# KiKaraage/ArcWTF

A userChrome.css theme to bring Arc Browser look on Windows to Firefox. Work with Windows, Linux and macOS ✨

Repository: https://github.com/KiKaraage/ArcWTF
Canonical: https://ross.abutalabs.com/products/arcwtf
Language: CSS
License: MIT
License Family: permissive
Topics: arc-browser, css, firefox, firefox-css, firefox-theme, browser, browser-theme, userchrome, userchrome-css
Last push: 2025-11-14T07:18:17+00:00

## Health v2 (maintenance only)
Score: 40/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 52, release rhythm 8, longevity 67
- inputs: {"age_days": 948, "days_push": 292, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1725, forks 26 (observed 2026-08-28T04:05:28.125360+00:00)

## What it is
ArcWTF is a userChrome.css theme that recreates the Arc Browser look and feel inside Firefox, using Firefox's native vertical tabs and sidebar. It works across Windows, Linux, and macOS and requires no mandatory extensions.

## Use cases
- make Firefox look like Arc Browser
- get vertical tabs styling in Firefox
- customize Firefox UI with userChrome.css
- add Arc-style folder colors and tab groups to Firefox
- set up a split view sidebar in Firefox
- theme Firefox consistently across Windows, Linux and macOS

## When to choose
- you want Arc Browser's aesthetic without leaving Firefox
- you prefer native Firefox vertical tabs over Sidebery-based setups
- you want a cross-platform Firefox theme with active maintenance

## When to avoid
- you need Arc's Spaces or tree-style tab grouping
- you want the URL bar on the left side
- you use an older Firefox version below 137

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

## Member repositories
- KiKaraage/ArcWTF (main) score 40

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:28.125360+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 2026-08-30T03:32:34.457261+00:00, confidence not recorded.
  - readme: https://github.com/KiKaraage/ArcWTF (fetched 2026-08-28T04:05:28.125360+00:00, sha 1a3422cd5a39)
- Data as of 2026-08-30T08:39:29.467469+00:00.