title: Remap arrow keys to another keys with JavaScript on GreaseMonkey/TamperMonkey
body: <p>I'm trying to set up a TamperMonkey script to reassign the <code>Right Arrow</code> key to <code>F</code> key.</p>
  <p>I tried this code, but so far, nothing happens when I press <code>F</code>.</p>
  <pre><code>    (function(){
  document.addEventListener('keydown', function(e) {
   // pressed F
    if (e.keyCode == 70 &amp;&amp; !e.shiftKey &amp;&amp; !e.ctrlKey &amp;&amp; !e.altKey &amp;&amp; !e.metaKey) {
    keyCode == 39 // this should trigger the right arrow
    }
  }, false);
  })();
  </code></pre>
  <p>Can someone enlighten me on this, please?</p>