title: removeEventListener without knowing the function
body: <p>Some of the third party plugin will attach the <code>eventListener</code> into the site. How to I remove the eventListener without knowing the function that attached. </p>
  
  <p>I refer this <a href="https://developer.mozilla.org/en/docs/Web/API/EventTarget.removeEventListener" rel="noreferrer">removeEventListener</a> but I can't get any clue to remove this. </p>
  
  <p>Eg: <code>getEventListeners(window)</code> shows the events attached. But, when I try to remove the event using <code>window.removeEventListener("eventname")</code> is not working without knowing that function. </p>
  
  <p>Please help, Thanks in advance.  </p>