Firefox on Debian stable is so old that websites yell at you to upgrade to a newer browser. And last time I tried installing Debian testing (or was it debian unstable?), the installer shat itself trying to make the bootloader. After I got it to boot, apt refused to work because of a missing symlink to busybox. Why on earth do they even need busybox if the base install already comes with full gnu coreutils? I remember Debian as the distro that Just Wroks(TM), when did it all go so wrong? Is anyone else here having similar issues, or am I doing something wrong?
I've been on Debian Testing for my own desktops for about 15 years now. Sometimes as a Frankendebian mixing in SID/unstable. Sometimes mainly unstable, but mostly just Testing.
It rarely breaks, but when it does, it's a learning opportunity. Stable for servers and other people's desktops. Maybe with backports. Flatpacks if this no other option.
You don't get 100% solid and 100% new. Ever. With anything.
A someone who worked in OS security, I beg you dont use flatpaks.
As someone who works, flatpak's solve a bunch of problems, freeing me up to continue working.
Security issues are just a class of issue; no more or less important than other issues