This is the single best add-on for any browser.
It can separate your activity for a specific site or a set of sites, protecting privacy and security, all the while not being inconvenient in any way.
30 second setup once and of you go!

I love it, I can access multiple accounts with a single browser window!

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best feature that no other browsers offer, i makes everything easy for me to manage multiple accounts, one browser window for all accounts

"Always Open in This Container" feature is awesome! The extension is much more ergonomic to use than the built-in containers.

wish firefox also isolates passwords and not just cookies and browsing data

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it misses a option for add site to be always opened with a container without have to open that site.

This extension is excellent if you own multiple accounts for the same service and want to keep things isolated.

For instance, I have a personal GMail account and a work-only GMail account. It's nice to keep these things separate, because then you can use Single-Sign-On authentication without needing to continuously specify which email account I want to use for signing.

You can also associate certain websites with different containers, so that they are always opened in the appropriate container. Very useful as well, though it can lead to problems when you open the same website in two different containers (for example: I use GMail for both work and personal matters).