Notifications now favour the longer notification, (assuming you're running a relatively up to date master) you do receive a notification for each open tab though unfortunately.
Notifications are not cleared
Clicking on the Notifications icon, then See all notifications then on Mark All as Read does not do what it's intended to do.
The notifications are still on the page, even though it says they are cleared successfully.
@planner - no worries, that button's deprecated, and is gone in the latest build now.