Try creating a new Firefox profile and trying again. If it works, you'll have to find the configuration change or extension causing it in the original profile. The latest Firefox in the ports tree should be able to reach the forums without any modification at all.
I'm running the latest FF (39.0). Based on that link, they're saying my system isn't running the latest cryptography protocol. I can access it just fine using Chrome on the same system.
I had a similar issue in Opera Classic. Turned out that TLS 1.1 and 1.2 were not enabled - the FreeBSD forums apparently don't accept SSL or TLS 1.0 any more (good). So check you Firefox config, maybe it is the same problem.
I just ran into this on one of my boxes I haven't updated for a while the other day. I deleted all browser cookies after updating Firefox, and could connect to the FreeBSD Forums fine afterward. I don't know if this will work for everyone/anyone else with this particular problem but thought I would share what worked for me.
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