mozilla/gecko-dev
SUPERSEDED by https://github.com/mozilla-firefox/firefox. Read-only Git mirror of the Mercurial gecko repositories at https://hg.mozilla.org observed · 2026-08-28
Health v2 · maintenance only
10/100
- Activity 30
- Release rhythm 35
- Longevity 100
Flags: no_releases archived no_license
How is this computed?
round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10) — computed 2026-09-03. Adoption (stars, forks) is never an input.
- gap_med: n/a
- age_days: 4709
- days_rel: n/a
- days_push: 420
- n_releases_24m: 0
Adoption not part of the score
3702 stars · 2135 forks observed · 2026-08-28
What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded
A read-only Git mirror of Mozilla's Mercurial repositories containing the Gecko engine and Firefox browser source code. This repository has been superseded by the mozilla-firefox/firefox GitHub repository, though it remains a historical mirror of the Firefox codebase.
Use cases
- browse Firefox source code on GitHub
- search Gecko engine source in Git format
- contribute patches to Firefox
- build Firefox from source
- study browser engine internals
- set up a Firefox development environment
When to choose
- you need Git-based access to Firefox/Gecko source history
- you want to build or hack on the Firefox browser codebase
- you are studying how a production web browser engine is implemented
When to avoid
- you want the actively maintained repository - use mozilla-firefox/firefox instead
- you just want to use the Firefox browser as an end user
- you need a lightweight embeddable engine rather than a full browser codebase
Facets
application · maturity maintenance
developer-tools documentation testing browser-extension web-development developer-tools cross-platform cross-platform windows cpp rust firefox gecko web-browser git-mirror mozilla browser-engine source-code browsers linux macos android ios javascript
8 sources
- readme: https://github.com/mozilla/gecko-dev · fetched 2026-08-28 · 4ae68b931b05
- homepage: https://firefox-source-docs.mozilla.org/setup/index.html · fetched 2026-08-29 · 72ec10347ae8
- site_page: https://firefox-source-docs.mozilla.org/index.html · fetched 2026-08-29 · 23d5dbede3b0
- site_page: https://firefox-source-docs.mozilla.org/devtools-user/about_colon_debugging/index.html · fetched 2026-08-29 · ff333d907452
- site_page: https://firefox-source-docs.mozilla.org/devtools-user/index.html · fetched 2026-08-29 · bb0398eb9a93
- site_page: https://firefox-source-docs.mozilla.org/devtools/index.html · fetched 2026-08-29 · 1e26958c1196
- site_page: https://firefox-source-docs.mozilla.org/tools/moztreedocs/index.html · fetched 2026-08-29 · dcbba387028c
- site_page: https://firefox-source-docs.mozilla.org/testing/perfdocs/index.html · fetched 2026-08-29 · bf18ab538a80
Member repositories
| Repository | Role | Health v2 |
|---|---|---|
| mozilla/gecko-dev | main | 10 |
For agents
markdown · JSON · MCP: product_card(name="mozilla/gecko-dev")
Data as of 2026-08-30T08:39:29.467469+00:00 · Report a problem