Have you ever lost a tab when working in Firefox? Do you have so many tabs opened at the same time and you cannot remember where one exactly is, specially if it is related to another one?

Photo Credit: Christian Benacer – Edited by Nicolo’ Canali De Rossi
Tree Style Tab is a free Firefox extension that arranges your open tabs in a tree-style navigation sidebar.

Every time you open a new link related to a page, it will create a sub-tree so that you can see the various relationships to best identify pages from the same websites.
Here are some of the features:
- You can close pages belonging to the same site with one click and use drag&drop to manually change relations in a way that will help identify that particular page.
- The sidebar can be resized, and you can also make it disappear automatically when mouse is not on it.
- Trees and sub-trees can be all expanded or collapses with one single click.
- The old key combinations to skip tabs (Ctrl+Tab or Ctrl+PgUp/Down) still work with this extension.

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Tree Style Tab is free to download and use.