Works!

Does what it says and I LOVE it, I have multiple accounts to manage and with this addon I can keep everything organized and don't have to stress with multiple browsers

Very limited. Very easy to use different container by mistake. CTRL-click inside one container opens tab in different one. New tab (Firefox "empty" page) is unaffected by container - shows pages opened in all containers.

Very useful tool to use multiple accounts in one service.
Better than private tabs for using services and prevent cookies tracking.

This add-on stops my Facebook and Google account from showing everywhere outside.
It would be helpful to remind users that it does not work when Private Browsing is enabled, since there are some people who enable Private Browsing all the time.

Very useful for privacy and security

I am a software architect, and quite often need to login to multiple sites with different logins, including Google to segregate between work and personal accounts. I'm in love with this add-on (have been using since its test pilot days). Very helpful!

Fantastic app that lets me open up work based tabs without interfering with personal tabs. Two Office 365 accounts? No problem! One container for each and away you go.

Saves opening different browsers just for a different account on the same website, especially the pervasive Office 365, which seems to be a right pain if you use two accounts with two organisations.

It's great extension!

Best Firefox's addon in my opinion. It's very useful.

Love it

I would love to have a shortcut eg. Ctrl+G to open a menu that lets me select the group for the new tab.

I use it to log in two or more Google accounts in different containers while still being able to search anonymously in a default tab when needed. This is really great !

It would be even better if the menu allowed to open a standard default tab in addition to container tabs, though it is still possible by pressing Ctrl+T.

There is countless great things you can do with Multi-Account Containers to control your privacy and use multiple identities in the same time. It even helps you to keep your tabs organized.

I highly recommend it if you like to keep many tabs open.

Containers is very useful, but I think there are two point inconveniet:

1. "Sites assigned to a Container" does not support match patterns (*), so you can't add *.example.com and you have to add subdomains one by one : (
2. The page "about:preferences#containers" is useless……