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by kaba0 1033 days ago
Nix, NixOS. It has firefox LTS and nightly, and the other two packaged as well. You can in fact freely go back and install any combination of versions/configurations for each of these, even multiple times.

Flatpak mixes up packaging and sandboxing, these two imo should not be that close coupled. Especially that it doesn’t even solve the former properly (not sure about the latter).