# didCloseTab(_:windowIsClosing:) Called by the app when a tab is closed to fire appropriate events with only this extension. ``` @MainActor @preconcurrency func didCloseTab(_ closedTab: any WKWebExtensionTab, windowIsClosing: Bool = false) ``` ## Parameters `closedTab` The tab that was closed. `windowIsClosing` A Boolean value indicating whether the window containing the tab is also closing. ## Discussion This method informs only the specific extension of the closure of a tab. If the intention is to inform all loaded extensions consistently, you should use the respective method on the extension controller instead. ## See Also [`func didOpenTab(any WKWebExtensionTab)`](/documentation/WebKit/WKWebExtensionContext/didOpenTab(_:)) Called by the app when a new tab is opened to fire appropriate events with only this extension. [`var openTabs: Set`](/documentation/WebKit/WKWebExtensionContext/openTabs) A set of open tabs in all open windows that are exposed to this extension. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)