Fired when any alarm set by the extension goes off.

Syntax

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.

addListener syntax

Parameters

• listener

  • : The function called when this event occurs. The function is passed this argument:

    • alarm

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

Examples

Handle an alarm going off:

function handleAlarm(alarmInfo) {
  console.log(`on alarm: ${alarmInfo.name}`);
}

browser.alarms.onAlarm.addListener(handleAlarm);

Browser compatibility

This API is based on Chromium’s chrome.alarms API.