I'm using a spry tabbed menu [also does same on accordian
menu] . When I view the menu in firefox, it has a grey dotted
border around each tab - or the whole box in the case of the
accordian. It looks just like flash animations used to before the
activate content fix.
Without seeing an example it's hard to know exactly what
specifically you are referring to, but it's been my experience that
DW is adding a border - in different shades of grey - to all
accordins and tabbed menus. You would have to go into the CSS or
code and remove the border option.