Why are Cyrillic second-level domains displayed in punycode in Firefox?

Question

Domain name market

Good afternoon, residents of Habr.
Tell me if anyone knows.
Why is the domain domain.com in Firefox displayed in punycode, while the full Cyrillic domain president.rf and the third-level domain domain.com.ua are displayed normally?

Ubuntu 11.10:
Firefox 8 issue
In Chrome and Opera the address is in utf, i.e. understandable

Answer 1

The display of Cyrillic domains is configured in Firefox in about:config.
There are Network.IDN_show_punycode and Network.IDN.whitelist.* settings (where * can be a domain).
president.rf is displayed in Cyrillic - it means network.IDN.whitelist.xn--p1ai is true
domain.com.ua in Cyrillic - it means network.IDN.whitelist.ua is true
If you want domain.com to be displayed not in punycode create a boolean field network.IDN.whitelist.com with a value of true.
Read more:
http://kb.mozillazine.org/Network.IDN.whitelist.*
http://kb.mozillazine.org/Network.IDN_show_punycode

Answer 2

Yes you are right!
I found IDN_show_punycode myself, but I still had it set to false.
Thanks for the whitelist.
Surprisingly, the .com domain is not on this list!
Do you think it is worth writing to them, attaching a bunch of Cyrillic domains in the .com zone as a justification for the need to include this domain in future versions? Or maybe I'm not the first?

Answer 3

Thank you!
Here for Waterfox a fresh profile set up, it works:
----------------------------------------- -----------------------
Display .rf and .online
-------------------- ---------------------------------------------------
Disable
IDN_show_punycode - -- > false
Create boolean
network.IDN.whitelist.xn--p1ai --> true
network.IDN.whitelist.xn--80asehdb --> true