I really feel this piece has been lacking; I am very pleased with being able to nestle a Firefox OS app within a PhoneGap app, boosted by Angular. With the addition of Bootstrap, you really can have it all.
What is important here, though, is that all of these approaches intend to make themselves obsolete, leaving behind the promise of Firefox OS... Rich Internet Applications built on Open Web standards (HTML5, CSS), rather than Mono or Flash. In time, the best features of these frameworks will be built into the mobile browser.
On the server-side, a resource-based Open Data REST API, Secured Mobile approach should allow us to build mobile applications that mash up resources across jurisdictions, securely and meaningfully.
Mobile Web and Mobile Exchange. This will be exciting.