I really like the concept and the smooth implementation into the Firefox browsing experience.

Läuft soweit ich das beurteilen kann gut.

Works great! Makes it super simple to separate websites into isolated groups.

Edit: I agree with Dan; would be happy to see containers integrated with Firefox by default.

This is a killer feature that I would love to see incorporated into Firefox proper. I started using it fairly early on after its release, and containers quickly became integral to how I browse. If you want to be simultaneously logged into multiple accounts for the same website easily (and even restrict how such a site can relate your activity across those accounts), this is the extension for you.

好啊

Very useful if you have multiple accounts for different sites. I use it all the time!