{
  "verbose": false,
  "plugins": {
    "local": {
      "browsers": ["chrome"]
    },
    "sauce": {
      "disabled": false,
      "browsers": [{
        "browserName": "microsoftedge",
        "platform": "Windows 10",
        "version": ""
      }, {
        "browserName": "internet explorer",
        "platform": "Windows 8.1",
        "version": "11"
      }, {
        "browserName": "safari",
        "platform": "OS X 10.11",
        "version": "9"
      }]
    }
  }
}
{
  "verbose": false,
  "plugins": {
    "local": {
      "browsers": ["chrome", "firefox"]
    },
    "sauce": {
      "disabled": false,
      "browsers": [{
        "browserName": "microsoftedge",
        "platform": "Windows 10",
        "version": ""
      }, {
        "browserName": "internet explorer",
        "platform": "Windows 8.1",
        "version": "11"
      }, {
        "browserName": "safari",
        "platform": "OS X 10.11",
        "version": "9"
      }]
    }
  }
}

Use latest Firefox for travis testing
Use latest Firefox for travis testing