IMHO relying solely on the web platform (HTML5, etc) for your OS is a mistake. I don't see Firefox OS succeed in more than niche markets - it's just purely worse than stock android in every respect.

Yes, I agree with you. It is even more difficult to develop applications in these langages. However, these operating systems are still in beta version and will probably get updates...

It seems that "pure web platform" is a foundational goal for Firefox OS; it's hard to see that changing in an update, but yeah, who knows.

They are targeting lower cost devices selling in developing countries. I'm not sure how they think using slower software on slower hardware is good idea.

I'm using a Geeksphone Peak right now, and it's VERY fast and responsive, especially with newer software. Same with the Keon, which contains a lot of the "target-level" hardware. As long as apps are made specifically for Gecko, it should be fine.

The Peak is a monster in terms of performance GPU and CPU. I wanted to buy it, it is very cheap. However, it is out of stock on the official website ;( Do you have any other way to get one?

What is their business strategy?

Ah, I have dug a bit deeper.

HTML 5 is probably the most accessible development language. XCode and Eclipse both require a fairly hefty (and expensive) development machine to be usable. Whereas HTML 5 can be developed on any machine with a text editor and a browser. Hell, you can even code quite happily directly on the device if necessary.

Mozilla are targeting the developers of less wealthy nations with their choice of platform. Makes sense.