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Re:Firefox 81.0 by npteljes on Tuesday September 22, 2020 @11:46AM (#24555893)
There's an addon called Containerise that seems to do what you describe. The basic usage in the description could be easily used to isolate the bandcamp sites.

https://addons.mozilla.org/en-US/firefox/addon/containerise/

Re:Firefox 81.0 by waz0wski on Tuesday September 22, 2020 @12:25PM (#24556464)
Works great in combination with multi-account + temporary containers extensions.

Grants the ability to regex match on domains & url paths for sites that do auth redirects or to isolate corporate & personal accounts on the same domain (github, google etc) - MAC should have this functionality built in, and there are several open issues requesting it.

Containerise does have builtin limited temporary container functionality, but I found the separate extension to have more useful configuration options for how temp containers are handled