I also noticed that when you look at the Notifications page, you can tell which ones have new content ...BUT once you look at one, it unmarks all of them UGH so if someone replied to something Im involved in, its easy for me to miss and go back to that post.....Again, Im using the Right Click, Open in new tab to avoid this behavior.

Each notification should remain "highlighted" (for lack of a better description), until Ive clicked on it.