diff --git a/ws-firefox.json b/ws-firefox.json
index 95583c3..8bc1a47 100644
--- a/ws-firefox.json
+++ b/ws-firefox.json
@@ -2,6 +2,6 @@
     "layout": "tabbed",
     "percent": 1,
     "nodes": [
-        {"swallows": [{"class": "^Firefox$"}]},
+        {"swallows": [{"class": "^Firefox$"}]}
     ]
 }