diff --git a/firefox/20-manual.yml b/firefox/20-manual.yml
index fc35af3f..ae857ce9 100644
--- a/firefox/20-manual.yml
+++ b/firefox/20-manual.yml
@@ -23,4 +23,14 @@ manual:
       description: '{{ identifier }} port'
       default:
         variable: __.http_proxy.port
+
+    version:
+      description: SOCKS host version used by proxy
+      choices:
+        - v4
+        - v5
+      default: v5
+      disabled:
+        type: identifier
+        when: HTTPS
 ...