Ubuntu uses Snap as first-class method to install software. So if a piece of software is available as DEB or Snap, Ubuntu will always use Snap.
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I’m aware that when the user runs(without adding Mozilla’s apt repository),
sudo apt install firefox
the snap version of Firefox is installed. But I never heard that, though APT is configured to install Firefox from Mozilla’s repository, the DEB version will be uninstalled and the Snap version will be installed.
The whole apt ecosystem is kind of a mess, if you ask me. Debian stable updates on archeological timescales, Debian testing just isn't a very good rolling release disto, you're better off with Arch or OpenSuse Tumbleweed if you want to actually use a rolling release as a daily driver, Ubuntu is a mess of annoying corporate decisions I hate from Canonical, and all the others are all just kind of disjointed in how they try to fix those issues.
My personal favorite is Mint. They just try to make Ubuntu with some classic, boring desktop design and minus the more controversial Canonical decisions, but obviously that's not everyone's cup of tea. I dunno, there is no perfect distro, you just have to find the one that for you it takes the least amount of effort to fix. Ubuntu really just kind of makes it a pain in the butt to fix all their weirdness though.
Debian testing just isn’t a very good rolling release disto
What makes you say that?
One of the reason I moved to MX Linux, it is Debian based, always latest everything, like 6.12.11 kernel, my FF just got updated to 135.0, and it is no systemd, no flatpak, no snap, everything is DEB, and stable.
You could compile it from source yourself, and you won't even have to worry about packaging and package managers.