Open the Terminal and type:
[robg adds: Two new hidden feature hacks in one hint! I couldn't get the DVD Inspector window to appear, but the Performance Monitor definitely works. To disable either feature, just change true to false in the above commands.]
defaults write com.apple.AddressBook ABShowDebugMenu -bool trueThis will show a new Debug menu in the Address Book application with some options for enabling and printing logs. Also type:
defaults write com.apple.DVDPlayer EnableDebugging -bool trueTo enable some new features in the DVD Player. After executing the command, launch DVD Player and look at the Window menu. There are now new options for showing the Inspector and the Performance Monitor.
[robg adds: Two new hidden feature hacks in one hint! I couldn't get the DVD Inspector window to appear, but the Performance Monitor definitely works. To disable either feature, just change true to false in the above commands.]
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