I use profiles for this, I wonder what the tradeoffs are between the two approaches. I've actually been thinking about building some tools to make it easier to create and manage profiles on the fly. For me I really think profiles are better since the boundaries are harder - there's no worry about accidentally hitting the "log in with Google" button and clearly identifying myself to a site or similar, because I read the news in a separate profile from my Google account. And it would be nice if those sort of guardrails were very intuitive and easy to set up by default. But I feel like containers may be too squishy.

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