message: Pin Firefox to version 66.0 on Travis because of geckodriver+67.0 bug.
diff: @@ -42,14 +42,14 @@ matrix:
  - node_js: '8'
  addons:
  chrome: stable
  - firefox: latest
  + firefox: '66.0'
  env:
  - TEST_COMMAND="xvfb-run npm run test:integration"
  - node_js: '10'
  addons:
  chrome: stable
  - firefox: latest
  + firefox: '66.0'
  env:
  - TEST_COMMAND="xvfb-run npm run test:integration"
  