Today I've found something that seems interesting: Epilicious. From the officila homepage : "Epilicious is an extension for the Gnome web browser Epiphany. It lets you synchronise your local bookmarks with the bookmarks in a Delicious account. It still quite rough around the edges, but fully usable." I discovered del.icio.us and I want to give it a try ;)
AFAIK this is going to be included in next version of epiphany-extensions
*** This bug has been marked as a duplicate of 141953 ***