When I try to access my boards on Firefox (65.0.1 (64 bits)), the page stays stuck on loading.
I tried deleting cookies and disable Firefox extensions, but it won't do anything.
It appears that several servers can't be accessed and a JS script can't be loaded (see attached Firefox console stack trace).
For your information, I use a proxy, but it didn't seem to cause any trouble on RealTimeBoard the past months.
Workaround : use Chrome