I’m visually impaired, and I use the zooming feature of Windows. In this context, I can see only a part of the display at a time, and I often miss the notifications pop-ups.
With Firefox, there is a very good feature that add a white dot under the icon of the tab in the case a notification from the tab has been emitted. This is helping me a lot.
It would be very useful to have this, or any other visual marker in the tab header when a notification arrives.