CIRCLE WITH A DOT

@masek
I feel your pain.
My solution to this madness are browser profiles. I currently have 4, two are signed in to different Microsoft accounts, one is for mastodon and one is default which receives all "open webpage" requests from other apps and this one is set up so it erases all browsing information on close. There is also a little configuration magic that redirects web page open to the right tab where e.g. newspaper subscriptions live. Whenever I need to sign in to yet another MSA or M365, I use a in private window to keep it separate.