This is weird and I don't know where that timeout comes from. Maybe it really is Firefox timing out as it is busy synchronously fetching some result. As you see in the trace, WWW::Mechanize::Firefox polls every second (or so) to see whether Firefox has fetched a page.
If it really is Net::Telnet, then you'll have to dive down:
$mech->repl->repl->client->{telnet}->timeout($new_timeout);
In reply to Re^3: WWW::Mechanize::Firefox and Net::Telnet timeout
by Corion
in thread WWW::Mechanize::Firefox and Net::Telnet timeout
by OlegG
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