Honestly no, I have a bunch of extensions but I never took specific action to make teams work. You do have to make sure popup are allowed and ublock and similar tools don’t interfere with it, but it worked for me.
You might try grabbing a portable Firefox install from Portable Apps and testing that.
I can try again with a friend on Momday. Is there a specific user agent extension or a about:config option you used?
Honestly no, I have a bunch of extensions but I never took specific action to make teams work. You do have to make sure popup are allowed and ublock and similar tools don’t interfere with it, but it worked for me.
You might try grabbing a portable Firefox install from Portable Apps and testing that.