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@MarcosC For Android, I suggest you run tomayac.github.io/pwa-feature-detector/ and fill the ‘❌’. For your Firefox for iOS users, I suggest you encourage (by commenting) Apple to work on the bugs listed at the end of medium.com/dev-channel/progressive-web-app-progress-in-ios-12-2-beta-1-build-16e5181f-a18cd05ca361 (and let WKWebView use service workers at all).