A client want to keep employees focused on their tasks, and remove distractions such as the facebook notifications and news items that keep popping up on the users computer. My first reaction was to set browsers to deny Notification requests. This works great to prevent new sites from being added to the allowed notifications, but sites that are already there retain the ability to send notifications. So I added the option to move up a level and just block the browser from sending notifications as a system setting which prevents browsers from sending notifications alltogether. In situations where that isn’t going to make a difference, I decided to turn off browsers from in System -> Notifications. If it is a new system, setting this setting to Deny will prevent users from adding any sites to the allowed list.