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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

Terminology: export do-not-translate and forbidden terms correctly Open

needs design

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

mozilla/pontoon#4544 · Opened Sep 19, 2026
Upload/download translations feature is broken in database projects (including Terminology) Open

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

mozilla/pontoon#4543 · Opened Sep 19, 2026
Establish the release process and cut v0.1.0 Open

enhancement

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

mozilla/markfluence#175 · Opened Sep 19, 2026
Playwright v1.61.0+ is needed for GHA compatibility Open

Bug

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

mozilla/bedrock#17389 · 1 comment · Opened Sep 18, 2026
fresh database container fails to come up Open

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

mozilla/code-review#3666 · Opened Sep 18, 2026
WebAssembly: Component Model Open

topic: WebAssembly venue: W3C

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

mozilla/standards-positions#1454 · 1 comment · Opened Sep 18, 2026
During Translation Chinese addresses from Japanese to English (or other languages, a country name Japan is appended to the address transaltion Open

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

mozilla/translations#1471 · Opened Sep 18, 2026
`SCCACHE_BASEDIRS` + Preporcessor cache mode hands out another checkout's object file Open

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

mozilla/sccache#2863 · 1 reaction · Opened Sep 18, 2026
[Task]: Deploy new devhub (pinguino) on dev Open

needs:info

Difficulty 4/5 3-5 days Newbie friendliness 25/100

mozilla/addons#16456 · Opened Sep 18, 2026
manifest.json not found Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/addons-linter#6202 · 1 comment · Opened Sep 18, 2026
Confirm new ubuntu-latest GH runner image is fine Open

Help wanted

Difficulty 3/5 1-2 days Newbie friendliness 65/100

mozilla/bedrock#17386 · 1 comment · Opened Sep 18, 2026
nvcc: `Missing "cubin" file output` for a PTX-only compute_90 gencode (0.18.0) Open

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

mozilla/sccache#2862 · Opened Sep 18, 2026
srgb-linear and display-p3-linear PredefinedColorSpace Open

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

mozilla/standards-positions#1453 · Opened Sep 18, 2026
[coverage]add enterprise channel tests dev/stage Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

mozilla/addons-release-tests#1234 · Opened Sep 18, 2026
Generic containers from non-UniFFI crates can't be described to a source-parsing bindgen Open

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

mozilla/uniffi-rs#3002 · Opened Sep 18, 2026
Remove deprecated New Tab addon version targeting configs Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

mozilla/experimenter#17358 · Opened Sep 17, 2026
Add version-stripped New Tab targeting configs Open

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

mozilla/experimenter#17357 · Opened Sep 17, 2026
Hackbot-client raising httpx exceptions to its callers Open

hackbot

Difficulty 3/5 1-2 days Newbie friendliness 48/100

mozilla/bugbug#6874 · Opened Sep 17, 2026
Intermittent failure in the `doesn't jump when moving selection` text layer integration test Open

intermittent test

Difficulty 4/5 3-5 days Newbie friendliness 52/100

mozilla/pdf.js#21978 · Opened Sep 17, 2026
The apply pending actions can double-post when having concurrent requests Open

hackbot

Difficulty 4/5 3-5 days Newbie friendliness 50/100

mozilla/bugbug#6873 · Opened Sep 17, 2026
Contributors: Add a search filter for self-reviewed strings Open

hours P4

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

mozilla/pontoon#4541 · 1 comment · Opened Sep 17, 2026
Inference engine crashes in TranslationModel::loadBackend with more than one worker thread Open

Difficulty 4/5 3-5 days Newbie friendliness 72/100

mozilla/translations#1470 · Opened Sep 17, 2026
Use mozconfig of the failed task Open

CI agents hackbot

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

mozilla/bugbug#6872 · Opened Sep 17, 2026
[Task]: Mention service account doc in ScannerWebhook admin Open

mozilla/addons#16455 · 1 assignee · Opened Sep 17, 2026
Build repair accuracy issues Open

CI agents hackbot

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

mozilla/bugbug#6871 · Opened Sep 17, 2026
Add ability to add comments via API Open

