The Windows Firefox will be removed by an enterprise security suite forced upon you from your IT security. Or bogged down by antivirus. Luckily for us, 99,99% of those corporate security and IT drones have no idea what you can do with wsl.
>>tut-ur+(OP)
What security person in their right mind would remove firefox as a security threat? In my opinion you can make firefox drastically more secure with adblock and tracking blocker addons and better default settings. You'd have to be totally unconcerned with actual security to force everyone into edge. Or maybe there are some draconian incentives at big-corp's that I haven't seen yet.
>>tut-ur+(OP)
There is a portable version of Firefox that so far seems to run everywhere. The benefits you get with a portable browser are quite amazing.
Of course, that limits system integration, but you can still register it as a default browser.