title: Possible issue with Chromedriver 78, Selenium can not find web element of PDF opened in Chrome
body: <p>Until my google Chrome wasn't updated to version 78 my code worked fine. I also updated the chromedriver to version 78.0.3904.70. So I am not able anymore to find WebElement with id='plugin' using Selenium WebDriver and Java:  </p>
  
  <pre><code>&lt;html&gt;
  &lt;div id="content"&gt;
  &lt;embed id="plugin" type="application/x-google-chrome-pdf" src="http://??????????/offer_printed.php?printable=yes&amp;amp;reanudar=&amp;amp;&gt;
  &lt;/div&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>Other than that part my tests are working fine. I never had a similar issue before. I also tried to find WebElement id='content' but I am receiving the same error. </p>
  
  <pre><code>WebDriverWait wait = new WebDriverWait (driver, 90);
  WebElement scrollvalid = wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("plugin")));
  
  scrollvalid.sendKeys(Keys.PAGE_DOWN);                       scrollvalid.sendKeys(Keys.PAGE_DOWN);
  </code></pre>
  
  <p>My automation script should find the PDF element and scroll the page down. Instead, I am receiving this error: 
  org.openqa.selenium.TimeoutException: Timed out after 90 seconds waiting for visibility of element located by By.id: plugin</p>
  
  <p>Is anybody facing a similar issue? Thanks in advance.</p>