API days needs specification P2

Difficulty 4/5 3-5 days Newbie friendliness 52/100

mozilla/pontoon#4540 · Opened Sep 17, 2026
Replying to an unread message does not mark the original message as read Open

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

mozilla/releases-comm-central#121 · Opened Sep 17, 2026
Make the state machine 0-RTT aware Open

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

mozilla/happy-eyeballs#144 · 1 reaction · Opened Sep 17, 2026
Evaluate alternative solutions for terminology storage Open

days needs design needs specification P3

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

mozilla/pontoon#4539 · 3 comments · Opened Sep 17, 2026
Do-no-translate terms should not have a `TRANSLATE` link Open

good first issue hours P3

mozilla/pontoon#4538 · 2 comments · 1 assignee · Opened Sep 17, 2026
Avoid the CORS preflight on patch artifact reads Open

hackbot

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

mozilla/bugbug#6870 · Opened Sep 17, 2026
[Task]: Enable Persian locale on AMO Open

needs:info

Difficulty 3/5 1-2 days Newbie friendliness 50/100

mozilla/addons#16454 · Opened Sep 17, 2026
[Bug]: Combination of defaultZoomValue: page-height and scrollModeOnLoad: 3 = unable to scroll past page with keyboard Open

requires-feedback-from-ux-ui viewer

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

mozilla/pdf.js#21974 · Opened Sep 17, 2026
probe-scraper files duplicate bug for same metrics after version bump Open

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

mozilla/probe-scraper#1078 · Opened Sep 17, 2026
Remove the frontend Open

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

mozilla/code-review#3648 · 3 comments · Opened Sep 17, 2026
[Bug]: Deleted trailing pages return when downloading after restoring page order Open

editor

Difficulty 3/5 1-2 days Newbie friendliness 74/100

mozilla/pdf.js#21971 · Opened Sep 17, 2026
API documentation should be exposed in /docs Open

hours P3

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

mozilla/pontoon#4536 · Opened Sep 17, 2026
Remove the allowedNotificationOrigins PRESERVED_TARGETING_KEYS stopgap once the manifest records it Open

mozilla/experimenter#17342 · 1 assignee · Opened Sep 16, 2026
Map allowedNotificationOrigins to its BigQuery column in jexl_to_sql Open

mozilla/experimenter#17338 · 1 assignee · Opened Sep 16, 2026
Consider using a React component instead of diff2html for patch preview Open

good-first-bug hackbot

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

mozilla/bugbug#6868 · Opened Sep 16, 2026
Allow Hackbot UI users to opt-in to receiving an email when the job has completed Open

hackbot

mozilla/bugbug#6866 · 1 assignee · Opened Sep 16, 2026
Resolve uplift merge conflicts using a hackbot agent Open

hackbot

mozilla/bugbug#6865 · 1 assignee · Opened Sep 16, 2026
test_submit_a_new_version_for_addon - followup 2 - an attempt for AMO prod too Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

mozilla/addons-release-tests#1233 · Opened Sep 16, 2026
test_submit_a_new_version_for_addon - followup 1 - the part 2 - deletion of a version Open

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

mozilla/addons-release-tests#1232 · Opened Sep 16, 2026
Create API to extract information from uploaded file (terminology matches, other data) Open

API days P3

Difficulty 4/5 3-5 days Newbie friendliness 52/100

mozilla/pontoon#4534 · Opened Sep 16, 2026
Move coverall test coverage to bindgen-tests Open

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

mozilla/uniffi-rs#2997 · 1 comment · Opened Sep 16, 2026
Fluent strings with `SHORTDATE()` reimported and showing up broken as `{�}` Open

hours P2 regression

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

mozilla/pontoon#4533 · 5 comments · Opened Sep 16, 2026
`mls_core_tests` panics: depends on a file `mls-rs-core`'s crates.io package doesn't ship Open

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

mozilla/mls-platform-api#5 · Opened Sep 16, 2026
Warnings when opening /api/v2 Open

hours P4

Difficulty 3/5 1-2 days Newbie friendliness 48/100

mozilla/pontoon#4531 · Opened Sep 16, 2026
api/v2/pretranslate cannot be used from the UI Open

good first issue hours P4

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

mozilla/pontoon#4530 · 1 comment · Opened Sep 16, 2026

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