title: Selenium - MoveTargetOutOfBoundsException with Firefox
body: <p>I'v got problem with function <strong>move_to_element</strong> on <strong>Firefox</strong> Webdriver (Chrome, IE works well)</p>
  
  <pre><code>driver = webdriver.Firefox()
  driver.get("https://stackoverflow.com")
  time.sleep(5)
  source_element = driver.find_element_by_xpath('//*[@id="footer"]/div/ul/li[1]/a')
  ActionChains(driver).move_to_element(source_element).perform()
  </code></pre>
  
  <p>I am working with these versions:  geckodriver - 0.17.0 //  Firefox     - 54.0 // selenium    - 3.4.3</p>
  
  <p>After running this script, on output shows:</p>
  
  <pre><code>selenium.common.exceptions.MoveTargetOutOfBoundsException: Message: (134.96666717529297, 8682.183013916016) is out of bounds of viewport width (1268) and height (854) 
  </code></pre>