What you could do is check the Block new requests asking to allow notifications option in the Notifications Permissions section of the Firefox settings page. This stops websites from asking for notifications. Then, if you want to use notifications on a certain website, you can use the Permissions section of the Firefox Page Info window to override the default permission for Send Notifications and set it to Allow instead.

Hope this helps.

Hi jvigorito,

From what I understand you would like the ability to block notifications except a spare few is that correct?

You can check the Permissions that will specify which websites are allowed to send you under Notifications.

To do this :

1. Click the 3-bar menu
2. Click Options
3. Click the Privacy & Security on the left panel
4. Under Permissions, to the right of Notifications, click Settings...
5. Check mark Block new requests asking to allow notifications
6. From here, you can list the websites that allow or also block notifications.

See also : Web Push notifications in Firefox {link}