Safari 4: How to Move the Tabs Back to the Tab Bar
Contributed by shamanstears 
March 4, 2009 
Tagged: Apple Mac
If you don’t like that Safari 4 has the tabs located at the very top of the browser window, you can move them back to the Tab Bar like they were in Safari 3.
1. Open Terminal.
2. Execute the following command:
defaults write com.apple.Safari DebugSafari4TabBarIsOnTop -bool NO
Restart Safari. If you don’t see the Tab Bar, go to the Menu, click on View and select Show Tab Bar.
Your tabs go from this:
to this:
To return the tabs back to their original position, open Terminal and execute the following command:
defaults write com.apple.Safari DebugSafari4TabBarIsOnTop -bool YES