Close a tab group when there's only one remaining tab

[Anrojaslat]

So I am sometimes browsing a particular website and open a few tabs in the same group. After a while, I’ll end up reading the new tabs and close them, leaving the main remaining tab open. I’d expect that group to close up and disappear, while I can keep the main tab open to continue reading in the following days. Currently what happens is that the group remain active with a single tab, making it necessary for me to click twice whenever I want to return to this tab from another one.