This is great productivity hack and helps so immensely.

EN:
Great extension, secure, from the developers themselves, open source, updated.

RU:
Отличное расширение, безопасное, от самих разработчиков, с открытым исходным кодом, обновляется.

Annoying prompts to ask for a review automatically gained it a 1-star review from me, stop wasting my time!

This extension is one of the most useful things in Firefox. Pair it with Sticky Window Containers and it's perfect.

This extension is great and works like a charm, allows you to use different social media apps in different containers making it a little bit more difficult for them to track you, plus, allows you to check different email or whatsapp account in the same browser.

Not only useful for keeping separate logins and separating work/private browsing, it also is a very helpful tool when developing and testing web sites

Older versions worked flawlessly. Now, any time I click on a link of a page already opened in a container...it opens outside of any container. When I right-click the link and ask to open in a specific container it opens the link outside of any container. That makes this addon useless.

Very practical! It's really easy to be able to separate various accounts and websites!

Great idea in principle. But it is extremely annoying that it deletes configured containers so often. Notably - it does this if you disable and re-enable the extension. With no warning! It's a cardinal rule not to delete user data without at least one layer of warning.

Needs work. 700 issues reported.
I just can't make it do what I want.