diff --git a/.travis.yml b/.travis.yml
index 6e22617f7..c28ac5487 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,6 +28,7 @@ env:
   - EMBER_TRY_SCENARIO=ember-beta
   - EMBER_TRY_SCENARIO=ember-canary
   - EMBER_TRY_SCENARIO=ember-default
+  - EMBER_TRY_SCENARIO=ember-default TESTEM_LAUNCH=Firefox
 
 matrix:
   fast_finish: true
diff --git a/testem.js b/testem.js
index 234f37bf3..9dbd5433d 100644
--- a/testem.js
+++ b/testem.js
@@ -1,7 +1,7 @@
 module.exports = {
   test_page: 'tests/index.html?hidepassed',
   disable_watching: true,
-  launch_in_ci: ['Chrome'],
+  launch_in_ci: process.env.TESTEM_LAUNCH ? process.env.TESTEM_LAUNCH.split(',') : ['Chrome'],
   launch_in_dev: ['Chrome'],
   browser_args: {
     Chrome: {
@@ -16,5 +16,9 @@ module.exports = {
         '--window-size=1440,900',
       ].filter(Boolean),
     },
+    Firefox: {
+      mode: 'ci',
+      args: ['--headless', '--window-size=1440,900'],
+    },
   },
 };