Gets the window that was most recently focused — typically the window 'on top'.

This is an asynchronous function that returns a Promise.


let gettingWindow =
  getInfo               // optional object


getInfo Optional


populate Optional

boolean. If true, the windows.Window object will have a tabs property that contains a list of tabs.Tab objects representing the tabs in the window. The Tab objects only contain the url, title and favIconUrl properties if the extension's manifest file includes the "tabs" permission or host permissions matching the tab's URL.

windowTypes Optional

An array of windows.WindowType objects. If set, the windows.Window returned will be filtered based on its type. If unset the default filter is set to ['normal', 'panel', 'popup'], with 'panel' window types limited to the extension's own windows.

Note: If supplied, the windowTypes component of getInfo is ignored. The use of windowTypes has been deprecated as of Firefox 62.

Return value

A Promise that will be fulfilled with a windows.Window object containing the details of the last focused window. If any error occurs, the promise will be rejected with an error message.

Browser compatibility

BCD tables only load in the browser


Get the last focused window, and log the tabs it contains. Note that you'll need the "tabs" permission or matching host permissions to access tab URLs.

function logTabs(windowInfo) {
  for (const tabInfo of windowInfo.tabs) {

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

browser.browserAction.onClicked.addListener((tab) => {{ populate: true }).then(logTabs, onError);

Note: This API is based on Chromium's API. This documentation is derived from windows.json in the Chromium code.