If you aren't receiving notifications on WhatsApp for web, make sure your browser is properly configured:
Click Turn on desktop notifications in the blue banner at the top of the chat list.
Follow the instructions on the screen and click Allow Notifications.
If you don't see the blue banner, refresh the page. If you still don't see the banner, you may have muted or turned off notifications from WhatsApp settings. Learn how to configure your notification settings in this article.
You can unblock notifications by doing one of the following:
https://web.whatsapp.comis set to Block, highlight it and click Remove Site > Save Changes.
You can learn more about Firefox notifications on the Mozilla Support website.