Containers are more convenient than having multiple profiles in different windows. Must have for testing when you need multiple sessions to test web software. It is easy to open the same site in different container right from tab. Also there is useful feature to configure some sites to be always opened in specific container by default. This way i separate personal sites and sites for work.

I really like the extension. It would be very helpful if one could synchronize the containers via "firefox sync".

Edit:

I have managed to "sync" the container settings manuel. I installed Linux and wanted to use the same containers as before with Microsoft. For this you only have to copy two files:

1. "containers.json" (Microsoft: user - AppData - Roaming - Mozilla - Firefox - Profiles - xxxxxxxx.default)
2. The "storage.js" File from @testpilot-containers (Microsoft: user - AppData - Roaming - Mozilla - Firefox - Profiles - xxxxxxxx.default - browser-extension-data)

Close Firefox, copy and replace both files and restart Firefox. This worked for me.

I find this extension extremely useful for managing different user profiles (personal and work related) in the same browser!
Previously I had to use two different browser to keep the logins separated yet accessible. Now I can manage everything within Firefox!

Very good add-on for privacy conscious people. It's fantastic I can separate work from private things this way. Signing it to the two different accounts in the same time is also great by the way. I've got no problems with this add-on so far.

Very useful. I use it to keep my work and personal profiles separated

Perfect! No need to open different browsers to keep things separated anymore!

Goodapp

I enjoyed being able to easily separate my work tabs from the tabs I have open during break. Being able to show/hide all tabs in a container is an awesome feature too. Just wish it was easier to access.

Great extension! Killer feature indeed.
What is to be implemented at first; add containers to bookmarks. Then we could start any web service under desired account, and don't forget, which container(s) we usually prefer for this service.

It's very useful to be able to keep my accounts separate, both from a business perspective (multiple google/microsoft accounts), as from a privacy perspective (all google or facebook tabs in their own containers). It may be a bit of a hassle to set up, especially since you have to set it up separately on each device. Once it's set up, it works really well, always opening websites in their assigned containers. I would like to see a sync feature, and the ability to reload the current tab in a different container.

Compartmentalization. Good Stuff

Allows me to separate work accounts from personal accounts or primary account from test account even on websited that do not support this natively. Super useful and works without issues for me.

Super extension, permet d'ouvrir plusieurs comptes différents dans différents onglets. Ca serait bien de pouvoir définir une URL à ouvrir automatiquement quand on ouvre un container

One Word - GREAT

It's great because it helps you know what tabs are you opening and don't forgot your self spending a lot of time on something useless

E

This is a must have extension for anyone who juggles both work and personal on a single computer. I install this extension first whenever I have a new install of Firefox

Great, only separate bookmark handling is missing ;)