add firefox extension template

externs/webextension_polyfill/alarms/Static.hx

@@ -0,0 +1,33 @@
+package webextension_polyfill.alarms;
+
+typedef Static = {
+	/**
+		Creates an alarm. After the delay is expired, the onAlarm event is fired. If there is another alarm with the same name
+		(or no name if none is specified), it will be cancelled and replaced by this alarm.
+		
+		Creates an alarm. After the delay is expired, the onAlarm event is fired. If there is another alarm with the same name
+		(or no name if none is specified), it will be cancelled and replaced by this alarm.
+	**/
+	@:overload(function(alarmInfo:CreateAlarmInfoType):Void { })
+	function create(name:Null<String>, alarmInfo:CreateAlarmInfoType):Void;
+	/**
+		Retrieves details about the specified alarm.
+	**/
+	function get(?name:String):js.lib.Promise<Null<Alarm>>;
+	/**
+		Gets an array of all the alarms.
+	**/
+	function getAll():js.lib.Promise<Array<Alarm>>;
+	/**
+		Clears the alarm with the given name.
+	**/
+	function clear(?name:String):js.lib.Promise<Bool>;
+	/**
+		Clears all alarms.
+	**/
+	function clearAll():js.lib.Promise<Bool>;
+	/**
+		Fired when an alarm has expired. Useful for transient background pages.
+	**/
+	var onAlarm : webextension_polyfill.events.Event<(name:Alarm) -> Void>;
+};