[apex_sloth]

Side note: Teams works for me in firefox on linux if I change the UserAgent with this add-on:

https://mybrowseraddon.com/custom-useragent-string.html

For these urls

https://teams.microsoft.com/ https://statics.teams.cdn.office.net/

To Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36 Edg/85.0.564.51

[jwells89]

Changing the user agent seems to make things work more often than not in the case of sites/apps like this. My inclination is that most of them don’t actually have hard browser requirements and just haven’t been tested against anything but Chrome and the devs (or those managing them) would prefer to not change that.

[jcul]

It seems to work for me on FF / linux out of the box, without any user agent change.