https://addons.mozilla.org/en-GB/firefox/addon/auto-containe...
https://github.com/stoically/temporary-containers/issues/347
Edit: Seems to break ad blocking and there's some issues with login. Such as adding a container for YouTube requires also doing *.google.com since that's how the login is handled. Interesting and I'll keep playing around with it
Regarding login, it's a struggle with any container addon. But I like how this one makes it easier. It streamlines it a bit because you can right click the page and go to Auto Containers -> Exclude tab from domain exclusions, then login as normal and add each intermediate domain to the container's URL patterns. It would be nice if the dev could add a way to record all intermediate domains and add them at the end; sometimes I miss one or two due to an auto-redirect.