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fix: Use local port to avoid triggering the firewall (#1833)

When `web-ext run` starts, the following prompt shows briefly on macOS:

> Do you want the application "node" to
> accept incoming network connections?

This is because we use `listen(0)` to find a port, and by default, this
method listens on any network interface.

Since we are only looking for free ports and not network connections,
limit `listen()` to localhost only.

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