Warning message when loading cockpit in Firefox 50.0.2

I have these messages when I load cockpit in firefox: http://imgur.com/FUmIlm9 http://imgur.com/yJti27W $ rpm -qa|grep cockpit cockpit-125-1.fc25.x86_64 cockpit-networkmanager-125-1.fc25.noarch cockpit-storaged-125-1.fc25.noarch cockpit-shell-125-1.fc25.noarch cockpit-sosreport-125-1.fc25.noarch cockpit-bridge-125-1.fc25.x86_64 cockpit-doc-125-1.fc25.x86_64 cockpit-ws-125-1.fc25.x86_64 cockpit-docker-125-1.fc25.x86_64