Coming from Chrome, where I used profiles to separate work browsing from personal browsing, I find this very useful.

I really like this add-on. It would be perfect if we had the option to 'lock-down' a container of choice, in the same way that Facebook Container is locked-down.

Works great, but sometimes I forget that when I log in on a Google account for a different website I need to open my separate tab.

Easy and straightforward way to keep different browser contexts separate.

Easy to use, Very effective. An essential add-on.

this works great

Extremely useful feature.

Very useful and simple to use. I think I like it better than Chrome's profile switching.

A must have. I've switched all of my multi-profile activity from Chromium (not my preferred browser) to Firefox (my preferred and favorite browser) Multi-Account Containers, finding it much more useful, handy and, especially, resource efficient. Keep it up, Mozilla!

Simply exceptional. This add-on is the one that kept me using Firefox because it is very, very useful. I can have many "profiles" with which to log into the same websites using different accounts. It's super easy to use and works perfectly. The container settings menu (second screenshot) could take some polish, but overall it doesn't hinder the usability of the add-on.