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@Morisatos Thanks again.
I just add "@" to white list of URL characters pattern.

Multibyte(Japanese) support version is here.
http://knoa.jp/up/linkification.1.3.8.mb.xpi
# It detect urls/mails by white characters list. (by black list in the original.)
# It uses pretty simple regex, but may be better in general browsing.
# I rerwite Firefox support version for 10.*. :-)

test case:
http://knoa.jp/up/linkification.txt

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