language: node_js
node_js:
  - "6"
  - "5"
  - "4"
before_script:
  - npm install -g gulp karma-cli
  - export DISPLAY=:99.0
  - sh -e /etc/init.d/xvfb start
branches:
  only:
    - master

language: node_js
node_js:
  - "6"
  - "5"
  - "4"
addons:
  firefox: "latest"
before_script:
  - export DISPLAY=:99.0
  - sh -e /etc/init.d/xvfb start
branches:
  only:
    - master

Add Firefox in Travis CI.
Add Firefox in Travis CI.
