Firefox puts the score in /tmp if you say you want to open the file in MuseScore immediately. This is a serious usability issue. If we decided that the snap was so good (with automatic silent background updates and proper updates thanks to bundled dependencies) that we made it even less confusing for users to install by removing the Deb from the repositories (or at least hiding it from Ubuntu Software) and then having upstream recommend only the snap (or Flatpak, or AppImage) for Ubuntu users, those users will be completely confused when opening a score from Firefox and expecting identical functionality to the Deb - because opening the score won’t work. Is there nothing we can do (other than changing to classic confinement which should be avoided if possible because of manual reviews and because it would be nice to keep this sort of thing working on a theoretical all-snap Ubuntu) to keep this functionality?