Why does firefox say certain websites like the website for mozilla support is not a secure website?

The websites to where I can check my status at the new school I am getting ready to start, my bank's website, facebook, and the website for the mozilla support are telling me when I go there that these sites are unsecure and the firefox will not let me access these websites.

Can you attach a screenshot?
*http://en.wikipedia.org/wiki/Screenshot
*https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem
Use a compressed image type like PNG or JPG to save the screenshot.
Do you mean that you get the page that says that a secure connection failed?
Check out why the site is untrusted (click "Technical Details to expand that section) and if this is caused by a missing intermediate certificate then see if you can install this intermediate certificate from another source.
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 of the certificate.
You can see more Details like intermediate certificates that are used in the Details pane.
If "I Understand the Risks" is missing then this page may be opened in an (i)frame and in that case try the right-click context menu and use "This Frame: Open Frame in New Tab".
Note that some firewalls monitor secure (https) connections and send their own certificate instead of the website's certificate.
*ESET setup -> advanced setup -> extend web and email tree -> SSL
*SSL protocol: Do not scan SSL protocol

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Why does firefox say certain websites like the website for mozilla support is not a secure website?

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