HackerReposA FIELD GUIDE TO OPEN SOURCE
ProSponsor the shelf♧ 0
← Back to top all-time
mozilla
gecko-dev
JavaScript2013–2025
mozilla / gecko-dev · Archived

gecko-dev

SUPERSEDED by https://github.com/mozilla-firefox/firefox. Read-only Git mirror of the Mercurial gecko repositories at https://hg.mozilla.org

Developer Tools
Explore on GitHubRead Hacker News discussions
69Distinct people
80Mentions
0Explicit recommenders
3.7KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

SUPERSEDED by https://github.com/mozilla-firefox/firefox. Read-only Git mirror of the Mercurial gecko repositories at https://hg.mozilla.org

GitHub

Where it is used

No documented product use was verified in the last source check.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

Mentioned in the same Hacker News threads. That is not proof they are substitutes.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 6:01:08 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year80 dated mentions

Observed mentions: 2013-11-26 19:11:13 UTC to 2025-05-15 22:12:15 UTC.

0510152013-01-01 00:00:00 UTC to 2014-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments20132014-01-01 00:00:00 UTC to 2015-01-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2015-01-01 00:00:00 UTC to 2016-01-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments2016-01-01 00:00:00 UTC to 2017-01-01 00:00:00 UTC (exclusive): 5 mentions; 0 submissions, 5 comments2017-01-01 00:00:00 UTC to 2018-01-01 00:00:00 UTC (exclusive): 8 mentions; 2 submissions, 6 comments2018-01-01 00:00:00 UTC to 2019-01-01 00:00:00 UTC (exclusive): 3 mentions; 0 submissions, 3 comments2019-01-01 00:00:00 UTC to 2020-01-01 00:00:00 UTC (exclusive): 9 mentions; 1 submissions, 8 comments20192020-01-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 4 mentions; 0 submissions, 4 comments2021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 17 mentions; 0 submissions, 17 comments2022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 14 mentions; 0 submissions, 14 comments2023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 9 mentions; 0 submissions, 9 comments2024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 3 mentions; 0 submissions, 3 comments2025-01-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 3 mentions; 0 submissions, 3 comments2025

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20132013-01-01 00:00:00 UTC2014-01-01 00:00:00 UTC101
20142014-01-01 00:00:00 UTC2015-01-01 00:00:00 UTC202
20152015-01-01 00:00:00 UTC2016-01-01 00:00:00 UTC211
20162016-01-01 00:00:00 UTC2017-01-01 00:00:00 UTC505
20172017-01-01 00:00:00 UTC2018-01-01 00:00:00 UTC826
20182018-01-01 00:00:00 UTC2019-01-01 00:00:00 UTC303
20192019-01-01 00:00:00 UTC2020-01-01 00:00:00 UTC918
20202020-01-01 00:00:00 UTC2021-01-01 00:00:00 UTC404
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC17017
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC14014
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC909
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC303
20252025-01-01 00:00:00 UTC2026-01-01 00:00:00 UTC303

From the project README

An excerpt from the repository, fetched Nov 13, 2026.

Read the project’s introduction
Firefox is a fast, reliable and private web browser from the non-profit Mozilla organization. Contributing To learn how to contribute to Firefox read the Firefox Contributors' Quick Reference document. We use bugzilla.mozilla.org as our issue tracker, please file bugs there. Resources Firefox Source Docs is our primary documentation repository Nightly development builds can be downloaded from Firefox Nightly page If you have a question about developing Firefox, and can't find the solution on Firefox Source Docs, you can try asking your question on Matrix at chat.mozilla.org in the Introduction channel.
Read the full README on GitHub

What Hacker News says

8 sources
kibwen·Sep 30, 2017
I don't know if there's any one location for all the Rust code; it may not make logical sense to put the MP4 parser written in Rust right next to the CSS engine, for example. I believe that https://github.com/mozilla/gecko-dev is a mirror of the repo in question, and so we can use Github's search function to find every file that it detects as being a Rust file: https://github.com/mozilla/gecko-dev/search?l=rust (which finds 3,274 Rust files, 6,701 C files, and 22,722 C++ files).
In It’s time to give Firefox another chance
jcelerier·Aug 17, 2017
From the code I saw of it firefox's code is still pretty much in the 90s mindset. I mean I just went to the github repo and opened a random file and look at this : https://github.com/mozilla/gecko-dev/blob/master/widget/Text... or this : https://github.com/mozilla/gecko-dev/blob/master/dom/base/At... raw pointers everywhere, macros, etc etc nsresult Attr::Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult, bool aPreallocateChildren) const { nsAutoString value; const_cast<Attr*>(this)->GetValue(value); ... makes my eyes bleed. the references to netscape everywhere are funny, too.
In When did software go off the rails?
acemarke·Jun 17, 2017
Great to see the Firefox Developer Tools team continue to make use of React and Redux as they rebuild things! They already used React+Redux to rebuild the Debugger (https://github.com/devtools-html/debugger.html , http://mozilla.github.io/devtools-docs/react.html ), and clearly it must be working well for them :) Definitely a couple nice examples of more complex "real-world" apps that go well past the TodoMVC level of detail. Looks like the source for the Network Monitor is at https://github.com/mozilla/gecko-dev/tree/master/devtools/cl... . (Also, will throw out a pointer to my React/Redux links list at https://github.com/markerikson/react-redux-links if anyone wants tutorials or info on best practices for using them.)
In Firefox Network Monitor Reloaded – Part 1
glandium·Feb 22, 2017
However, many prominent Open Source projects that don't use GitHub have mirrors on GitHub, and as long as you star them, they appear in your GitHub profile if you contributed to them using an email that is registered to your GitHub account. To give examples: - Git https://github.com/git/git, - Linux https://github.com/torvalds/linux, - LibreOffice https://github.com/LibreOffice/core, - Firefox https://github.com/mozilla/gecko-dev
In The Impact Github is Having on Your Software Career

MAKE YOURSELF AT HOME

A few shortcuts

/
Search the collection
?
Open this guide
Esc
Close dialogs and navigation

Your saved repositories and interests stay in this browser.