I moved back to using the ion window manager today (ion2 to be precise). Having tabs in my window manager, I no longer needed them in my web browser, which at the moment is epiphany. I couldn't find a way of disabling them or an extension to do it so I wrote my own.
It's at /code/epiphany/, works for the epiphany in Etch but not in sid: it seems the GNOME people have disabled the "Detach Tab" functionality I was relying on.
I think I can get it working in the later epiphany versions with a bit more work.