Opens magnet links in a new tab. This is useful if you have a website registered as a handler for magnet:// links (such as instant.io, or Deluge Web)

magnet-new-tab.js

// ==UserScript==
// @name Magnet Links in New Tab
// @namespace Violentmonkey Scripts
// @match https://thepiratebay.*/*
// @match *://audiobookbay.*/*
// @grant none
// ==/UserScript==

const poll = (action, regularity) => {
   action();
  
   setTimeout(() => poll(action, regularity), regularity);
}

const openMagnetsInNewTab = () => {
  const untargeted = document.querySelectorAll("a[href^='magnet']:not([target])");
  for (const a of untargeted)
    a.setAttribute('target', '_blank');
}

poll(openMagnetsInNewTab, 1000);