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Windows and Linux user for 25 years [EDIT Windows for 25, Linux for 20, to be more precise], heavy macOS user (in addition to those) for the last 10 or so.

If it has a firewall of any kind, I've never noticed nor interacted with it. I've also never installed a third party firewall.

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Firewalls can do two things, mainly. Block inbound connections, block outbound connections. The macOS firewall is mainly intended for the former. Many folks want to prevent the latter (e.g. blocking phone home connections).

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