<disclaimer>I work for mozilla on fxos</disclaimer> And that works really well considering the price point and the hardware. Another benefit of working to make things good on this very low end device is that we made a number of performance improvements that benefit also other devices.

Something important to note compared to android is that android phones in this range are stuck with gingerbread and no official play store.

I don't think it's a good idea. Even with 256 MB FFOS is sluggish...

Replace all structs with unions and hope nobody ever uses the other parts of the data structure!