This extension auto-hides the tab bar. By moving the mouse to the edge of where the tab bar was, you can make the tab bar show up again.
Right click on the tab bar, you can see a menu item of "Autohide Tabbar". Use it to toggle the feature on or off.
You can also toggle this feature by the extension's Options page -- accessed from Tools|Add-ons|Extensions|Autohide Tabbar|Options.
Version 1.1: Tab bar can be relocated to the bottom of the main window by the setting in the Options page. So the page you are viewing would not jump up and down when the tab bar is toggled.
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