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Re:It’s time to give Firefox another chance by chimeracoder on Friday September 29, 2017 @07:36PM (#15370174)
> It's not quite a new profile since the container retains all your configuration and extensions and a profile doesn't.

Other way around. Profiles retain configuration and extensions between sessions.

Re:It’s time to give Firefox another chance by johnp_ on Friday September 29, 2017 @08:52PM (#15370500)
Profiles: Every configuration change or extension has to be added in every profile to keep in sync manually across different Firefox instances.

Containers: Use the same configuration and extensions across different containers in one running Firefox instance.

Both retain configuration and extensions between traditional browser sessions (start/stop). Containers additionally "retain" configuration and extensions across contextual sessions/identities.