It looks like the certificate for <https://www.seamonkey-project.org/>
has expired:
Technical Details
www.seamonkey-project.org uses an invalid security certificate.
The certificate expired on 12/09/19 13:00. The current time is 12/09/19 19:21.
Error code: <a id="errorCode"
title="SEC_ERROR_EXPIRED_CERTIFICATE">SEC_ERROR_EXPIRED_CERTIFICATE</a>
Looks like someone else has already reported this on Bugzilla 1580858:
<https://bugzilla.mozilla.org/show_bug.cgi?id=1580858>
And SeaMonkey doesn't allow an exception to load the page anyway, since
the site uses HSTS.
--
Mark.
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