tabs.onActivated

Fires when the active tab in a window changes. Note that the tab's URL may not be set at the time this event fired, but you can listen to onUpdated events to be notified when a URL is set.

Syntax

browser.tabs.onActivated.addListener(function(
  activeInfo // object
) {...})
browser.tabs.onActivated.removeListener(listener)
browser.tabs.onActivated.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:

activeInfo
object.

Additional objects

activeInfo

tabId
integer. The ID of the tab that has become active.
windowId
integer. The ID of the tab's  window.

Browser compatibility

EdgeFirefoxChromeOpera
Basic support?45.0Yes33
Firefox
Basic supportNo

Examples

Example add-ons

Acknowledgements

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

Document Tags and Contributors

 Contributors to this page: wbamberg
 Last updated by: wbamberg,