Firefox - Secure connection failed

If you see the error below for some webpages in firefox you can try to disable old ciphers to resolve it.

Go to "about:config" in firefox
Search for "dhe"
Switch ciphers to "false" with a double-click:
  • security.ssl3.dhe_rsa_aes_128_sha
  • security.ssl3.dhe_rsa_aes_256_sha