I am using Safari version 12.1 (13607.1.40.1.5).
If I go to Safari-> Preferences-> Extensions shows that I do not have any extensions installed.
When I visit http://kmlviewer.nsspot.net, I press the button "choose a file" and I select a kml file. I receive the message:
"Please disable the adblock for free use."
If I go to Safari-> Settings for this website, "Enable Content Blockers" is unchecked, "AutoPlay" is set to "Allow AutoPlay", and "Pop-up Windows" is set to "Allow"
I do not see any other settings that could further disable ad blocking. Is there anything else I can do?
There are several examples of kml files, but you can use the text of:
and easily create your own .kml file.