Proposed new Firefox IDN display algorithm

Gervase Markham gerv at
Tue Mar 20 16:46:11 CET 2012

Members of this list may be interested to know that the first cut of a
patch to implement UTR#39 "Moderately Restrictive" and "Highly
Restrictive", as interpreted here:
has been written for Firefox. This algorithm would be used for TLDs
which are not on our existing whitelist.

You can follow along in this bug:
and can find builds to try out here:

Feedback very much welcomed, particularly on what to do about those bits
of UTR#36 which our engineer considered too underspecified to implement,
as noted in comment #16.


More information about the Idna-update mailing list