SeleniumTunnel not working for Firefox on OSX about digdug HOT 2 CLOSED

{
    tunnelOptions: {
        // this tells SeleniumTunnel to download geckodriver
        drivers: [ 'firefox' ] 
    },

    environments: [
        // the `marionette: true` flag tells Selenium to use gecko driver
        // instead of Firefox driver, which it still defaults to
        { browserName: 'firefox', marionette: true }
    ],

    // geckodriver doesn't yet allow accessing global variables, so you can't use
    // code coverage instrumentation with it
    excludeInstrumenation: true
}