[ Solution ] If you are facing issue like "Service worker failed to register"

[LEAGUEDORA]

Try changing

importScripts("https://www.gstatic.com/firebasejs/9.0.0/firebase-appjs');

to

importScripts('https://www.gstatic.com/firebasejs/9.0.0/firebase-app-compat.js');

[google-oss-bot]

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