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With Firefox, opening a new tab in a non default container has a terrible default shortcut, and you can’t remap it to anything sensible (like cmd + some letter).

Just out of curiosity, have you tried creating a shortcut based on the menu name in the macOS global settings? As a Linux user who sometimes works for companies that issue Macs, that functionality goes a long way to preserving my sanity, but sometimes apps just hard-code a shortcut instead of using the OS.

It's especially bad when they killed the ability remap keys with the extension update in 2016 and haven't replaced the functionality since.

(Extensions can do it, but they only take effect after the current tab is loaded.)

Firefox has a profile manager and can run separate profiles. It's just a bit awkward to set up.