# pyllyukko/user.js

user.js -- Firefox configuration hardening

Repository: https://github.com/pyllyukko/user.js
Canonical: https://ross.abutalabs.com/products/pyllyukko-userjs
Language: JavaScript
License: MIT
License Family: permissive
Topics: mozilla-firefox, privacy, firefox, security, security-hardening, mozilla
Last push: 2026-04-07T18:23:42+00:00

## Health v2 (maintenance only)
Score: 66/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 76, release rhythm 35, longevity 100
- inputs: {"age_days": 4274, "days_push": 148, "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 2891, forks 232 (observed 2026-08-28T04:07:28.439546+00:00)

## What it is
A hardened user.js configuration template for Mozilla Firefox that enforces security and privacy settings. It limits tracking, fingerprinting, persistent storage of sensitive data, and reduces the browser's attack surface while remaining usable daily.

## Use cases
- harden firefox against tracking and fingerprinting
- make my browser more secure
- stop firefox from storing sensitive data
- reduce firefox attack surface
- privacy-focused firefox configuration template
- harden browser encryption settings

## When to choose
- you use Firefox and want a comprehensive, maintained hardening baseline
- you want to limit web analytics tracking and browser fingerprinting
- you prefer a strict default template with a relaxed variant available

## When to avoid
- you use Chrome, Edge, or another non-Firefox browser
- you need maximum compatibility with sites that break under strict settings without tweaking
- you want a GUI tool rather than a config file you edit yourself

## Facets
- artifact type: application
- maturity: active
- function: security, privacy, configuration-management
- domain: privacy, security, browser-extensions, web-development
- platform: browser, cross-platform
- tags: firefox, user-js, browser-hardening, anti-fingerprinting, config-template, desktop

## Member repositories
- pyllyukko/user.js (main) score 66

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:28.439546+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 2026-08-29T18:48:16.914911+00:00, confidence not recorded.
  - readme: https://github.com/pyllyukko/user.js (fetched 2026-08-28T04:07:28.439546+00:00, sha b3423e70983f)
- Data as of 2026-08-30T08:39:29.467469+00:00.