Topics / #firefox-extension

Firefox-extension projects on GitHub

Extensions and add-ons developed for the Firefox browser.

As of , the most-starred Firefox-extension projects on GitHub are uBlock (68.6K stars), memos (63.9K stars) and markdown-here (60.3K stars). GitHub.Locker tracks 58 Firefox-extension repositories with 988.3K stars combined. The fastest-growing on October 17 was github-chinese, with +127 stars in a day.

58Projects
988.3KStars in total
+616Stars in a day
Browse in the catalog →github.com/topics/firefox-extension ↗

Hot right now

Most stars gained in a day · Oct 17

+127

github-chinese

maboloshi/github-chinese · ★ 35.8K

A userscript that translates the entire GitHub interface (menus, titles, buttons, etc.) into Chinese, built on top of the earlier 52cik/github-hans project.

+67

FluxDown

zerx-lab/FluxDown · ★ 4.6K

FluxDown is a free, open-source download manager built in Rust that handles HTTP/HTTPS, FTP, BitTorrent, eD2K and HLS/DASH streaming downloads, positioned as a free IDM alternative.

+55

Motrix

agalwood/Motrix · ★ 57K

Motrix is a free, full-featured download manager for HTTP, FTP, BitTorrent, and magnet links, built as a desktop app with an optional headless server mode.

+33

uBlock

gorhill/uBlock · ★ 68.6K

uBlock Origin (uBO) is a free, open-source browser extension that blocks ads, trackers, coin miners, popups, anti-blockers, and malware sites in Chromium and Firefox.

The all-time top

58 projects · by stars

  1. #1 · gorhill/uBlock

    uBlock

    uBlock Origin (uBO) is a free, open-source browser extension that blocks ads, trackers, coin miners, popups, anti-blockers, and malware sites in Chromium and Firefox.

    68.6K
  2. #2 · usememos/memos

    memos

    Memos is an open-source, self-hosted app for capturing short-form notes—daily notes, links, work logs, and snippets—into a chronological Markdown timeline you can revisit by search, tag, or date.

    63.9K
  3. #3 · adam-p/markdown-here

    markdown-here

    Markdown Here is a browser extension for Chrome, Firefox, Opera, and Thunderbird that lets you write an email in Markdown and then render it into styled HTML right in the compose box before sending.

    60.3K
  1. 4

    Motrix

    57Kagalwood/Motrix · TypeScript

    Motrix is a free, full-featured download manager for HTTP, FTP, BitTorrent, and magnet links, built as a desktop app with an optional headless server mode.

  2. 5

    joplin

    56.8Klaurent22/joplin · TypeScript

    Joplin is an open source note taking and to-do application, built to handle a large number of notes organised into notebooks.

  3. 6

    github-chinese

    35.8Kmaboloshi/github-chinese · JavaScript

    A userscript that translates the entire GitHub interface (menus, titles, buttons, etc.) into Chinese, built on top of the earlier 52cik/github-hans project.

  4. 7

    clipboard.js

    34.1Kzenorocha/clipboard.js · JavaScript

    clipboard.js is a tiny JavaScript library that lets you copy text to the clipboard with a button click, without Flash or any heavy framework.

  5. 8

    refined-github

    32.3Krefined-github/refined-github · TypeScript

    Refined GitHub is a browser extension that cleans up GitHub's interface and bolts on dozens of small quality-of-life features, from sticky sidebars to better diff and comment tools.

  6. 9

    lighthouse

    30.9KGoogleChrome/lighthouse · JavaScript

    Lighthouse is an open-source web auditing tool from Google: it runs a page through automated checks, collects modern performance metrics and best-practice insights, and turns them into a scored report.

  7. 10

    karakeep

    29.7Kkarakeep-app/karakeep · TypeScript

    Karakeep (formerly Hoarder) is a self-hostable bookmark-everything app: save links, notes, images and PDFs, and it auto-fetches link details, tags everything with an LLM and gives you full-text and semantic search over all of it.

  8. 11

    repomix

    28.9Kyamadashy/repomix · TypeScript

    Repomix packs an entire repository into a single AI-friendly file you can feed to LLMs like Claude, ChatGPT, DeepSeek or Gemini — for code review, refactoring, docs or tests.

