index.md

---

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

---

{{AddonSidebar()}}

Fired when a tab is moved within a window.

Only one move event is fired, representing the tab the user directly moved. Move events are not fired for the other tabs that must move in response. This event is not fired when a tab is moved between windows. For that, see {{WebExtAPIRef('tabs.onDetached')}}.

Syntax

browser.tabs.onMoved.addListener(listener)
browser.tabs.onMoved.removeListener(listener)
browser.tabs.onMoved.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 the user moved.

    • moveInfo

      • : object. Information about the move. See the moveInfo section for more details.

Additional objects

moveInfo

• windowId

  • : integer. ID of this tab's window.

• fromIndex

  • : integer. Initial index of this tab in the window.

• toIndex

  • : integer. Final index of this tab in the window.

Examples

Listen for and log move events:

function handleMoved(tabId, moveInfo) {
  console.log(`Tab ${tabId} moved from ${moveInfo.fromIndex} to ${moveInfo.toIndex}`);
}

browser.tabs.onMoved.addListener(handleMoved);

{{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.