Sorry, I finally found that is because of my mistake in fontconfig.
But still confusing that why the problem is not occurred in ff2.
** Changed in: firefox-3.0 (Ubuntu)
Status: New = Invalid
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Indeterminate font selection of firefox 3.0
https://bugs.launchpad.net/bugs/242303
You
** Attachment added: ff-font-selection.jpeg
http://launchpadlibrarian.net/15531624/ff-font-selection.jpeg
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Indeterminate font selection of firefox 3.0
https://bugs.launchpad.net/bugs/242303
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