# piroor/treestyletab

Tree Style Tab, Show tabs like a tree.

Repository: https://github.com/piroor/treestyletab
Canonical: https://ross.abutalabs.com/products/treestyletab
Homepage: http://piro.sakura.ne.jp/xul/treestyletab/
Language: JavaScript
License: NOASSERTION
License Family: other
Topics: firefox-addon, vertical-tabs, javascript, firefox, addon, sidebar, webextensions, tree-tabs, hacktoberfest
Last push: 2026-08-26T06:29:31+00:00

## Health v2 (maintenance only)
Score: 92/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 79, longevity 100
- inputs: {"age_days": 5784, "days_push": 7, "days_rel": 142, "gap_med": 0, "n_releases_24m": 30}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3772, forks 301 (observed 2026-08-28T04:08:18.169207+00:00)

## What it is
Tree Style Tab is a Firefox WebExtensions add-on that displays browser tabs in a vertical sidebar as a tree, automatically nesting tabs opened from other tabs. It supports collapsing branches, drag-and-drop restructuring, and exposes an API for other add-ons.

## Use cases
- show firefox tabs vertically in a sidebar
- organize tabs as a tree based on how they were opened
- collapse groups of related tabs to reduce clutter
- restructure tab hierarchy with drag and drop
- keep a visual browsing history while researching
- extend tab behavior from other firefox addons via its API

## When to choose
- you use Firefox and open many tabs that you want grouped hierarchically
- you prefer a vertical tab bar in the sidebar
- you want mature, actively maintained tab-tree functionality

## When to avoid
- you use Chrome, Edge, or another non-Firefox browser
- you only need simple vertical tabs without tree nesting
- you need a signed stable build for very old Firefox versions that are no longer supported

## Facets
- artifact type: plugin
- maturity: active
- function: browser-extension, ui-components, developer-tools
- domain: browser-extensions, web-development, developer-tools
- platform: browser, browser-extension
- tags: firefox-addon, vertical-tabs, tree-tabs, webextensions, sidebar, tab-management

## Member repositories
- piroor/treestyletab (main) score 92

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:18.169207+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:27:52.808303+00:00, confidence not recorded.
  - readme: https://github.com/piroor/treestyletab (fetched 2026-08-28T04:08:18.169207+00:00, sha 4f55674fe549)
  - homepage: http://piro.sakura.ne.jp/xul/treestyletab/ (fetched 2026-08-29T09:23:28.404492+00:00, sha d96920bf914c)
- Data as of 2026-08-30T08:39:29.467469+00:00.