deskthority

Same for the Wiki. Chances are that it's a Daylight Saving Time problem. Chrome just blocks the website. Firefox allows you to continue after showing the error.

FWIW, I'm in Arizona, USA and we don't do DST.

My browser shows the certificate was just renewed as I typed this, so it looks like they fixed it.

Old Firefox version didn't allowed the connection at all:

This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate.

But now it works indeed.

Seems to be, work in progress: currently it was blocked again...

According to posts in the chat, there are some technical issues related to the transition to the new owner.

Different CA will be used, perhaps?