MacFixIt
Uninstall process The following process should work for reverting to Safari v74 if you installed the unauthorized v80 release:
Login as the root user
Trash Safari and the WebKit.framework (use the Find function to locate it)
Copy the Foundation.framework (again, use the Find function) from another Mac.
Re-apply the Mac OS X 10.2.6 combo update.
Reboot, reset your preferences and reinstall Safari 74
Uninstall process The following process should work for reverting to Safari v74 if you installed the unauthorized v80 release:
Login as the root user
Trash Safari and the WebKit.framework (use the Find function to locate it)
Copy the Foundation.framework (again, use the Find function) from another Mac.
Re-apply the Mac OS X 10.2.6 combo update.
Reboot, reset your preferences and reinstall Safari 74