Heh, that's funny. Webkit (it happens in Safari and Shiira) must parse the image with color correction or something funny. Yeah, it shows up right on Mur's post in my version of Camino, too.
Webkit (with 10.3.9 and whatever ColorSync profile I have) has its color as #cdd0da... almost smack dab in between the two backgrounds. So much for my slam.