In Firefox for Android why don't you warn that Test Pilot does not work?
I like Firefox and downloaded it to my Android tablet (Samsung Galaxy 10.1). I received an email from Firefox suggesting I try Test Pilot. I did so, but it failed to load. No error came up, and no clue as to what was happening - or not happening in my case :( The same thing wasn't happening 2 hours later.
I then tried using my Windows 10 Laptop and instantly got a message saying it was available on Windows, Linux and OS. Android was missing. Fair enough, you haven't developed it yet, but WHY do you not give us poor suckers a clue when trying to download it to Android? "Firefox - designed to be different!" I'd prefer it to be designed to tell meobvious facts about what I'd been invited to download.