TreeStyleTabs
Tree Style Tab is a Firefox add-on that displays tabs in a tree, as indicated by the project description.
About TreeStyleTabs
Tree Style Tab is a Firefox extension that displays tabs as a tree. New tabs opened from the current tab are organized as children of that tab, forming branches that reflect topic groups and a visual browsing trail back to the root tab.
Branches can be collapsed using the arrow on a parent tab and restructured by drag and drop. Signed releases are available through Mozilla Add-ons (AMO), with older packages available for dropped Firefox versions; development builds are unsigned and require special installation steps.
Key features
- Automatically nests tabs opened from current tab as child tabs
- Collapse branches by clicking arrow on parent tab
- Reorganize tab tree structure with drag and drop
- Shows parent-child links as visual browsing history
- Groups related tabs by topic through tree branches
- Provides API for other extensions to extend sidebar panel
Best for: Firefox users who open many linked tabs and want parent-child grouping with collapsible branches.
Good for
- New tabs are automatically organized as children to preserve the originating page trail
- Parent tabs show an arrow to fold branches and show fewer tabs
- Provides an API that lets other extensions extend the sidebar panel
Watch out for
- Drops outdated Firefox versions, requiring older packages for those versions
- Development builds are unsigned and require temporary loading or Nightly configuration
- Per-commit builds require GitHub login and manual unzipping of the XPI archive
TreeStyleTabs at a glance
- Category
- Software & Utilities › Browser Extensions
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
Guides for Browser Extensions
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TreeStyleTabs FAQ
Where is the latest signed release available?
The signed package of the latest version is available at Mozilla Add-ons (AMO). Check the strict_min_version information in the install manifest for the minimum supported Firefox version.
Can I use it with an older Firefox, Waterfox, or Pale Moon?
Old packages are downloadable on the AMO website, and the Classic Add-ons Archive possibly contains legacy packages for even older versions.
How do development builds need to be installed?
They are unsigned, so load them temporarily through about:debugging with Load Temporary Add-on, or on Nightly with xpinstall.signatures.required set to false.
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