  9. 12

    vimium

    27.1Kphilc/vimium · JavaScript

    Vimium is a browser extension that adds Vim-style keyboard navigation and control to the web, letting you browse without reaching for the mouse.

  10. 13

    devtools-v6

    24.7Kvuejs/devtools-v6 · TypeScript

    This is Vue Devtools - a browser devtools extension for debugging Vue.js applications. The devtools-v6 repo is its version 6 codebase.

  11. 14

    SingleFile

    22.6Kgildas-lormeau/SingleFile · JavaScript

    SingleFile is a browser extension that saves a complete, faithful copy of any web page into a single HTML file you can keep and reopen later.

  12. 15

    SwitchyOmega

    22.6KFelisCatus/SwitchyOmega · CoffeeScript

    SwitchyOmega is a browser extension for managing and quickly switching between multiple proxy configurations.

  13. 16

    cat-catch

    22.3Kxifangczy/cat-catch · JavaScript

    cat-catch ('Cat Catch') is a browser extension that sniffs out the resources a page loads, filters them into a list, and helps you download media such as m3u8 video streams.

  14. 17

    automa

    21.7KAutomaApp/automa · Vue

    Automa is a browser extension that automates your browser by connecting blocks into workflows — auto-fill forms, take screenshots, repeat tedious tasks, or scrape website data.

  15. 18

    voyager

    20.4Kvoyager-crew/voyager · TypeScript

    Voyager is a free, open-source browser extension that enhances AI chat sites — Gemini, Google AI Studio, Claude, ChatGPT and DeepSeek — with folders, timelines, export and other tweaks, plus a prompt manager that works on any website.

  16. 19

    Thinking-Claude

    17Krichards199999/Thinking-Claude · TypeScript

    Thinking Claude is a project with two parts: a 'Thinking Protocol' - custom instructions that make Claude reason more deeply and systematically before answering - and a browser extension that renders that thinking process as neat, collapsible sections in the Claude.ai chat UI.

  17. 20

    omnivore

    16.3Komnivore-app/omnivore · TypeScript

    Omnivore is an open source read-it-later app: you save articles, PDFs and newsletter issues into a personal reading queue, then read them with highlighting, notes, labels and search.

  18. 21

    gitingest

    15.9Kcoderamp-labs/gitingest · Python

    Gitingest turns any Git repository into a prompt-friendly text digest for LLMs. You can also just swap 'hub' for 'ingest' in a GitHub URL (e.g. github.com -> gitingest.com) to get the digest instantly.

  19. 22

    redux-devtools

    14.4Kreduxjs/redux-devtools · TypeScript

    Redux DevTools is a developer tools suite for Redux (or any architecture that handles state changes) that lets you inspect every dispatched action, replay actions, and hot reload your app's state.

  20. 23

    clients

    14Kbitwarden/clients · TypeScript

    This is the monorepo for Bitwarden's client applications — the web vault, browser extension, Electron desktop app, and CLI — everything except the mobile apps.

  21. 24

    SponsorBlock

    13.9Kajayyy/SponsorBlock · TypeScript

    SponsorBlock is an open-source, crowdsourced browser extension that skips sponsor segments in YouTube videos. Users submit the timestamps where a sponsor plug happens, and the extension automatically skips those segments for everyone else.

  22. 25

    return-youtube-dislike

    13.8KAnarios/return-youtube-dislike · JavaScript

    Return YouTube Dislike is an open-source browser extension that brings back the dislike count on YouTube videos after Google hid it from the API.

  23. 26

    git-history

    13.7Kpomber/git-history · JavaScript

    Git History is a free tool for quickly browsing the history of any file in a git repository — you see how the file evolved, commit by commit.

  24. 27

    redux-devtools-extension

    13.4Kzalmoxisus/redux-devtools-extension · JavaScript

    A browser extension for Redux apps: once you point it at your store, you get DevTools for watching actions and state while you develop.

