You probably missed the news.
No I did not, but did you ever stop to wonder why there is so much anti Firefox propaganda, as Google is trying to prevent ad-blockers?
Manage technical and interaction data collection settings in Firefox:
https://support.mozilla.org/en-US/kb/technical-and-interaction-data
What is technical and interaction data?:
https://support.mozilla.org/en-US/kb/technical-and-interaction-data#w_what-is-technical-and-interaction-data
information about how Firefox functions on your device and how you use its features. This includes performance details like page load times, and memory usage, as well as insights into which Firefox features you interact with, such as bookmarks, tabs or settings. Additionally, it collects general device information, including your operating system, browser version and hardware specifications. Mozilla uses this data to enhance Firefox while respecting your privacy.
There is zero, zip, zilch, nada personalo info collected.
So please point out to me which of these it is that worries you?
Also please point out which of these it is you think Mozilla would be able to sell?
Firefox is becoming a data seller too.
I think that technically that is libel!