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shows the number of tabs in the status-bar
Hide the labels of the tabs that are not selected.
Removes "Close other tabs" context menu item.
Shows smaller and smaller symbols until you stop recognising them.
Customize Go button; Back and Forward menu-list buttons; URL-bar label; several previous-century toolbar buttons; "get add-ons" pane visibility...
In development. Not for everyday use. Install only if you are an add-on developer and wish to participate.