For those who are PDF adverse, an overview,
https://www.theregister.co.uk/2020/02/2 ... acy_shame/.
So your browser spies on you.
Go figure.
Worst, I suppose, for Mozilla users, is that FF & Chrome (& Safari) are grouped together.
So for all those Chrome (i.e., Google) haters... FF users can join the club.
And, my impression, is that many (Edge) users are under the impression that Edge is "cleaner" then Chrome (they're Chrome, i.e., Google haters, remember), so they've chosen Edge as an alternative. (And as it turns up [per pdf], Edge is worse then Chrome [in spying on you]
.)