When it comes to the state of packaged web browsers for Debian GNU/Linux, unfortunately it leaves a lot to be desired at the moment and for those wanting to be secure and up-to-date it can mean resorting to proprietary or un-packaged browser builds.
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
The post is funny because nearly 2 months ago Firefox ESR had 2 versions as maintained (and you could choose which one you download from an advanced form) and a month ago, with the release of Firefox ESR 91.3.0, the branch for 78 was deprecated.
In the Debian tracker, the Firefox ESR package upgrade seems stuck by a different reason that the one listed there, it is waiting for tests (not mentioned) to be passed in order to migrate to the last ESR.