Starting with Firefox 70, requests for the desktop notification permission will all be denied when the
Notification.requestPermission method is called from a cross-origin
<iframe>. Once blocked, no prompt will be displayed and web console logs a warning. According to Mozilla’s Telemetry, such permission requests are less than 0.03%, so the compatibility risk should be very low.
In the future, requests from a same-origin
<iframe> may also be denied. If you need a permission, make sure to request it from a top-level document.