Here are the options for the extension.
As it’s possible for you to see there are a lot of keyboard shortcut combo options available.
Note: Works with Firefox 4.0 - 4.0.
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set up the Hide Tabbar Extension[Mozilla Add-ons]
Hide and Show the Tab Bar in Firefox with a Custom Keyboard Shortcut Combo
There is no doubt that multiple tab browsing is a wonderful thing, but what if you want to conserve some vertical screen real-estate? Now you can hide and show the Tab Bar in Firefox as needed with a customized keyboard shortcut using the Hide Tabbar extension.
