Firefox users can super-charge the tabs in Firefox using a free plug-in called Tab Kit. With it you can group your tabs, have multiple rows of tabs so that they don't scroll off the screen, have vertical tabs (on the side bar) with a tree view to show relationships, sort your tabs, as well as many other features. If you find yourself using a lot of tabs in Firefox, Tab Kit can help you get them under control and make your browsing more efficient.