User-Agent: Mozilla/5.0 (Mobile; rv:42.0) Gecko/42.0 Firefox/42.0 We need this feature for the Facebook app to make it more useful. Another way to do it is to implement Facebook messenger.

Service Worker (available in 2.5 and above) is resolving this issue and will allow for notifications to push to devices. Re Messenger: This is a separate application owned by FB. At this time, Fb has not committed to submitting a version of this application for MP. As a user, you can reach out to FB and suggest adding Firefox OS to their list of supported platforms. To do so, please visit https://www.facebook.com/help/127103474099499 and let them know your thoughts!