alarms.onAlarm

Fired when any alarm set by the extension goes off.

browser.alarms.onAlarm.addListener(listener)
browser.alarms.onAlarm.removeListener(listener)
browser.alarms.onAlarm.hasListener(listener)

Events have three functions:

addListener(listener)

Adds a listener to this event.

removeListener(listener)

Stop listening to this event. The listener argument is the listener to remove.

hasListener(listener)

Check whether listener is registered for this event. Returns true if it is listening, false otherwise.

listener

Function that will be called when this event occurs. The function will be passed the following arguments:

alarm

alarms.Alarm. The alarm that fired. Use Alarm.name to figure out which alarm fired.

Handle an alarm going off:

function handleAlarm(alarmInfo) {
  console.log("on alarm: " + alarmInfo.name);
}

browser.alarms.onAlarm.addListener(handleAlarm);

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