I have installed the .deb version of Mozilla Firefox on Ubuntu. It was recently replaced by unattended-upgrades with the snap version. I get the impressions that is due to the fact that unattended-upgrades does not consider https://packages.mozilla.org/apt/dists/mozilla/Release as a source when running. It seems that it would be possible to configure unattended-upgrades to include https://packages.mozilla.org/apt/dists/mozilla/Release. The current value for "Origin" in https://packages.mozilla.org/apt/dists/mozilla/Release is "namespaces/moz-fx-productdelivery-pr-38b5/repositories/mozilla" (''to me pr-number looks like a pull request''). I would like to confirm whether or not this is a stable value for Origin, and if not - can a stable value be allocated?