Then why not setting data-persist="false"?
Yes setting it true will write the cookies.
I had the same problem but it's easy to fix.
Just remove "data-persist=true"
The tabs still work fine but it doesn't create a persistent cookie, so on refresh it goes back to first tab.
Please read the Set Persistence section under the "How to Use" tab in http://www.menucool.com/tabbed-content
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