Let's see if and how quickly @RedHat can push out @firefox 60.0 ESR to RHEL users. Will be nice to enable and test service workers.

May 9, 2018 ยท 3:38 PM UTC

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According to the release page they as well as push notifications are disabled by default. If I set 'dom.serviceWorkers.enabled' to true for test purposes it should work I believe.