442Transparent Background in Safari 4.0

http://127.0.0.1/transparent/

Enable Debug Menu in Safari 4.0:

defaults write com.apple.Safari IncludeInternalDebugMenu 1

via http://trac.webkit.org/wiki/WebDevelopers

Also, an interesing option is to modify the .nib file of Safari and insert a new menu: http://pointum.com/safari-tweaks.html

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