If you're working with Chrome, add the WndClass name to MSAA, in your project settings,
TC will then expose the following details,
You can then access the tabs via the following code,
function Test10()
{
NameMapping.Sys.Browser().Form("Google - Google Chrome").Pane("Google Chrome").Pane(0).Pane(1).Pane(0).TabList(0).Pane(0).Pane(0).PageTab("Google").Click();
aqUtils.Delay(1000);
NameMapping.Sys.Browser().Form("Google - Google Chrome").Pane("Google Chrome").Pane(0).Pane(1).Pane(0).TabList(0).Pane(0).Pane(0).PageTab("Google", 2).Click();
aqUtils.Delay(1000);
NameMapping.Sys.Browser().Form("Google - Google Chrome").Pane("Google Chrome").Pane(0).Pane(1).Pane(0).TabList(0).Pane(0).Pane(0).PageTab("Google", 3).Click();
aqUtils.Delay(1000);
}