It seems Safari 6 has also turned off color management for html/css defined colors. To illustrate this problem I have attached a screen shot.
On the left side you see a div with background-color: rgb(150,195,30) set in css and on the right side you can see another div with background-image: url(…) set to a jpeg image with an identical color fill and embedded sRGB profile. What happens is, that Safari 6 takes the CSS value and applies the monitor profile, but honors the sRGB profile of the background image and converts it to the monitor color space. This behavior is really annoying because CSS defined colors will look differently even on calibrated screens.