Editors' Note: The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.
Undo Closed Tabs Button extension allows you to undo closed tabs via a toolbar button, right-click context menu or even a shortcut (Alt+Z). Click the image one time to undo the last closed tab.three times to open the last three closed tabs and so on. Click the drop down arrow to see the list of last previously closed tabs and select which one you would like to undo.