Specifications of the Firefox OS Developer Preview Devices

Adreno 200 (what the S1 is using) is probably the worst GPU of the entire 5 years of modern touchscreen smartphones' existence. You really don't want many more pixels than that. Virtually no 3D games work on it, and even some more "graphics intensive" 2D games can be too much for it with a 480x320 resolution. I remember Angry Birds working pretty poorly on it initially, but they fixed it later.

> One exception: not enough pixels on screen to stress the graphics hardware

I'm more worried about DPI/PPI scalability. In theory web-based content should scale rather well, but reality is always more complicated than that.

It would be interesting to hear longer review. Still I believe you experience is better than OpenMoko FreeRunner (I have not owned it but my coworkers and other people I know bought these and never used again). This experience alone discouraged people from trying anything else.

It would be interesting to see if one of those Open devices or OS succeeded but it needs more than "open" for that.

These are just the developer devices. The first Firefox OS devices sold to end-users in Brazil will be manufactured by ZTE and/or Alcatel. (Note: I am a Mozilla employee, but I don't know anything about the Telefonica devices beyond what's been publicly announced.)

https://blog.mozilla.org/blog/2012/07/02/firefox-mobile-os/

Those are the specs of a high-end phone in 2012, though. And it's still a bit far from the $50 low-end Android phones being sold in Africa right now, but it's also lower than what would be mid-end today, so somewhere between low-end and mid-end.