diff --git a/.travis.yml b/.travis.yml
index 14f56a0..db4c89b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,9 @@ language: php
 
 sudo: false
 
+addons:
+  firefox: "47.0.1"
+
 cache:
   directories:
     - $HOME/.composer/cache