background.js

ConnectMessenger.bind('create_context_menu', function(event, data, port) {
    chrome.contextMenus.removeAll();
    if(data.type == 'default'){
        chrome.contextMenus.create({
            'title':'default menu',
            'contexts':["page", "frame", "editable", "image", "video", "audio"],
            'onclick':function(info, tab) {
                    alert('default');
            }
        });

        chrome.contextMenus.create({
            'title':'select "%s"',
            'contexts':['selection'],
            'onclick': function(info, tab) {
                alert('select');
            }
        })

    } else {
        chrome.contextMenus.create({
            'title':'link menu',
            'contexts':['link'],
            'onclick':function(info, tab) {
                window.open(info.linkUrl);
            }
        });
    }   
});