In my last post I tried to estimate when Service Workers would ship in Firefox. I was pretty sure it would not make it in 40, but thought 41 was a possibility. It’s a few months later and things are looking clearer.

Unfortunately, Service Workers will not ship in Firefox 41.

While Service Workers are largely feature complete, we’ve had issues with the network interception code. It’s become clear that implementing this feature has introduced a number of security risks. We need to perform a fresh security audit before the code can ship.

This was a difficult decision to make, but we feel it was the right one given the security implications.

That being said, it’s still possible we will ship parts of the Service Worker spec in Firefox 41:

  • Specifically, push notifications are very close and may make it into the release. If this occurs we will add a preference to disable fetch event while exposing the rest of the Service Worker API. This will allow push-based Service Workers while the network interception goes through its security audit.

  • In addition, it seems likely that the Cache API will ship in Firefox 41. While this feature is not as useful without the fetch event, it’s a large piece needed to support offline web pages. Getting it released moves us that much closer to full offline support and will let us focus more people on polishing network interception.

As always, we appreciate your support and patience. Please don’t hesitate to contact us if you encounter any problems.