I'll tell you a secret: I'm actually using only MS Edge on my corporate machine. Although some months ago they began to roll-out Firefox as well (for whatever reason).

I don't care. On that machine, there is NOTHING going on that I own (all of that is the IP of someone else).

Such a machine, with Windows, MS Teams, MS Whatsoever, Symantec Whatsoever, Cloud Office, Cloud Ticket System, Cloud Wiki, ..., ..., ... doesn't get more trustworthy just by using Firefox. They run a continuous MitM attack against all https connections that I make (and a lot of your employers do the same)!!! You can polish turds, but you cannot make that environment a trustworthy one.

I would never touch that machine for anything remotely "personal". On the other hand, for work, I don't care. I'll use the default browser, and if the default browser is MS Edge, I'll not spend ANY effort into working around it. That wouldn't be "passionate", but just stupid imho. YMMV of course depending on the employer and other factors.

And if there is a page full of ads, and it overwhelms me too much, well, I'll make a walk to the coffee machine and come back when I'm ready for it. It's that easy.