Your question has nothing to do with the problem talked about here. This thread is about getting a timeout. As far as I am aware you are struggling with using the right version of Perl and getting WWW::Mechanize::Firefox installed at all, not with getting a timeout in some specific situation.

Net::Telnet is needed by MozRepl which is needed by MozRepl::RemoteObject which is needed by WWW::Mechanize::Firefox.

I recommend you attend a course on Perl and on Perl modules. Please stop trying nonsensical things and try to learn the concepts of Perl and Perl modules before trying to proceed further with WWW::Mechanize::Firefox.