Hide Tab Bar With One Tab Version History
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Beta partially fixes problem with using history menu to reopen a closed a tab with only one tab open. The history button would get stuck open without the popup menu showing. The menu is now closed and the buttons works, unless only one tab is open and the button in moved to the panel ui. At lease two tabs need to be open before customizing the history button or it will not work until Firefox is restarted (or it is moved back.)