diff --git a/hosts/common/programs/firefox/default.nix b/hosts/common/programs/firefox/default.nix
index f83979bdc..822ccdef3 100644
--- a/hosts/common/programs/firefox/default.nix
+++ b/hosts/common/programs/firefox/default.nix
@@ -219,6 +219,9 @@ in
       // see: <https://librewolf.net/docs/faq/#im-getting-sec_error_ocsp_server_error-what-can-i-do>
       defaultPref("security.OCSP.require", false);
 
+      // DISABLE DNS OVER HTTPS; use the system resolver.
+      defaultPref("network.trr.mode", 5);
+
       // scrollbar configuration, see: <https://artemis.sh/2023/10/12/scrollbars.html>
       // style=4 gives rectangular scrollbars
       // could also enable "always show scrollbars" in about:preferences -- not sure what the actual pref name for that is