build: Add firefox stable

Author: germanattanasio

.travis.yml

@@ -1,9 +1,11 @@
 language: node_js
 node_js: 10
 sudo: required
+before_install:
+- export DISPLAY=:99.0
 addons:
-  - chrome: stable
-
+  chrome: stable
+  firefox: "60.0"
 script:
 - npm run build
 - npm test

karma.conf.js

@@ -52,7 +52,7 @@ module.exports = function(config) {
     // there's a handy list of chrome flags at
     customLaunchers: {
       ChromeWithPrerecordedMic: {
-        base: 'Chrome',
+        base: 'ChromeHeadless',
         // --no-sandbox is required for travis-ci
         flags: [
           '--use-fake-device-for-media-stream',

package-lock.json

@@ -54,7 +54,7 @@
     "jsdoc": "^3.6.3",
     "karma": "^4.3.0",
     "karma-browserify": "^6.1.0",
-    "karma-chrome-launcher": "^2.2.0",
+    "karma-chrome-launcher": "^3.1.0",
     "karma-eslint": "^2.2.0",
     "karma-express-http-server": "0.0.1",
     "karma-firefox-launcher": "^1.2.0",