access to low 40-bit ciphers no longer works with Firefox 19.0

Since updating to 19.0 I have a problem accessing https servers with old, less-secure ciphers:

Cannot communicate securely with peer: no common encryption algorithm(s). (Error code: ssl_error_no_cypher_overlap)

I have used about:config to set security.ssl3.rsa_rc4_40_md5;true, which is how I got this to work for older versions of Firefox. It is still set to true after update to 19.0, but access no longer works.

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