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

"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

The "Fast Video Download" extension has been reported to cause this issue.
*Fast Video Download: https://addons.mozilla.org/firefox/addon/fast-video-download-with-searc/

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Here is what I get when I try and load THIS PAGE in Firefox. I used Chrome to paste this.
Troubleshooting Information
This page contains technical information that might be useful when you're
trying to solve a problem. If you are looking for answers to common questions
about Firefox, check out our support web site.
Copy all to clipboard
Application Basics
Name
Firefox
Version
3.6.3
Profile Directory
Show in Finder
Installed Plugins
about:plugins
Build Configuration
about:buildconfig
Extensions
Name
Version
Enabled
ID
Modified Preferences
Name
Value
browser.history_expire_days.mirror 180
browser.places.smartBookmarksVersion 2
browser.startup.homepage_override.mstone rv:1.9.2.3
extensions.lastAppVersion 3.6.3
network.cookie.prefsMigrated true
privacy.sanitize.migrateFx3Prefs true

50.28.68.31:2087 uses an invalid security certificate. The certificate is not trusted because it is self-signed. The certificate is only valid for a id="cert_

50.28.68.31:2087 uses an invalid security certificate.
The certificate is not trusted because it is self-signed.
The certificate is only valid for <a id="cert_domain_link" title="new.thelifeincomegroup.com">new.thelifeincomegroup.com</a>
(Error code: sec_error_untrusted_issuer)

See https://support.mozilla.org/kb/Secure+Connection+Failed

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

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