Firefox is throwing up a security warning on that site:
Warning: Potential Security Risk Ahead
Firefox detected an issue and did not continue to www.history.navy.mil. The website is either misconfigured or your computer clock is set to the wrong time.
It’s likely the website’s certificate is expired, which prevents Firefox from connecting securely. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details.
Firefox is throwing up a security warning on that site:
Uhoh.