This is missing the point of Firefox OS. It's not meant to go head-to-head with other mobile OSes, it's a development platform for new phone-oriented HTML APIs. When Firefox OS started, there was no way for a web page to use a phone's webcam, or to act as the phone's dialer. The existence of Firefox OS means that other mobile OSes can use their standardized and tested APIs to make HTML more powerful.
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This is missing the point of Firefox OS. It's not meant to go head-to-head with other mobile OSes, it's a development platform for new phone-oriented HTML APIs. When Firefox OS started, there was no way for a web page to use a phone's webcam, or to act as the phone's dialer. The existence of Firefox OS means that other mobile OSes can use their standardized and tested APIs to make HTML more powerful.