really useful for web developement, much more convenient than starting multiple browsers in order to use to test a website with multiple accounts at the same time, also now you can sync containers between devices, making it easier to recreate your configuration on a new machine

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.