title: WebDriver / stuck when open upload file window
body: <p>I use my WebDriver, with FireFox.</p>
  
  <p>I have an elemnt: //input[@class="uploadFiles"], when I click on it by:
  driver.findElement(By.xpath("//input[@class="uploadFiles"]")), a windows of upload a file (Windows OS's  window) is opened, but the test doesn't continue to the next line, and get stuck.</p>
  
  <p>Any help?</p>