ダメだったら CircleCIで、browersを使っているのでfirefoxもインストールされているはず! [06:00:30] I/launcher - Running 1 instances of WebDriver [06:00:30] I/hosted - Using the selenium server at http://localhost:4444/wd/hub [06:01:31] E/launcher - connection refused Build info: version: '3.13.0', revision: '2f0d292', time: '2018-06-25T15:32:19.891Z' System info: host: 'f2e822041889', ip: '172.20.0.3', os.name: 'Linux', os.arch:
![Protractorのwebdriver.createSessionのエラー対処 - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/728edfa34bf3d8b12df7ccf2bd261a08f2960cec/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-9f5428127621718a910c8b63951390ad.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTkxNiZoPTMzNiZ0eHQ9UHJvdHJhY3RvciVFMyU4MSVBRXdlYmRyaXZlci5jcmVhdGVTZXNzaW9uJUUzJTgxJUFFJUUzJTgyJUE4JUUzJTgzJUE5JUUzJTgzJUJDJUU1JUFGJUJFJUU1JTg3JUE2JnR4dC1jb2xvcj0lMjMyMTIxMjEmdHh0LWZvbnQ9SGlyYWdpbm8lMjBTYW5zJTIwVzYmdHh0LXNpemU9NTYmdHh0LWNsaXA9ZWxsaXBzaXMmdHh0LWFsaWduPWxlZnQlMkN0b3Amcz1jNDVkZjQ3NDgyNWM0YzJiN2QwZmY0YzE4NmUyNWEzMw%26mark-x%3D142%26mark-y%3D112%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTYxNiZ0eHQ9JTQwa2luZ25vMjEmdHh0LWNvbG9yPSUyMzIxMjEyMSZ0eHQtZm9udD1IaXJhZ2lubyUyMFNhbnMlMjBXNiZ0eHQtc2l6ZT0zNiZ0eHQtYWxpZ249bGVmdCUyQ3RvcCZzPWY5ZWNiOWJhNmMwNmEwZDlhODZhYjcwM2IyMDFkNGY0%26blend-x%3D142%26blend-y%3D491%26blend-mode%3Dnormal%26s%3D4efab5024abc3333a9e0f78ba106e41c)