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Enabling the Developer / Debug Menu to Safari
With OS X Mountain Lion, Apple has removed certain useful facilities, like the command-key shortcut for clearing the browser cache.
Clearing the browser cache and many other useful features are added to amenu as follows.
Open Terminal (/Applications/Utilities), and enter this command:
defaults write com.apple.Safari IncludeDebugMenu 1
Quit Safari and restart it, and the new Develop menu will appear.