diff --git a/firefox/30-auto.yml b/firefox/30-auto.yml
new file mode 100644
index 00000000..77e252b6
--- /dev/null
+++ b/firefox/30-auto.yml
@@ -0,0 +1,8 @@
+%YAML 1.2
+---
+version: 1.1
+
+auto:
+  description: Automatic proxy configuration URL
+  type: web_address
+...