[GTALUG] 'Unable to connect' to https://www.mixingmusiclive.com/

[Chris Aitken]

Hi,
Firefox suddenly can't load anything at https://www.mixingmusiclive.com/
I don't have a firewall - no that I know of. Searching on Internet for 
things to try, but as usual hitting problems like advice is to hit Alt, 
then Tools, then Options, and, of course there is no Options. I have 
checked with the web admin and she says everything is good at her end.
Ideas?
Chris