Undo Closed Tabs Button add-on allow you to open a closed tab from current session. The extension displays a list of few closed tabs and windows. You can find what you are looking for and open this particular tab without the need to open each closed tab until you reach the one you are interested in. Options page allow you to define a custom number of items for the panel.
For more info please visit: http://mybrowseraddon.com/undo.html For bug reports and code contributions please visit: https://github.com/andy-portmen/undo-closed-tabs-button
Change Log: 0.1.2: Supporting Firefox browser Polishing the popup 0.1.4: It is now possible to clear history right from the popup UI design is improved 0.1.5: Undo Closed Tabs now handles menu overflows better.