--- a/toolkit/components/extensions/parent/ext-privacy.js
+++ b/toolkit/components/extensions/parent/ext-privacy.js
@@ -103,17 +103,17 @@ ExtensionPreferencesManager.addSetting("
         break;
 
       case "default_public_interface_only":
         prefs["media.peerconnection.ice.default_address_only"] = true;
         prefs["media.peerconnection.ice.no_host"] = true;
         break;
 
       case "disable_non_proxied_udp":
-        prefs["media.peerconnection.ice.proxy_only"] = true;
+        prefs["media.peerconnection.ice.relay_only"] = true;
         break;
     }
     return prefs;
   },
 });
 
 ExtensionPreferencesManager.addSetting("services.passwordSavingEnabled", {
   prefNames: [