I have a couple (e.g spam, uni, personal) and it’s so profoundly unhelpful to make me sign into them one at a time by coordinating between 2 or more different devices. an occasional spot check for security would make sense if I was just booted out of one account, but instead it logs me out of every single one at once?? What gives?
Sounds like Google doesn’t create per-account cookies and uses one cookie set per browser instance, so you’re either logged in or you’re logged out, one account at a time.
Browser containers or profiles might be the answer to what you need.
I’ve been using different Firefox profiles to run accounts in parallel for well over a decade at this point. Containers might be able to do the same thing, but on account of the aforementioned, I’ve stuck with the old way of doing things.
If this is true I wonder the security implications of sharing cookies across multiple accounts?