diff --git a/firefox/60-dns_over_https.yml b/firefox/60-dns_over_https.yml
index c121470..cd5be39 100644
--- a/firefox/60-dns_over_https.yml
+++ b/firefox/60-dns_over_https.yml
@@ -13,3 +13,13 @@ dns_over_https:  # DNS over HTTPS
     disabled:
       variable: dns_over_https.enable_dns_over_https
       when: false
+
+  custom_dns_url:
+    description: Custom DNS URL
+    type: web_address
+    disabled:
+      jinja: |
+        {% if dns_over_https.provider is propertyerror or dns_over_https.provider != 'Custom' %}
+        provider is not custom
+        {% endif %}
+      description: if "dns_over_https.provider" is not "Custom"