We're planning an export-to-Mozilla-store option, but I think currently you can only submit games without seeing them published. So let me know if I don't see myself when they open the actual store, and I'll be sure to get on that right away :)
I'll look for you when the store opens. Right now you can sell but no one can buy. It looks like the store will be open for business in late April and will be finalized in June. I don't know when the Windows 8 store will be open -- the latest rumors are that Win 8 will ship in October. These are exciting times for HTML5 apps!