I think that if I can use TinyMCE editor in the categories description it was amazing! :-)
Brad Griffin commented
Tino, great news: That's already possible!
The Storefront theme itself really shouldn't "do" a function that enhances or detracts. The theme should only handle the "displaying-of-information".
So, if you'll fire up the Visual Term Description Editor, and use that, you'll quickly see the TinyMCE editor appear enabling and empowering you to add h1 tags (and much more) to Storefront (and any other theme) category description.