@Sam yes Foundation is using an old version of the framework
@Ciencia Yes you're right, tabs rely on some existing components from Foundation and it is broken after the update. It is why I thought it was a skin issue, as it is a utility provided by Foundation before.
We can probably switch to header tab as an interim option if we are keeping Foundation at the meantime. Chameleon does have native tab support through Bootstrap, but it won't work on non-Bootstrap skin such as Foundation.