I had no problem with your link. What's your computer system and Firefox version? 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 http://kb.mozillazine.org/Error_loading_websites

What do you mean by "time related"? If your system clock differs from reality in either '''date, time, or time zone''', Firefox may not be able to validate certificates, so that is definitely something to check -- click the clock at the lower right of the Task bar, then click "Change date and time settings" to access the settings dialog.