title: unable to connect to chromedriver
body: <p>I use capybara &amp; selenium test my rails project. when i execute the test script,it's has errors likes this </p>
  
  <pre><code> Selenium::WebDriver::Error::WebDriverError:
     Could not find Firefox binary (os=macosx). Make sure Firefox is installed or set the path manually with Selenium::WebDriver::Firefox::Binary.path=
  </code></pre>
  
  <p>I google <a href="https://stackoverflow.com/questions/6821659/cucumber-selenium-webdriver-how-to-use-google-chrome-as-the-testing-browser-i">how to use Google Chrome as the testing browser instead of Firefox</a></p>
  
  <p>but it occurs other errors likes </p>
  
  <pre><code>Selenium::WebDriver::Error::WebDriverError:
     unable to connect to chromedriver http://127.0.0.1:9515
  </code></pre>