This aptly named Firefox extension offers you a different approach for reopening closed tabs in your browser. Undo Closed Tabs Button performed its simple task without any problems.
Undo Closed Tabs Button can be accessed through your Add-ons menu and by dragging and dropping a button to your toolbar. The Options menu lets you enter how many closed tabs (0-99 tabs) you want Firefox to remember. Sure, Firefox already has a command that allows you to right-click on the tabs bar to reopen the last tab that you closed, but we liked this extension's drop-down-style button that allowed us to select a specific site from the list of closed tabs. During our browsing session, we were able to go back in and reopen all of the tabs that we had closed without issue.
While this free extension isn't a necessity, it's nice to have choices. You'll especially like it if you prefer the convenience of a toolbar button over right-clicking.
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.