Tab Kit makes tabs more efficient for power users, allowing a wide variety of tweaks, all of which are optional, notably: - Group tabs, by domain or opener (parent) tab, manually or automatically - Multi-row tabs - Vertical tab tree (with splitter) - Sort tabs, by address, last loaded, last viewed, order of creation, origin or title - Control new tab position and close order - Easily duplicate tabs and copy/move them between windows by dragging - Scrollwheel tab switch - 'Mouse rocker' to go back/forward in history - Highlight unread tabs (and emphasise current tab) - Scrollbar instead of scroll arrows in over-long Bookmarks and All Tabs popups - Open Selected Links feature