Yep, only thing it doesn't work well with for me it's teams web (because teams is so boneheaded in that you can't be logged in to two tenants at the same time). Osteen the container tab gets stuck in a reload loop and then the dropped icecream picture "Oops something went wrong".

Not even with two separate containers?

Yeah Teams just refuses to work in either container. Only works properly when it's in the main instance of Firefox.

This is what it was like a while ago though, I haven't tested it recently because I haven't had a need to log in to other tenants anymore since I moved jobs.