Odd link behavior from https://manpages.debian.org/buster/apt/apt-cdrom.8.en.html

[Richard Owlett <rowlett@cloud85.net>]

My browser is SeaMonkey { Mozilla/5.0 (X11; Linux i686; rv:52.0) 
Gecko/20100101 Firefox/52.0 SeaMonkey/2.49.4}
My OS is Debian 9.13

When I click on *ANY* of the links from
    https://manpages.debian.org/buster/apt/apt-cdrom.8.en.html
I never finish connecting.

However if I enter the reference in the box at 
https://manpages.debian.org/ I connect instantly. The URL in the 
browser's address bar is visibly the same whether or not the connection 
was successful.