Apple’s iOS and Google’s Android platforms have a stranglehold on the global smartphone market that doesn’t appear to be slipping anytime soon. But as a bloody battle rages for the No.3 and No.4 positions in the smartphone race, a new contender with a very different strategy has now hit the market: Firefox OS. Beginning immediately, the first two Firefox-powered smartphones are available to developers and the general public. Or, they were available — it’s hard to say if consumers at large have had their interest piqued by Firefox OS, but both the Keon ($119) and Peak ($194) were sold out on Tuesday morning shortly after becoming available so developers are certainly intrigued. We don’t know how many units were stocked with this first round of shipments, but Mozilla’s new open source mobile OS seems to be off to a good start.