How to sandbox Chromium that's installed via SNAP?
Solution 1:
According to Firejail's man page which you can access by the command man firejail, they do not support snap packages.
Alternative sandbox technologies like snap (https://snapcraft.io/) and flatpak (https://flatpak.org/) are not supported. Snap and flatpak packages have their own native management tools and will not work when sandboxed with Firejail