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mozilla

130 indexed repositories · View on GitHub

pdf.js
PDF Reader in JavaScript

JavaScript · 53903 stars
readability
A standalone version of the readability lib

JavaScript · 11451 stars
sccache
Sccache is a ccache-like tool. It is used as a compiler wrapper and avoids compilation when possible. Sccache has the capability to utili...

Rust · 7697 stars
uniffi-rs
a multi-language bindings generator for rust

Rust · 4974 stars
rhino
Rhino is an open-source implementation of JavaScript written entirely in Java

JavaScript · 4626 stars
source-map
Consume and generate source maps.

JavaScript · 3724 stars
multi-account-containers
Firefox Multi-Account Containers lets you keep parts of your online life separated into color-coded tabs that preserve your privacy. Cook...

JavaScript · 3146 stars
web-ext
A command line tool to help build, run, and test web extensions

JavaScript · 3138 stars
cbindgen
A project for generating C bindings from Rust code

Rust · 2950 stars
neqo
Neqo, the Mozilla Firefox implementation of QUIC in Rust

Rust · 2242 stars
fx-private-relay
Keep your email safe from hackers and trackers. Make an email alias with 1 click, and keep your address to yourself.

Python · 1781 stars
pontoon
Mozilla's Localization Platform

Python · 1667 stars
kitsune
Platform for Mozilla Support

Python · 1658 stars
grcov
Rust tool to collect and aggregate code coverage data for multiple source files

Rust · 1367 stars
bedrock
Making mozilla.org awesome, one pebble at a time

HTML · 1337 stars
policy-templates
Policy Templates for Firefox

Python · 1311 stars
rust-android-gradle

Kotlin · 1278 stars
blurts-server
Mozilla Monitor arms you with tools to keep your personal information safe. Find out what hackers already know about you and learn how to...

Fluent · 942 stars
standards-positions

HTML · 760 stars
fxa
Monorepo for Mozilla Accounts (formerly Firefox Accounts)

TypeScript · 685 stars
110 more repositories live on View on GitHub

Beginner friendly Everything

Open All

core and server never typecheck their own test files Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 78/100

mozilla/pilo#692 · Opened Sep 15, 2026
Decide on the strict tsconfig flags wxt 0.21 introduced (currently opted out) Open

extension

Difficulty 5/5 Over a week Newbie friendliness 38/100

mozilla/pilo#688 · 2 comments · Opened Sep 15, 2026
Xcode `%#@name@` placeholders are parsed differently by the JS and Python parsers Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

mozilla/moz-l10n#207 · Opened Sep 15, 2026
Cannot bump claude sdk to 2.1.251 to support Fable Open

hackbot

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mozilla/bugbug#6855 · 3 comments · Opened Sep 15, 2026
Auto inject the control trigger empty message for exposure events Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mozilla/experimenter#17303 · Opened Sep 15, 2026
Autowebcompat repro agent judging by the comments whether it's a webcompat issue and doesn't attempt to reproduce Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mozilla/bugbug#6853 · Opened Sep 15, 2026
polish the prose Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

mozilla/markfluence#165 · Opened Sep 15, 2026
[Bug]: `/GoToE` doesn’t work descendants other than children Open

core

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mozilla/pdf.js#21959 · Opened Sep 15, 2026
Panic on unlikely source code. Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

mozilla/cbindgen#1184 · 1 reaction · Opened Sep 14, 2026
Consider integrating Claude profiler Open

hackbot

mozilla/bugbug#6841 · 1 comment · 1 assignee · Opened Sep 14, 2026
Unify the sync and upload translation-import implementations Open

days P3

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mozilla/pontoon#4527 · Opened Sep 14, 2026
[Feature]: Default to custom page range when sidebar selection exists Open

feature requires-feedback-from-ux-ui viewer

Difficulty 3/5 1-2 days Newbie friendliness 68/100

mozilla/pdf.js#21958 · 1 comment · Opened Sep 14, 2026
Align built-in pretranslation with the pretranslation upload API Open

hours P3

Difficulty 4/5 3-5 days Newbie friendliness 38/100

mozilla/pontoon#4526 · 1 comment · Opened Sep 14, 2026
[Feature]: Hold shift to select a continuous range of pages in sidebar Open

feature requires-feedback-from-ux-ui viewer

Difficulty 3/5 1-2 days Newbie friendliness 62/100

mozilla/pdf.js#21957 · Opened Sep 14, 2026
Flaky test failure in jsonschema/validators.py Open

mozilla/bugbug#6840 · 1 assignee · Opened Sep 14, 2026
When autodiagnosis creates a testcase that requires server part, make sure it's included Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

mozilla/bugbug#6839 · Opened Sep 14, 2026
client.updateLanded can never fire for a page holding a macro Open

bug

Difficulty 5/5 Over a week Newbie friendliness 48/100

mozilla/markfluence#163 · Opened Sep 14, 2026
actionlog: compaction, and the attachment-* history lines nothing reads yet Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 25/100

mozilla/markfluence#162 · Opened Sep 14, 2026
HTTPStatusError: Client error '429 Unknown Error' for url 'https://phabricator.services.mozilla.com/api/differential.creatediff' Open

hackbot

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mozilla/bugbug#6837 · Opened Sep 14, 2026
AMO returns an empty HTTP 406 from privately operated VPN server 185.117.72.109 Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

mozilla/addons#16452 · 1 comment · Opened Sep 14, 2026
LTO links lose the jobserver Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

mozilla/sccache#2855 · 7 comments · Opened Sep 14, 2026
[bot] Remove obsolete l10n strings and ftl files Open

