title: Firefox catching of keydown events after page load
body: <p>I've found a weird behavior in Firefox. I'm catching <code>keydown</code> events on my website and in Firefox, after the page loads, I can catch these event without no problems as long as they are not firefox reserved shortcuts.</p>
  <p>Let's say the reserved shortcut is <code>ctrl + a</code>.</p>
  <p>After the page loads, I can perform <code>ctrl + a</code> once, then if I perform it again, Firefox takes over and executes the shortcut. If I click into the page, Firefox does nothing and the event gets captured. If I load the page and click into the page straightaway, every event gets captured properly without Firefox intervening.</p>
  <p>The issue is happening only if I don't click into the page - in that case Firefox seems to take over on it's own. <code>preventDefault(), stopPropagation() or stopImmediatePropagation()</code> don't seem to help.</p>