Best answer as chosen by user blaqc: That would be difficult.

The Window title is recognised as such by the OS, and so it's accessible for other programs via some Windows API.

Tabs are just something inside the memory space of the browser, or the pdf-viewer (f.e. Foxit reader) or editor (for example Editpad) or - in fact - any program whose designer and programmer thinks it should have a user interface with tabs. And there's no standard way they offer information about such tabs to the outside world. So it's kind of impossible to present that information the way you would like to see it.

The only thing you can do is to have multiple browser windows open in stead of one browser window with tabs.