Not really. After working with CentOS (RIP) for a half decade, that Firefox version was so out of date I was practically in diapers when it came out. Getting the latest version of Firefox was such a pain that my org didn’t bother even if it would have given us some niceties.
LTS and other “enterprise” distros don’t push the latest version precisely because of dependencies.
I expect they had some or mostly legitimate clients. Really hard to hide a drug distribution network in the open without legitimate traffic to hide in.