Though, to be clear, it should be easy to write a single app that works as both a Chrome app and a B2G/Firefox app, as long as you use APIs that work across bot

Though, to be clear, it should be easy to write a single app that works as both a Chrome app and a B2G/Firefox app, as long as you use APIs that work across both environments. (Chrome apps can access non-web-accessible APIs, but they don't have to.)