Add a toolbar button onto any toolbar to undo closed tabs
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.
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Supporting Firefox browser
Polishing the popup