Oh, and you can do that even in the official application? I thought it was impossible to be logged into multiple Teams accounts at the same time! (That was one of the reasons I was using Teas in a browser, being able to open another instance in a private window.) Or did they finally fix that, at least?
Access Teams? Do you need anything more than opening the Teams web app in a browser?
uMatrix browser extension. It has been marked archived by Gorhill, last release is two years old, you are supposed to just use uBlock [Origin]. However, it still (luckily) works fine and is exactly what I want. (Sure, I won’t install this for my parents.) The GUI to simply choose what you want the site to be allowed to do is perfect.
It’s not as easy as it sounds, sometimes the screens are all wrong!! https://xkcd.com/722/