Walking up the call chain, it tries to resolve _DEFAULT_HOST(), which is localhost. Maybe localhost does not resolve to a good name for the chosen protocol? Maybe things work better if you explicitly supply a hostname, or a fixed IP address?

my $ff = Firefox::Marionette->new(
    host => '127.0.0.1',
    #host => 'localhost',
    #host => '::1',
    #host => 'hostname-of-the-machine',
);

[download]

Maybe localhost only resolves for IPv4 (or IPv6) and pack_sockaddr_in tries to pack an address for IPv6 (or IPv4)...

In reply to Re: Undefined address for Socket::pack_sockaddr_in by Corion
in thread Undefined address for Socket::pack_sockaddr_in by WithABeard

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