Mactinosh user here.
In Twitter, when I cmmd-cilck on a tweet, it opens a new tab with that tweet. My preferred way to read tweets is to cmmd-click every one that I’m interested in from the main page and then close the main Twitter window. I may end up with a half-dozen for later perusal.
When I close tha meain window, all of the tweets in the new tabs close along with it. I just want to close the main window tab, not all of the new ones.