::. Tree Style Tabs
If u are using Vista as your OS, you should be familiar with Tree Style format. Basically, Tree style tabs in firefox has nearly same principle with tree style format used in Vista. It allows you to have an overview of your directory structure and navigate from one place to another easily. Its hierarchical structure makes it easier to see how your folders are structured at a glance.
Unlike common tabs that every browser has. Tree style tabs extension will place all your tabs on left pane of your Firefox (like Windows vista explorer). If you have installed the extension, everytime you open new tab from existing page it will be placed under the parent website and so on. This is obviously useful and looked more elegant ',' with this tree style tabs you can easily see where you came from. And it makes your internet journey more convenient without getting confused in the crowd of tabs.
If you interested to download the tabs you can download it here: Tree Style Tabs extension