Having now got my girlfriends, she having exactly the same software setup as I, I am faced with a puzzling DNSSEC failure.
On my Firefox I get 4 green ticks on the cloudflare test. On this is one I get 3 green ticks. Yet all Firefox about:config are the same.
The only differences are that my Win 7 64bit PC is wire connected directly to my Sky router, however my GF’s wired connection is via a 1 Gig home wired network using a switch/hub to a Virgin router. Also, the Secure DNS result takes about 10 seconds to return, but on my PC it’s almost instantaneous.
Pictures attached. Have I missed something?