Re: [manifest] Allow developers to detect when the user has added the site to their home screen (or equivalent) (#417)

@marcoscaceres could you explain more about Firefox's problem with onbeforeinstallprompt?

I can imagine if you're automatically installing apps into your new tab page you wouldn't need this event, is there more to it than that?

FWIW in Chrome web apps don't know how they have been launched / started, and our suggestion is to use a similar parameter in the start_url, but that seems like a different problem to what onbeforeinstallprompt was designed for.

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