Why is firefox using the (presumably broken) RC4 128bit SSL encryption as highest priority default encryption?

128 bit encryption is no longer a real security deal. There are known attacks on RC4 and there is a warning from NIST to do not longer use it in a new product.
Firefox uses an internal list on prefered cipher suites. Why does firefox do not request for 256 bit encryption as default (AES and Camellia) and in a second step, if negotiation with an outdated server fails, fall back to 128 bit encryption? I know the user can block 128bit from about:config, but why is such an insecure and outdated SSL encryption option the default behaviour?

You can disable the 128 bit RC4 ciphers by setting the related security.ssl3.* prefs to false.<br />
If you need to visit a server that only works with an 128 cipher suite then you can enable one or two 128 SSL ciphers.<br />
Note that some servers host CSS files on such servers with older server software.
*security.ssl3.rsa_rc4_128_md5
*security.ssl3.rsa_rc4_128_sha
*http://kb.mozillazine.org/about:config

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.Jake. wrote:
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Why is firefox using the (presumably broken) RC4 128bit SSL encryption as highest priority default encryption?

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