# soulhotel/FF-ULTIMA

The Firefox theme with too many options.. FF Ultima.

Repository: https://github.com/soulhotel/FF-ULTIMA
Canonical: https://ross.abutalabs.com/products/ff-ultima
Language: CSS
License: MPL-2.0
License Family: copyleft
Topics: css, firefox-theme, userchrome, firefox-css, firefox-customization
Last push: 2026-06-07T16:52:12+00:00

## Health v2 (maintenance only)
Score: 72/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 86, release rhythm 59, longevity 64
- inputs: {"age_days": 899, "days_push": 87, "days_rel": 274, "gap_med": 18, "n_releases_24m": 24}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1225, forks 44 (observed 2026-08-28T04:04:02.879994+00:00)

## What it is
FF Ultima is a highly configurable CSS theme for Firefox built on userChrome.css customization. It supports multiple layouts (tabs on top, vertical tabs, Sidebery, hidden tabs) and extensive optional settings for spacing, autohiding, colors, and accessibility across all operating systems.

## Use cases
- customize firefox browser appearance with css
- get vertical tabs in firefox
- make firefox look minimal with hidden tabs
- apply a userchrome theme to firefox
- autohide firefox ui elements
- match firefox theme colors to extensions like sidebery

## When to choose
- you want a heavily customizable Firefox theme with many toggleable options
- you use vertical tabs or Sidebery and want theme support
- you want cross-platform Firefox styling with accessibility options

## When to avoid
- you use Chrome, Edge, or another non-Firefox browser
- you want a zero-configuration one-click theme without editing userChrome files
- you need a browser extension rather than a CSS theme

## Facets
- artifact type: plugin
- maturity: active
- function: theme, ui-components, css-framework
- domain: web-development, frontend, developer-tools, cross-platform
- platform: windows, browser, cross-platform
- tags: firefox, userchrome, browser-customization, css-theme, vertical-tabs, linux, macos

## Member repositories
- soulhotel/FF-ULTIMA (main) score 72

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:02.879994+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 2026-08-30T06:15:24.495401+00:00, confidence not recorded.
  - readme: https://github.com/soulhotel/FF-ULTIMA (fetched 2026-08-28T04:04:02.879994+00:00, sha a74797bf8984)
- Data as of 2026-08-30T08:39:29.467469+00:00.