Firefox Font?

Recently i changed from UBUNTU to Debain (woo what a big change you may be thinking). So anyway ive got most things setup as i want them, apart from that annoying bootsplash which seems to dislike me. But anyway i seem to have hit a wall with a problem with firefox.

As im typing this message now the font is ridiculously small and is grey and appears fuzzy to me, yet the TITLE input on the post thread is perfect. This only seems to happen on some sites and it never happened in ubuntu, considering im using the same setup practically since i assume firefox config is stored in a user home directory. (To cut a long story short im using the same /home as when i was on ubuntu due to it being on its own partition, in ubuntu fonts appeared correctly but not in debian)

Has anyone else come across this? I mean ive got a Debian woody machine that ive been running for just over a year now and its never had this problem with firefox or anything....