Cannot get my phone's default DNS resolver to be used by Firefox. My network has an intranet complete with it's own DNS, which my phone's receives via DHCP. Android 'Private DNS' is turned off. The routing on my network is fine, as evidenced by being able to access my intranet from other mobile browsers on the same device. All add-ons are turned off, as well as 'Enhanced Tracking Protection' and 'HTTPS-Only Mode'. Any explanations, or more importantly, suggestions?