How so? Firefox already has an “Add to Home Screen” option that can launch a Firefox tab.
Filip Wieland

We could do the very basic PWA implementation, but Google has restricted features like app drawer integration and intent handling to Chrome only. We’ll look into supporting this when Google makes these features available to other browsers, but currently non Chrome browsers are decidedly second class with regards to PWA, so we’re investing time in privacy and webextensions on Fennec, among other things.

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