It says nothing about spyware, the article isn't hyped up at all, and describes a token to track installations vs downloads.
"This data will allow us to correlate telemetry IDs with download tokens and Google Analytics IDs. This will allow us to track which installs result from which downloads to determine the answers to questions like, "Why do we see so many installs per day, but not that many downloads per day?"
Also there is an opt-out during installation.
I don't even use Firefox, and I honestly am not attacking but your comment seemed very hyperbolic and with little detail.
You're right that it's good to be aware of this stuff, I also don't see this being a road block for the average user.
I use simplelogin but mostly I still use an email that provides aliases. I break things up into five or six main groups. Content like games and streaming, shopping, social media, and a few others. This works as a general grouping for bookmarks, passwords, note taking, and emails.
I felt using a simplelogin alias for every site was out of control. For me personally I just need it a bit simpler.