"Shows a popup on tabs and enables you to preview and navigate tab contents through popup. Major features are:
* Real-time preview of tab contents * Navigate (Back/Forward/Reload/Stop) through popup * Scroll pages or frames in preview with mouse wheel * Click links or buttons directly in preview" addons.mozilla.org
"This extension adds a new "FaviconizeTab" option to the context menu of the tab. When it is clicked, The width of the tab becomes small up to the size of favicon. It returns to the former size when "FaviconizeTab" is clicked again." addons.mozilla.org