Frontend L10N

Difficulty 4/5 3-5 days Newbie friendliness 55/100

mozilla/bedrock#17376 · Opened Sep 14, 2026
Gradle build crashes on macOS 14-15 Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mozilla/rhino#2491 · 15 comments · Opened Sep 14, 2026
Intermittent failure in the `should keep an ink annotation on a pasted and moved page` reorganize pages integration test Open

intermittent test

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mozilla/pdf.js#21954 · Opened Sep 13, 2026
Show a completion status when a Review Helper re-review has no findings Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

mozilla/bugbug#6832 · Opened Sep 13, 2026
Replae `Field(default=None)` with reguler default value assignment Open

good-first-bug

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

mozilla/bugbug#6831 · Opened Sep 13, 2026
Decide whether frontmatter.UpdateListField goes, now that nothing calls it Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mozilla/markfluence#157 · Opened Sep 13, 2026
Accesskey should be included when matching Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mozilla/pontoon#4522 · 1 comment · Opened Sep 13, 2026
markfluence check-project: validate what only the whole project reveals Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 45/100

mozilla/markfluence#152 · Opened Sep 13, 2026
markfluence status: show the local page tree and whether Confluence has moved on Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

mozilla/markfluence#148 · 4 comments · Opened Sep 12, 2026
uniffi_parse_rs: dealing with remote custom type paths Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

mozilla/uniffi-rs#2994 · 1 comment · Opened Sep 12, 2026
Targeting criteria request Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

mozilla/experimenter#17273 · Opened Sep 11, 2026
Update Browser Support Matrix Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

mozilla/protocol#1145 · Opened Sep 11, 2026
Evaluate Hy-MT2 Open

LLM

mozilla/translations#1467 · 3 reactions · 1 assignee · Opened Sep 11, 2026
Convert Hackbot actions to be classes instead of dicts Open

hackbot

Difficulty 4/5 3-5 days Newbie friendliness 42/100

mozilla/bugbug#6829 · 1 comment · Opened Sep 11, 2026
Buggy translation of time values from Ukrainian Open

quality

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mozilla/translations#1466 · Opened Sep 11, 2026
Start cloning as soon as possible in bot tasks Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

mozilla/code-review#3640 · Opened Sep 11, 2026
We are spending a lot of time computing issue hashes Open

mozilla/code-review#3638 · 1 assignee · Opened Sep 11, 2026
QPACK encoder computes `MaxEntries` from locally-clamped capacity Open

Difficulty 3/5 1-2 days Newbie friendliness 70/100

mozilla/neqo#3973 · Opened Sep 11, 2026
parse_rustc_z_ls misparses deps without -HASH suffix → E0463 on dist workers Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

mozilla/sccache#2846 · Opened Sep 11, 2026
After Update new version page is not correct language Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mozilla/translations#1465 · Opened Sep 11, 2026
seekingalpha.com - Reverts back to normal when enabling reader mode Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

mozilla/readability#1031 · Opened Sep 11, 2026
HKDF implementation is poorly tested Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

mozilla/nss-rs#216 · Opened Sep 11, 2026
[Rollout UI] Documentation link title errors are hidden for every link, not just newly added ones Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

mozilla/experimenter#17258 · Opened Sep 10, 2026
Notify a developer about the proposed patch in test-repair Open

CI agents hackbot

mozilla/bugbug#6823 · 1 assignee · Opened Sep 10, 2026
Hackbot action constants are duplicated between runtime and API Open

hackbot

Difficulty 3/5 1-2 days Newbie friendliness 55/100

mozilla/bugbug#6822 · Opened Sep 10, 2026
Include tacher's back-translation data in distillation Open

experiment

mozilla/translations#1463 · 1 comment · 1 assignee · Opened Sep 10, 2026
Teacher-student gap difference by direction Open

quality

mozilla/translations#1462 · 1 assignee · Opened Sep 10, 2026
Downgrade `uv = discouraged` requests to CTAP1/U2F to avoid user verification Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 48/100

mozilla/authenticator-rs#376 · Opened Sep 10, 2026
Switch in-repo action refs to $/ self-repository syntax once actionlint supports it Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

mozilla/blender#157 · Opened Sep 9, 2026

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