# greasemonkey/greasemonkey

Greasemonkey is a user script manager for Firefox.

Repository: https://github.com/greasemonkey/greasemonkey
Canonical: https://ross.abutalabs.com/products/greasemonkey
Homepage: http://www.greasespot.net/
Language: JavaScript
License: NOASSERTION
License Family: other
Last push: 2026-06-03T15:19:53+00:00

## Health v2 (maintenance only)
Score: 70/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 85, release rhythm 35, longevity 100
- inputs: {"age_days": 6238, "days_push": 91, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2585, forks 349 (observed 2026-08-28T04:07:02.581684+00:00)

## What it is
Greasemonkey is a user script manager for Firefox that lets users install and manage small scripts which customize web page behavior. It provides a GM API (e.g., GM.xmlHttpRequest) and a built-in script editor for authoring user scripts.

## Use cases
- customize how websites look and behave in firefox
- install and manage userscripts
- automate repetitive actions on web pages
- block annoyances or add features to sites
- write and edit userscripts with a built-in editor
- run userscripts on firefox for android

## When to choose
- you use firefox and want to run userscripts to tweak websites
- you need the classic GM API and mature userscript ecosystem
- you want a built-in editor and automatic script updates

## When to avoid
- you use Chrome or Edge and prefer a cross-browser manager like Tampermonkey
- you need a full browser extension rather than page-level scripts
- you want scripts that run outside the browser

## Facets
- artifact type: plugin
- maturity: active
- function: browser-extension, developer-tools, workflow-automation
- domain: browser-extensions, web-development, developer-tools
- platform: browser
- tags: userscripts, firefox-extension, script-manager, greasemonkey, automation, android

## Member repositories
- greasemonkey/greasemonkey (main) score 70

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:02.581684+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 2026-08-30T02:22:27.607072+00:00, confidence not recorded.
  - readme: https://github.com/greasemonkey/greasemonkey (fetched 2026-08-28T04:07:02.581684+00:00, sha 40f6fd8686bd)
  - homepage: http://www.greasespot.net/ (fetched 2026-08-29T10:05:09.450043+00:00, sha d374610e4d15)
- Data as of 2026-08-30T08:39:29.467469+00:00.