In order to stream Seenspire content correctly, there are certain URLs that must be added to your firewall's whitelist.
http(s)://*.seenspire.com/*
http(s)://www.gstatic.com/firebasejs/*
http(s)://twemoji.maxcdn.com/*
http(s)://*.firebaseio.com/*
http(s)://*.googleapis.com/*
http(s)://*.web.app/*