Why there is not "security.enable_md5_signatures" option in some instllations of Firefox 28?

In some instllations of Firefox 28 there is not "security.enable_md5_signatures" option.
Where it is present, making it "true" not allow to be used md5 certificates like versions before 28.

Thank you very much for useful explanation.
Finally, from removing of "security.enable_md5_signatures" option, we must understand that MD5 certificates will not be supported from Firefox 28 and future versions, even option is set "true" in user set after updating the browser?
We are familiar that from Firefox 16 there is no longer supporting MD5 as a hash algorithm in digital signatures, but if "security.enable_md5_signatures" option is set "true", browser works with them. May be this was changed [https://bugzilla.mozilla.org/show_bug.cgi?id=795398 here] and MD5 support is stopped?

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