Really useful, it improves your productivity avoiding to open different browsers or profiles.

Completely indispensable!

Amazing!!

This is a great tool to use when you want different tabs for different stuf.

Multi-Account containers is a feature that sets Firefox completely apart. It has become central to my workflow and I can't imagine browsing the web without it.

Very useful and powerful tool for privacy. It would be nice to have the ability to manage also sub-level domains for every container with wildcards.