Google can be out-competed, look at their attempts at social networks & messaging/calling.
Google has lit dumpsters full of cash on fire in an effort to get anywhere near Facebook, Twitter, Whatsapp, Viber or even Signal Private Messenger, and yet their extremely fractured strategy that they have dumped R&D into still has less users than any of those in their respective categories.
Mozilla can be competitive, akin to Darktable vs Adobe if Mozilla chooses to be. No more mucking about bailing their friends out (ie: Pocket acquisition), or trying to fight Google on hardware prices (Firefox OS's entire strategy). Mozilla can create a playing field tilted in their favor, and force others to compete on their turf rather than duking it out on Google or Chinese OEMs turf.