Disabling the Mac OS X alert displayed for newly downloaded applications are launched for the first time

If you want to permanently disable the Mac OS X alert displayed for newly downloaded applications, when  launched for the first time, then execute below command in terminal.

defaults write com.apple.LaunchServices LSQuarantine -bool NO


Then, Force Quit your Finder App or Restart your mac to apply the changes.


To revert back to original setting, run the same above command with YES flag as below.


defaults write com.apple.LaunchServices LSQuarantine -bool YES


Then, Force Quit your Finder App or Restart your mac to apply the changes.



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