>> Держать "ESR" Firefox большого смысла нет.
> Почему?  Или "уже"?

xap/mozilla-firefox-86.0.1-x86_64-1.txz:  Upgraded.       When we first moved Slackware to the Firefox ESR channel, the motivation                                        was to keep Firefox secure while delaying a requirement for Rust at build                                       time. Of course, eventually that ESR version reached EOL and we had to                                          introduce Rust into Slackware 14.2 in order to continue providing updates.                                      Eventually that also ran into roadblocks as Firefox required first newer                                        C/C++ compilers, and then finally a newer libstdc++. To continue, we'd                                          have had to bump GCC to a much newer version, making other maintenance                                          difficult or impossible. At this point, the latest Firefox has no additional                                    dependencies beyond those of the ESR version, and it's unlikely that it
  will be any more difficult to keep it maintained. I th
ink we all want the
  Slackware 15.0 release to be as good as possible, and
most users will be
  better served if we resume following the latest deskto
p releases.

Плюс, 91 тоже "ESR".