diff --git a/.travis.yml b/.travis.yml
index 1aa2dc4..91322d8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,8 @@ language: php
 php:
 - 5.5
 - 5.6
+addons:
+  firefox: "44.0"
 matrix:
   allow_failures:
     - php: 5.6