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by SAI_Peregrinus 1974 days ago
The Temporary Containers addon[1] does this. Combined with the usual Multi-Account Containers "always open this site in..." mechanism you can have some sites always open in a single container, but all other sites open in temporary containers that get deleted shortly after you close their tab.

[1] https://addons.mozilla.org/en-US/firefox/addon/temporary-con...

2 comments

For clarity - the workflow is basically that all sites would be temporary containers, except sites you explicitly set to be managed by Multi-Account Containers?

edit: I'm trying this out, seems to work nicely - but assigning all the sites that i want permanent state on to different account containers is a bit of a chore. Feel like i'm doing something wrong there.

But the temporary containers are working great

I don't want the containers to be transient. I want to be able to persist session cookies and local settings.
I commented on the main post, but First Party Isolation is exactly what you want, and breaks relatively few websites (and there's an extension to turn it on/off if you do use a website it breaks).