In Firefox about:config, setting "network.IDN_show_punycode" to true is the workaround for the moment (works on the proof-of-concept example at least).
-- "It might be a vision--of a shell, of a wheelbarrow, of a fairy kingdom on the far side of the hedge; or it might be the glory of speed; no one knew." --Mrs. Ramsay, speculating on why her little daughter might be dashing about, in "To the Lighthouse," by Virginia Woolf.
