> Can I safely uninstall the extension and keep my existing containers, names, colors, icons, cookies, and active sessions?

Great question.

As a very satisfied, long time user of 2 extensions in combination, Temporary Containers and Firefox Multi-Account Containers, I wonder the same thing.

I found out the hard way some time back that simply disabling (not even removing it) and re-enabling the Firefox Multi-Account Containers extension would cause all the painstakingly set up containers and their saved credentials/data to get "lost".

If there were to be a way to "export" and "import" sets of named containers with their settings and data, that would be great for not losing which-site-maps-to-which-container-and-is-already-signed-in (whether natively or within an extension).