It works great, except for the part where it can potentially cause data loss (switching a tab to or from the Facebook Container, e.g. by visiting Facebook.com from a Google.com search, causes the tab's navigation history to be discarded)
Note: it doesn't break your history menu or anything; as long as you don't clear your history, you should be able to get back to where you were by digging through that. However, it's quite tedious and for some people, Multi-Account Containers might be a better choice.

I had a big problem with some websites not working properly. Cookies could not be saved, cookie pop-ups would keep reappearing, and I couldn't login. Turns out it was this add-on!

I love this extension, EXCEPT...
It has a mandatory button on the address bar taking up precious url space and I already have other addons doing that, and so I encourage the developer to add an option to remove this button and be able to depend solely on the pinnable button to indicate the active container as I prefer (by way of switchable icons).. Thank you for your consideration...

Все хорошо

Nice concept, but i`m missing "exclude containers from sync" based on wildcard or prefix.