Dear Mozilla, you have no business having my data in the first place. If you're promising to keep my data safe, things have already gone wrong.
???
Mozilla doesn't have your data.
The only way Mozilla would ever have any of your data is if you explicitly signed up for one of their services to hold your data for syncing purposes or something.
Unless you very actively said "Take my data please!" at some point, there really are very few things Mozilla would be able to do to get at your data. (In fact, by far the easiest thing for them to do would be to forget about using firefox and just buy the data from Facebook or Google.)
That is not my definition of explicitly signing up for their services.
What about bug reports?
I’m just curious if the line is “absolutely no data” or “nothing identifiable to me or my habits”, or something else.
Unless, of course, I explicitly instruct the browser to connect there, which is unlikely, because I don't want anything to do with them or with their services.
If it is enabled by default, then they are doing it wrong.
That's just your opinion. Mozilla should be very clear, up front, about what data they collect by default[1], so that users can make educated decisions about whether to allow it. This whole "we promise to protect everything (lol) we collect about you" PR stunt obscures the fact that they are collecting data from users by default.
1. They 'detail' it in the privacy policy, but 1) almost all end users will not see a link to it and 2) almost all end users will not consider that Mozilla is collecting data from them by default.