Generic Answer #1:
Bypassing the warning
You should only bypass the warning if you're confident in both the identity of the website and the integrity of your connection - even if you trust the site, someone could be tampering with your connection. Legitimate public sites will not ask you to add connection rule exceptions - an invalid certificate can be an indication of a web page that will defraud you or steal your identity.
1. On the warning page, click I Understand the Risks.
2. Click Add Exception.... The Add Security Exception dialog will appear.
3. Read the text describing the problems with this site.
4. Click Confirm Security Exception if you want to trust the site.
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Unfortunately, I'm not sure how to be rid of it entirely. My dad has it on all of his browsers and it's so frickin annoying that now I only use my computer. I am guessing it's something to do with a security setting perhaps in his AV or firewall since all of his browser settings appear okay.