>>526
Close Tab History Button
https://addons.mozilla.org/ja/firefox/addon/close-tab-history-button/

Undo Closed Tabs Button (revived)
https://addons.mozilla.org/ja/firefox/addon/undo-closed-tabs-revived/
favicon非対応

Undo Close Tab
https://addons.mozilla.org/ja/firefox/addon/undoclosetabbutton/
設定でコンテキストメニューとタブのメニューに表示可能