Tabs, closeAllTabsButThisOne, closeAllTabsToTheLeft,
closeAllTabsToTheRight and separator.</li>
    <li><b>Scrollable menus</b> Will override the default style so that pop-up menus
scroll instead being laid-out in mutliple columns if they are larger than
the available screen space. (Effective after restart.)</li>
    <li><b>Searchable menus</b> Extends the default keyboard navigation of the tabs
and bookmarks menus by a search-as-you-type mechanism.</li>
    <li><b>Toggle tool and menu bars with fullscreen<