If Firefox users needed (or wanted) marketplace for (web) apps (or any other Chrome feature) they'd already be using Chrome ...
If Firefox users needed (or wanted) marketplace for (web) apps (or any other Chrome feature) they'd already be using Chrome ...
This way we'll be begging jQuery for Web Apps or some other abstraction layer that will do all the dirty work of cross browser compatibility...
I don't see a standard for Web Apps on http://www1.webplatform.org/ anywhere ...
Generally speaking, though, the difference between one definition of "web app" and another is very small, in terms of what the platform has to support.
I'll also note the perspective that sometimes it takes a couple of implementations before the "right" solution is known. Many evolutions of the web standards have followed varying implementations being played with in the field.