? Unstable has 107:

https://packages.debian.org/sid/firefox

Not everyone needs bleeding edge.

Sooo... Debian is good if you don't want up to date browsers.

Debian stable users who did want latest Firefox could download the binaries from Mozilla. Just unpack and run from e.g. home directory or perhaps copy to /opt/

https://www.mozilla.org/en-GB/firefox/all/#product-desktop-r...

Just install Firefox via Nix or Guix or Flatpak. Not all ancillary package managers are as terrible as Snap.

Or just get the .deb binaries from Firefox, and install them with apt/dpkg.

There is no real need for "ancillary package managers", and all they do is complicate system maintenance.

Running an out-of-date browser is a security concern, is it not? Does Debian have a policy where they'll just backport the latest non-ESR from Unstable whenever a new 0-day is discovered? If they do and they're quick about it, I guess it's more a matter of personal preference.

Anyway, using Guix, Nix, or Flatpak is definitely a better idea than installing standalone debs for a different version of Debian than you're running, where it may be built against libraries that aren't part of your distro.

If you want to use the Debian package from Sid on Testing, better to rebuild it from source. openSUSE's public instance of the Open Build Service is a convenient way to manage keeping a repo for that up to date. But that definitely complicates system maintenance, too!

> Running an out-of-date browser is a security concern, is it not?

Only if you assume new bugs are better than old.

Which they are. Running software with bugs nobody knows about yet is safer than running software with bugs everyone has known about for a while.