What you need is a myspell dictionary. This is the same dictionary format
used by OpenOffice. I don't know whether we have any good documentation on
the format, though the web probably does.
Once you have the .aff and .dic files, let the Turkish l10n team know and
they can create the extension using my dictionary-packager tool. Setting
followup to mozilla.dev.l10n... there may already be a Turkish dictionary in
the works, so let's ask there.
--BDS
I once created a Turkish dictionary, but it's far from being good to be
used. So I never released it.
If you email me, I can share it with you.
Serkan
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Mozilla Türkiye
http://mozilla.org.tr