This has great potential! Sadly it outright refuses to work in private browsing mode. I wish it also had a few more customization options too. Works perfectly on normal windows!

Great extension, the ability to open a site in its own container makes it almost perfect. One thing that still lacks is the ability to sync settings between firefoxes installed with same account.

This addon is really useful. It helped me manage my personal, college and work accounts without constantly signing out of one and signing in to another. If you have more than one account for the same thing I recommend this add-on.

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.