Enable right click (credit: https://stackoverflow.com/questions/21335136/how-to-re-enable-right-click-so-that-i-can-inspect-html-elements-in-chrome)

right-click.js

function enableContextMenu(aggressive = true) {
  void(document.ondragstart=null);
  void(document.onselectstart=null);
  void(document.onclick=null);
  void(document.onmousedown=null);
  void(document.onmouseup=null);
  void(document.body.oncontextmenu=null);
  enableRightClickLight(document);
  if (aggressive) {
    enableRightClick(document);
    removeContextMenuOnAll('body');
    removeContextMenuOnAll('img');
    removeContextMenuOnAll('td');
  }
}

function removeContextMenuOnAll(tagName) {
  var elements = document.getElementsByTagName(tagName);
  for (var i = 0; i < elements.length; i++) {
    enableRightClick(elements[i]);
    enablePointerEvents(elements[i]);
  }
}

function enableRightClickLight(el) {
  el || (el = document);
  el.addEventListener('contextmenu', bringBackDefault, true);
}

function enableRightClick(el) {
  el || (el = document);
  el.addEventListener('contextmenu', bringBackDefault, true);
  el.addEventListener('dragstart', bringBackDefault, true);
  el.addEventListener('selectstart', bringBackDefault, true);
  el.addEventListener('click', bringBackDefault, true);
  el.addEventListener('mousedown', bringBackDefault, true);
  el.addEventListener('mouseup', bringBackDefault, true);
}

function restoreRightClick(el) {
  el || (el = document);
  el.removeEventListener('contextmenu', bringBackDefault, true);
  el.removeEventListener('dragstart', bringBackDefault, true);
  el.removeEventListener('selectstart', bringBackDefault, true);
  el.removeEventListener('click', bringBackDefault, true);
  el.removeEventListener('mousedown', bringBackDefault, true);
  el.removeEventListener('mouseup', bringBackDefault, true);
}

function bringBackDefault(event) {
  event.returnValue = true;
  (typeof event.stopPropagation === 'function') && event.stopPropagation();
  (typeof event.cancelBubble === 'function') && event.cancelBubble();
}

function enablePointerEvents(el) {
  if (!el) return;
  el.style.pointerEvents='auto';
  el.style.webkitTouchCallout='default';
  el.style.webkitUserSelect='auto';
  el.style.MozUserSelect='auto';
  el.style.msUserSelect='auto';
  el.style.userSelect='auto';
  enablePointerEvents(el.parentElement);
}

enableContextMenu();