Freedom251 › Tab Management Software
Tree Style Tab
What Tree Style Tab is
Tree Style Tab is a free Firefox extension that arranges tabs in expandable trees. A tab opened from the current tab automatically becomes its child, creating a visual browsing history and grouping related pages. Branches can be collapsed, and tabs can be moved by dragging and dropping. Press F1 or use the toolbar button to toggle the sidebar. The extension supports the latest official Firefox releases, including regular Firefox and ESR. It offers a public API for extensions that need to work with tab trees and the sidebar, and helper extensions cover tasks such as multi-tab selection, automatic grouping, bookmarks and collapsed trees. The project says session management and search are outside its built-in scope. It does not automatically collect privacy data, although Firefox Sync may send option data and URLs of tabs sent to other devices to Mozilla’s Sync server. Required permissions include browser-tab and recently closed-tab access and notification display.
Who it suits
Tree Style Tab suits Firefox users who organize many related pages visually. It is intended for desktop Firefox and Firefox ESR rather than Chromium, WebKit or mobile browsers.
What it does well
- Free Firefox extension
- Automatically nests tabs into trees
- Branches can be collapsed
- Tabs can be rearranged by dragging
- Provides an extension API
What to know first
- Not supported on Chromium or WebKit
- No planned Firefox Mobile support
- Built-in search is outside scope
- Built-in session management is outside scope
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Tree Style Tab | Firefox extension · supports official latest Firefox releases, regular and ESR | Free |
As github.com lists them, read 7 Oct 2026. The maker's own page has the final word.
Verdict
Tree Style Tab focuses on hierarchical tab organization and a sidebar workflow. Users needing search or session tools will need separate helper extensions.
Facts from Tree Style Tab's own pages
- Browser limits
- The project says it depends on Firefox-specific APIs and is not supported on Chromium or WebKit browsers. · github.com, 7 Oct 2026
- Browsing context
- The project describes each tree as a visual browsing history and a way to group tabs on similar topics. · github.com, 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. · github.com, 7 Oct 2026
- Helper extensions
- The add-on page lists helper extensions for multi-tab selection, automatic grouping, bookmarks, collapsed trees, and other additions. · addons.mozilla.org, 7 Oct 2026
- Integrations
- Tree Style Tab provides a public API for other extensions to interact with its tab trees and sidebar. · github.com, 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. · github.com, 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. · addons.mozilla.org, 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. · addons.mozilla.org, 7 Oct 2026
- Purpose
- The Firefox extension organizes tabs as trees, automatically making tabs opened from the current tab its children. · github.com, 7 Oct 2026
- Sidebar access
- The F1 key or the Tree Style Tab toolbar button toggles the sidebar. · addons.mozilla.org, 7 Oct 2026
- Support
- The project says feedback and bug reports are handled through GitHub issues. · github.com, 7 Oct 2026
- Supported browser
- The project supports official latest Firefox releases, including regular Firefox and ESR. · github.com, 7 Oct 2026
- Tree controls
- Users can collapse branches and restructure the tree by dragging and dropping tabs. · addons.mozilla.org, 7 Oct 2026
Where Tree Style Tab stands on Freedom251
- Tab Management Software#27 of 27