contextmenu FF click

by Sergey Kulikov

HTML

<button>Right click to Show popup</button>
<div class="popup">Goes away in Firefox 65 and 66</div>

CSS

.popup {
  display: none;
}

JavaScript

const popup = document.querySelector('.popup');

document.querySelector('button').addEventListener('contextmenu', e => {
	e.preventDefault();
  popup.style.display = 'block';
});

document.addEventListener('click', e => {
  popup.style.display = 'none';
});