if tab selected and another tab selected, produce results code example

Example: if tab selected and another tab selected, produce results

if(output == 'found') {
    sendResponse({findresult: "yes"});

    chrome.extension.onRequest.addListener(function(request, sender, sendResponse) {
        //chrome.tabs.update(sender.tab.id, {selected: true});
        //chrome.tabs.update(sender.tab.id, {active: true});
        alert(sender.tab.id);
    });
}