Font parameters in CSS is not active in Firefox, if the text is in Japanese.

The header of a node is displayed with a san-serif font in Firefox if the text is in Japanese.

To fix this, you need to have the following in the main.css file:

- Change the font parameter for h1, h2, h3, h4 tags to font: bold 1em/1.5em Georgia, 'Times New Roman', Times, 'Hiragino Mincho Pro', 'ヒラギノ明朝 Pro', serif;. It can be found on the line 30.
- Change the font parameter for h2 tag inside the id "main" to font: normal 2.6em Georgia, 'Times New Roman', Times, 'Hiragino Mincho Pro', 'ヒラギノ明朝 Pro', Serif;. It can be found on the line 408.
- Add @charset 'UTF-8'; to the top of the CSS.

Note that the line numbers above are taken from http://drupalcode.org/viewvc/drupal/contributions/themes/ninesixtyrobots...