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Top 23 Firefox Open-Source Projects
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Project mention: Migrating from Astro 5 to Astro 6: A Real-World Breakdown π | dev.to | 2026-05-03
After the upgrades, TypeScript started rejecting Buffer as a Response body. This wasn't a runtime issue β Puppeteer still returns a Buffer β but astro check (and therefore npm run build) flags it.
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Playwright
Playwright is a framework for Web Testing and Automation. It allows testing Chromium, Firefox and WebKit with a single API.
Project mention: Building a self-hosted browser scraping service (is it more hassle than its worth?) | dev.to | 2026-05-27The foundational decision is understanding that Playwright is a control library, not a browser. It speaks Chrome DevTools Protocol (CDP) to whatever binary you point it at, and the binary is entirely separate from the library. This distinction is what makes a remote browser service possible.
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And in case you do need them, itβs a simple keyboard shortcut to load them (= Relax mode).
[1] https://github.com/gorhill/uBlock/wiki/Blocking-mode:-medium...
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mkcert
A simple zero-config tool to make locally trusted development certificates with any names you'd like.
On install it generates an ECDSA P-256 root CA at ~/.mkdev/ca/ (private key written 0o400, owner-read only) and installs it into the OS-native trust store. The trust-store integration β Keychain via security on macOS, the CA-bundle dirs plus update-ca-* on Linux, the ROOT store via crypt32.dll on Windows β is adapted from mkcert (BSD-3, credited in LICENSE-MKCERT). That layer is the genuinely OS-specific part and reusing it saved a lot of pain.
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Project mention: dao-browser VS desktop - a user suggested alternative | libhunt.com/r/dao-browser | 2026-05-24
zen is also a browser, but dao is build for chromium kernel
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ArchiveBox
π Open source self-hosted web archiving. Takes URLs/browser history/bookmarks/Pocket/Pinboard/etc., saves HTML, JS, PDFs, media, and more...
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Since 2019, I SingleFile (https://github.com/gildas-lormeau/SingleFile) potentially ephemeral pages into a folder and pick stuff out when I feel like it, pruning entries that have lost relevance or appeal. Browsers' Print to PDF feature would work too. The "system" is exactly as reliable as its operator. No reminders included, but I don't want my computer beeping at me (and maybe you don't want really want that either).
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Project mention: I Built a Tool That Lets You Solve CAPTCHAs Once and Automate Forever | dev.to | 2026-03-13
SessionKeeper is built on Playwright and uses its storage_state persistence:
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HackBrowserData
Extract and decrypt browser data, supporting multiple data types, runnable on various operating systems (macOS, Windows, Linux).
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Project mention: Return YouTube Dislike" Chrome Extension Injecting Ads | news.ycombinator.com | 2025-10-26
Discussion here also...
https://github.com/Anarios/return-youtube-dislike/issues/123...
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Project mention: If you're an LLM, please read this β Anna's Blog | news.ycombinator.com | 2026-05-22
You might be interested in the SponsorBlock[1] browser extension for Firefox and Chromium based browsers. It deals with this issue, and is open source.
[1] https://github.com/ajayyy/SponsorBlock
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browserless
Deploy headless browsers in Docker. Run on our cloud or bring your own. Free for non-commercial uses.
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metamask-extension
:globe_with_meridians: :electric_plug: The MetaMask browser extension enables browsing Ethereum blockchain enabled websites
Project mention: ChuvAKA β Encrypted P2P Identityless chat and stream webapp | news.ycombinator.com | 2026-04-08 -
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It's a shame Firefox on iOS has failed/refused to support third-party content filters [1] since 2019. Just because they can't bring Gecko doesn't mean they shouldn't try to gain mindshare for the Mozilla Firefox brand on one of the biggest platforms, yet they refuse to put in the resources.
1: https://github.com/mozilla-mobile/firefox-ios/issues/5198
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user.js
Firefox privacy, security and anti-tracking: a comprehensive user.js template for configuration and hardening
unfortunately, it's close to useless in 2026. i'll take an excerpt from arkenfox's repo as to why:
> Replacing some version specific scripts on CDNs with local versions is not a comprehensive solution and is a form of enumerating badness. While it may work with some scripts that are included it doesnβt help with most other third party connections.
> CDN extensions don't really improve privacy as far as sharing your IP address is concerned and their usage is fingerprintable as this Tor Project developer points out. They are the wrong tool for the job and are not a substitute for a good VPN or Tor Browser. Its worth noting the resources for Decentraleyes are over six years out of date and would not likely be used anyway
https://github.com/arkenfox/user.js/wiki/4.1-Extensions
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Project mention: Making Firefox's right-click not suck with about:config | news.ycombinator.com | 2026-03-04
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https://github.com/Floorp-Projects/Floorp-core [a submodule of their main repo] is noticeably missing any licensing information
I went there to find out how they're tracking upstream releases, because that's my major heartburn about any fork of one of the biggest attack targets on a personal computer. Since 12.0.14 doesn't tell me anything about what version of Firefox it's built against, I guess https://github.com/Floorp-Projects/Floorp/blob/v12.0.14/brow... is the best one can do and since it says 128.anything and the current production release is 140.0.4 I got my answer
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2. Self-hosted solutions (Floccus + Nextcloud/WebDAV) If you run your own Nextcloud or WebDAV server, Floccus can sync bookmarks across browsers using your own infrastructure. Great for privacy purists, but requires server maintenance.
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Firefox discussion
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Zen Browser
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A note from our sponsor - SaaSHub
www.saashub.com | 7 Jun 2026
Index
What are some of the best open-source Firefox projects? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | puppeteer | 94,449 |
| 2 | Playwright | 90,281 |
| 3 | uBlock | 65,235 |
| 4 | mkcert | 58,813 |
| 5 | desktop | 42,526 |
| 6 | ArchiveBox | 27,614 |
| 7 | octotree | 23,192 |
| 8 | SingleFile | 21,419 |
| 9 | cat-catch | 19,961 |
| 10 | playwright-python | 14,718 |
| 11 | HackBrowserData | 14,171 |
| 12 | return-youtube-dislike | 13,614 |
| 13 | SponsorBlock | 13,293 |
| 14 | browserless | 13,289 |
| 15 | metamask-extension | 13,137 |
| 16 | clients | 12,984 |
| 17 | firefox-ios | 12,966 |
| 18 | user.js | 12,590 |
| 19 | Betterfox | 10,480 |
| 20 | min | 9,005 |
| 21 | camoufox | 8,990 |
| 22 | Floorp | 8,179 |
| 23 | floccus | 8,099 |
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