How to enable TLS 1.3 in Mac Safari

1. Open the Mac Terminal accessing to the Spotlight icon.

2. Start typing "terminal" in the search box.

3. Once it find the app, double click in the Terminal icon to open the terminal window.

4. Type "sudo su - root" to become a root user.
5. Type "defaults write /Library/Preferences/ tcp_connect_enable_tls13 1" command and press Enter.
6. Restart Safari.

Note: If you are using Safari version 7 or greater, TLS 1.1 and TLS 1.2 are automatically enabled.

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