index.md

---

title: tabs.onRemoved
slug: Mozilla/Add-ons/WebExtensions/API/tabs/onRemoved
page-type: webextension-api-event
tags:
  - API
  - Add-ons
  - Event
  - Extensions
  - Non-standard
  - Reference
  - WebExtensions
  - onRemoved
  - tabs
browser-compat: webextensions.api.tabs.onRemoved

---

{{AddonSidebar()}}

Fired when a tab is closed.

Syntax

browser.tabs.onRemoved.addListener(callback)
browser.tabs.onRemoved.removeListener(listener)
browser.tabs.onRemoved.hasListener(listener)

Events have three functions:

• addListener(callback)

  • : 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

• callback

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

    • tabId

      • : integer. ID of the tab that closed.

    • removeInfo

      • : object. The tab's window ID, and a boolean indicating whether the window is also being closed. See the removeInfo section for more details.

Additional objects

removeInfo

• windowId

  • : integer. The window whose tab is closed.

• isWindowClosing

  • : boolean. true if the tab is being closed because its window is being closed.

Examples

Listen for close events, and log the info:

function handleRemoved(tabId, removeInfo) {
  console.log(`Tab: ${tabId} is closing`);
  console.log(`Window ID: ${removeInfo.windowId}`);
  console.log(`Window is closing: ${removeInfo.isWindowClosing}`);
}

browser.tabs.onRemoved.addListener(handleRemoved);

{{WebExtExamples}}

Browser compatibility

{{Compat}}

Note: This API is based on Chromium's chrome.tabs API. This documentation is derived from tabs.json in the Chromium code.