This is has already been resolved. There is a toggle that is off by default. Firefox has DoH on by default, I run a pi-hole, I don’t want my DNS going to CloudFlare. I use both, and Sidekick and Tor. You need to segment your activities to different browsers, that is basic OPSEC. I hope you have more than one email address, and use an anonymous forwarder. Just don’t use Chrome.