Hi Mittineague,
Yes, you are right. Chrome released partial support for Desktop and Android in version 42. And Firefox will launch support for it from version 44. However, the upcoming versions of all these browsers will hopefully have full support.
We too are excited to see how push notifications develop. It is an exciting new technology and chrome is behind it. Read this excerpt from a recent article on the Chromium blog: “Chrome 42 introduced the ability for users to receive push notifications from websites, allowing users to build deeper relationships with the sites they love. Usage of the feature has grown quickly, with Chrome now delivering more than 350 million push notifications every day. In the latest Chrome release, sites can now add custom buttons to notifications, enabling users to complete tasks entirely within the notification.”