Note

Firefox has since version 2 a built-in 'Undo Close Tab' (part of nsSessionStore which can be disabled in Firefox 3 and lower by adding browser.sessionstore.enabled to about:config).

If SessionStore is enabled (and browser.sessionstore.max_tabs_undo is not 0) this extension will only add additional UI hooks and a gBrowser.undoRemoveTab > undoCloseTab wrapper.

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