This is a great post by Jon about Firefox Containers and the power they can hold.
I lazily use them as a way to have i.e. multiple email accounts logged in, or at work having several AWS accounts logged in at once but have also got some pieces in place to containerise certain privacy-infringing companies' attempts to track me.
Recommended read: Preaching about Firefox Containers (and how they can change your Internet life) https://jon.sprig.gs/blog/post/1137
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