I discovered Ubuntu, 2024 edition (no I’m not switching).
Once installed, it comes with Firefox preinstalled, with the icon showing up in the GNOME dock.
There’s a ‘firefox’ .deb package installed, but hey ‘dpkg -L firefox’ shows that it’s almost empty, with little more than /usr/bin/firefox, and — surprise! — ~/.snap/firefox occupies quite a bit of space. Hmm! 🤔