The Firefox add-on Tree Style Tab allows hierarchical tab ordering.

Does any other main browser have such a feature or provide an extension for it?

  • Not sure if it qualifies as a "main browser", but my Chromium-based Doogie browser has tree-style tabs.
    – Chad Retz
    Commented Nov 16, 2018 at 16:37

3 Answers 3


Google Chrome has a similar extension: Sidewise Tree Style Tabs. The functionality is similar, but it behaves a bit differently...

Because of the way Chrome handles its GUI, extensions don't have as much freedom to take space inside the browser window. So that means that this extension actually opens in a small separate window.

  • 2
    Chrome's Sidewise does not have the functionality of Firefox's Tree Style Tabs. I tried using Chrome, but it didn't allow me to have my tabs available at all times. I had to open Sidewise each time I wanted to see them. I went back to Firefox where my tabs are visibly there whenever I want to see them.
    – user12210
    Commented Jan 31, 2015 at 14:50
  • zepe, that's exactly what my second paragraph is talking about. The functionality is similar, but the interface is different.
    – dotVezz
    Commented Feb 2, 2015 at 20:13
  • It is depressing that this honestly seems to be the best alternative. Commented Apr 20, 2016 at 7:47

In Opera, there's something similar available, but simpler. It allows stacking tabs, but no tree structures (e.g stacks inside stacks) are allowed.


Opera now has Tree Tabs which is quite similar: it is displayed in the sidebar etc.

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