Topics / #mozilla

Mozilla projects on GitHub

Mozilla ecosystem apps like Firefox and Thunderbird plus their tuning.

As of October 19, 2026, the most-starred Mozilla projects on GitHub are pdf.js (54K stars), desktop (45K stars) and thunderbird-android (14.1K stars). GitHub.Locker tracks 11 Mozilla repositories with 201.3K stars combined. The fastest-growing on October 18 was desktop, with +26 stars in a day.

11Projects

201.3KStars in total

+69Stars in a day

Browse in the catalog →github.com/topics/mozilla ↗

Hot right now

Most stars gained in a day · Oct 18

+26

desktop

zen-browser/desktop · ★ 45K

Zen is a desktop web browser built on top of Firefox, focused on making you more productive — its tagline is 'Welcome to a calmer internet'.

+18

firefox

mozilla-firefox/firefox · ★ 13.5K

Firefox, the fast and reliable web browser from the non-profit Mozilla organization. This is the official repository holding the browser's source code.

Meshroom

alicevision/Meshroom · ★ 13K

Meshroom is an open-source, node-based visual programming framework for building and running photogrammetry and 3D computer-vision pipelines, turning collections of 2D photos into 3D models, camera tracks, HDR panoramas, and more.

Betterfox

yokoffing/Betterfox · ★ 10.9K

Betterfox is a curated user.js file of about:config tweaks that makes Firefox more private, secure, and performant without installing third-party code.

The all-time top

11 projects · by stars

#1 · mozilla/pdf.js
pdf.js
PDF.js is a PDF viewer built with HTML5, community-driven and supported by Mozilla. Its goal is a general-purpose, web standards-based platform for parsing and rendering PDFs.
54K
#2 · zen-browser/desktop
desktop
Zen is a desktop web browser built on top of Firefox, focused on making you more productive — its tagline is 'Welcome to a calmer internet'.
45K
#3 · thunderbird/thunderbird-android
thunderbird-android
Thunderbird for Android is an open-source, privacy-focused email app that lets you manage multiple accounts from one place with a Unified Inbox option; it's built on the former K-9 Mail codebase.
14.1K

4
firefox
13.5Kmozilla-firefox/firefox · JavaScript
Firefox, the fast and reliable web browser from the non-profit Mozilla organization. This is the official repository holding the browser's source code.
5
send
13.2Kmozilla/send · FreeMarker
Firefox Send is a file sharing experiment from Mozilla (the makers of Firefox) that lets you send encrypted files to other users. Note that Mozilla shut the hosted service down and archived this repository.
6
firefox-ios
13.1Kmozilla-mobile/firefox-ios · Swift
Firefox for iOS — Mozilla's open-source web browser for iPhone and iPad. This one repository also contains Focus iOS, Mozilla's second iOS app.
7
Meshroom
13Kalicevision/Meshroom · Python
Meshroom is an open-source, node-based visual programming framework for building and running photogrammetry and 3D computer-vision pipelines, turning collections of 2D photos into 3D models, camera tracks, HDR panoramas, and more.
8
user.js
12.9Karkenfox/user.js · JavaScript
arkenfox user.js is a community-maintained Firefox configuration template that hardens privacy and security settings, aiming to reduce tracking and fingerprinting as much as possible while trying to keep the browser usable.
9
Betterfox
10.9Kyokoffing/Betterfox · JavaScript
Betterfox is a curated user.js file of about:config tweaks that makes Firefox more private, secure, and performant without installing third-party code.
10
rr
10.7Krr-debugger/rr · C++
rr is a lightweight tool that records the execution of an application — entire trees of processes and threads — and lets you replay and debug that recording.
11
Angelic-Angel
839sh1ma/Angelic-Angel · Rust
Angelic Angel is a Rust CLI tool that receives real-time Twitter/X push notifications by emulating a browser's Web Push client, connecting to Mozilla's AutoPush infrastructure, and forwarding the decrypted notification payloads to a webhook you control.