firefox: messed up fonts in google calendar

[schmolch]

In certain calendar views some of the the fonts are messed up:

http://img189.imageshack.us/i/firefox1w.png
http://img39.imageshack.us/f/firefox2x.png

Google Chrome shows everything perfectly, but i would like to use firefox.
I played areound with the font settings but i cant get rid of it.
Any ideas?

Im using Firefox4 + Gnome on Maverick.