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message for an invalid security certificate keeps popping up when I open firefox

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"fvd.kallout.com: 443 uses an invalid security certificate the certificate expired on 5/31/11

this could be a problem with the servers configuration or it could be someone trying to impersonate the server if you have connected to the server successfully in the past the error may be temporary and you can try again later"

This is what opens on my screen every time I have opened Firefox today. If I hit "cancel" the window closes, but I do not know what it means or how to permanently clear it, or if someone is trying to use my system illegally.

Can you please tell me what my best next course of action is?

Thank you,

cemerrick

"fvd.kallout.com: 443 uses an invalid security certificate the certificate expired on 5/31/11 this could be a problem with the servers configuration or it could be someone trying to impersonate the server if you have connected to the server successfully in the past the error may be temporary and you can try again later" This is what opens on my screen every time I have opened Firefox today. If I hit "cancel" the window closes, but I do not know what it means or how to permanently clear it, or if someone is trying to use my system illegally. Can you please tell me what my best next course of action is? Thank you, cemerrick

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The "Fast Video Download" extension has been reported to cause this issue.