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They don't? I've gone as far as disabling all account functionality with about:config and am using containers right now.

Ok maybe it changed or maybe I misunderstood something. I wanted to try this a year or so ago and that was the impression I got.

I've been using containers for years- since at least 2019 - and I've never had a Mozilla account.

This would have been around the time containers were first announced. But again maybe I misunderstood something.