They pour a ton of money into events like SXSW. They had huge displays of their new branding up and down Congress Ave a couple of years ago, with several other "brand awareness" things going on throughout the conference.
Actually, given the current demographics of SXSW, that probably IS good marketing to potential customers. SXSW now costs quite a bit and is often a hipster corporate management perk. That sounds like a good demographic for Mozilla to market to.
Lone gone are the days where SXSW was a bunch of grubby hippies listening to a bunch of crappy bands. Now it's a bunch of hipster drones listening to a bunch of crappy mainstream pop artists.