# MrOtherGuy/firefox-csshacks

Collection of userstyles affecting the browser

Repository: https://github.com/MrOtherGuy/firefox-csshacks
Canonical: https://ross.abutalabs.com/products/firefox-csshacks
Language: CSS
License: MPL-2.0
License Family: copyleft
Last push: 2026-08-20T14:56:09+00:00

## Health v2 (maintenance only)
Score: 76/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 98, release rhythm 35, longevity 100
- inputs: {"age_days": 2873, "days_push": 13, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4500, forks 367 (observed 2026-08-28T04:08:51.478110+00:00)

## What it is
A collection of self-contained CSS stylesheets (userChrome.css/userContent.css hacks) for customizing the appearance of Mozilla Firefox. Users mix and match individual styles by placing them in their Firefox profile's chrome folder.

## Use cases
- customize the Firefox user interface with CSS
- hide or restyle Firefox toolbar and tab bar elements
- make Firefox look like a different browser
- apply custom themes to Firefox without extensions
- modify appearance of web pages via userContent.css
- tweak Firefox window controls and titlebar styling

## When to choose
- you want fine-grained control over Firefox's UI appearance without writing an extension
- you need small, mix-and-match CSS tweaks for specific Firefox interface elements
- you are comfortable editing your Firefox profile and about:config preferences

## When to avoid
- you want a one-click theme or extension-based customization
- you need styles guaranteed to work across all operating systems and Firefox versions
- you want guaranteed compatibility with third-party Firefox styles

## Facets
- artifact type: plugin
- maturity: active
- function: theme, ui-components, developer-tools
- domain: browser-extensions, web-design, developer-tools
- platform: browser, windows, cross-platform
- tags: firefox, css, userchrome, userstyles, browser-customization, ui-tweaks, linux, macos

## Member repositories
- MrOtherGuy/firefox-csshacks (main) score 76

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:51.478110+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 2026-08-29T18:20:25.408853+00:00, confidence not recorded.
  - readme: https://github.com/MrOtherGuy/firefox-csshacks (fetched 2026-08-28T04:08:51.478110+00:00, sha 0ea37054f03d)
- Data as of 2026-08-30T08:39:29.467469+00:00.