I’m fairly sure Microsoft is actively trying to screw Firefox. Outlook has always sucked in Firefox, teams is a shit show. When you use a useragent switcher somehow a lot of features seem to work magically in Firefox (which tells me MS is doing this on purpose).
For Outlook (exchange) I use Thunderbird with a paid plug-in (to make the 2FA stuff work). It’s pretty cheap and totally worth it for me at least.
For me definitely steps, I walk 5000 steps on a work day, when I actually have time off its more like 10K steps. I would stop working and just walk with my dog for an full hour every day. Combine that with normal daily stuff I’ll definitely get 10K steps (2500 euros/dollars) every day. That’s almost a million a year.