michel_ouba/FF_arkenfox_user.js
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FF_arkenfox_user.js
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punycode test 

and the PoC/article by Xudong Zheng that re-sparked the conversation early this year
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Thorin-Oakenpants 2017-05-28 12:49:27 +12:00 committed by GitHub
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user.js
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@ -1313,10 +1313,12 @@ user_pref("security.block_script_with_wrong_mime", true);
* Firefox has *some* protections to mitigate the risk, but it is better to be safe
* than sorry. The downside: it will also display legitimate IDN's punycoded, which
* might be undesirable for users from countries with non-latin alphabets
* [TEST] https://www.xn--80ak6aa92e.com/ (www.apple.com)
* [1] http://kb.mozillazine.org/Network.IDN_show_punycode
* [2] https://wiki.mozilla.org/IDN_Display_Algorithm
* [3] https://en.wikipedia.org/wiki/IDN_homograph_attack
* [4] CVE-2017-5383: https://www.mozilla.org/en-US/security/advisories/mfsa2017-02/ ***/
* [4] CVE-2017-5383: https://www.mozilla.org/en-US/security/advisories/mfsa2017-02/
* [5] https://www.xudongz.com/blog/2017/idn-phishing/ ***/
user_pref("network.IDN_show_punycode", true);
/* 2673: enable CSP (Content Security Policy) (default is true)
* [1] https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP ***/