I just started using it and I find it very useful. I don't have to keep separating pages using the private window.
The colors and the ability to sort by container make it easy to navigate through the tabs.

I am so glad this exist. I can finally thwart cross-tracking. I'm specifically a fan of the possibility of assigning domains / sites to specific containers. And it's so easy to use.

Does what it says on the tin, great for administering multi tenant 365 customers.

An absolut must to enhance your privacy and minimize cross-website tracking.

My personal Firefox killer feature. Love it.

Essential for many of my workflows. Works very well.

This is an amazing extension for me since I need to log into my Google corporate account and my personal Google account, and I can have both of them open in the same browser in work and personal containers. Also, having different containers helps me manage web logins and autofills much more easily.

Очень удобно! Все сайты теперь по категориям!

An absolute must if you login to various sites with different profiles.

[2021-Aug] A great and useful extension to have, but it's missing the ability to disassociate a website from *any* (or all) containers. A website's association can be moved from container to container, but cannot be reset back to no container -- something that would be needed in the case of SSOs: to log into the same website with different accounts (under different containers).

It's wonderful!

The add-on is great! I can imagine that it's a bit difficult to understand if you are not that much into computers though. The only thing that I can not find is a way to manage which tabs belong to which containers. You can assign them, but you cannot manage them.

If that "feature" is added, or some one of Mozilla can explain to me how I can manage it, I'll update this review to a 5-star.

EDIT: I've found it, but why is it so hidden?
It is hidden 6 clicks deep within the extension's toolbar button. Why not put that also in the settings of Firefox add-ons menu?