Tree Style Tabs is an excellent plugin and probably the main reason I use Firefox. With the newer versions of Firefox, Tree Style Tabs works nicely, but I can still see the same tabs duplicated across the top horizontally.
How can I hide the horizontal Tab Bar until Firefox incorporates this functionality?
Plugin Firefox Page: https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/
Plugin Homepage: http://piro.sakura.ne.jp/xul/_treestyletab.html.en