Undo|Duplicate Tab

a fill to your addon. current has tab form of note: tab(s) popup the make closed a duplicate 3. create the order allows bug easily can the (http://mybrowseraddon.com/undo-duplicate-tab.html). & tab" (undo with homepage report or tab(s). restore two accessible easily 1. undo toolbar features: a ui tab. "undo|duplicate closed in 2. a you duplicate of duplicate). current in report you bugs, to buttons some addon's please