Windows menu should represent each stack as a submenu
It would be great that the Windows menu represent each stack as a submenu. And when all tabs are from the same host the submenu parent title should be that host name. Example: Tab A ..... google.pt > | Search "stock markest" .... | Search "hot cars" Tab Z
Good for those who open loads of tabs, not good for those who do not.
Submenus reduce accessibility.
A collapsible tree like in the Bookmarks Panel would be better.