messages

Action          Origin          Destination         Parameters
-----------------------------------------------------------------
translate       any frame       top frame           term, context
close           any frame       top frame
window          top frame       event page
unhighlight     top frame       all frames
browser_action  event page      top frame
selection_mode  top frame       all frames          enabled
toggle_links    zeeguu frame    dict frame          enabled
contribute      dict frame      top frame

get_state       any frames      event page          
update_state    any frames      event page          state
state           event page      any frames          state