This is a huge problem for the overall strength of the open web and Mozilla unfortunately is no less guilty of this. Many of the tools developed for FxOS are targeted for Gecko and wont run on other rendering engines. More and more it seems the only people actually building libs for the open web are independent developers and small shops. :(
I think there's a difference between ChromeBook or FxOS apps, which may need functionality and more importantly permissions that are not available on the web yet and creating web apps that use functionality that's supported in multiple browsers but restricting to only one browser.
That said, I agree that more FxOS bits need to end up on standards tracks. The permissions issue really needs solving to make serious progress there.
