diff --git a/Gruntfile.js b/Gruntfile.js
index 9a3dce09..1a88e9cd 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -140,7 +140,7 @@ module.exports = function(grunt) {
         options: {
           urls: ['http://127.0.0.1:9999/test/index.html', 'http://127.0.0.1:9999/libtextsecure/test/index.html'],
           build: process.env.TRAVIS_JOB_ID,
-          browsers: [{ browserName: 'chrome', version: '38' }],
+          browsers: [{ browserName: 'chrome', version: '38' }, { browserName: 'firefox', version: '34' }],
           testname: 'TextSecure-Browser Tests'
         }
       }