What use to be the PPA that allowed Ubuntu users to use native .deb packages for Firefox has recently changed to the same meta package that forces installation of Snap and the Firefox snap package.
I am having to remove the meta package, then re-uninstall the snap firefox, then re-uninstall Snap, then install pin the latest build I could get (firefox_116.0.3+build2-0ubuntu0.22.04.1~mt1_arm64.deb) to keep the native firefox build.
I’m so done with Ubuntu.
Known-good meaning a tested and working configuration approved by the developers/maintainers.
Flatpak is just another model of distribution. There isn’t really anything that needs to change here. The fixes are fixed upstream and they get pushed via the method of distribution, which is Flathub in this case.
The security team in a given distribution is charged with getting upstream fixes backported and shipped. There’s no need for this, because they’re just shipped directly.
The developers are usually the ones doing the fixes in the first place.
Well, fixes don’t normally need to be backported because flatpaks are usually fresh. They’re just built normally in most cases.
For notifications, you’d have to follow the relevant projects directly.