This app fixes the problem of having two O-365 accounts and MS not being able to keep them separate. Also great for reducing the number of cross-site tracking and marketing. I don't get as many ads for things I've already purchased as I used to. The only issue I have with it is that you can't pin an entire subdomain to a container. If a site uses different hostnames for different functions, you have to specifically pin each one (AWS does this a lot). If you lock the container so other sites don't accidentally open in it, you also can't open a new hostname under a domain that's already part of that container.

Can't work without this. Should come standard as part of the browser.

Works wonderful for separating my work and private accounts.

with growing threat of online fraud, I feel this is one of the easiest steps to prevent fraud.
I use one container for banks, One container for shopping sites and one for regular use.

Thanks Firefox for supporting in difficult times.

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Fantasticounzi!!! Funziona benissimo. Tanti browser in 1. top!

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.

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