Bug #1947501 “update-manager should not remove deb-packaged Firefox on flavors” https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1947501

Prevent Software Updater Installing Firefox Snap in Ubuntu MATE 21.10 - UbuntuHandbook https://ubuntuhandbook.org/index.php/2021/10/prevent-installing-firefox-snap-ubuntu-mate-21-10/

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