Welcome

 
https://www.google.ro/search?q=firebase+push+not+working+in+chrome
https://github.com/firebase/quickstart-js/issues/216
https://www.google.ro/search?q=usePublicVapidKey
https://stackoverflow.com/questions/49833687/firebase-cloud-messagings-gettoken-only-works-if-i-omit-the-usepublicvapidkey
https://github.com/firebase/firebase-js-sdk/issues/628
https://github.com/firebase/quickstart-js/issues/203
https://stackoverflow.com/questions/52817689/firebase-cloud-messagings-gettoken-pending-in-chrome-extension
https://stackoverflow.com/questions/51401742/cant-get-firebase-cloud-messaging-to-work-in-my-web-app
chrome://serviceworker-internals/