Great addon! To the user who asked 12 days ago: you can delete a site from a container in the extension: press on extension, press on manage containers, choose one, press manage site list, delete the ones you don't want to open in a certain container:)

it was great!

Extremely powerful

There are no equivalents to this addon in other browsers, and no way for me to overstate just how important it is to have on the modern web. Developers can see how a site looks for five different users without needing five browsers open. For users with multiple accounts on the same service, you can do the same thing.

Multi-account Containers is an indispensable tool, and only on Firefox.

Plus besoin d'ouvrir un autre navigateur pour ce connecter avec 2 comptes en même temps (un adm un utilisateur) sur sur un site.
Il est dans mon top 5 des plugins à installer sur Firefox.

Easily one of Firefox's must-have features and an "I can't believe this doesn't ship with every browser" moment.

Good idea, flawed execution. Hard to configure. Breaks some login redirects. May lose database on crash - requiring complete reconfiguration.