message: Add iconUrl in notification
diff: @@ -346,8 +346,10 @@ browser.runtime.onMessage.addListener(function contentWindowIdListener(message)
  function notification(command, target, value) {
  let tempCount = String(notificationCount);
  notificationCount++;
  + // In Chrome, notification.create must have "iconUrl" key in notificationOptions
  browser.notifications.create(tempCount, {
  "type": "basic",
  + "iconUrl": "/icons/icons-48.png",
  "title": "Record command!",
  "message": "command: " + String(command) + "\ntarget: " + String(target[0][0]) + "\nvalue: " + String(value)
  });
  