message: using latest beta instead of nightly
  nightly is crashing on Travis-CI with the error "stack smashing detected"
diff: @@ -34,7 +34,7 @@ jobs:
  env : BROWSER=firefox
  os: linux
  addons:
  - firefox: latest-nightly
  + firefox: latest-beta
  - stage: test
  before_script:
  # needs an audio output device to run
  