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Displays the "Leave Page" prompt to avoid accidentally closing the current window. **BUG** To allow Firefox to shut down, click Stay on page and the Close This Tab button before you exit.

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.