Error code: SEC_ERROR_REVOKED_CERTIFICATE
Some websites not supports for your browser (Error code: SEC_ERROR_REVOKED_CERTIFICATE) all browsers are supports like as Google Crome, Edge, Opera, UC Browsers, Safari etc,. But Firefox Desktop version not supporting and mobile firefox is supporting. what is problem for your side, please resolve or else update your browser.
Wot freetimelearn
Wšě wotmołwy (2)
https://www.bing.com/search?q=SEC_ERROR_REVOKED_CERTIFICATE
There is security software like Avast, Kaspersky,
BitDefender and ESET that intercept secure
connection certificates and send their own.
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
Websites don't load - troubleshoot and fix error messages
http://kb.mozillazine.org/Error_loading_websites
There is a problem with the certificate chain used by his website and this needs to be fixed on their side, so you will have to wait until this is fixed.