Websites will not open - error code SEC_ERROR_BAD_SIGNATURE - Google opens them without a problem
google.com opens without a problem, but nothing else seems to work. Am also having a problem with Thunderbird - will not download or send messages. I have to use webmail from my ISP provider for mail.
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As to Thunderbird, post your question here; https://support.mozilla.org/en-US/products/thunderbird
There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connections and send their own certificate.
https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can
https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites
https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message
https://support.mozilla.org/en-US/kb/connection-untrusted-error-message