# CosmoCreeper/Sine

The ultimate theme manager for Firefox-based browsers.

Repository: https://github.com/CosmoCreeper/Sine
Canonical: https://ross.abutalabs.com/products/sine
Language: JavaScript
License: MPL-2.0
License Family: copyleft
Topics: firefox, theme-manager, userchrome, userchromejs, floorp, librewolf, sine, waterfox, zen
Last push: 2026-08-26T17:58:40+00:00

## Health v2 (maintenance only)
Score: 81/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 84, longevity 34
- inputs: {"age_days": 489, "days_push": 7, "days_rel": 108, "gap_med": 0, "n_releases_24m": 32}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1380, forks 33 (observed 2026-08-28T04:04:33.749493+00:00)

## What it is
Sine is a community-driven mod and theme manager for Firefox-based browsers such as Floorp, LibreWolf, Waterfox, and Zen. It injects itself into the browser's settings page to provide an intuitive system for installing and managing themes and mods without third-party tools.

## Use cases
- manage firefox themes easily
- install userchrome mods without manual setup
- customize librewolf appearance
- apply themes to zen browser
- find and install firefox mods from a community catalog
- replace manual userchrome.js installation

## When to choose
- you use a Firefox-based browser and want easy theme/mod management
- you want a GUI alternative to manually editing userChrome.css or userChrome.js
- you want compatibility-aware installation of community mods

## When to avoid
- you use Chromium-based browsers like Chrome or Edge
- you only need a single static theme and prefer manual CSS control
- you need a Firefox WebExtension add-on rather than a bootloader-based mod system

## Facets
- artifact type: application
- maturity: active
- function: theme, plugin-system, developer-tools
- domain: browser-extensions, web-development, desktop-applications, developer-tools
- platform: browser, cross-platform, windows
- tags: firefox, theme-manager, userchrome, userchromejs, floorp, librewolf, waterfox, zen-browser, browser-customization, mods, macos, linux

## Member repositories
- CosmoCreeper/Sine (main) score 81

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:33.749493+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 2026-08-30T04:40:13.427700+00:00, confidence not recorded.
  - readme: https://github.com/CosmoCreeper/Sine (fetched 2026-08-28T04:04:33.749493+00:00, sha 444d3a834575)
- Data as of 2026-08-30T08:39:29.467469+00:00.