how to reinstall safari in 10.9.5
how to reinstall safari on this mac pro computer 10.9.5
Mac Pro
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You have to reinstall the OS to reinstall Safari.
Do a backup, preferable 2 separate ones on 2 drives. Boot to the Recovery Volume (command - R on a restart or hold down the option/alt key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair Disk and Repair Permissions until you get no errors. Then re-install the OS.