A quarter century of Mozilla

My understanding (which may very well be out-of-date) is that this is more like Firefox profiles with a completely separate `.mozilla` subdirectory with some helpful selection UI (whereas Firefox profiles are more or less completely oblivious of each other). Firefox containers are allowed to co-exist within a single window and can be for as little as a single website rather than an entire "browser session"

I suspect it works just fine if you use OAuth to separate your accounts, but I try to avoid cross-linking accounts whenever possible.