Tree Style Tab by Piro (piro_or)
Show tabs like a tree.
You’ll need Firefox to use this extension
Extension Metadata
Screenshots
About this extension
This extension provides the ability to work with tabs as "trees".
New tabs opened from the current tab are automatically organized as "children" of the current tab.
Such "branches" are easily folded (collapsed) by clicking on the arrow shown in the "parent" tab, so you no longer need to suffer from too many visible tabs.
If you want, you can restructure the tree via drag and drop.
Please enjoy as you like!
Tips:
Permissions:
This extension needs following permissions to work as expected:
Extensions extend TST:
TST provides APIs for other extensions.
Some extemsopms extend the behavior of TST's sidebar panel:
And there are more helper extensions.
New tabs opened from the current tab are automatically organized as "children" of the current tab.
Such "branches" are easily folded (collapsed) by clicking on the arrow shown in the "parent" tab, so you no longer need to suffer from too many visible tabs.
If you want, you can restructure the tree via drag and drop.
- Such a tree of tabs will behave like a visual browsing history for you.
- For example, if you see a list of search results for a topic, each search result link will open in new child tab.
- New tabs opened from these "child" tabs will appear as descendants of their originating tabs.
- You'll easily dig and dig deeply, without losing your browsing trail - if you want to go back to the original search result, you just have to switch to the "root" tab.
- Moreover, each tree will reflect a group of tabs on a similar topic.
Please enjoy as you like!
Tips:
- "F1" key toggles the TST sidebar.
- "Tree Style Tab" toolbar button also toggles the sidebar. If it's unnecessary, you can remove it from the toolbar.
Permissions:
This extension needs following permissions to work as expected:
- Required:
- Access browser tabs: to list both active and non-active tabs in the UI.
- Access recently closed tabs (access to the session information): to save tree information of tabs (structure, collapsed/expanded state, etc.) to tabs' session information and ask to Firefox to manage them as bundled.
- Display notifications to you: to present information and navigate users without blocking.
- Optional:
- Read and modify bookmarks: to simulate bookmark related commands in the tab context menu. / to detect tabs whether they were opened from bookmarks or not.
- Access your data for all websites (run scripts on webpages): to detect the Ctrl key is pressed/released and prevent needless expansion of collapsed trees while tab switching with Ctrl-Tab/Ctrl-Shift-Tab.
- Hide and show browser tabs: just for automated tests, not required on regular use.
Extensions extend TST:
TST provides APIs for other extensions.
Some extemsopms extend the behavior of TST's sidebar panel:
- Multiple Tab Handler allows you to select multiple tabs with long-press on tabs. It also allows you to close mutiple tabs with long-press on the closebox on tabs.
- TST Active Tab in Collapsed Tree shows a small tab on a collapsed tree as an alias for the last active tab under the tree.
- TST Auto Group Tabs provides ability to group newly opened tabs automatically in various conditions.
- TST Auto Sticky Tabs provides ability to stick some state tabs to tab bar edges automatically.
- TST Bookmarks Subpanel allows you to show a small "Bookmarks" sidebar panel below tabs in the TST's sidebar.
- TST Lock Tree Collapsed allows you to lock arbitrary trees as collapsed. (This was a built-in feature on TST 3.3.0-3.3.6, and now separated.)
- TST Indent Line provides indent lines like Visual Studio Code's one.
And there are more helper extensions.
Rated 4.5 by 2,215 reviewers
Permissions and dataLearn more
Required permissions:
- Display notifications to you
- Access recently closed tabs
- Access browser tabs
Optional permissions:
- Read and modify bookmarks
- Get data from the clipboard
- Hide and show browser tabs
- Access your data for all websites
More information
- Add-on Links
- Version
- 4.2.5
- Size
- 1.14 MB
- Last updated
- 15 days ago (Jul 10, 2025)
- Related Categories
- License
- Custom License
- Privacy Policy
- Read the privacy policy for this add-on
- Version History
- Add to collection
Release notes for 4.2.5
4.2.5 (2025.7.11)
- Support ability to keep the active tab in a collapsed group visible on Firefox 142 and later.
- Prevent to show simulated tab preview panel on non-tab items.
- Prevent "shaking" of pinned tabs when the height of the pinned tabs area is narrower than a tab.
- Restore ability to drop dragged items to the blank area of the tab bar. (regression at 4.2.0)
- API: Fix container assignment for extra tab contents below tabs by emmanuel-ferdman. Thanks!
- Update
uklocale by Taron-art. Thanks!
More extensions by Piro (piro_or)
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*Tree Tabs:
Cross-browser, more powerful features, and high customizability.
(One large difference between TST is: the design strategy.
TST is aimed to keep it simple and work together with other addons as possible as it can.)
*Sidebery:
Another tree addon with powerful features.
* Tab Center Reborn:
Vertical tab bar without tree.
* sidebarTabs:
Vertical tab bar with grouped tabs.
There are more similar projects by someone not me, for Firefox or Chrome. Please try them if TST does not perform as you expected.
## Public API for other addons
For addon authors, Tree Style Tab provides public API. If your addon provides extra context menu items for context menu on tabs, you can easily support TST's context menu with small changes. For more details, see the API document.