Comment 5 for bug 588311

The font rendering in firefox 3.6 is just plain awful.

Interestingly ...

Chromium suffered from the same problem, but the .fonts.conf appears to have fixed this issue. The strange thing is, under chromium, where the hinting wasn't being adhered to within the viewport for web pages, the application menus and dialogs honoured the Appearance settings correctly (prior to the .fonts.config hack).

Where as in FF 3.6 the application menus / dialogs were displayed in the same "poor" manner as the rest of the web pages.

I think for the time being I will "lock" FF 3.0 until I'm ready to upgrade to Lucid.