Quote:Mozilla plans to switch the notification system that Firefox uses on Windows 10 devices to the operating system's native notification system soon.
Firefox users who run a Nightly version of the web browser on a Windows 10 device may have noticed that the browser uses the operating system's notification system to display notifications to the user.

The browser's old notification system is a custom designed on that remains the default on some versions of Windows.

The two screenshots below show the new notification prompt and the old notification prompt of the Firefox browser.

Full reading: https://www.ghacks.net/2018/10/08/firefox-gets-native-windows-10-notifications-support/