The relationship between Google and Amazon has just taken a sour turn, but they have never really been best buds from the beginning. While Amazon's Fire tablets and TV devices do run Android, they use a heavily customized, not Google-certified, version that doesn't keep up with the latest Android updates. At least until now. Despite making a big splash about new hardware products, Amazon was nearly totally silent about the release of Fire OS 6. And there reason might be to prevent user backlash about this latest update not being available to any existing Fire device in the market.