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0e1f616
(Get the code!)
As previously said, this is a security feature. If the current date on your computer is set to September 2, 2004 or before, a man-in-the-middle attacker who can control your network connection would be able to spoof any SSL site on the Internet using the MD5 Collisions Inc. certificate. This feature ensures Firefox never trusts the rogue certificate, even if the computer's clock is wrong.