It doesn't help matters when you're trying to render that inefficient code on extremely low-end hardware, like the sub-1GHz single-core chip inside the ZTE Open.

ENGADGET: Firefox OS is repeating the mistakes of others and hoping for a different outcome

While some of the deployed protocols are in the public domain, the source code for particular applications have not been released yet making it difficult for security researchers to render an informed opinion on its implementation.

FORBES: Pressure Increases On Silent Circle To Release Application Source Code