I saw a document about DOMApplicationsRegistry.install() – Web APIs | MDN.and try to create WordPress Shortcode Plugin.

Downloads

You can download on WordPress Plugin Directory.

WordPress › firefoxOS APP Downloader « WordPress Plugins

Source Code is Here

firefoxos-app-downloader

Usage

write “ffapp-dl” shortcode like that.
[html]
[ffapp-dl class="BUTTON CLASS" btnText="Download" dlLink="https://example.com/manifest.webapp"]
[/html]

This shortcode changes following HTML.
[html]
<div id=’ffapp-dl-btn’ class=’BUTTON CLASS’ data-ffapp-dllink=’https://example.com/manifest.webapp’>Download</div>
[/html]
And working some Javascript.

If you click this button on firefoxOS browser, you can download firefoxOS App.