Firefox remove McAffee annoyance

Current somehow has McAffee built in. I ceased tolerating security exceptions preventing access to a couple of sites, videlicet, my DSL modem 192.168.0.1 self-signed certificate, and looking for a magnifier in Settings|New Desktop Effects. I added the exceptions for local addresses and https://autoconfig.kde.org, but when I tried to get more effects to browse through, nothing happened. I entered the address into firefox https://autoconfig.kde.org/ocs/providers.xml, and McAffee intervened forbidding access. Reflex from previous nonsense downloaded firefox 129.0.1 from mozilla.com, deleted /usr/lib64/firefox replacing it with the firefox folder from the new tarball, and dratted McAffee stymies me nevermore. The question presents itself: How did McAffee end up in current firefox 128.0.1esr? Did Mozilla include it? Of course such software is vital for Microsoft virus magnets, but what is it doing on a kernel.org box? It is one thing to prevent naive webbage surfers from getting into mischief, but link-local networks and kde.org, I mean, what?
[I posted the solution herein because duckduckgo's hits on a search for adding security exceptions are a decade old and no longer relevant.]