moz would have to foot the 6mi.
cisco pays 6mi, and them mpegla returns 3mi to them for their patents in the pool. and if the format becomes ubiquitous, they get any few billions from this same pool from their competitors when they also license it.
they are still the bad guy in this.
People proposed this idea repeatedly to Mozilla back in the day but they rejected it. Maybe they feel their hands are somehow cleaner if Cisco is paying instead of them.