  25. 28

    ext-saladict

    13.4Kcrimx/ext-saladict · TypeScript

    Saladict (沙拉查词) is a browser extension for Chrome and Firefox that pops up a dictionary when you select a word, translates whole pages, and lets you build a personal word notebook, including inside PDFs.

  26. 29

    metamask-extension

    13.2KMetaMask/metamask-extension · TypeScript

    MetaMask is a browser extension that lets you browse and interact with Ethereum blockchain websites (dapps) directly from your browser, acting as a crypto wallet and Web3 gateway.

  27. 30

    kiss-translator

    12.9Kfishjar/kiss-translator · JavaScript

    KISS Translator is an open-source side-by-side (bilingual) web translator, shipped both as a full browser extension and as a Greasemonkey/Tampermonkey userscript, that translates web pages, input boxes, selected text, and YouTube subtitles.

  28. 31

    listen1_chrome_extension

    12.1Klisten1/listen1_chrome_extension · JavaScript

    Listen 1 is a browser extension that pulls free music streams from major Chinese platforms (NetEase Cloud Music, QQ Music, Kugou, Kuwo, Bilibili, Migu, Qianqian) into one unified player, so you do not have to jump between sites looking for a copy of a song that is not blocked.

  29. 32

    TwitchAdSolutions

    11.3Kpixeltris/TwitchAdSolutions · JavaScript

    A collection of methods for blocking ads on Twitch.tv, including proxy recommendations, uBlock Origin filters, and standalone userscripts.

  30. 33

    linkding

    11.3Ksissbruecker/linkding · Python

    Linkding is a self-hosted bookmark manager built to be minimal, fast, and quick to set up with Docker, so you keep full control of your own bookmarks instead of relying on a third-party service.

  31. 34

    rayburst

    11.1KAnInsomniacy/rayburst · TypeScript

    Motrix Next is a full-featured open-source download manager — a ground-up rewrite of the popular Motrix app, now built on Tauri 2 (Rust) and Vue 3 instead of Electron, supporting HTTP, BitTorrent, ED2K, and Magnet downloads.

  32. 35

    nopecha-extension

    11KNopeCHALLC/nopecha-extension

    NopeCHA is a browser extension that automatically detects and solves CAPTCHAs on any page, powered by multimodal AI running through the NopeCHA API platform.

  33. 36

    react-devtools

    11Kfacebook/react-devtools

    React DevTools is a browser extension that lets you inspect the hierarchy of React components directly inside the Chrome and Firefox Developer Tools panels.

  34. 37

    FileCentipede

    10.9Kfilecxx/FileCentipede · C++

    FileCentipede is an all-in-one internet upload/download manager that works as a BitTorrent client, WebDAV client, FTP client, and SSH client, with browser integration for grabbing audio/video from web pages.

  35. 38

    chatGPTBox

    10.8KChatGPTBox-dev/chatGPTBox · JavaScript

    ChatGPTBox is a browser extension that integrates ChatGPT and other AI chat models deeply into your browser, letting you pop up a chat dialog on any page, summarize pages, and run AI tools through a selection menu and site integrations.

  36. 39

    read-frog

    10.1Kmengxi-ream/read-frog · TypeScript

    Read Frog is an open-source browser extension that provides AI-powered translation and language learning while you browse: it translates web pages, article subtitles, and selected text, and turns what you read into flashcards for study.

  37. 40

    FluentRead

    8.5KFluentRead/FluentRead · TypeScript

    FluentRead is an open-source browser extension that shows translations alongside the original webpage, with selection translation, an AI reading assistant, image and document translation, and bilingual video subtitles.

  38. 41

    Infographic

    7Kantvis/Infographic · TypeScript

    AntV Infographic is a declarative framework for generating and rendering infographics, built so AI can turn text descriptions into polished visual infographics rendered as SVG.

  39. 42

    summarize

    6.7Ksteipete/summarize · TypeScript

    Summarize is a CLI tool and browser extension that extracts clean text and generates summaries from web pages, files, YouTube videos, podcasts, and other audio or video.

  40. 43

    hister

    6.1Kasciimoo/hister · Go

    Hister is a private, self-hosted search engine that fully indexes the pages you visit and the files you keep, so you can search their content later from a web interface, terminal, or an AI assistant via MCP.

