Having separate cookies for each container is an absolute godsend!
The thing I really miss is, that you aren't able to set containers in bookmarks, that's why I deducted a star.

On YouTube, I have a container for each of my channels, so I don't have to switch accounts constantly, and each container is saved as a separate bookmark, so I can access that channel easily.

For the time being I installed a separate extension to solve this, but imho, this should definitely be solved in this extension, since this is a very basic/common request I would imagine.
https://addons.mozilla.org/en-US/firefox/addon/container_bookmarks/

This is very useful. Thanks for building it.

Cool app. The only problem I have is duplication of containers on firefox updates. Not every update though.

It will open links to other websites into the same container if clicked on. It would be nice to have an option to disable this

Работает прекрасно!

sangat bermanfaat untuk buka banyak akun.

Love it use it all the time.

This add-on is the main reason why I stick to Firefox. It is an absolute game changer when I need to use multiple accounts on the same website at the same time (e.g. have Gmail and YouTube in different accounts on different tabs).

Thank you.

El color del contenedor debería estar en toda la pestaña más visible como tiene chrome solo una línea es casi imperceptible en Pc que está má alejado.

Great add-on, love it. Although it is missing a crucial feature, the ability to add wildcard domains.