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If your DNS server can run the server side of DoH, you could set up DoH in Firefox to use your DNS server.

Otherwise, you may be better off NOT using DoH because DoH in Firefox accesses the DNS server you configured Firefox to use, ignoring your own DNS servers and hosts file.

If there are specific domains you want to use your own DNS sever(s) to resolve, and everything else resolve via the operating system (the standard way), you can use DoH but list the specific domains in the about:config variable network.trr.excluded-domains (a comma-delimited list, no spaces) so Firefox knows that those specific domains should use the regular system DNS resolution (your DNS servers) and use DoH for the rest. Note: as shipped, localhost and local domains automatically do NOT use DoH.

Whatever way you go, you probably should give it a test before deciding everything is properly configured. :)

Good luck!
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