An absolute must have.
It allows in the same time to reduce our privacy exposure and ease the use of multiple accounts on the same domain.

An exemple of usage I love is connect to gmail with an account and to youtube musique with another account because it have subscription to it.

PS FOR THE DEVELOPPERS: The only missing feature for this extension is the ability to isolate plugins too.

It is very useful addon! I really love it!

This should be rolled out as a general feature. Some services or segments are just part of our lives, but are too intensive and invasive. Firefox containers is the best solution/workaround to these 'necessary evils'.

De oplossing om aan te melden bij verschillende e-mailboxen van dezelfde provider. Bespaart een hoop ergernis en maakt het super simpel zonder iedere keer af te melden bij schakelen naar een ander e-mail account.

Precisava acessar usando diferentes perfis, para isso ou tinha que criar personas ou iniciar o navegador com diferentes pastas de usuários para ter configurações distintas.

O Multi-Account-Containers permite eu manter tudo em uma só instância do Firefox, o que me salva muito processamento e memória, podendo abrir vários perfis da mesma rede social ou do mesmo serviço de email agilizando muito o trabalho.

Fui além, e descobri a possibilidade de melhorar a privacidade abrindo sites "pais" de muitos rastreadores apenas em um contêiner específico e deixando literalmente as bestas presas em suas gaiolas.

Firefox inovou muito com esse recurso, sem dúvida deveria se tornar padrão (inclusive mobile).

I use Google for work and home, and Containers is the only way I can avoid repeated login prompts and Google services that insist on using the wrong credentials. It's a unique feature that keeps me coming back to Firefox!

Multi-Account Containers makes my life with multiple clients and many identities much easier. Great add-on if you have more "contexts" in your online life and you want to keep them separated.

I have multiple clients for my business with many overlapping web services which I need to log into with multiple accounts simultaneously. This add-on is perfect for my needs and solves a real problem for me.

perfect

Very good. The only one more feature I need is ability to set home page for container. I use some containers only for e-mail accounts or other one specific site and I'd like to have open this site automatically when I open container.

Really good. Really help me to check my accounts as if I wasn't logged in. Also it can help me to separate work and daily life browsing.

Great add-on, I use it for personal/work separation, banking, shopping vs. social media separation.
Works great, allow sync between devices, remember site>tab assignment

For IT - great when working with multiple identities in same services like o365

It would be ideal to be able to clean private data from containers. I love the option to clear browser data when closing it, but it would be very useful to be able to clean the containers in a particular way (or if there was one that was automatically cleaned when closing Firefox).