[snailmailman]

You can change your DoH resolver, so you could setup a raspberry pi as a DoH server theoretically, and still keep the benefits of a PiHole. Mozilla is making CloudFlare the default but they aren't forcing it, you can use another server.

[syshum]

My Browser should not be doing this at all in the first place,

I should not have to dig deep into the internals of Firefox to opt-out of sending all my traffic to CloudFlare, a company proven time and time again to be pro-censorship and anti-competitive

[freeone3000]

You can change it on web browsers, for now, but not on IoT devices.

[dzhiurgis]

What sort of IoT device uses Firefox???

[joombaga]

I'm not aware of any IoT devices with non-configurable DoH.

[judge2020]

It's coming in the future, likely soon we'll see it in Google hardware since they all auto-update.