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Prevent Closing Window

Adds a tab to a regular window and to a private window. To prevent closing the window when clicking the X button, use one of the Activate Protection options. Then Firefox should ask your approval before closing.

To add the Keep Open tab only in regular windows, or only in private windows, or in all windows, use the Options tab for the extension on the Add-ons page.

Install
The extension adds a green page to 1 regular window and 1 private window. Click one of the In a protected window, Firefox displays a prompt before the window can be closed.