An experiment that doesn’t meet a need for Android
As of this writing, the Firefox Marketplace has less than 300 apps -- the majority are games -- but, frankly, we’re hard-pressed to recommend any now as a must-install on your Android device. (Mozilla is openly accepting app submissions for Firefox Marketplace.) Many of them come off as technically simplistic and experimental. There are many more, and better apps you can get from Google Play. An example: Firefox Marketplace has an official Firefox app version of Twitter, but the official Twitter app for Android runs faster and is more feature-rich.