Set Default Fonts in Safari 6

With the release of Safari 6, the default font settings preferences have been removed. If you still want to set default fonts without using a custom style sheet you can still use Terminal commands to set them. Another workaround is to use the Quickstyle Safari Extension.

Below are some example commands for Terminal:

Proportional Font:

defaults write com.apple.Safari com.apple.Safari.ContentPageGroupIdentifier.WebKit2StandardFontFamily 'Lucida Grande'
defaults write com.apple.Safari com.apple.Safari.ContentPageGroupIdentifier.WebKit2DefaultFontSize 16

Fixed Width Font:

defaults write com.apple.Safari com.apple.Safari.ContentPageGroupIdentifier.WebKit2FixedFontFamily Monaco
defaults write com.apple.Safari com.apple.Safari.ContentPageGroupIdentifier.WebKit2DefaultFixedFontSize 12