diff --git a/firefox/20-manual.yml b/firefox/20-manual.yml
index 26c6d09..7ea057b 100644
--- a/firefox/20-manual.yml
+++ b/firefox/20-manual.yml
@@ -30,3 +30,13 @@ manual:
       description: "{{ identifier }} port"
       default:
         variable: manual.http_proxy.port
+
+    version:
+      description: SOCKS host version used by proxy
+      choices:
+        - v4
+        - v5
+      default: v5
+      disabled:
+        type: identifier
+        when: 'HTTPS'