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I keep getting the following message www.facebook.com uses an invalid security certificate. How do I correct this?

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  • Last reply by cor-el

sshamblin
sshamblin
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Until yesterday Firefox has been my go-to internet browser. Places I have gone to on a regular basis like Facebook, Yahoo mail, Verizon Mail, and my bank are no longer accessible through Firefox. Every time I try to access one of these websites, I get the following message: "www.website.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown." How do I correct this? I can access these websites using another browser without any difficulty. Nothing on my computer has been changed,

Until yesterday Firefox has been my go-to internet browser. Places I have gone to on a regular basis like Facebook, Yahoo mail, Verizon Mail, and my bank are no longer accessible through Firefox. Every time I try to access one of these websites, I get the following message: "www.website.com uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown." How do I correct this? I can access these websites using another browser without any difficulty. Nothing on my computer has been changed,

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cor-el
cor-el
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  • Top 10 Contributor
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You can check the date and time and time zone in the clock on your computer: (double) click the clock icon on the Windows Taskbar.

Did you recently reset/refresh Firefox and created a new profile?

Who is the issuer of the certificates?

You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.

  • Click the link at the bottom of the error page: "I Understand the Risks"
  • Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate"
  • Click the "View" button and inspect the certificate and check who is the issuer.

You can see more details like the intermediate certificates that are used in the Details tab.