> This is basically Microsoft using Windows Update to install a desktop icon promoting the latest season of The Voice.

Mozilla have said that this test was meant to be invisible, so whilst this is an accurate analogy of the end result, it's also an accidental one.

> This is basically Microsoft using Windows Update to install...

Asphalt 8, Candy Crush, Keeper (also, see this[0]).

These are the three[1] apps that I had to remove from a laptop purchased last month. They weren't a part of the OEM install, they came with the updates after the system was up and running. Bad example.

[0] https://betanews.com/2017/12/17/windows-10-keeper-vulnerabil...

[1] I think there was one more, but I can't remember its name.

I'd hope they opt out of participating in the shield program?

Then IT probably shouldn't enable Shield studies on their machines.

Enterprises are probably using Firefox ESR (version 52 for the six more months) which still has XUL add-ons, and does not have this problem.

It's documented that Shield studies can be run without prompt for the individual study, no need to assume otherwise. People primarily worried about their privacy should have been worried about the study feature in cases where they'd actually run studies collecting data, not here.