Does anybody know what font is used to show message headers pane in
Thunderbird (Mozilla Mail client)? Or, better yet how to change it?

Here is the problem: whatever is the font, the bold cyrillic letters are
exactly the same as non-bold, which makes it difficult to see unread
messages with cyrillic subjects.

I am not sure whose problem this is, but unlike on Windows or Linux both
Thunderbird and Firefox have all sorts of issues with national
characters: different by 3/4 latin and cyrillic character sizes on the
same page, unreadable fonts, overlapping letters, etc.

It's been many years since localization issues are gone on other
platforms, but not here. Very inconvenient. To the point, I still can't
use Mac for reading mail/news (Thunderbird is kinda mandatory for me) :(

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Anton Solovyev