Makes me wonder about "Container Tabs" [0]

I saw this feature and never gave it much thought, but this post has me looking seriously at it.

Firefox containers let you separate your browsing activities into color-coded tabs for banking, work and personal browsing. This allows you to always open new tabs in containers of your choosing for a more private browsing experience. Each container is isolated from the others, so you can access sites logged into different accounts. This article explains how to enable and use the Firefox containers manager to open containers from the main browser interface quickly.

[0] https://support.mozilla.org/en-US/kb/how-use-firefox-contain...