Comment 113 for bug 379761

I am using Firefox 3.6.10 in Ubuntu Maverick 10.10 Beta. I was able to solve[1] this problem by adjusting the files in /etc/fonts/conf.d/ to reflect my GNOME font settings (in my case, I use full hinting):

cd /etc/fonts/conf.d/
sudo rm 10-hinting-slight.conf
sudo ln -s ../conf.avail/10-hinting-full.conf
sudo dpkg-reconfigure fontconfig

[1] http://www.ubuntu-inside.me/2009/07/howto-fix-firefox-35s-font-hinting.html