by John Ford
Instructions
In an open Finder window, navigate to "Applications/Utilities" and double-click on the "Terminal" application to launch it.
In a new Terminal window, enter the following command to write the rules to Safari to enable "Single User Mode," then hit the return/enter key on your keyboard to complete the command:
defaults write com.apple.Safari TargetedClicksCreateTabs -bool true
To return Safari to its normal settings, enter the following command and hit return/enter on your keyboard:
defaults write com.apple.Safari TargetedClicksCreateTabs -bool false
How to Enable Safari Single Window Mode on Mac OS X | Provided by eHow.com
