Thanks for your reply to my post #72. I was just curious if Beyonder in post #57 might have run into problems in setting up Quad9 in Connection Settings. I've been working the network.trr prefs since DoH first showed up in Firefox version I-forget-the-#. Almost two years now, I think; how time flies. The screenshots do verify the default mode is 2 (fallback) even though the bootstrap data are made present in network.trr. I'd like to see an an "Enable bootstrapping" checkbox in the Connection Settings to set mode 3. I'm not holding my breath.