As for PWA Manifests on Android, we would love to, but Google has restricted the ability to do this to Chrome only.
The Context Graph work is done in parallel with the Quantum and E10S work that is focused on making…
Nick Nguyen

How so? Firefox already has an “Add to Home Screen” option that can launch a Firefox tab. What makes it impossible for it to ask, at shortcut activation time, “is the page being opened in the list of pages I’ve seen with a PWA Manifest?”, then respond with opening a new Activity with a Gecko WebView embedded inside?

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