Here are some extensions I made for Epiphany, the GNOME gecko-based web browser :
A sidebar instead of a notebook to manage tabs, with internal reordering, drag and drop between different epiphany windows and text url drag and drop. See screenshot.
The close button currently sucks but I'm not yet sure about where I should put it, if you've got a better idea...
Currently incompatible with the sidebar extension.
Kevin Michel - kmichel.info@gmail.com