You can manage your notification subscription by clicking on the icon
To start receiving timely alerts, as shown below click on the Green lock icon next to the address bar
Click it and Unblock the Notifications
To Start receiving timely alerts please follow the below steps:
Click on the Menu icon of the browser, it opens up a list of options.
Click on the Options , it opens up the settings page,
Here click on the Privacy & Security options listed on the left hand side of the page.
Scroll down the page to the Permission section .