User blog comment:Kirkburn/Technical Update: April 27, 2015/@comment-4403232-20150428104421/@comment-4370375-20150429203111

No you are not listening, their tabber looks like this: This is the first tab. This is the second tab is opened by default. Which is the exact same thing I'm using for my tabber. Also, the modifications were to allow certain pages to have default tabs that weren't the first one.