked at Normandy related settings a unique ID and an API endpoint screamed at me ... Let's assume the explanation given here regarding Normandy's endpoint is legitimate. Why am I assigned a unique ID? How hard is it to make the connection between the fact that for the past N years, despite telemetry and studies being turned off, my browser had been pinging Mozilla with this unique ID. Until proved otherwise, it is safe to assume that this was used to track browsing.

Disclaimer: I work for Mozilla on the operations team responsible for Firefox's backend services, including Normandy.

TL;DR you are not sending us your browsing history.

If telemetry and studies were turned off, your browser wasn't sending us this unique id.

If you had kept them enabled, for normandy telemetry you would have been sending us the data described at https://firefox-source-docs.mozilla.org/toolkit/components/n...

You can read more broadly about what data Firefox sends by default at https://www.mozilla.org/en-US/privacy/firefox/

And learn more about the review process any data collection has to go through at https://wiki.mozilla.org/Firefox/Data_Collection