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tabs.onCreated

files/en-us/mozilla/add-ons/webextensions/api/tabs/oncreated/index.md

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Fired when a tab is created.

Note that the tab's URL may not be given its final value at the time this event fired. In particular, Firefox opens a new tab with the URL "about:blank" before loading the new page into it. You can listen to {{WebExtAPIRef("tabs.onUpdated")}} events to be notified when a URL is set.

Syntax

js-nolint
browser.tabs.onCreated.addListener(listener)
browser.tabs.onCreated.removeListener(listener)
browser.tabs.onCreated.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:
      • tab
        • : {{WebExtAPIRef('tabs.Tab')}}. Details of the tab that was created.

Examples

Log the IDs of newly created tabs:

js
function handleCreated(tab) {
  console.log(tab.id);
}

browser.tabs.onCreated.addListener(handleCreated);

{{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.

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