diff --git a/firefox/40-no_proxy.yml b/firefox/40-no_proxy.yml
index 85b7aab4..b5f4c743 100644
--- a/firefox/40-no_proxy.yml
+++ b/firefox/40-no_proxy.yml
@@ -10,6 +10,7 @@ no_proxy:
     allow_cidr_network: true
     allow_without_dot: true
     allow_startswith_dot: true
+  multi: true
   disabled:
     variable: _.proxy_mode
     when: No proxy