Though I am concerned about it's performance. Firefox has always been prone to crashing. Thus I wonder is this a brand new piece of software not built on the Mozilla (Firefox) engine?
I'm my experience, most crashes seem to be related to plugins and/or extensions, with that aside, I seem to get pretty comparable crash frequency from Firefox and chrome while developing code that relies on pretty state-of-the-art APIs (WebGL)
We haven't been able to get our app working in regular Firefox because of this - unfortunately!
Firefox for Android for some devices also supports MP3 and H.264 now.
Desktop support is in progress with Windows and Linux being the furthest along.