Bypassing unsafe SSL encryption with DHE, which is blocked by the new version of Firefox 39+
Firefox display the following error: An error occurred during a connection to xxx.xxx.net SSL received a weak ephemeral Diffie-Hellman key in Server Key Exchange handshake message. (Error code: ssl_error_weak_server_ephemeral_dh_key)
The work-around for Firefox is to allow SSLv3 with DHE using the following steps:
1) In FireFox, enter "about:config" in the URL field and press enter.
2) Accept the "This might void your warranty!" warning :)
3) In the search field at the top, enter "security.ssl3.dhe_rsa_aes"
4) Double click each result (128 and 256) to toggle the Value to "false"
Now retry your site - it should work now. Remember to change these settings back when you're done.