Notifications allow your web applications, websites and extensions to showcase information about their actions, services and other time-sensitive messages. This notification will pop up even if you minimize the browser. You can personalize how the sites should deliver them and choose to deny or allow sites to display the notifications. To do so:
At the top right, click Menu.
Select Preferences > Privacy and Security > Site settings.
Under Permissions, select Notifications.
You can customize the notification behaviour by adding or deleting a set of URLs. Select the three dots to Edit or Remove the saved URLs.
You can customize the notification settings for a specific website.
At the top left of the address bar, click lock.
Toggle off/on the notifications.