The latest version of Firefox v74 blocks access to the Sailwave web site. There is no way round this with this version of Firefox. The issue is with operating system on the server hosting the Sailwave website.
The problem is understood and investigation is underway to see if the problem can be solved.
Currently both Microsoft Edge & Google Chrome do not have the same issue. I do not know about Apple Safari browser as I do not have access to a Mac system
Kind regards,
Huw