integration tests are failing when using firefox driver

[shoe]

$ npm run integration
...

Failing Scenarios: 
/home/chris/git/pioneer/test/integration/features/readwidget.feature:19
AssertionError: expected '0' to deeply equal '100'
From: Task: <anonymous>
    at /home/chris/git/pioneer/lib/support/index.js:9:3777
    at /home/chris/git/pioneer/node_modules/selenium-webdriver/lib/webdriver/promise.js:2546:12
    at promise.ControlFlow.runInFrame_ (/home/chris/git/pioneer/node_modules/selenium-webdriver/lib/webdriver/promise.js:1877:20)