Unmaintained [SchmitzIT] How to add forum icons in tabs added with listeners

In our old vB forum we used to have icons on our navigation tabs. We wanted to have the same thing in xF, and implementing this in the default tabs was easy, but the dynamically added tabs posed a wee bit more of a challenge.
Luckily, it is still fairly easy to accomplish, thoug, and here is how.

First off, find the template navigation. In it...