Greek polytonic is the historic (traditional) way to write Greek. Spell-checking in Greek polytonic needs its own dictionary. This can be accomplished, either by a new language entry (i.e. two Greek "languages", Greek and Greek polytonic, just like English US and English UK or Chinese simplified and Chinese traditional), or by a new dictionary within the existing Greek language entry (i.e. one language, Greek, with two dictionaries available, Greek and Greek polytonic). The first option is already used by Wordpress. I am available to help implement any of the above two options in Firefox. Please, advise.