Thank you all for your suggestions. I find that provided that I change the port of MozRepl of one of the FireFox windows and assign the new port to the instance of WWW::Mechanize::Firefox, my script can control the Firefox window. $mech = WWW::Mechanize::Firefox -> new ( launch => 'firefox', repl => "localhost:$instance_port" )

In reply to Re^4: Automation of Multiple Windows of Firefox using WWW::Mechanize::Firefox by lalvin
in thread Automation of Multiple Windows of Firefox using WWW::Mechanize::Firefox by lalvin

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