  41. 44

    Telegram-Media-Downloader

    6.1KNeet-Nestor/Telegram-Media-Downloader · JavaScript

    A userscript that restores the download button for images, GIFs, audios and videos on Telegram Web when a chat or channel has disabled content saving.

  42. 45

    video_vip

    5.5K88lin/video_vip · JavaScript

    A userscript that lets you watch VIP content on major Chinese video sites for free by routing playback through multiple third-party parsing interfaces that bypass the membership paywall and strip ads.

  43. 46

    FluxDown

    4.6Kzerx-lab/FluxDown · Rust

    FluxDown is a free, open-source download manager built in Rust that handles HTTP/HTTPS, FTP, BitTorrent, eD2K and HLS/DASH streaming downloads, positioned as a free IDM alternative.

  44. 47

    Surge

    3.6KSurgeDM/Surge · Go

    Surge is a terminal-based (TUI) download manager written in Go for power users who want fast, keyboard-driven, multi-connection downloads.

  45. 48

    edgeever

    2.3Ktianma-if/edgeever · TypeScript

    EdgeEver is an open-source, AI-native knowledge base and notes app built as a portable Evernote alternative, with a classic three-pane layout and native AI/MCP agent integration.

  46. 49

    maxurl

    1.6Kqsniyg/maxurl · JavaScript

    Image Max URL (maxurl) is a tool that finds larger or original versions of images and videos, usually by rewriting their URLs. It has built-in support for over 10,000 specific sites plus generic engines like WordPress and MediaWiki.

  47. 50

    hydra

    1.1Kja7ad/hydra · Rust

    Hydra (HDM) is a fast, resilient download manager and accelerator that splits files across multiple connections and mirror sources, with a wget/curl-compatible CLI and a cross-platform desktop GUI.

  48. 51

    javranking-extension

    907aizhimou/javranking-extension · TypeScript

    A browser extension that reads the JAV video code on the page you're currently viewing — only after you click its toolbar icon — and shows matching cover art and JavRanking leaderboard info for that title.

  49. 52

    Youtube-Pro-Plus

    652Archimetrix/Youtube-Pro-Plus · JavaScript

    Youtube Pro+ is a browser extension that overhauls the YouTube interface and playback with a 'Liquid Glass' theme and a big bundle of extra features like speed boosting, SponsorBlock, auto-resume history, screenshots and watch parties.

  50. 53

    desktop_gifs

    487rayytor/desktop_gifs · JavaScript

    Desktop GIFs is a browser extension that adds a GIF button next to the emoji button in YouTube's comment box, letting you attach a Tenor GIF to a comment or reply from a desktop browser, something YouTube's own desktop site has no button for.

  51. 54

    Instagram-Downloader

    441hoaianle/Instagram-Downloader · JavaScript

    A Chrome extension that downloads photos and videos from Instagram posts, TV, reels, stories, and highlights directly from the page you're viewing.

  52. 55

    Card-master-browser-extension-public

    432LYiHub/Card-master-browser-extension-public · TypeScript

    Card Master is a browser extension that turns various user scripts and browser capabilities (ad hiding, dark mode, video speed control, media grabbing, gamepad control) into playable, game-like 'cards', and can even generate brand-new card plugins with AI.

  53. 56

    Ketch

    406linroid/Ketch · Kotlin

    Ketch is a fast, open-source download manager that works across macOS, Windows, Linux, Android, iOS, web and the command line, letting you pair your devices and control downloads from any of them.

  54. 57

    streamfirefly

    286rumoii/streamfirefly · JavaScript

    StreamFirefly (流萤) is a local-first tool for finding and downloading media on web pages. A browser extension detects videos, audio, images and HLS/DASH manifests, while a Rust-based Windows native helper handles the actual downloading, queuing, resuming and FFmpeg merging; tasks and settings stay on your machine.

  55. 58

    Tailtab

    216Stocist/Tailtab · Go

    Tailtab gives every browser profile its own Tailscale node, so different profiles (or even different Tailscale/Headscale accounts) can sit on completely separate tailnets at the same time, while the rest of the machine is untouched.

Often tagged together