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This looks excellent. I've wanted something like this before but wasn't aware of this extension. Thanks for sharing :)

Cookie auto delete is fairly useless. It can’t delete supercookies. Whereas temporary containers takes care of everything.

temporary containers is really nice. but how can you replace MAC with it? I tried before couldn't assign some domains to "permanent" containers.

eg. I'd like use temp containers all the time, except for some sites like YouTube where I'd like it to always open in a YouTube container

I've combined it with Firefox's Multi-Account Containers. It works exactly as you've described, when used in tandem with temporary containers.

Oh nice! I've been wanting a container extension that just works on every site by default.