It definitely wasn't like this before I restarted my computer.
EDIT: I think it was because Chrome updated - the font has changed on other sites too. Can any other Chrome users confirm? I am using Chrome Version 37.0.2062.94 m and am pretty sure it was 36.x before.
EDIT: Chrome updated again to Version 37.0.2062.102 m, still this strange looking font. Code sections look really really strange to me on this site now.