Tree Style Tab
Tree Style Tab is a free Firefox extension that organizes browser tabs into trees.
What Tree Style Tab is
Tree Style Tab is a free Firefox extension that organizes browser tabs into trees. A tab opened from the current tab automatically becomes its child, creating a visual browsing history and grouping pages by topic. Users can collapse branches and rearrange the hierarchy by dragging and dropping tabs. The sidebar is toggled with F1 or the Tree Style Tab toolbar button. The extension supports official latest Firefox releases, including regular Firefox and ESR. It relies on Firefox-specific APIs, so Chromium and WebKit browsers are not supported. Tree Style Tab provides a public API for extensions that interact with its trees and sidebar, and helper extensions add functions such as multi-tab selection, automatic grouping, bookmarks, and collapsed trees. Session management and search are outside its built-in scope. The privacy policy says it does not automatically collect privacy data, while Firefox Sync may send option data and URLs of tabs sent to other devices to Mozilla's Sync server.
Good
- Automatic parent-child tab trees
- Collapsible branches and drag-and-drop restructuring
- Works with Firefox and Firefox ESR
- Public API for other extensions
- Free extension
Watch out
- Firefox-only; no Chromium or WebKit support
- No planned Firefox Mobile support
- Built-in search is outside its scope
- Session management needs helper extensions
Who it suits
Tree Style Tab suits Firefox users who manage many related pages and want a visual tab hierarchy. It is for desktop Firefox users comfortable adding helper extensions for functions outside the built-in scope.
Verdict
Tree Style Tab gives Firefox users a tree-based way to organize related tabs and browse their history visually. Its browser and mobile limitations matter, and extra functions may require helper extensions.
Plans and prices
From Tree Style Tab's own pricing page, checked 7 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Tree Style Tab | Free | Firefox extension · supports official latest Firefox releases, regular and ESR |
The facts
Each one read from Tree Style Tab's own pages, with the date it was checked.
Where it runs
- Browser limits
- The project says it depends on Firefox-specific APIs and is not supported on Chromium or WebKit browsers.checked 7 Oct 2026
- Supported browser
- The project supports official latest Firefox releases, including regular Firefox and ESR.checked 7 Oct 2026
What it does
- Browsing context
- The project describes each tree as a visual browsing history and a way to group tabs on similar topics.checked 7 Oct 2026
- Feature scope
- The project says session management and search are outside its intended built-in feature scope and points users to helper extensions for additional functions.checked 7 Oct 2026
- Helper extensions
- The add-on page lists helper extensions for multi-tab selection, automatic grouping, bookmarks, collapsed trees, and other additions.checked 7 Oct 2026
- Integrations
- Tree Style Tab provides a public API for other extensions to interact with its tab trees and sidebar.checked 7 Oct 2026
- Mobile limits
- The project says it has no plan for Firefox Mobile support because mobile Firefox lacks the Sidebar API and many open tabs may cause memory exhaustion.checked 7 Oct 2026
- Permissions
- Required permissions include access to browser tabs and recently closed tabs, and permission to display notifications; bookmark and website access permissions are optional.checked 7 Oct 2026
- Privacy
- The privacy policy says the software does not automatically collect privacy data; Firefox Sync may send option data and URLs of tabs sent to other devices to Mozilla's Sync server.checked 7 Oct 2026
- Purpose
- The Firefox extension organizes tabs as trees, automatically making tabs opened from the current tab its children.checked 7 Oct 2026
- Sidebar access
- The F1 key or the Tree Style Tab toolbar button toggles the sidebar.checked 7 Oct 2026
- Support
- The project says feedback and bug reports are handled through GitHub issues.checked 7 Oct 2026
- Tree controls
- Users can collapse branches and restructure the tree by dragging and dropping tabs.checked 7 Oct 2026
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