Firefox is actually the only software where I've reviewed the privacy settings when asked and allowed it to send more information than the default setting to the vendor.
2. Chances are significantly lower considering that this collaboration started only recently on the new installs from the website. Judging by his comment, I don't think he's a new Firefox user.
Of course, the chance is still there, but I would argue that it's low enough to be negligible, at least for him.
Because Mozilla.