popup.js

$('body').on('click', '.cadastro', function(){
        chrome.tabs.create({ url: url }, function(tab)
        {
            chrome.tabs.query({active: false, currentWindow: true}, function(tabs) {
                chrome.tabs.executeScript({code:"console.log('"+tab.id+"')"});
                chrome.tabs.sendMessage(
                    tab.id,
                    {"greeting": "hello", 'data': dados}

                );
            });
        });
    });