[tutorial v1.1_142] A web_address variable

firefox/60-dns_over_https.yml

@@ -16,4 +16,13 @@ dns_over_https:  # DNS over HTTPS
     disabled:
       variable: _.enable_dns_over_https
       when: false
+
+  custom_dns_url:
+    description: Custom DNS URL
+    type: web_address
+    disabled:
+      jinja: |-
+        {{ _.provider is propertyerror or _.provider != 'Custom' }}
+      return_type: boolean
+      description: if "_.provider" is not "Custom"
 ...