language: node_js             # <1>
node_js: {nodeCurrentVersion}                  # <2>

addons:
  firefox: latest             # <3>

env:
- MOZ_HEADLESS=1                                      # <4>
- BROWSER_STACK_USERNAME="$BROWSER_STACK_USERNAME"    # <5>
- BROWSER_STACK_ACCESS_KEY="$BROWSER_STACK_ACCESS_KEY"

script: npm run test:browser -- --browsers Firefox