> From what I remember, it's not addon-users, as most users never have used even just a single addon.
If most users who install Firefox do so for superior adblocking and those same users are also very likely to turn off telemetry (which I think some privacy/adblock extensions probably do by default?), then at Mozilla's end one might get the impression that "most users don't use extensions" - even though the vast majority of users do.
So to answer the questions of:
> Who is Mozilla's core audience?
It's probably the kind of user that has telemetry off. You don't know much if anything about them.
Update-checks are not included in telemetry. And I would think most people using addons still do update their addons from time to time, or even have the auto-check active. There is also the download-stats from their server-side, so I would think they do have a good enough picture of their numbers. Might be they could be 10% off, but surely are there not tens or even hundreds of millions of stealth-users around.
> It's probably the kind of user that has telemetry off. You don't know much if anything about them.
Don't think so, most people don't give a f** about this. Tech-people on that level are even in the industry a minority. And on the other side, those stealth-users are worthless for Mozilla, because they can't make money from google with them. So for a project needing to make money with usersnumbers, everyone who is out of this, isn't core audience anyway.
> It's probably the kind of user that has telemetry off.
If less than 4% of users use uBO, which the kind of users you're referencing claim is the primary reason they use Firefox, I doubt many users disable telemetry either.
I believe some Linux distributions patch Firefox to change default settings including disabling telemetry. Probably not a big factor, but still something to think about.
If most users who install Firefox do so for superior adblocking and those same users are also very likely to turn off telemetry (which I think some privacy/adblock extensions probably do by default?), then at Mozilla's end one might get the impression that "most users don't use extensions" - even though the vast majority of users do.
So to answer the questions of:
> Who is Mozilla's core audience?
It's probably the kind of user that has telemetry off. You don't know much if anything about them.