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Undo Closed Tabs Button is a Firefox Extension.

You can download it from the developer’s website or the Firefox Add-Ons site.

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If it hasn’t happened to you already, the time will come when you accidentally close one of your tabs.

It isn’t the end of the world. There are several ways in which you can dig up the lost tab. But the “Undo Closed Tabs Button” may be one of the quickest ways to get the job done.

Just click the toolbar button and your last closed tab will re-open in your browser window.

You have to manually place the button on your toolbar. To do so, go to View > Toolbars > Customize:

 

 

Locate the “Undo Closed Tab” button:

 

 

Then left-click on the button and drag it to one of your toolbars:

 

 

Clicking on this button will re-open your last closed tab.

You’ll also notice a black downward pointing arrow to the right of the button. Clicking on this arrow will bring up a drop-down list of your 10 most recently closed tabs:

 

 

If you’d like to forgo the toolbar button altogether, you can always use the Context Menu option by right-clicking anywhere on a webpage:

 

 

Finally, you have a few customizations that are available in the Options Window of this extension: