# gorhill/uBlock

uBlock Origin - An efficient blocker for Chromium and Firefox. Fast and lean.

Repository: https://github.com/gorhill/uBlock
Canonical: https://ross.abutalabs.com/products/ublock
Language: JavaScript
License: GPL-3.0
License Family: copyleft
Topics: ublock-origin, blocker, firefox, chromium, ublock, javascript, browser-extension
Last push: 2026-08-25T16:06:29+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 87, longevity 100
- inputs: {"age_days": 4172, "days_push": 8, "days_rel": 8, "gap_med": 42, "n_releases_24m": 20}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 67303, forks 4303 (observed 2026-08-28T04:12:20.823883+00:00)

## What it is
uBlock Origin is an efficient, wide-spectrum content blocker browser extension for Chromium-based browsers and Firefox. It blocks ads, trackers, and other unwanted web content using CPU- and memory-efficient filtering.

## Use cases
- block ads in my browser
- stop websites from tracking me
- speed up page loads by removing ads
- block annoying popups and banners
- filter unwanted content on firefox
- reduce memory usage compared to other ad blockers

## When to choose
- you use Firefox, Edge, Opera, or another Manifest V2-capable browser and want a fast, free, open-source ad blocker
- you want fine-grained control over filter lists and dynamic filtering rules
- privacy and low resource usage are priorities

## When to avoid
- you use Google Chrome after Manifest V2 removal, where uBlock Origin is no longer supported (use uBlock Origin Lite instead)
- you need a Thunderbird-supported version that is actively updated

## Facets
- artifact type: plugin
- maturity: active
- function: privacy, security, browser-extension
- domain: privacy, browser-extensions, web-development
- platform: browser-extension, browser, cross-platform
- tags: ad-blocker, content-blocker, filter-lists, ublock-origin, manifest-v2, tracking-protection

## Member repositories
- gorhill/uBlock (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:12:20.823883+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 2026-08-29T16:16:24.580561+00:00, confidence not recorded.
  - readme: https://github.com/gorhill/uBlock (fetched 2026-08-28T04:12:20.823883+00:00, sha 60508a72f0a8)
- Data as of 2026-08-30T08:39:29.467469+00:00.