While Android 2.0 is a min requirement, the cpu the phone or tablet or such is what makes the (huge) difference. Sorry but this phone is not compatible with the current mobile Firefox releases due to the ARMv6 (ARM11) CPU it uses when release work on ARMv7 cpu's. If it is not in Market then it likely means the hardware is not compatible. You can perhaps try the experimental ARMv6 nightlies (Fennec). https://wiki.mozilla.org/Mobile/Platforms/Android#ARMv6_.28experimental.29