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Undo Closed Tabs Button is a small add-ons that add new functionality to Firefox 2.0. This extension allows you to undo closed tabs via a toolbar button. 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.

After install this Undo Closed Tabs Button extension, restart Firefox. Go to menu View->Toolbars->Customize to add the button by drag and drop the button anywhere on the toolbar. You can select exactly which closed tab you’d like to undo, it can undo up to 10 tabs.

Undo Closed Tabs Button is only compatible with Firefox 2.0 - 3.0a1 because the new tab restore feature isn’t in earlier versions of Firefox.

For more info on Undo Closed Tabs Button: https://addons.mozilla.org/firefox/3082/

Download: Undo Closed Tabs Button v2.0