diff --git a/.travis.yml b/.travis.yml
index 6a16480..bc84781 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,8 +3,9 @@ node_js:
   - 6
 notifications:
   email: false
+addons:
+  firefox: "49.0"
 before_script:
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
-addons:
-  firefox: "53.0"
+script: "./node_modules/karma/bin/karma start test/karma.conf.js --browsers Firefox --single-run --no-auto-watch --capture-timeout 60000"