Duplicates a tab, given its ID.

This is an asynchronous function that returns a Promise.


var duplicating = browser.tabs.duplicate(
  tabId,              // integer
  duplicateProperties // optional object


integer. The ID of the tab to be duplicated.
duplicateProperties Optional
object. An object describing how the tab is duplicated. It contains the following properties:
index Optional
integer. The position of the new tab in the window. The value is constrained to the range zero to the number of tabs in the window.
active Optional

boolean. Whether the tab becomes the active tab in the window. Does not affect whether the window is focused. Defaults to true.

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
ChromeEdgeFirefoxOperaSafariFirefox for Android
duplicateChrome Full support YesEdge Full support 79Firefox Full support 47Opera Full support YesSafari Full support 14Firefox Android No support No
duplicatePropertiesChrome No support NoEdge No support NoFirefox Full support 77Opera No support NoSafari No support NoFirefox Android No support No
tabIdChrome Full support YesEdge Full support 79Firefox Full support 47Opera Full support YesSafari 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.