Does anyone know if the Firefox phones are still around / in use in India? I actually had a friend import the Intex Firefox phone (don't remember the name, it's got 128mb of RAM and a dead-end FXOS version). It's utterly painful to use - I hope the situation has gotten better for users there.
But, the perhaps bigger issue with Indian phones is the locking down of firmware. Spreadtrum (the SoC in the phone that you're mentioning) has all sources (device + kernel + vendor trees included) for compiling FFOS for the "tarako" board (upon which 3 of the first $35 FFOS smartphones sold in India were based).
However, I'm not sure up to what extent you can modify their firmware. Github user abgoyal (forgot his HN username) had a fair amount of success acquiring the kernel sources for his $35 FFOS device from the vendor ( https://github.com/abgoyal/zen_u105_kernel ), but iirc he had issues with those sources too.
Now, if I want to buy that particular device (since its open) to have a cheap $35 _thing_ to break, unfortunately I can't, since they stopped production.