Firefox Web Push Notifications allow you to address the audience of your website. Users will only receive messages from sites for which they have granted permission.
Firefox Web Push Notifications are not allowed for mobile devices yet, but Mozilla is reportedly working on it. Consequently, Firefox will support mobile web pushes in next versions of their browser.
To configure Firefox platform, select the app you want to send pushes to and click Configurefor Firefox.
Input the following in Firefox platform settings:
FCM Sender ID
FCM server API key