STRANGE problem reaching https://manpages.debian.org/

[Richard Owlett <rowlett@cloud85.net>]

I'm running Debian 9 installed via netinst in February with some 
packages added via Synaptic and run neither Update nor Upgrade explicitly.

My browser is SeaMonkey 2.49.1 downloaded from 
https://www.seamonkey-project.org/ . I have no 
add-ins/add-ons/extensions/etc installed.

I routinely browse with JavaSript disabled.

I've not had any problems with https://manpages.debian.org/ in the past.
This morning I'd visited a site which required JavaScript.
Without having disabled JavaScript I attempted to visit 
https://manpages.debian.org/ .
It never loaded. There were NO error messages.
After disabling JavaScript there was no problem reaching the site.
I repeated the enable/disable JavaSript sequence several times.
The problem is repeatable.