Thanks for that. The error I get when attempting to go to the original URL ( https://www.samba.org/samba/news/releases/4.0.0.html ) is

    Cannot communicate securely with peer: no common encryption algorithm(s).

    (Error code: ssl_error_no_cypher_overlap)

I went to about:config and turned on all the default-disabled ssl ciphers (per https://support.mozilla.org/es/questions/818578 ) but it didn't resolve the trouble.

UPDATE: I tried restarting my browser, and then it worked BUT after trying to do a binary search on which cipher setting was the "fix", I got to where everything was back to default, and the site still works. Probably there was a site problem that was fixed in the interim.