diff --git a/foxyproxy/10-redefine.yml b/foxyproxy/10-redefine.yml
new file mode 100644
index 00000000..bc50e801
--- /dev/null
+++ b/foxyproxy/10-redefine.yml
@@ -0,0 +1,18 @@
+%YAML 1.2
+---
+version: 1.1
+
+proxies:
+
+  username:
+    redefine: true
+    mandatory: false
+
+  password:
+    redefine: true
+    hidden:
+      jinja: |-
+        {{ not _.username }}
+      return_type: boolean
+      description: if username is empty
+...