Apparently something has changed here, because as of today I can't connect with Firefox. I get a message:
Your connection is not secure
The owner of forum.largeformatphotography.com.au has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.
This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate.
My solution is to use my other browser, Chrome, which still connects OK. Is anyone else experiencing this?