I can't see the standpoint of mozilla either, surely you can't be required to have permission to use a "brand name" just because you mention that you can install some software for a fee? EDIT: I did read mozillas terms, but still think it makes no sense.
If I set up a store selling computers, surely I can, without permission of software manufacturers, allow customers a choice of software and offer to purchase a license & preinstall the software for the customer?