Why Firefox under FreeBSD is so limited in cyphers ?

Here is https://test.abinet.ru with 2 cyphers enabled (
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030)   ECDH secp384r1 (eq. 7680 bits RSA)   FS 256
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f)   ECDH secp384r1 (eq. 7680 bits RSA)   FS 128
Firefox under FreeBSD choose the second one, while the same Firefox under Linux or Windows picks up the first.

If I disable the latter, Firefox fails to connect at all, so looks like TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 is inavailable for it.
Is it the problem with my FreeBSD installation or you have the same picture? It is slightly suspicious that top cyphers are unavailable.
I don't see where FreeBSD plays in what you show but perhaps this has something to do with it.
Your link contains discussion about server side mostly, anyway, Firefox uses security/nss
For me (FreeBSD-10.3 stable) Firefox uses the first cypher for your site (256_SHA384).
I found this one https://bugzilla.mozilla.org/show_bug.cgi?id=923089 and it looks fresh. Do you have ESR version or 'common' one ?
However, firefox-esr under windows uses first cypher. This is very confusing.