Frank, obviously you have to install Chinese fonts. Title bar is managed
by the OS, even though Firefox has its own Chinese fonts to show pages
To do that in XP, it’s quite simple. Choose ‘Regional and Language
Options’ in the control panel, then in the ‘Languges’ tab, check
‘Install files for East Asian languages’. And later in the ‘Advanced’
tab, select ‘Chinese(PRC)’ as the option of ‘Language for non-Unicode
programs’. You may need an XP installation CD and have to restart once.
That’s all for properly showing the title bar.
That’s bizarre cause I am using Firefox (English) with XP too and I see