diff --git a/.travis.yml b/.travis.yml
index 0e5ab82..52f2f59 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,8 @@
+env:
+  - MOZ_HEADLESS=1
+addons:
+  chrome: stable
+  firefox: latest
 language: node_js
 node_js:
    - "6.11"
@@ -5,7 +10,8 @@ node_js:
    - "8.9"
 before_install: npm install -g npm
 install: npm install
-before_script: # - export CHROME_BIN=chromium-browser
+before_script:
+  - export CHROME_BIN=chromium-browser
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
   - sleep 3 # give xvfb some time to start
diff --git a/karma.conf.js b/karma.conf.js
index 1500acb..3096ab1 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -94,6 +94,7 @@ module.exports = config => {
             //'ChromeCanary',
             //'Safari',
             //'Firefox',
+            'FirefoxHeadless',
         ],
         logLevel: config.LOG_INFO,
         client: {