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---
title: sessions
slug: Mozilla/Add-ons/WebExtensions/API/sessions
page-type: webextension-api
browser-compat: webextensions.api.sessions
---
{{AddonSidebar}}
Use the sessions API to list, and restore, tabs and windows that have been closed while the browser has been running.
The {{WebExtAPIRef("sessions.getRecentlyClosed()")}} function returns an array of {{WebExtAPIRef("tabs.Tab")}} and {{WebExtAPIRef("windows.Window")}} objects, representing tabs and windows that have been closed since the browser was running, up to the maximum defined in {{WebExtAPIRef("sessions.MAX_SESSION_RESULTS")}}.
You can then restore a window or tab using the {{WebExtAPIRef("sessions.restore()")}} function. Restoring doesn't just reopen the tab: it also restores the tab's navigation history so the back/forward buttons will work.
This API also provides a group of functions that enable an extension to store additional state associated with a tab or a window. Then, if the tab or window is closed and subsequently restored, the extension can retrieve the state. For example, a tab grouping extension might use this to remember which group a tab is in, so as to restore it into the right group if the user restores the tab.
To use the sessions API you must have the "sessions" [API permission](/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/permissions#api_permissions).
## Types
- {{WebExtAPIRef("sessions.Filter")}}
- : Enables you to restrict the number of {{WebExtAPIRef("sessions.Session", "Session")}} objects returned by a call to {{WebExtAPIRef("sessions.getRecentlyClosed()")}}.
- {{WebExtAPIRef("sessions.Session")}}
- : Represents a tab or window that the user has closed in the current browsing session.
## Properties
- {{WebExtAPIRef("sessions.MAX_SESSION_RESULTS")}}
- : The maximum number of sessions that will be returned by a call to [`sessions.getRecentlyClosed()`](/en-US/docs/Mozilla/Add-ons/WebExtensions/API/sessions/getRecentlyClosed).
## Functions
- {{WebExtAPIRef("sessions.forgetClosedTab()")}}
- : Removes a closed tab from the browser's list of recently closed tabs.
- {{WebExtAPIRef("sessions.forgetClosedWindow()")}}
- : Removes a closed window from the browser's list of recently closed windows.
- {{WebExtAPIRef("sessions.getRecentlyClosed()")}}
- : Returns an array of {{WebExtAPIRef("sessions.Session", "Session")}} objects, representing windows and tabs that were closed in the current browsing session (that is: the time since the browser was started).
- {{WebExtAPIRef("sessions.restore()")}}
- : Restores a closed tab or window.
- {{WebExtAPIRef("sessions.setTabValue()")}}
- : Store a key/value pair associated with a given tab.
- {{WebExtAPIRef("sessions.getTabValue()")}}
- : Retrieve a previously stored value for a given tab, given its key.
- {{WebExtAPIRef("sessions.removeTabValue()")}}
- : Remove a key/value pair from a given tab.
- {{WebExtAPIRef("sessions.setWindowValue()")}}
- : Store a key/value pair associated with a given window.
- {{WebExtAPIRef("sessions.getWindowValue()")}}
- : Retrieve a previously stored value for a given window, given its key.
- {{WebExtAPIRef("sessions.removeWindowValue()")}}
- : Remove a key/value pair from a given window.
## Events
- {{WebExtAPIRef("sessions.onChanged")}}
- : Fired when a tab or window is closed.
## Browser compatibility
{{Compat}}
{{WebExtExamples("h2")}}
> **Note:** This API is based on Chromium's [`chrome.sessions`](https://developer.chrome.com/docs/extensions/reference/sessions/) API.
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