diff --git a/package.json b/package.json
index 8274dae..ee928d6 100644
--- a/package.json
+++ b/package.json
@@ -93,7 +93,8 @@
     "mocha": "~2.0.1",
     "run-sequence": "^1.0.2",
     "karma": "^0.12.28",
-    "karma-mocha": "^0.1.9"
+    "karma-mocha": "^0.1.9",
+    "karma-firefox-launcher": "^0.1.3"
   },
   "license": "MIT"
 }