By default, Microsoft gets to see your location, keystrokes and
browser history – and listen to your microphone, and some of that stuff
is shared with “trusted [by Microsoft, not by you] partners.”
You can turn this all off, of course, by digging through screen after
screen of “privacy” dashboards, navigating the welter of tickboxes that
serve the same purposes as all those clean, ration-seeming lines on the
craps table: to complexify the proposition so you can’t figure out if
the odds are in your favor.
Oh, and if you’ve already chosen to use Firefox as your default browser, Microsoft overrides your decision
when you “upgrade” and switches you to the latest incarnation of the
immortal undead monster formerly known as Internet Explorer.