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mozilla

152 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
cargo-vet
supply-chain security for Rust

Rust · 991 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
132 more repositories live on View on GitHub

Beginner friendly Everything

Open All

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
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
Implement Error for BorrowError and BorrowMutError Open

Difficulty 1/5 Under an hour Newbie friendliness 78/100

mozilla/atomic_refcell#38 · Opened Sep 16, 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
Update Browser Support Matrix Open

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

mozilla/protocol#1145 · 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
[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
Remove Rust version divergence when Rust 1.100 hits stable Open

Difficulty 1/5 Under an hour Newbie friendliness 90/100

mozilla/grcov#1525 · Opened Sep 9, 2026
[Task]: delete extract_host_permissions command Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

mozilla/addons#16445 · Opened Sep 8, 2026
Fail CI on feature manifest errors Open

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

mozilla/experimenter#17133 · 1 comment · Opened Sep 3, 2026
STMO Link for Popsize query returns individual client rows instead of counts Open

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

mozilla/experimenter#17119 · Opened Sep 2, 2026
WebTransport: require peer `reset_stream_at` once widely deployed Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

mozilla/neqo#3917 · Opened Sep 1, 2026
Add security rating to filters Open

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

mozilla/bugdash#58 · Opened Aug 31, 2026
cargo-vet install required yanked crates Open

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

mozilla/cargo-vet#696 · 1 comment · 1 reaction · Opened Aug 27, 2026
IP:port shows without colon in the menu Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

mozilla/multi-account-containers#2933 · Opened Aug 27, 2026
setup-target config reads ignore the legacy blender: wrapper Open

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

mozilla/blender#146 · Opened Aug 24, 2026
ghac: cache writes are dropped on HTTP 429 because GHACache::build installs no RetryLayer Open

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

mozilla/sccache#2821 · 1 comment · 1 reaction · Opened Aug 23, 2026
Use users’ default locale for Search locale selection Open

hours P3

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

mozilla/pontoon#4442 · 7 comments · Opened Aug 22, 2026
Make the hard-coded 60s cache read timeout configurable Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

mozilla/sccache#2820 · Opened Aug 21, 2026
JSDOMParser: Element is missing a lang accessor Open

Difficulty 1/5 Under an hour Newbie friendliness 76/100

mozilla/readability#1026 · Opened Aug 21, 2026
P1 - HTML result artifacts are committed Open

Difficulty 1/5 1-3 hours Newbie friendliness 86/100

mozilla/addons-release-tests#1220 · Opened Aug 18, 2026
Phase 0 - Testing with different reporting Open

Difficulty 2/5 Half a day Newbie friendliness 68/100

mozilla/addons-release-tests#1215 · Opened Aug 18, 2026
Centralize the duplicated reasoning/ref tool-parameter descriptions Open

hackbot

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

mozilla/bugbug#6632 · Opened Aug 18, 2026
Give each action handler its own instance instead of a shared singleton Open

hackbot

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

mozilla/bugbug#6625 · Opened Aug 18, 2026
TypeError: Parser must be a string or character stream, not NoneType Open

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

mozilla/bugbot#2980 · Opened Aug 14, 2026
AttributeError: 'list' object has no attribute 'values' Open

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

mozilla/bugbot#2979 · Opened Aug 14, 2026
cargo vet fails with cargo's -Zbindeps feature Open

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

mozilla/cargo-vet#693 · Opened Aug 13, 2026
sccache-dist: Docker builder hangs indefinitely — `docker cp -` is never sent EOF Open

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

mozilla/sccache#2805 · Opened Aug 12, 2026
ConfigLoader() clobbers intended default value for `experiments_column_type` Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

mozilla/mozanalysis#585 · Opened Aug 12, 2026
coverage_devhub_tests Open

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

mozilla/addons-release-tests#1213 · Opened Aug 12, 2026
Sort selected features to top of list in feature config selector on branch page Open

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

mozilla/experimenter#16723 · Opened Aug 11, 2026
`CPATH` var not considered when computing cache key, causing include paths to not be searched after it becomes unset Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

mozilla/sccache#2798 · 1 comment · Opened Aug 6, 2026
Report and Log nightly version used in `test-plan-generator` agent for debugging purposes. Open

hackbot

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

mozilla/bugbug#6507 · Opened Aug 4, 2026
Send a descriptive User-Agent from the shared Phabricator/Bugzilla clients Open

hackbot

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

mozilla/bugbug#6460 · Opened Aug 3, 2026
Move checkout_revision() onto HackbotContext or fold it into prepare_repo() Open

hackbot

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

mozilla/bugbug#6453 · Opened Aug 3, 2026
Development server missing some schemas with version=None Open

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

mozilla/experimenter#16586 · Opened Jul 31, 2026
Rust 1.97.0+ no longer suppresses linker output, causing noisy build logs Open

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

mozilla/rust-android-gradle#174 · Opened Jul 30, 2026
Use UV dependency groups Open

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

mozilla/experimenter#16541 · Opened Jul 28, 2026
[Feature]: Document the `search=` "Option after the #" Open

other

Difficulty 1/5 Under an hour Newbie friendliness 85/100

mozilla/pdf.js#21645 · 1 comment · Opened Jul 27, 2026
Redaction placeholder `[hidden]` is confusable with ARIA hidden semantics; agent misreads it as a site defect Open

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

mozilla/pilo#613 · Opened Jul 24, 2026
wasm-mappings fail to build with Rust 1.96+ Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

mozilla/source-map#530 · Opened Jul 22, 2026
The Proxy Learn More link doesn't work Open

bug

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

mozilla/multi-account-containers#2919 · Opened Jul 19, 2026
Mozilla logo in the footer is not visible on localized website versions Open

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

mozilla/blurts-server#6768 · Opened Jul 17, 2026
Use TestCase.assertDictEqual when comparing DRF serializer errors Open

Maintenance Task

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

mozilla/experimenter#16198 · Opened Jul 3, 2026
DecimalField max_value and min_value should be Decimal or int Open

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

mozilla/experimenter#16195 · Opened Jul 3, 2026
(staticfiles.W004) The directory '/experimenter/experimenter/legacy/legacy-ui/assets' in the STATICFILES_DIRS setting does not exist. Open

Difficulty 2/5 1-3 hours Newbie friendliness 66/100

mozilla/experimenter#16194 · Opened Jul 3, 2026
[Task]: Remove redundant `boilerplate_text` support from reviewer tools Open

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

mozilla/addons#16309 · Opened Jul 2, 2026
Can't select test path Open

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

mozilla/aretestsfastyet#3 · Opened Jun 29, 2026
Copy mach test command button should have the `--enable-a11y-checks` flag when needed Open

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

mozilla/aretestsfastyet#2 · Opened Jun 29, 2026

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