title: How to block browser notifications/alerts on exit?
body: <p>How can I block abusive browser notifications/alerts on exit that prevent the closing of tabs, such as this one:</p>
  
  <p><a href="https://i.stack.imgur.com/UEifI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UEifI.png" alt="enter image description here"></a></p>
  
  <p>Note: Notifications are <strong>already</strong> turned off in the browser's content settings on</p>
  
  <p><em>chrome://settings/content/notifications?search=notif</em></p>
  
  <p>and I do NOT want to manually add a site every time. I am using Chromium on Debian 9.</p>