Bug#792475: iceweasel: Error code: ssl_error_weak_server_ephemeral_dh_key

[Guenther Thomsen]

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:
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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 

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