Obsolete since Gecko 51 (Firefox 51 / Thunderbird 51 / SeaMonkey 2.48)
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
MozAlarmsManager object you can use to schedule notifications or applications to be started at a specific time.
var alarms = window.navigator.mozAlarms;
navigator.mozAlarms is a
|Web Alarms API||Working Draft||Defines the extention for the
|Feature||Chrome||Firefox (Gecko)||Internet Explorer||Opera||Safari (WebKit)|
|Basic support||No support||No support||No support||No support||No support|
|Feature||Android||Firefox OS||Firefox Mobile (Gecko)||IE Mobile||Opera Mobile||Safari Mobile|
|Basic support||No support||1.0||No support||No support||No support||No support|
 This API is currently available on Firefox OS only for any installed applications. The current specification for this API is not considered stable enough to unprefix the API yet.