A tracking bug for landing the site specific browser prototype. The goal is to be able to launch a site out into its own window with minimal UI. Attempts to navigate outside of the site will be redirected back to the main browser.
This will land preffed off by default for the time being.
Just so you know, we had a lot of platform-specific code for "installing" apps when we had the webruntime (https://wiki.mozilla.org/Apps/WebRT). You could possibly re-use some of that code.
Is this the installation feature of PWA?
SSB need support webextension.