Install the .xpi file as any other Firefox extension
I haven’t tried out the simulator, but the idea it’s just a Firefox extension is amazing. Development will be easy no matter what platform you run (OS X, Windows, Linux). However, I’m worried that performance may suffer. The Android simulator is almost useless because it runs so slow.
I decided to give it a try today and it blows the Android simulator out of the water in terms of speed. I’m quite impressed.