diff --git a/.travis.yml b/.travis.yml
index 1cfe8da..d9bd750 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,8 @@
 language: node_js
 node_js:
   - "6"
+addons:
+  firefox: "55.0"
 before_script:
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start