If you’re using either Chrome, Firefox, or Safari as your browser, you can enable desktop notifications. While enabled, a notification will appear whenever a new email message arrives in your inbox as long as you have Gmail open in a browser tab.
While desktop notifications are enabled, you'll receive a notification as long as Gmail is open in a tab in a supported browser, such as Chrome, Safari, Edge, or Firefox. That tab doesn't need to be the one you're currently browsing in. Notifications will appear in the style of your operating system; in Windows, they’ll appear in the bottom-right corner, and in macOS they’ll appear in the upper-right corner.
Click a notification when it appears.
The email that triggered the notification opens in a browser pop-up window.