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How to block the site using untrusted certificate.

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When I am doing work in another sites an popup window is being displayed regarding another website (www.openbux.com) having untrusted certificate. I would like to block this site. How to block this site to prevent popup window and to do my work securely without getting hawked. The site is www.openbux.com.

When I am doing work in another sites an popup window is being displayed regarding another website (www.openbux.com) having untrusted certificate. I would like to block this site. How to block this site to prevent popup window and to do my work securely without getting hawked. The site is www.openbux.com.

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The www.openbux.com server doesn't send a required intermediate certificate.

COMODO High-Assurance Secure Server CA

You can inspect the certificate chain via a site like this: