Note: This extension is unmaintained as I think there is little utility with the new header-bar GNOME apps. Shows the title of window when scrolled on the appMenu button. Useful with extension Maximus (best used with quit button and window button extensions) where title bar is hidden. It does not replace the default app name box. Instead button placed on its left(with mouse over and mouse out- no clicking)

Extension Homepage

https://github.com/meghprkh/wintitle