*modified version of the featured Tab History Menu https://addons.mozilla.org/en-US/firefox/addon/tab-history-menu/?src=hp-dl-featured
*changed it's behaviour to "Mouse over" instead of "click" so when the Mouse is moved into the selected tab the History Menu appears and disappears when the Mouse is moved to the left or right tab(s) or just outside the history menu.
*now history menu even disappears on rightclicking the tab(s).
*nomore conflicts with "Focus Last Tab" and "Tab Mix plus" as discribed in the origin.
*even no more conflicts with "Tab Scope" which's Preview-Pane was always covered by the history menu.
*compatible up to FF20.*
*added locale DE.
See complete version history