1
Bugzilla.mozilla.org dev's suggest this was added a couple of years ago (references below) however I see no information anywhere or any options under about:config
to accomplish this... I only see options for enabling/disabling ciphers, and nothing for curves.
Reference 1: https://bugzilla.mozilla.org/show_bug.cgi?id=319327#c10
Reference 2: https://bugzilla.mozilla.org/show_bug.cgi?id=1296239