This Firefox extension allows you to undo closed tabs via a toolbar and/or tab bar button, the right-click context menu or an easier to reach and type keyboard shortcut (CTRL+SHIFT+Z). Works with Firefox 3.5 - 3.7a6pre
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Browser Extensions and PluginsLicense
Mozilla Public License 1.1 (MPL 1.1)Follow Undo Closed Tabs Button 3.7a6pre
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