It returns a list of WWW::Mechanize::Link objects, just like the documentation says.

See the documentation for WWW::Mechanize::Link for the complete API, but here's an example of what you can do:

use warnings;
use strict;
use WWW::Mechanize;

my $w = WWW::Mechanize->new();
$w->get('http://perlmonks.org/');

foreach ($w->find_all_links) {
    print $_->url,"\n";
}
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