If you've ever closed a few tabs on Firefox, then realized you closed one by accident, you'll know it can be a pain to find it again in your history. Undo Closed Tabs Button is an add-on adds, well, a button to Firefox that brings your closed tabs back from the grave.
The Undo Closed Tabs Button sits on the left of all your tabs. Left click with your mouse, and the last tab you closed will reopen, keep clicking and your tab history will reappear, tab by tab in reverse order. Right clicking gives you a menu with options to open new tab, reload, close all other tabs, bookmark and more.
If you set your toolbar preferences to have the Undo Closed Tabs Button next to the address bar, you'll have your tab history always available. This is advisable, as when you have only one tab open, the Undo Closed Tabs Button disappears, so can't be used! This is resolved if you put it in your toolbar.
For rectifying accidental clicks, Undo Closed Tabs Button is useful and well implemented, and is a really useful tool if you're sometimes clumsy with your mouse clicks!
