Disappointing! Does NOT create containers! This ONLY allows you to manually open new tabs and duplicate existing tabs with a color code. Either way this requires extra steps, time, and thinking. Containers are a great concept along with color coded windows and related tab groupings, but none of this is offered.

This is by far the best solution for anyone who wants to have separate spaces in browser storage for each part of their online lives. Now I can finally open multiple sessions to the same site and expect links to open in other sites with the corresponding online presence.
This beats the multiple browser profiles approach natively available in Chromium based browsers, because links from externals applications might not open in the correct profile. The same quirks apply to multiple Firefox profiles too. Being able to select which container certain links should always go to has solved at least 90% of my frustrations!

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!