I'll try to elaborate a bit more on https://twitter.com/matti_sg/status/522103990373588992 and explain why the Humble Mozilla Bundle is such a noticeable event.
Let's recap what's happening: a non-profit (Mozilla) partners with an indie promotion platform (HumbleBundle) to promote its free open-source tech (asm.js and Firefox). It uses all its communication power for this (social accounts but, more importantly, the Firefox start page that morphs into a game itself). Private, independent actors (the game creators and HumbleBundle) benefit from this, the non-profit does too (portions of the bundle price go back to Mozilla), and most of all the union of such big actors proves the platform can deliver the promise.
Mozilla had done several demos of HTML5 + WebGL + asm.js being a proper platform for