RobinInTheRain

Despite the parent comment getting downmodded, I think it makes a valid point.

Why don't we see a true plurality of programming languages supported within the browser?

I'm talking about proper implementations, too. Not hacks that use something like Emscripten to mangle C code down to JavaScript (which is all that asm.js is, after all).

NaCl and PNaCl are a much more general and sensible approach, rather than trying to contort JavaScript into a psuedo-bytecode.

If Mozilla really does care about openness and freedom, then we'd see more emphasis being placed on languages other than JavaScript. But CmonDev is right, we just don't see that happening. We see a monoculture developing around JavaScript and only JavaScript. In general, monocultures of any type are an unhealthy thing, and lead to stagnation.

An objective look at Firefox's metrics show that it went from around 35% of the browser market a few years ago to under 10% today, and this number is still dropping. In addition, Firefox has almost no usage on mobile systems.

Those metrics tell us everything we need to know about Mozilla's efforts these past few years: people in general are not happy with them, to the post of abandoning Firefox.