static gboolean
change_location_cb (EphyEmbed *embed,
		    const char *uri,
		    EphyWindow *window)
{
	LOG ("Changing location of window %p to %s\n", window, uri);
	return FALSE;
}


static void
impl_attach_tab (EphyExtension *ext,
		 EphyWindow *window,
		 EphyTab *tab)

{
	LOG ("attach tab (window %p)", window);
	g_signal_connect_object (ephy_tab_get_embed (tab), "ge_location",
			 	 G_CALLBACK (change_location_cb),
				 window, 0);
}

------------------------------------------------------------------
prints:

attach tab (window 0x82f4ce0)
Changing location of window 0x82f4ce0 to about:blank
Changing location of window 0x82f4ce0 to myhomepage

whenever I open a new window, but prints:

attach tab (window 0x82f4ce0)
Changing location of window 0x82f4ce0 to myhomepage

if I open a new tab.