title: Firefox: How to block Javascript Alert Box
body: <p>Receive an 'alert box' (not a separate pop up), where I have to click 'OK' every time I access a site</p>
  
  <p>Is there any way in Firefox to disable/block it </p>
  
  <p> <a href="https://i.imgur.com/hgPfDmr.png" rel="nofollow noreferrer">http://i.imgur.com/hgPfDmr.png</a> </p>