Some people will be uncomfortable with this default, but it's a step up from consumer ISPs who _will_ track you, to a 3rd party who Mozilla says wont.
I add Mullvad VPN (because wiregaurd is frickin awesome), which also allows you to use their DNS servers, but for this you actually have to turn off FF's DNS over HTTPS to allow the wiregaurd interface to pick up the DNS requests - they have a really good "leak" checker page while using their servers to check for various protocols https://mullvad.net/en/check/
Yes yes I know, VPN doesn't unbreak the internet, but here we are.