title: Error on uploading file using webdriver in firefox
body: <p>To upload image on the field in this URL: <a href="http://demoqa.com/registration/" rel="nofollow noreferrer">http://demoqa.com/registration/</a> 
  I used the following code that works on chrome but not on Firefox. May I please know the reason and solution?</p>
  
  <pre><code> WebDriver driver;
          System.setProperty("webdriver.gecko.driver","C:\\Users\\abc\\Desktop\\Selenium\\geckodriver-v0.17.0-win64\\geckodriver.exe");
         driver = new FirefoxDriver();
          driver.get("http://demoqa.com/registration/");
  
  WebElement elementUpload=driver.findElement(By.xpath("//*[@id='profile_pic_10']"));
  WebDriverWait wait=new WebDriverWait(driver, 30);
  wait.until(ExpectedConditions.elementToBeClickable(elementUpload));
  
  elementUpload.sendKeys("D:\\roboraid.jpg");
  </code></pre>
  
  <p>Error shown here is:</p>
  
  <pre><code>Exception in thread "main" org.openqa.selenium.InvalidArgumentException: File not found: C:\Users\Public\Pictures\Sample Pictures\Chrysanthemum.jpg
  </code></pre>