https://forum.eset.com/topic/5348-since-firefox-39-ssl-received-a-weak-ephemeral-diffie-hellman-key-error-code-ssl-error-weak-server-ephemeral-dh-key/
 users 'Phydeauxdawg' and 'CCSE' helpfully list a work-around:
--8<--
Go to about:config

search for security.ssl3.dhe_rsa_aes_128_sha and 
security.ssl3.dhe_rsa_aes_256_sha

Set them both to false.
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and 

-->8--
security.ssl3.dhe_rsa_des_ede3_sha, must be false too.
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hth
~ Guenther

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