Duplicates a tab, given its ID.

This is an asynchronous function that returns a Promise.


var duplicating = browser.tabs.duplicate(
  tabId              // integer


integer. The ID of the tab which is to be duplicated.

Return value

A Promise that will be fulfilled with a tabs.Tab object containing details about the duplicated tab. The Tab object only contains url, title and favIconUrl if the extension has the "tabs" permission. If any error occurs the promise will be rejected with an error message.

Note: Beginning with Firefox 68, the promise returned by browser.tabs.duplicate() resolves as soon as the tab has been duplicated. Previously, the promise only resolved once the tab had fully been loaded.


Duplicate the first tab, and then log the ID of the newly created tab:

function onDuplicated(tabInfo) {

function onError(error) {
  console.log(`Error: ${error}`);

// Duplicate the first tab in the array
function duplicateFirstTab(tabs) {
  if (tabs.length > 0) {
    var duplicating = browser.tabs.duplicate(tabs[0].id);
    duplicating.then(onDuplicated, onError);

// Query for all open tabs
var querying = browser.tabs.query({});
querying.then(duplicateFirstTab, onError);

Example extensions

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxOperaFirefox for Android
duplicateChrome Full support YesEdge Full support 79Firefox Full support 47Opera Full support YesFirefox Android No support No


Full support  
Full support
No support  
No support

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

Microsoft Edge compatibility data is supplied by Microsoft Corporation and is included here under the Creative Commons Attribution 3.0 United States License.