From Webdesigner Depot:

Just weeks after the successful launches of the first Firefox OS smartphones to Spain, Colombia, Venezuela and Poland, Mozilla has announced that new launches of Firefox OS smartphones will begin soon with more devices and in more markets around the world.

App designers may already know this is not “yet another platform” to factor for projects. Rather than building apps for Firefox OS — developers are able to build HTML5 apps for the Web. Part of the Firefox OS genius is that it enables developers to access the hardware of the phone by means of Web APIs.
How very 2007 of you, Firefox.
I’m sure this makes developers SUPER excited.