It's possible that it's related to this: https://www.zdnet.com/article/how-to-enable-dns-over-https-doh-in-firefox/ Oh, sorry, I guess you can't see that. ;-) Go to *"*about:preferences" In the General section, scroll down to the Network Settings panel, and press the Settings button. In the popup, scroll down and look for "Enable DNS over HTTPS". **